id stringlengths 12 12 | format stringclasses 2 values | title_ko stringlengths 0 811 ⌀ | title_en stringlengths 0 1.26k ⌀ | journal dict | authors listlengths 0 15 | abstract_ko stringlengths 0 4k ⌀ | abstract_en stringclasses 100 values | keywords stringclasses 157 values | citation_count stringclasses 5 values | doi stringlengths 0 127 ⌀ | url stringclasses 101 values | file_source stringlengths 23 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART001715658 | oai_dc | 벤더형 고응답 압전밸브의 주파수 특성에 관한 연구 | A Study on Frequency Characteristics of a Bender Type High-Speed Piezoelectric Pneumatic Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤소남(한국기계연구원); 함영복(한국기계연구원); 박중호(한국기계연구원); 이성수(한국기계연구원)"
] | Two kinds of piezoelectric actuator are applied to the valve for controlling the direction, the flow and the pressure of the fluid. One is a stack type piezoelectric actuator which has very fast response characteristics but very tiny displacement. The other is a bender type piezoelectric actuator which has also fast response characteristics but lower than the stack type one, and has longer displacement than the stack type one. So, the bender type piezoelectric actuator has advantage to apply to the valve for controlling a large amount of flow and fast on-off operating.
In this study, the bender type piezoelectric pneumatic valve for color sorter is designed and fabricated. The new type high speed piezo valve with the both side supporting mechanism for high operating frequency and high reliability is discussed for separating the foreign body from the grains. Finally, the performance characteristics of a fabricated valve are analyzed and the frequency characteristics are also discussed for substituting the conventional type solenoid actuator. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.014 | kci_detailed_000119.xml | ||
ART001715669 | oai_dc | EGR 밸브 평가 장치 개발을 위한 EGR 장착 엔진 성능 및 배출 가스 특성 연구 | A Study on Exhaust Gas Characteristics and Engine Performance of EGR Valve Installed Engine for Development of EGR Valve Test System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"나동하(인하대학교); 고춘식(인하대학교); 서형준(Sambo Motors); 이창언(인하대학교)"
] | In this study, in order to understand contents and ranges of design for the EGR Valve test system for improving quality and performance of EGR Valve, engine performance and exhaust gas characteristic of 3L-class diesel engine was analyzed. Experimental operation of engine performance test was performed with 50% engine load and 20% and 100% opening ratio of EGR Valve. From test of performance and exhaust gas characteristic of engine, torque output of engine and temperature and pressure of inlet and outlet of EGR Valve were measured. As a result, for design of EGR Valve test system, input fluid flow of EGR Valve must be set the same amount with exhaust gas flow that was below of engine speed of 2,500 rpm, and temperature of inlet of EGR Valve must be set under about 510℃. And the difference of temperature between inlet and outlet of EGR Valve must be over than about 200℃. Exhaust gas of inlet and outlet of EGR Valve were under 1 bar that was not considerable, and the difference of pressure between inlet and outlet of EGR Valve were under 1 bar that could not effect on mechanical operation of EGR Valve. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.052 | kci_detailed_000119.xml | ||
ART001715665 | oai_dc | 유량제어용 서보밸브와 비례방향밸브의 압력신호를 이용한 정적 성능 진단에 관한 연구 | Static Performance Diagnosis Based on Pressure Signal for a Flow Control Servovalve or Proportional Direction Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성동(금오공과대학교); 전세형(금오공과대학교); 김인동(금오공과대학교); 함영복(한국기계연구원)"
] | Most diagnosis methods for servo valves requires installing spool displacement sensor or flow sensor as well as pressure sensor. The measurement of flow is hard to implement and many kinds of servovalves or proportional direction valves do not have a built-in spool displacement sensor. In this study, static performances of servovalve or proportional-direction-valve are studied theoretically and a diagnosis technique, which uses only load pressure and input current signal, is assessed. An experimental setup was made based upon a personal computer and the LabVIEW graphical language. A series of diagnosis tests were performed and the analysis results showed it possible to measure the pressure gain, hysteresis and null bias in a relatively simple methodology. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.032 | kci_detailed_000119.xml | ||
ART001715663 | oai_dc | 표면조직 가공한 유압부품면에서의 윤활특성 | Lubrication Characteristics of Surface Textured Hydraulic Machine Components | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이준오(경상대학교); 박태조(경상대학교)"
] | Friction reduction between sliding hydraulic machine components is required to improve efficiency and reliability of hydraulic machineries. It is recently reported that surface texturing on sliding bearing surfaces can reduce the friction force highly. In this paper, numerical analysis is carried out to investigate the effect of dimple numbers and inlet boundary pressures on the lubrication characteristics of a parallel sliding bearing using a commercial computational fluid dynamics (CFD) code, FLUENT. The results show that the pressure distribution, load capacity, dimensionless friction force and leakage with dimple number and their locations, and inlet pressures. The overall lubrication characteristics are highly affected by dimple numbers and boundary pressure. The numerical method adopted and results can be used in design of efficient hydraulic machine components | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.026 | kci_detailed_000119.xml | ||
ART001715667 | oai_dc | Development of a mathematic model for a variable displacement vane pump for engine oil | Development of a mathematic model for a variable displacement vane pump for engine oil | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"DINH QUANG TRUONG(울산대학교); 안경관(울산대학교); 윤종일(울산대학교); 이재신(울산대학교)"
] | Variable displacement vane‐type oil pumps represent one of the most innovative pump types for industrial applications, especially for engine lubrication systems. This paper deals with a modeling method for theoretical flow rate investigation of a typical variable displacement vane‐type oil pump. This theoretical model is based on the pump geometric design and dynamic analyses. It can be considered as mandatory steps for a deeper understanding of the pump operation as well as for effectively implementing the pump control mechanisms to satisfy the urgent demands of engine lubrication systems. The developed pump model is finally illustrated by numerical simulations. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.042 | kci_detailed_000119.xml | ||
ART001715655 | oai_dc | 밸브구동용 보이스 코일 선형 포스모터 설계와 해석 연구 | A Study on the Design and Analysis of a Voice Coil Linear Force Motor for Hydraulic Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박창순(한국기술교육대학교); 허준영(한국기술교육대학교)"
] | The voice coil linear force motor is a kind of a direct drive motion device that uses a permanent magnetic field and coil winding to produce force. In order to design a voice coil linear force motor, an exact calculations of the required force, the flux density in air gap and the flux pathway are needed. A conventional method can be used usually to calculate the flux density in air gap, but with this method it is needed to find a magnetic circuit revision constant. In this paper a voice coil linear force motor is designed by conventional design method and analyzed by 3D simulation program "Flux". For the prototype linear force motor, the results of the calculated by conventional design method and the analyzed by 3D simulation program are compared with the test result. Finally it is showed that the magnetic circuit revision constant which is found by comparing of the analyzed and the measured data can be used for the design of the voice coil type linear force motor to minimize the trial and error. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.001 | kci_detailed_000119.xml | ||
ART001715670 | oai_dc | 아날로그 PID 제어기를 이용한 2단 비례 압력 제어 밸브의 실현에 관한 연구 | A Study on PID Control Law's Realization for 2-Stage Proportional Pressure Control Valve with Analog Controller | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤소남(한국기계연구원); 정황훈(한국기계연구원)"
] | The customers who used the hydroulic system desire the product that has more detailed specification quickly during the industrial technology is developed. Every researcher try to reduce the developed period and to satisfy the customers' desire. Lot's of simulation software and hardware already was used to be satisfied those purpose. But these kind of equipment need a lot of cost to set up and technical knowledge to drive that system.
This paper concerns about analog PID controller that can be assembled with a few resistor, condenser and optional amplifier and doesn't need technical knowledge to drive. At the first, the plant was modeled mathematically to design the analog PID controller's circuit. After that, PID controller's parameter was selected by customers' desire. Finally, the analog PID controller's circuit was assembled from the control law. The circuit's availability was confirmed by step response test in the controlled system. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.058 | kci_detailed_000119.xml | ||
ART001715661 | oai_dc | Energy Efficiency & Sustainability the Cleanliness Management Role of Components and System in Automotive and Hydraulics | Energy Efficiency & Sustainability the Cleanliness Management Role of Components and System in Automotive and Hydraulics | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"홍정희(한국폴(주)); 마이크데이(CMS Consultant Ltd.)"
] | This paper explains how eliminating contamination from the manufacturing processes will lead to better product quality and hence the need for reworking, a trouble free commissioning period and greatly improved production efficiency. All of these will reduce costs and energy usage. It will also ensure that the product is delivered to the customer in a condition that will ensure improved reliability and longer life, again reducing both energy and other operating costs. Correctly designing the contamination control measures will achieve and maintain the level of fluid cleanliness that is required by the end user. The filter is critical to cleanliness management and should be selected with the same degree of thought and consideration as for other major components.
This paper explains the role that Cleanliness Management plays in the reducing the carbon footprint of systems and processes by making them perform more efficiently for longer periods. It also examines two differing ways of selecting filters to incorporate the features of newer designs, and shows how significant savings in the costs of ownership can be achieved using these approaches. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.019 | kci_detailed_000119.xml | ||
ART001715673 | oai_dc | 사판식 구동 모터에 장착된 밸브의 동적거동 해석 | Dynamic Analysis of the Valves installed in the swash plate type of Hydraulic Driving Motor | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"노대경(가천대학교); 장주섭(가천대학교)"
] | Recently, hydraulic motor is getting the spotlight. It is resulted from rapid civil engineering public works by a lot of developing countries around the world. In this study, we divided the valves which are affixed in the hydraulic motor into some parts, implemented them through computer simulation, verified validation of each component, and analyzed behavior adding driving condition. Through the analyzed results with general driving condition, we found the reason why behavior became unstable as the motor had started spinning. Through the analyzed results with tough driving condition, we verified that the valve works well with it's production purpose. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.062 | kci_detailed_000119.xml | ||
ART001715657 | oai_dc | 전기기계 브레이크가 적용된 연료전지 자동차의 회생제동 시스템의 고장해석 | Analysis of Fault Diagnosis of Regenerative Braking System for Fuel‐Cell Vehicle with EMB System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"송현우(성균관대학교); 최정훈(성균관대학교); 황성호(성균관대학교); 전광기(자동차부품연구원); 최성진(자동차부품연구원)"
] | Recently, researches about the eco‐friendly vehicles such as hybrid electric vehicle, fuel cell vehicle and electric vehicle have been actively carried out. The regenerative braking system is a key technology to improve the vehicle energy utilization efficiency because it transforms the kinetic energy to the electric energy through the electric motor. This new braking system requires cooperative control between electric controlled brake and regenerative brake. Therefore, it is necessary to establish fault‐diagnosis and fail‐safe evaluation criteria to secure reliability of the regenerative braking system. In this paper, the failure types and causes in regenerative braking system were analyzed. The transient behavior characteristics were examined based on fault‐diagnosis and fail‐safe upon failure of regenerative braking system. | 기계공학 | null | http://dx.doi.org/10.7839/ksfc.2012.9.4.008 | kci_detailed_000119.xml | ||
ART001664931 | oai_dc | Fuzzy Controller Design for a Automotive Air Suspension | Fuzzy Controller Design for a Automotive Air Suspension | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류하오(계명대학교); 이재천(계명대학교)"
] | 본 연구의 목적은 에어 서스펜션 시스템의 제어 특성을 분석하는 것이다. 우선 에어 서스펜션시스템의 수학적 모델을 구하였다. 그리고 퍼지 제어 알고리즘을 적용하여 반능동식 하이브리드 제어 에어 서스펜션을 구하였다. 차체 가속도에 따라 퍼지 제어기는 오리피스 개도를 변경하여 특정 영역에서에어 스프링의 강도를 조정한다. 동시에 서스펜션 운동 상태에 따라 서스펜션 댐핑이 제어된다. 시뮬레이션 결과는 반능동식 하이브리드 제어 에어 서스펜션이 노면 접지능력의 상실이나 서스펜션 작동 공간의 증가 없이 최고의 승차감을 제공할 수 있음을 보여준다. | 기계공학 | null | http://dx.doi.org/ | kci_detailed_000119.xml | ||
ART001664935 | oai_dc | 공급압력 변화에 의한 공기압 실린더 구동장치의 소비에너지 변화량 추정 방법 | A Method of Estimation of Energy Consumption according to a Supply Pressure for Pneumatic Cylinder Driving Apparatus | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장지성(부경대학교)"
] | Pneumatic cylinder meter-out driving apparatus is used widely because it is clean, lightweight, and can be easily serviced. In this study an estimation method of energy consumption for pneumatic cylinder meter-out driving apparatus is proposed. The proposed method is derived from state equation and energy equation of air, and, the equation of motion of a moving part of a pneumatic cylinder reflecting the characteristics of the meter-out driving.
The effectiveness of the proposed method is proved by simulation study and it demonstrates that the proposed method can evaluate the energy consumption quickly and easily when the parameters of the driving apparatus are changed. | 기계공학 | null | http://dx.doi.org/ | kci_detailed_000119.xml | ||
ART001664933 | oai_dc | 전기유압식 스프링복귀 액추에이터 정특성 | Static Characteristics of Electro-Hydraulic Spring Return Actuator | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | Electro-hydraulic spring return actuator(ESRA) is utilized for air conditioning facilities in a nuclear power plant. It features self-contained, hydraulic power that is integrally coupled to a single acting hydraulic cylinder and provides efficient and precise linear control of valves as well as return of the actuator to the de-energized position upon loss of power. In this paper, the algebraic equations of ESRA at steady-state have been developed for the analysis of static characteristics that includes control pressure and valve displacement of pressure reducing valve, flow force on flapper as well as its displacement over the entire operating range. Also,the effect of external load on piston deviation is investigated in terms of linear system analysis. The results of static characteristics show the unique feature of force balance mechanism and can be applied to the stable self-controlled mechanical system design of ESAR. | 기계공학 | null | http://dx.doi.org/ | kci_detailed_000119.xml | ||
ART001578332 | oai_dc | 지능형 대용량 비례유량제어밸브 서보컨트롤러 설계 | Design of Intelligent Servocontroller for Proportional Flow Control Solenoid Valve with Large Capacity | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | As the technologies of electronic device have advanced these days, most of mechanical systems are designed with electronic control unit to take advantage of control parameter adaption to operating conditions and firmware flexibilities as well. On-board diagnosis, which detects the system malfunction and identifies potential source of error with its own diagnostic criteria, and fail-safe that can switch the mode of operation in view of recognized error characteristics enables easy maintenance and troubleshooting as well as system protection. This paper dealt with the development of diagnosis and fail-safe function for proportional flow control valve. All type of errors related to valve control system components are investigated and assigned to a specific hexadecimal codes. Cumulative error detection algorithm is applied in order for the sensitivity and reliability to be appropriate. Embedded simulator which runs simultaneously with system program provides the virtual error simulation environment for expeditious development of error detection algorithm. The diagnosis function was verified both with solenoid valve and embedded simulator test and it will enhance the valve control system monitoring function. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001578338 | oai_dc | A Dual Vacuum Wafer Prealigner and a Multiple Level Structure | A Dual Vacuum Wafer Prealigner and a Multiple Level Structure | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김형태(한국생산기술연구원); 최문수((주)나인벨)"
] | This study aims at aligning multiple wafers to reduce wafer handling time in wafer processes. We designed a multilevel structure for a prealigner which can handle multiple wafer simultaneously in a system. The system consists of gripping parts, kinematic parts, vacuum chucks, pneumatic units, hall sensors and a DSP controller. Aligning procedure has two steps: mechanical gripping and notch finding. In the first step, a wafer is aligned in XY directions using 4-point mechanical contact. The rotational error can be found by detecting a signal in a notch using hall sensors. A dual prealigner was designed for 300mm wafers and constructed for a performance test. The accuracy was monitored by checking the movement of a notch in a machine vision. The result shows that the dual prealigner has enough performance as commercial products. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001578346 | oai_dc | 공기압 실린더용 저마찰 피스톤 실의 특성해석 | Analysis of a Low Friction Piston Seal in Pneumatic Cylinders | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도태(경일대학교); 장중걸(경일대학교)"
] | Nonlinear seal friction in pneumatic cylinders can impede the performance of pneumatic systems designed for high precision positioning with favorable high speed actuation. The behaviour of an elastomeric piston seals in high speed pneumatic cylinders is analyzed by nonlinear finite element analysis using ABAQUS.
The contact pressures, stress and strain distributions and frictional forces of the squeeze type piston seal are simulated with variation of the seal radial installed interference, the operating pressures, friction coefficients and piston rod velocities. The nonlinear finite element model of the squeeze type piston seal is used to predict deformation of a seal, friction force and contact pressure distributions. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001578334 | oai_dc | 전달관로를 고려한 공기압 구동장치의 힘 제어에 관한 연구 | Force Control of a Pneumatic Driving System With a Long Transmission Line | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장지성(부경대학교)"
] | In the present study, a robust controller has been designed to control force for a pneumatic driving system considering the effect of a transmission line. Transfer characteristics of pneumatic transmission line should be changed according to the velocity of the air going through the transmission line. The designed controller is composed of two parts. The one is a feedback controller, which is composed of a stabilizing filter,a compensating filter of modelling error and a nominal model of the force control system, to compensate the influence of transmission line and improve the feedback characteristics of the control system, and, the other is a feedforward controller to achieve the control performance. Control results with the designed controller show that the robustness and performance of the control system are improved compared to the control results with a fixed gain controller. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553529 | oai_dc | 인벌류트 기어펌프의 2차원 유동특성 | Characteristics of Two Dimensional Flow in an Involute Gear Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성훈(계명대학교); 손혜민(계명대학교); 이재천(계명대학교)"
] | Analysis of two-dimensional flow in an involute gear pump has been done by using FLUENT.
Analysis extended to the turbulent flow includes the mass flow rate with functions of pressure difference between inlet and outlet, rotational velocities of involute gear, and clearances between tip of gear and housing.
In general mass flow rate decreases with decreasing rotational velocity, and with increasing clearance and pressure difference. The flow rate efficiency of gear pump, which is defined with the theoretical flow rate, has been presented in terms of the above parameters. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553528 | oai_dc | 유압단축제어기(HACD)를 사용한 위치 및 압력제어 | Position and Pressure Control Using Hydraulic Axis Digital Controller | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김대호(한국기술교육대학교); 허준영(한국기술교육대학교)"
] | These days the injection molding work and press work are in the trend of needing the precision control of position and pressure in a high speed. On the other hand the digital computer technology is developing rapidly. And recently the digital servo controller using micro controller become to be used more broadly, because of the merit of digital communication. In this study the sequential control of hydraulic system switching from position to pressure and to position is tried using the HACD(Hydraulic Axis Controller Digital for electrohydraulic drives) which is manufactured by BoschRexroth. Through this, the possibility of the precision sequential control using the digital servo controller HACD is examined. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553526 | oai_dc | 자동차 공기스프링의 특성에 대한 실험적 고찰 | An Experimental Investigation on the Characteristics of An Automotive Air Spring | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이재천(계명대학교); 류하오(계명대학교)"
] | The analysis of an air spring characteristics is necessary to design and control automotive air suspension system properly. A mathematical model of an air spring was derived in light of energy conservation first. Then static and dynamic experiments of the air spring have been fulfilled. The static stiffness with various initial pressures and effective areas were obtained from the static experimental results. Theoretical static stiffness obtained by using the mathematical model and effective area data is in close accordance with the experimental estimation. The dynamic experimental results show that the hysteresis in displacement-force cycle decreases when the frequency of the harmonic displacement excitation signal increases, but it does not change too much as the frequency is higher than 1Hz. And the dynamic stiffness goes up with increasing of the initial pressure and the excitation frequency. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553525 | oai_dc | 회전날개 길이를 이용한 제로터 펌프/모터의 배제용적에 관한 연구 | An Analysis on Volumetric Displacement of Gerotor Pump/Motor Using Vane Length | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성동(금오공과대학교); 김대명(금오공대); 함영복(한국기계연구원); 한철호(금오공과대학교)"
] | It is hard and complicated to analytically derive the volumetric-displacement formula of a gerotor pump/motor. Analytical formulas for calculating the volumetric-displacement are derived in this work, which is relatively easy and based upon vane lengths. The vane lengths mean the distances from axis of inner rotor or outer rotor to contact points between inner and outer rotors. Two kinds of formula were studied for two different kinematic motions of rotors. The first one is the case that outer rotor is fixed in space and inner rotor is in mixed motion of planetary revolution and rotation with respect to the spinning axis. And the second is the case that both inner and outer rotors simultaneously rotate. The proposed formula is verified through comparison with volumetric-displacement obtained from numerical CAD calculation. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553524 | oai_dc | 유압을 이용한 도립진자의 LQ제어 | LQ Control of Inverted Pendulum Using Hydraulic | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정성원(한국기술교육대학교); 허준영(한국기술대학교); 이인석(한국기술대학교)"
] | An inverted pendulum mounted on a cart and actuated by a hydraulic servo cylinder was designed and built. Position information of the cart was acquired via a potentiometer and a angle of the pendulum was sensed by an incremental encoder. These were collected by a DAQ board and processed through the Real-Time Windows Target software(included in simulink). A simulink graphical program was implemented as a controller of the hydraulic system that governed the motion of the cart in order to maintain vertical balance of the inverted pendulum. The purpose of this study is to develop an electro-hydraulic inverted pendulum system for a modeling and controling the intrinsic unstable system. The simulation results were compared with the experimental and verified. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001553527 | oai_dc | 유압모터-부하계의 3D CAD 모델링 및 적응제어 | 3D CAD Modeling of a Hydraulic Motor-Load System and Adaptive Control | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조승호(홍익대학교)"
] | This paper investigates the motion control of a hydraulic motor-load system using the Simple Adaptive Control (SAC) method. The plant transfer function has been modelled mathematically. The open-loop responses have been obtained experimentally in order to identify the design parameters of transfer function. The hydraulic motor-load system has been modelled using the 3D CAD and imbedded in the hydraulic circuit simulation program to verify the overall performance. The experimental results confirm that the SAC method gives a good tracking performance compared to the PID control. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001603260 | oai_dc | 이색 사출성형기 개발을 위한 유압시스템의 특성 검토 | Characteristics Analysis of the Fluid Power System for a Double-color Injection Molding Machine Development | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장주섭(경원대학교)"
] | Double-color Injection molding machine is the assembly of many kinds of mechanical, fluid power part and electric electronic control system. From in these, fluid power is a part where becomes the first core of this machine. Fluid power systems of double-color injection molding machine are modelled and analyzed using a commercial program AMESim. Partial system models which is divided according to functional operation are made and its analysis results shows how design parameters work on operational characteristics like pressure,flow rates, displacement at each node and so on. Analysis modeling and compared the data which gets from experiment and the analysis result which has a reliability got data. The results made by analysis will be used design of fluid power circuit for developing a double-color injection molding machine. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001603257 | oai_dc | 비례유량제어밸브 네트워크 제어기 설계 | Design of Network Controller for Proportional Flow Control Solenoid Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | Proportional control solenoid is a type of modulating valve that can continuously control the valve position with magnetic force of solenoid. Recent microcontroller based digital servocontroller for proportional valve is being developed toward the smart valve with additional features such as enhanced control algorithm for finer process and intelligent on-board diagnosis for maintenance. In this paper, development of servocontroller network control with CAN bus which is free from problems of security and network traffic jam is presented.
Design of network control system includes modes of communication between master and slave, assignment of 29bit message identifier and message objects, transaction of communication sequence, etc. Monitoring function and control experiments for remote valve through CAN network prove the extended function of smart valve control system. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001603254 | oai_dc | 파일럿 비례압력제어밸브의 정특성 및 동특성에 관한 실험적 분석 | Experimental Analysis of the Static and Dynamic Characteristics for a Pilot Proportional Pressure Control Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정헌술(군산대학교); 남지우(군산대학교)"
] | Because of the increasing demand on the high precision and high response of a machinery,proportional control valves are widely adopted at various application fields. This paper studies on the static and dynamic characteristics of a pilot proportional pressure control valve. An experimental apparatus including hydraulic pump, variable speed inverter, pressure and flow sensors and data aquisition system was set up. And various experiments such as P-Q-V curves, step responses due to input voltage and flow rate, hysteresis,frequency response of the proportional valve was carried out and the results are discussed. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001603245 | oai_dc | 사출성형기 유압시스템의 특성 검토를 위한 해석 모델 개발 | Development of Analysis Model for Characteristics Study of Fluid Power Systems in Injection Molding Machine | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장주섭(경원대학교)"
] | Injection molding machine is the assembly of many kinds of mechanical and fluid power part and electro-electronic control system. From in these, fluid power is a part where becomes the first core of this machine. Fluid power systems of injection molding machine are modelled and analyzed using a commercial program AMESim. The analysis model which is detailed about the parts applied a publishing catalog data. Sub system models which is divided according to functional operation are made and its analysis results shows how design parameters work on operational characteristics like displacement, pressure, flow rates at each node and so on. Total fluid power circuit model is also made and analyzed. The results made by analysis will be used design of fluid power circuit of injection molding machine. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001470245 | oai_dc | 유압 피스톤 모터의 오리피스 변화에 따른 정압베어링의 특성에 관한 연구 | A Study on the Characteristics of the Hydrostatic Bearing by the Variation of the Orifice in Hydraulic Piston Motor | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김광민(한국기계연구원); 이용범(한국기계연구원); 김태석(한국기계연구원)"
] | 액셜피스톤 모터는 접촉하여 회전하는 부분에 정압베어링을 채용하기 때문에 고속, 고압화로 고출력밀도화가 가능하여 널리 사용되고 있다.
액셜피스톤 모터는 윤활부분의 마찰손실 및 용적손실과 기구적 조립부분의 마찰손실 및 오일의 관로 저항에 의한 압력저하와 압축성에 의한 체적손실 등이 있으며, 고압․고속화와 고 효율화 및 수명에 가장 큰 영향을 미치는 부분이 슈와 사판사이의 정압베어링이다.
정압 베어링과 관련된 윤활특성과, 정압베어링 비에 따른 윤활특성에 관한연구, 정압베어링 응답특성에 관한연구, 피스톤 슈의 균형과 형상을 중심으로 피스톤 슈 부분에 대한 해석연구 등이 있다.
본 연구에서는 가장 일반적인 형태인 하나의 리세스(recess)를 갖는 슈 정압베어링을 대상으로 실험을 통해 효율 및 누설유량의 변화 등을 관찰하고, 오리피스의 직경변화에 따른 정압베어링의 특성을 파악하고자 한다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001470251 | oai_dc | 차량 능동현가시스템에 대한 강인 제어 해석 | Analysis of an Robust Control for a Vehicle Active Suspension System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김주용(우송대학교)"
] | 자동차의 현가시스템은 “차축 위에서 자동차의 상부를 지지하고 있는 장치계”로 정의되며, 여기에는 주로 스프링, 감쇠기(damper), 작동기(actuator) 및 주변장치로 구성되어 있다. 이러한 현가시스템은 서로 상충되는 설계사양인 승차감(ride quality)과 조향성(handling)의 두 가지 기능을 수행한다. 현가시스템에서는 초기의 기계적 피동현가시스템으로부터 유압을 이용한 반능동 및 능동현가시스템이 있으나, 반능동 현가시스템이 단순 유체의 흐름을 몇 단계로 조절하는 반면, 능동현가시스템은 별도의 에너지원의 도움으로 외부 입력에 대하여 연속적으로 대응할 수 있는 장점을 지니고 있어 고급 승용차에 주로 장착되고 있다.
이러한 유압식 능동현가시스템의 구성은 유압공급원, 압력제어밸브, 액튜에이터, 센서류 및 이들을 통합 제어하는 ECU(electronic control unit)로 구성되어 있다. 능동 현가시스템에서 사용되는 제어방식에는 여러 가지가 있다. 초기의 스카이훅(sky-hook) 감쇠이론을 비롯하여, Cho등은 모델예견제어(model predictive control)를 사용하였다. 이러한 제어이론의 대부분은 상태 및 출력귀환제어를 이용한 최적제어이론에 바탕을 두고 있다. 일반적으로 유압식 능동 현가시스템은 유압이 갖는 비선형성, 모델링 오차, 시스템 파라미터의 변화 및 외란 등에 의하여 영향을 많이 받으며 이러한 영향을 줄여줄 수 있는 강인한(robust) 제어기가 필요하다. 따라서, 본 연구에서는 이러한 욕구를 충족시켜줄 수 있는 최적 가변구조제어(optimal variable structure control)이론을 사용하여 7자유도 차량 모델에 대하여 그 성능을 해석하고 기존의 피동 현가시스템 및 최적 제어기를 사용한 능동 현가시스템의 성능과 비교 검토하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001470241 | oai_dc | 적응제어 기법을 이용한 전기-유압 액츄에이터의 위치제어 | Position Control of an Electro Hydraulic Actuator Using Adaptive Control Method | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조승호(홍익대학교)"
] | 에너지절약 이슈(Issue)와 이산화탄소의 규제 등 환경문제로 인하여, 펌프를 직접 유압 액츄에이터에 연결하여 가변적으로 동력을 전달하는 정유압 동력 전달 방식1, 2, 3)이 최근 부각되고 있다. 대부분의 정유압 회로에서는 일정한 회전속도로 작동되는 배제용적이 가변인 펌프를 사용한다. 유압 액츄에이터의 운동은 유량의 크기와 방향을 변화시키는 펌프 사판의 동작에 의하여 제어된다. 이러한 회로는 펌프가 액츄에이터의 운동과 상관없이 연속적으로 계속 가동되므로 에너지 면에서 비효율적이다. 더욱이 가변용량 피스톤 펌프는 고정밀한 성능을 저해하는 리플(Ripple)효과를 초래한다2). 본 연구에서의 전기-유압 액츄에이터(Electro Hydraulic Actuator: EHA)는 AC서보 모터에 의하여 배제용적이 일정한 정용량 펌프의 속도와 방향을 변화시킴으로서 유량을 제어하는 방식을 채택한다3, 4). 유압서보기구는 항공기와 선박의 조타계, 공작기계, 건설기계,대형로봇 등에서 고속 대출력용 위치제어 구동기구로서 많이 사용되고 있다. 서보계의 특성이 부하변화 혹은 하드웨어적 제약에 의하여 크게 변화하는 일이 많으므로 대책이 필요하다. 고정도의 유압서보계를 구성하기 위해서는 제어기의 자동 조정기구를 갖춘 제어기법의 적용이 이상적으로 생각된다. 대표적인 기법으로서 플랜트의 특성변화에 대응해서, 제어기를 자동적으로 온라인 최적 조정하는 적응제어 기법을 들 수 있다. 그러나 적응제어 이론이 전제로 하고 있는 가정, 즉 제어대상의 선형성, 플랜트 차수의 기지, 최소위상, 무외란 조건을 유압서보기구가 만족하지 않을 때, 적응제어 알고리즘에 관계된 제어파라미터의 조정이 곤란하여 진다5). 단순적응제어(Simple Adaptive Control : SAC)는 제어계의 안정성을 출력 피드백 방식으로, 그 위에 설정입력에의 추종특성을 피드포워드 제어방식으로 제각기 적응적으로 보장하는 2-자유도 제어계 구조를 갖는 적응제어 기법이다5, 6). 제어기 구조가Fig. 1 EHA circuit 종래의 적응제어 방식에 비하여 단순하고 제어성능 및 강인성이 우수한 제어방식으로 알려져 있다7, 8). 그러나 지금까지 본 연구에서 사용한 EHA의 제어에 적용된 예는 보고되지 않았다. 여기서는 SAC기법의 EHA제어에 적용에 관하여, 기본적인 제어계 구성법을 고찰하고 실험에 의하여 그 유효성을 검토한다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001470248 | oai_dc | 유압펌프 회전속도 제어방식 유압제어시스템의 특성 비교 분석 | Comparative characteristic Analysis of a Hydraulic Control System using a Speed Controlled Hydraulic Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정헌술(군산대학교); 정승욱(군산대학교)"
] | 유압시스템은 건설기계, 공작기계, 자동차, 항공우주 산업분야 등 광범위한 분야에서 주요 동력원, 동력 전달 및 동력 제어 수단으로 사용되고 있으며, 유압시스템의 성능, 제어정밀도 내구성 향상 에 많은 개발이 이뤄져 왔다.
최근 환경 및 에너지에 대한 관심의 증가와 석유 자원의 수급 불안정으로 인해, 건설장비, 자동차산업을 포함한 전 산업분야에서 친환경 에너지에 대한 관심이 폭발적으로 증가하고 있다. 이는 국내는 물론 전 세계적인 공통 현상으로써, 새로운 에너지의 원천기술 개발은 물론, 기존 산업분야에서 에너지 효율 극대화를 꾀하기 위한 다양한 방면의 본격적인 연구 개발이 진행되고 있다.
그에 발맞추어, 본 연구에서는 유압시스템 에너지 효율 향상의 일환으로, 유압펌프를 구동하는 전기모터의 회전속도 제어시스템의 제어성능 및 효율에 대하여, 기존 밸브제어 및 펌프 용량제어 시스템과의 특성을 비교해 보고자 한다.
보통 유압시스템은 고정용량(fixed displace- ment)형 유압펌프로 유압 동력을 발생시키고, 액추에이터의 제어는 전담 밸브를 배치하여 해당 힘 또는 속도를 조절하며, 유압회로의 시스템 압력은 압력 레귤레이터로서 유지하는, 밸브제어 시스템(valve controlled system)을 채택하는 것이 일반적이다. 한편 이 경우 발생되기 쉬운 잉여 유압동력의 절감을 목표로, 가변용량(variable displace- ment)형 유압펌프를 사용하여 시스템에 소요되는 만큼 유압동력을 공급하는 펌프 용량제어 시스템(pump capacity controlled system)을 채택하기도 한다. 반면, 최근 전력전자 요소기기의 발달과 전기모터 동력밀도의 개선으로, 전기모터를 유압동력의 제어기구로 채택한 펌프속도 제어시스템(pump speed controlled system)이 시도되고 있다.
본 연구에서는 이러한 배경을 바탕으로 유압시스템용 제어방식으로 유압펌프 속도제어 시스템의 채택 가능성과 성능 및 효율특성을 검토해 보고자 한다. 본 논문에서는, 위치제어가 어렵다고 알려진 벨트-풀리에 하중에 매달려 있는 카운터 밸런스(counter balance) 회로를 대상으로, AMESim 모델링 및 시뮬레이션 해석을 수행하고 모터제어 시스템에 대한 실험을 수행함으로써, 그 적용 가능성을 분석해 본다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001638709 | oai_dc | 고속 공기압 실린더의 피스톤 실 단면형상 변화에 따른 마찰특성 | The Friction Characteristics with Variation of Cross Section of Piston Seals for High Speed Pneumatic Cylinders | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김도태(경일대학교); 장중걸(경일대학교)"
] | The paper deals with the design of a new low-friction seal for a pneumatic cylinder with high speed actuation. The seal performance with variation of the cross sections in piston seals with elastomeric material was investigated to minimize the friction forces using ABAQUS. The contact stress and strain distributions and frictional forces of the piston seals were investigated with variation of interference fits, supply pressures and friction coefficients. To develop adequate and productive procedures, the finite element models of the piston seals were created and nonlinear analysis of a seal design was conducted in order to build further knowledge and understanding of the seal's performance characteristics. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001638707 | oai_dc | A Study of Energy Saving Hydraulic System by A Pressure Coupling Hydrostatic Transmission | A Study of Energy Saving Hydraulic System by A Pressure Coupling Hydrostatic Transmission | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"도황팅(울산대학교); 안경관(울산대학교)"
] | Nowadays, the demand of energy saving is increasing more and more while the natural resources have been exhausted. Besides, the emission gas caused by vehicles has been being a serious environment problem.
Therefore, many studies have been carried out, especially focusing on braking energy regeneration, in order to save energy as well as reduce emission of mobile vehicles. In this paper, we propose a closed-loop hydrostatic transmission for braking energy regeneration with two configurations to reduce the energy consumption by recovering the braking energy. The effectiveness of the proposed system was verified by simulation. The simulation results indicated that the pressure coupling configuration gave better performance in comparison to flow coupling configuration about 40.8%, 61.7% and 53.8% reduction of fuel consumption in 10 mode, 10 mode modified profile and highway schedules, respectively. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001638704 | oai_dc | 전기유압식 브레이크를 장착한 연료전지차량의 회생제동 천이구간 특성해석 | Transient Characteristic Analysis on the Regenerative Braking System of Fuel-cell Electric Vehicle with Electro-Hydraulic Brake | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최정훈(성균관대학교); 황성호(성균관대학교); 조배균(성균관대학교); 박진현(성균관대학교)"
] | Nowadays, various researches about eco-friendly vehicles such as hybrid electric vehicle, fuel cell vehicle and electric vehicle have been actively carried out. Since most of these green cars have electric motors, the regenerative energy technology can be used to improve the fuel economy and the energy efficiency of vehicles. The regenerative brake is an energy recovery mechanism which slows a vehicle by converting its kinetic energy into electric energy, which can be either used immediately or stored until needed. This technology plays a significant role in achieving the high energy usage. However, there are some technical problems for controlling the regenerative braking and the electro-hydraulic brake during switching at transient region. In this paper, the performance simulator for fuel-cell vehicle is developed and transient response characteristics of the regenerative braking system are analyzed in the various driving situations. And the hardware-in-the-loop simulation of electro-hydraulic brake is performed to validate the transient characteristics of the regenerative braking system for fuel-cell electric vehicle. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001526580 | oai_dc | 비례제어밸브용 디지털 앰프·컨트롤러에 대한 연구 | A Study on a Digital Amplifier·Controller for Proportional Control Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이재천(계명대학교); 고재욱(계명대학교); 권태황(계명대학교); 신행봉((주)SG Servo)"
] | This study presents the design of digital amplifier･controller for a proportional control valve and the development of PID discrete control scheme by using RCP(Rapid Controller Prototyping) system. RCP system is the device to embed the control code developed in PC into the microcontroller on-site. Ramp input test using the digital amplifier･controller developed in this study was carried out for the proportional control valve of domestic production and Bosch Rexroth respectively. The instability problem occurred around maximum displacement of localized valve spool at ramp input test was solved by supplementing offset current to the duty ratio of PWM(Pulse Width Modulation) driving signal to the solenoid. The comparison of test results between localized proportional control valve and Bosch Rexroth's product shows that the characteristics obtained by ramp input test and static flow gains are alike each other. Two valves are about the same in null dead bands and hysteresis characteristics. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001526577 | oai_dc | 회전 캠 및 고정 실린더식 레이디얼 피스톤 펌프의 송출 유량 특성 | Discharge Flow Characteristics of A Rotating-Cam and Fixed-Cylinder Type Radial Piston Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이일영(부경대학교); 최세령(부경대학교)"
] | In the beginning of this study, pressure in a cylinder and flow rate from a cylinder of a rotating-cam and fixed-cylinder type radial piston pump are investigated through numerical simulations, so that the simulation results might be utilized as basements for examining physical phenomena occurring in the pump assembly. Then, for supplying basic knowledge on pump design, pressure, flow and leakage characteristics of the pump assembly under the variations of major design parameters are investigated through numerical simulations. At the end, key design parameters influencing upon volumetric efficiency of the pump are listed. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001526582 | oai_dc | 밸브구동용 선형 포스모터 설계를 위한 해석 연구 | A Study of Analyzing for Design of a Linear Force Motor for Hydraulic Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박창순(한국기술교육대학교); 허준영(한국기술교육대학교)"
] | To drive hydraulic valve is used Linear force motor, whose force and direction are controlled by electronic signals. Linear force motor has complicated figure and its force produced by changing of flux density which is produced by permanent magnet and electrical winding. Therefore it is needed an exact calculation of the flux density. In this paper a Linear force motor is designed and analysed by 3d program Flu calculating the flux density in air gap and in yoke, Force by different current. The analysed data will be tested by prototype Linear force motor. The data and analysing method can be used for designing Linear force motor. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001526574 | oai_dc | 밸브 구동용 고속 리니어 액추에이터 | A Design of High-Speed Linear Actuator for Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"성백주(한국기계연구원)"
] | The main design factors which effect on operating speed of linear actuator for valve operation are mass of plunger, electromagnetic motive force, inductance, and return spring, and these factors are not independent but related with each other in view point of design and electromagnetic theory. It is impossible to increase the operating speed by only change the value of any one design factor. The change of any one value results in change of any value related it in various design factors. This paper presents a speed increasing method of linear actuator using a solenoid design method by some governing equations which are composed of electromagnetic theory and empirical knowledge and permanent magnets as assistant material, and proved the propriety by experiments. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496467 | oai_dc | 정유압식 래크바형 수문권양기의 개발 | Development of the Rack-Bar Type Sluice Gate Applying the Hydrostatic Transmission | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이성래(건양대학교)"
] | 정유압식 유압장치에 대한 수학적 모델식을 유도하고 컴퓨터 시뮬레이션을 실시하였다. 그 후 수차례의 설계 변경을 거치면서 기존 유압모터를 감속기가 부착된 유압모터로 교체하여 권양력을 증가시키고 펌프의 회전속도 증가에 따라 첵밸브, 파일럿작동첵밸브, 카운터밸런스밸브 등의 용량을 증가시켜 진공압 발생을 억제하였다. 이러한 변경된 사항을 고려하여 컴퓨터 시뮬레이션을 재실시하였고 정유압식 래크바형 수문권양기의 시작품을 제작하고 성능시험을 실시하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496503 | oai_dc | 가변압축기용 제어 밸브의 전자력 향상 설계 | Design for Improving Magnetic Force of Control Valve in Variable Compressor | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이용주(두원공과대학); 이건호(두원공과대학)"
] | 자동차에 사용되고 있는 에어컨용 압축기는 엔진의 동력을 많이 소모하기 때문에 자동차에서 효율성이 가장 요구되는 부품중의 하나이다. 현재 각 메이커에서는 이러한 압축기의 효율을 높이기 위해서 근래의 차량에는 동력소모가 많은 고정용량식 압축기에서 동력 소모가 적고 효율이 높은 가변 용량식 압축기가 주로 장착되고 있다. 이 가변용량식 압축기는 토출용량을 엔진의 부하에 따라서 기계적으로 변동시키는 기계식 밸브로 제어하는 내부 가변식 압축기와 외부의 제어 신호에 의해서 제어하는 외부 가변식 압축기로 구분될 수 있다.
가변 압축기는 풀리를 사용해서 엔진과 벨트로 연결되어 있으며 엔진의 회전력에 의해서 구동되도록 되어 있다. 경사져 있는 사판을 피스톤이 왕복운동을 하면서 냉매을 토출하는 구조로 되어 있다. 자동차 실내의 온도가 높거나, 엔진의 부하가 작을 때에는 이 사판의 각도를 크게 하여서 피스톤의 행정거리를 최대로 한다. 이렇게 하면 피스톤의 토출유량도 증가하게 되고 에어컨 시스템의 냉매 순환량이 많아져서 실내 온도가 빠르게 저하된다. 실내의 온도가 적정하게 낮아지게 되면 이 사판의 각도를 줄어들어서 피스톤의 행정거리를 줄이고 토출유량도 감소시킨다. 이 때에는 엔진의 소모동력도 줄어들게 된다. 이러한 압축기의 사판의 각도를 제어하기 위해서 사용되는 밸브를 외부제어밸브라고 한다. 이러한 제어밸브는 입력되는 전류에 비례한 전자력이 발생하여 플런저를 구동시키고 이 플런저의 구동에 의해서 흐르는 유량을 제어하고 있는 것이다.
이기수 등은 다단 자동변속기용 유압비례제어 솔레노이드 밸브의 CFD 해석1)을 하였으나 유압제어용 솔레노이드 밸브로 사용조건이 본 연구의 밸브와 상이하며 윤소남 등은 배기 브레이크용 솔레노이드 밸브의 특성 해석 등에 관한 연구2～3)를 수행하였으나 최근 업계에 등장하고 있는 차량 에어컨 압축기를 위한 제어 밸브의 솔레노이드에 관한 연구는 아직 수행되지 못하고 있는 실정이다. 본 연구는 솔레노이드와 벨로우즈를 내재하고 있는 외부 가변식 압축기에 사용되는 제어밸브의 전자력을 해석하는 방법을 알아보고 실험과 시뮬레이션 해석을 통해 이를 향상시킬 수 있는 설계를 제안하고자 한다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496478 | oai_dc | 환자통증조절장치(PCA)의 유량제어조절기 개발 | Development of the Flow Control Regulator for Patient Controlled Analgesia | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김세윤(강릉원주대학교); 송성재(강릉원주대학교); 서현배((주) 현메딕스)"
] | 용량고정방식은 세분화된 용량 범위로 다양하게 제품을 만들기 어렵기 때문에 각 회사별로 2가지에서 12가지의 종류만 개발되어 있다. 이는 사용자 입장에선 종류별로 많은 재고를 필요로 하고 있으며 의사들 입장에서도 고정된 용량으로 치료를 유도하여야 하므로 어려운 점이 있다. 또한 기존 제품들에서 사용되는 압출 성형된 모세관은 온도 변화에 민감하고 정밀도가 높지 않아 같은 용량의 길이에서도 약액의 양이 일정하지 않고 상당한 오차범위를 갖고 있다. 따라서 본 연구에서는 기존 제품의 PCA 유량조절부의 단점을 극복할 수 있는 새로운 형태의 유량제어조절기를 개발하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496475 | oai_dc | 감쇠력 가변댐퍼를 이용한 반능동 현가장치의 실차실험 특성에 관한 연구 | A Study on the Field Test Characteristics of Semi-Active Suspension System with Continuous Damping Control Damper | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이광헌(군산대학교); 정헌술(군산대학교); 이춘태(신라대학교)"
] | 최근, 감쇠력 가변댐퍼를 장착한 반능동 현가장치에 의해 차량의 주행안정성과 승차감이 획기적으로 개선되어 이 분야의 연구에 대한 관심이 커지고 있다. 감쇠력 가변댐퍼를 장착한 반능동 현가장치는 주로 고급 차종에 장착되는 첨단의 현가장치로서 이 분야의 연구는 1970년 경 부터, 기존(conventional) 댐퍼의 한계를 탈피하기 위하여 시작되었다. 즉, 기존 댐퍼는 감쇠력을 결정하는 유로의 크기가 한가지로 고정되어 있어 감쇠력을 소프트(soft)하게 제작할 경우는 승차감은 향상되지만 이와 함께 고속과 선회 시 주행안정성이 저하되고, 감쇠력을 하드(hard)하게 제작 할 경우는 주행안정성은 향상되지만 승차감이 악화되는 특성을 가지고 있다.1-3) 따라서 차량의 승차감과 주행안정성을 동시에 만족시키기 위하여 감쇠력을 차량의 주행상황에 따라 가변 시킬 수 있는 현가장치의 개발이 필요하게 되었다.
이 필요성은 Karnopp4)에 의해 제안된 스카이훅(sky-hook) 감쇠제어 알고리즘에 근거하여 연구, 개발이 추진되어 왔고 1999년 최초로 연속 감쇠력 가변댐퍼를 장착한 차량이 출시되었다. 그러나 이러한 기존의 연구는 대부분 이론적인 내용5-8)이 주를 이루며, 반능동 현가장치를 장착 한 차량 특성에 미치는 영향에 대한 연구는 매우 부족한 실정이다. 따라서 본 연구에서는 반능동 현가장치를 장착한 차량을 이용한 실차시험 결과를 제시하고, 반능동 현가장치가 차량운동 특성에 미치는 영향에 대하여 분석하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496471 | oai_dc | 시스템 식별을 이용한 비례솔레노이드밸브 위치제어기 설계 | Design of Position Controller for Proportional Solenoid Valve Using System Identification | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | 본 연구에서는 대용량 유량제어에 적용되는 비례솔레노이드밸브를 대상으로 밸브변위를 제어하는 기능의 위치제어기를 산업계에서 일반적으로 사용되는 비례적분제어기로 설계하였다. 이를 위하여 연구대상 비례솔레노이드밸브의 작동원리와 전류특성을 고찰하였고 제어기 설계를 위한 동적모델은 시스템 식별을 이용하였다. 제어기 이득은 식별된 모델과 비례적분제어기로 구성되는 폐루프 제어시스템의 주파수응답이 목표사양에 근접하도록 선정하였으며 위치제어시험을 통하여 제어성능을 검증함으로써 설계방법의 타당성을 입증하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001496457 | oai_dc | 파워스티어링용 유압펌프의 일체형 풀리 개발 | Development of Monolith Type Driving Pulley of Power Steering Hydraulic Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이춘태(신라대학교)"
] | 본 연구에서는 일체형 구동풀리의 제작공정 변경에 따른 구동풀리의 압출하중(extracting force)에 대한 안전성을 검토하기 위하여 유한요소 해석방법을 사용하였다. 또한, 실험을 통하여 해석결과의 타당성을 검토하였고, 진동내구시험을 실시하여 일체형 풀리의 진동내구성능을 검증하였다.
| 기계공학 | null | kci_detailed_000119.xml | |||
ART001496452 | oai_dc | A Study on Modeling and Simulation of Hydraulic System for a Wheel Loader using AMESim | A Study on Modeling and Simulation of Hydraulic System for a Wheel Loader using AMESim | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정영규(테크노파워 코리아); 박성희(울산대학교); 정영만(울산대학교); 정찬세(울산대학교); 양순용(울산대학교)"
] | This contribution presents AMESim based hydraulic modeling and simulation program for a wheel loader. A wheel loader consists of variable displacement tandem axis piston pump which is load sensing control type along with maximum pressure regulator, and is operated by signals from joystick that control pilot pressure to spools of the main control valve(MCV). | 기계공학 | null | kci_detailed_000119.xml | |||
ART001445400 | oai_dc | 유압 구동계 에너지 재생 브레이크를 적용한 자동차 테일게이트 개폐장치에 대한 동특성 해석 | Dynamic Analysis on the Tail Gate System for Vehicle with the Energy Regenerative Brake of Hydraulic Driven Systems | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최순우(한국기술교육대학교); 허준영(한국기술교육대학교)"
] | 자동차의 테일게이트(Tail gate)및 후드(Hood)는 비교적 무거워 열 때는 힘들고, 닫을 시는 과속으로 닫히어 위험하다. 이에 따라 일반적으로 자동차 테일게이트에는 가스 리프터(Gas Lifter)를 장착한다. 가스리프터를 장착한 자동차 테일게이트 시스템은 사용에 있어서 여닫기가 불편하고 외부온도에 따라 여닫힘 성능이 달라지는 등의 문제가 있고 전기모터 구동방식을 취했을 경우에는 소음, 저응답성 등의 문제로 인하여 성능개선이 요구되고 있다. 이에 따라 고응답, 고동력밀도의 동력전달 시스템을 필요로 한다. 이러한 요구에 부응할 수 있는 동력전달 장치로는 일반적으로 유압시스템이 사용되고 있다. 동력전달의 제어성에 있어서는 유압시스템과 전기 시스템의 큰 차이점은 없지만, 유압시스템은 조작력, 고속응답, 동력밀도에서 매우 뛰어나다.
본 연구에서는 자동차의 테일게이트(Tail gate)개폐 시스템의 구동 동력원의 사양을 최소화 하기 위해서 운동관성에너지를 축압기에 저장하였다가 기동 시 사용하는 재생 브레이크 시스템에 대하여 축압기 용량선정에 대한 수학적 모델을 유도하고, 유공압 관련 상용 해석 소프트웨어인 아메심을 사용하여 모델링 및 시뮬레이션에 근거한 시행오차적인 방법으로 축압기 용량을 설계하는 방법 및 유압회생제동시스템을 자동차 테일게이트 개폐장치에 적용 하는 것에 대한 타당성을 검토 하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001445397 | oai_dc | 헤테로코어형 광파이버 압력센서개발을 위한 기초연구 | A Basic Study on Development of the Hetero-core Type Fiber Optic Pressure Sensor | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김영복(부경대학교)"
] | 파이버 센서는 원거리 다점계측이 가능하고 전자장노이즈에 강하기 때문에 주로 건축물이나 구조물의 노후화 및 자연재해에 따른 붕괴 등을 실시간으로 감시하기 위한 환경모니터링 시스템 구축용으로 주목 받고 있다. 일반적으로 전기식 스트레인 게이지가 건설현장을 비롯한 자연환경모니터링시스템 구축에 주로 사용되어지고 있지만, 수년 또는 수십년의 장기간에 걸친 환경모니터링에는 금속부식 및 전력손실 등의 문제 때문에 적합하지 않다. 이와는 달리 광파이버센서는 내부식성은 물론 전자장 등에 대해서도 거의 영향을 받지 않을 뿐 만 아니라, 가볍고 신호왜곡이 적어 장기수명이 요구되거나 고전압에 노출되어 있는 지하철 환경 등에서도 아무런 문제없이 사용할 수 있다. 그리고 광파이버선 자체를 센서 망으로 이용하면 원격 및 다점으로 분포계측이 가능하다.
광파이버선 자체가 센서기능을 하는 것으로는 BOTDR(Brillouin Optical Time Domain Reflecto -meter)나 FBG(Fiber Bragg Grating)등이 있다.1∼4) 이와 같은 센서는 각각 장단점을 갖고 있지만 정도, 시스템 구성조건, 가격 등의 면에서 아직 어느 것 하나 시장을 확보하고 있지는 못하다. 저자 등은 이와 같은 문제점을 해결하고자 헤테로코어형 광파이버센서를 처음으로 개발하여 수년간에 걸쳐 다양한 연구를 수행해 오고 있다.5∼11) 헤테로코어(Hetero-core)형 광파이버센서는 비교적 간단하고 큰 곡률 반경에 있어서도 전달손실이 발생하며 민감한 손실특성을 나타낸다. 또한 원리상 온도의존성이 거의 없어 온도보상이 필요 없는 것도 가장 큰 장점 중의 하나이다. 따라서 이러한 광파이버센서의 특징을 잘 이용하면 기존의 환경모니터링시스템 구축을 위한 목적뿐만 아니라 다양한 분야로의 적용도 가능하다. 예를 들어 압력센서 및 네트워크기반의 보안시스템으로의 확장도 가능하지만 기존의 광파이버센서가 갖는 여러 가지 단점을 보완하지 않으면 안 되는 문제도 다양하게 존재한다.
토목·건축분야 외 다른 목적으로 광파이버센서를 응용하고자 하는 연구개발 노력도 진행되어 적용된 예도 있다. 그 대표적인 것이 FBG이며 압력 및 온도계측용 센서가 개발되어 상용화 되어 있기도 하다. FBG는 물리적 변형 혹은 변위가 센서부에 가해지게 되면 광파이버를 통해 입력된 광신호의 후방산란광을 검출하고 변형이 가해지기 전의 파장과 비교분석하여 변위와 변형정도를 계측한다. 그러나 센서부의 최대 허용변위는 수 로 워낙 미소하기 때문에 변형에 따른 파장변화 또한 지극히 작다. 이러한 파장변화를 분석하기 위해서는 고가의 데이터로거가 반드시 필요하게 된다. 따라서 상용화 되어 있는 기존의 압력센싱시스템과 같이, 센서하나에 하나의 앰프로 이루어지는 단품형태의 시스템 구성은 가격 등 여러 가지 이유로 사실상 불가능하다는 것을 의미한다. 광파이버센서가 갖는 우수성에도 불구하고 특정한 분야 외는 아직 이렇다 할 적용 예를 찾아볼 수 없는 원인 중 하나가 이러한 이유 때문이기도 하다. 이와 달리 본 논문에서 소개하는 헤테로코어형 광파이버센서는 기존의 광파이버센서가 갖는 기술적인 우수성은 그대로 유지하면서, 압력센서 등의 단일 모듈형태의 센서개발에도 지극히 용이한 특성을 가지고 있다. 즉, 각종 새로운 센싱모듈 개발이 용이하고 신호처리상에서의 어려움이 없으며 기존 스트레인게이지와 같은 수준의 주의와 지식 ... | 기계공학 | null | kci_detailed_000119.xml | |||
ART001445399 | oai_dc | 대형차량용 사축식 유압 피스톤 펌프의 경전각 거동에 따른 실험적 해석 | Experimental Analysis to Behavior of Swivel Angle in Bent-axis type Oil Hydraulic Piston Pump for Heavy Vehicle | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"백일현(전북대학교); 조인성(전북대학교); 오석형(군산대학교); 장동혁(두산모트롤); 정재연(전북대학교)"
] | 최근 대형차량용 유압시스템은 성능, 환경, 소음 규제 등이 지속적으로 강화되고 있으며 이를 해결하기 위해 유압시스템의 소형경량화, 고속고압, 전자제어, 대체 오일, 소음저감 등에 대한 연구가 활발히 진행되고 있다. 이와 같은 기술동향은 유압시스템의 핵심동력원인 유압 피스톤 펌프도 예외는 아니다. 그 중에서도 사축식 액셜형 피스톤 펌프는 고속 고압화에 적합하고 가변용량형이 용이한 특징 때문에 건설중장비용 메인펌프로 사용되고 있다. 사축식 피스톤 펌프는 테이퍼 피스톤에 의해서 실린더블록이 구동되기 때문에 기하학적 메커니즘이 매우 복잡하여 관련된 연구사례가 극히 제한적이다. 이 분야에 대한 연구를 살펴보면 사축식 피스톤 펌프의 동적거동특성에 대한 연구1), 액시얼 피스톤 펌프의 성능에 관한 연구2), 액시얼 피스톤 펌프의 구동메커니즘3), 액시얼 피스톤 펌프의 마찰손실4) 등에 대한 연구 등이 있다.
본 연구는 로드 구동방식 사축식 피스톤 펌프의 구동메커니즘을 연구대상으로 하고 있다. 사축식 로드 구동방식 사축식 피스톤 펌프는 피스톤의 로드에 의해서 실린더블록을 구동하는 방식으로 피스톤 로드의 테이퍼 각도와 실린더블록과 회전축의 경전각이 매우 중요한 설계인자가 된다. 또한 디스크, 실린더블록, 피스톤 등을 가공할 때 설계도면과 공작기계에 의한 가공공차가 발생한다. 따라서 이와 같은 가공공차를 모두 고려할 경우 구동메커니즘은 매우 복잡해져 해석이 불가능 해진다. 그러므로 본 연구에서는 유압메이커가 공차관리에 어려움을 겪고 있는 디스크 구면부의 위치도의 변화에 따른 구동특성을 파악하고자 하였다. 디스크 중심의 위치도는 디스크 중심의 편심량을 의미하며 유압메이커의 대부분이 위치도에 대한 명확한 관리기준이 없기 때문에 이 분야에 대한 연구가 절실히 요구된다.
따라서 본 논문에서는 로드구동방식 사축식 피스톤 펌프의 피스톤 로드에 의한 구동메커니즘을 파악하고 디스크의 중심이 편심이 없을 때 피스톤 로드의 경전각과 피스톤의 구동영역에 미치는 영향에 대한 이론 및 실험적 해석을 수행하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001445398 | oai_dc | 차량 안정성을 고려한 인휠모터 방식 연료전지 전기자동차용 회생제동 알고리즘 개발 | Development of Regenerative Braking Control Algorithm for In-wheel Motor Type Fuel Cell Electric Vehicles Considering Vehicle Stability | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"양동호(성균관대학교); 박진현(성균관대학교); 황성호(성균관대학교)"
] | 최근, 수소를 연료로 하여 전기를 생산하는 연료전지에 관한 연구가 활발히 진행되면서, 친환경 고효율 차량인 연료전지 전기자동차(Fuel Cell Electric Vehicle; FCEV)에 대한 연구 또한 여러 분야에서 활발히 이루어지고 있다. 특히, 차량의 효율을 높이기 위한 많은 연구가 진행되고 있는데, 이 가운데 회생제동(regenerative braking)은 제동 시 마찰로 소모되는 운동에너지를 배터리, 울트라 커패시터(ultra-capacitor)와 같은 에너지 저장장치에 저장하여 이를 구동 시 다시 이용하는 기술로, 전기자동차, 연료전지 전기자동차 또는 하이브리드 전기자동차의 연비 개선을 위한 핵심적인 분야로 연구되고 있다. 한편, 최근 자동차 시장은 연비와 동력 성능뿐만 아니라 우수한 차량 안정성을 갖춘 첨단 지능형 차량의 개발을 요구하고 있다. 차량의 안정성 확보를 위해 현재 많은 기술들이 개발되어 있으며, 대표적으로 ABS(Anti -lock Braking System), TCS (Traction Control System), VDC(Vehicle Dynamics Control), ASC (Active Steering Control) 등의 능동안전(active safety) 시스템 등이 연구되어 왔다. 이는 차량의 주행 시 사고를 예방함과 동시에 운전자에게 편의와 신뢰성을 제공하는 기술로써, 세계 각국에서 연구가 이루어지고 있다.
본 논문에서는 연료전지 차량의 안정성을 고려한 회생제동 알고리즘을 제안하였다. 알고리즘 검증을 위해 MATLAB/Simulink기반 연료전지 차량 시뮬레이터를 개발하였으며, 개발된 연료전지 차량 시뮬레이터를 활용하여 알고리즘 검증을 수행하였다. 연료전지 차량 시뮬레이터는 제어기 모델과 플랜트 모델 및 차량 모델로 이루어져 있으며, 여기서 차량 모델의 경우 차량 동특성 해석 시뮬레이션에 많이 사용되는 CarSim 프로그램을 이용하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001428947 | oai_dc | 로드셀과 토크암을 이용한 대용량 토크 측정장치 개발에 관한 연구 | Development of device measuring very high torque via torque arm with attached load cells | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이용범(한국기계연구원); 한승호(동아대학교)"
] | 회전축의 토크를 측정하기 위한 가장 일반적인 방법은 토크미터를 축의 길이 방향으로 설치하여 이에 장착되어 있는 스트레인 게이지로부터 얻어지는 신호를 토크로 환산하는 것이다. 이러한 방법은 저용량의 토크가 요구되는 동력전달 장치인 감속기의 기계적 효율의 계측과 검증에 효과적으로 활용되고 있다.
그러나, 대표적인 건설장비인 대형 굴삭기 또는 크레인 그리고 풍력발전기의 증속기 등에 활용되는 유성기어 방식의 동력전달 장치의 성능평가를 위해 대용량 토크측정이 요구된다. 기존의 토크미터를 이용하여 대용량 토크를 측정하는 경우, 다음과 같은 문제점이 있다. 즉, 고가의 대형 토크미터를 구입해야 하는 점과 토크미터와 연결되는 커플링의 길이가 길어지고, 중량도 많이 나가 실험을 위한 설치공간의 제약 및 작업효율이 매우 낮아지는 문제점 등이다.
본 연구에서는 유성기어박스의 구조적 특성을 이용하여, 부하 및 시험용 기어박스 각 한 쌍을 서로 맞대어 컨넥터로 연결하고 이를 볼베어링으로 지지하여 유성기어 2단 케리어를 통해 전달되는 대용량 토크를 토크암과 로드셀로 측정하는 방식을 제안하였다. 이때, 토크는 케리어와 연결된 토크암의 길이와 각각의 암의 끝단에 장착된 로드셀로부터 얻어지는 힘을 고려하여 측정된다. 상기 제안된 측정방식의 신뢰도는 자체 제작된 기계식 동력순환 기어박스 시험장치(mechanical feedback type test device)에서 실제 조건에 맞추어 실험을 수행하여 계측된 토크 값의 신뢰도로 검증하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001428955 | oai_dc | 대용량 비례 유량제어밸브 동특성 분석 | Dynamic Characteristics of Proportional Flow Control Valve with Large Capacity | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | 비례제어밸브는 코일에 흐르는 전류에 비례하여 발생되는 전자기력(electromagnetic force)을 이용해서 밸브를 작동시키는 구조를 갖으며, 고압 대용량의 공정유체를 제어하는 경우에는 압력과 유체 흐름에 의하여 밸브에 작용하는 외력을 보상할 수 있는 큰 구동력의 증폭을 위하여 파일럿 밸브를 이용하는 2단 밸브 형태로 설계된다.
대용량 비례유량제어밸브는 솔레노이드가 밸브에 내장되므로 공압작동밸브(air-operated valve)나 모터작동밸브(motor-operated valve)와 달리 파일럿 밸브를 작동시키기 위하여 외부와 연결되는 액추에이터가 없어 패킹이 필요 없는 밀봉된 설계와 구동부의 소형화가 가능하다는 구조적인 특징 외에 동적 작동성능이 우수하고 사용시간에 따른 성능저하가 상대적으로 작으므로 유지보수비용이 절감되는 장점으로 인하여 화력 및 원자력발전소, 정유공장에서의 긴급급수밸브 등과 같이 위급한 상황에서 작동되어야 하는 분야에 점차 적용이 확대되고 있다. 특히 비례제어밸브 제어기(positioner)는 파일럿 밸브 변위를 선형변위계로 측정하여 피드백하는 폐루프 제어시스템을 통하여 밸브의 빠른 응답성과 히스테리시스(hysteresis)가 거의 없는 정밀한 위치제어가 가능할 뿐만 아니라 마이크로 컨트롤러를 이용한 디지털 방식의 전자제어를 활용해서 전원, 센서, 솔레노이드 코일 등의 단선과 단락 등을 검출하는 자기진단기능과 디지털 통신을 이용한 원격제어 및 모니터링 기능이 구현된 스마트밸브로 개발되고 있다.
2단 비례유량제어밸브는 유체가 흐르는 유로단면적을 조절하는 기능의 메인 밸브와 메인 밸브변위를 조절하는 기능의 파일럿 밸브로 구성된다. 파일럿 밸브는 솔레노이드에서 발생되는 전자기력으로 변위가 제어되고 메인 밸브는 파일럿 밸브에 대한 상대변위에 따라 자체적으로 조절되는 제어체임버 압력에 의하여 파일럿 밸브를 추종하는 자력제어시스템(self- controlled system)의 구조를 갖는다. 따라서 메인 밸브의 응답성과 안정성은 자력제어시스템의 기계적 설계인자에 의하여 결정된다.
본 논문에서는 연구대상 대용량 비례유량제어밸브의 구조와 작동원리를 파악하였으며, 정상상태 작동특성에 대하여 수행된 연구결과를 바탕으로 자력제어시스템의 동특성을 고찰하였다. 동적해석은 비선형 수학적모델을 선형화해서 유도된 전달함수를 이용하였고 설계인자 변화에 대한 극점(pole)의 변화로부터 응답성능과 안정성을 해석하였으며 선형해석 결과는 비선형 시뮬레이션을 통하여 검증하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001428944 | oai_dc | 레이디얼 피스톤 펌프의 피스톤 접촉 메커니즘 개발 | Development of piston contact mechanism for radial piston pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"함영복(한국기계연구원); 차재곤(한국기계연구원); 김대명(한국기계연구원); 공태우(한국기계연구원); 윤소남(한국기계연구원); 안국영(한국기계연구원); 권병수(광신기계공업(주))"
] | 수소압축기는 무급유 방식의 왕복동식과 무윤활 방식의 메탈 다이아프램 방식으로 양분되며, 각 방식에 따라 수소의 순도와 충진압에서 일장일단의 특성을 나타낸다.
메탈 다이아프램 수소압축기는 유압구동부의 누설유량과 흡입 시 발생하는 캐비테이션 방지를 위한 과급유 상태를 유지할 수 있도록, 피스톤 챔버와 오일 헤드 챔버에 오일을 보충하게 된다. 이러한 목적으로 오일보충용 펌프는 압축기의 크랭크케이스 내부의 메인 크랭크샤프트에 연결하여 구동하게 된다.
본 연구에서는 메탈 다이아프램 수소압축기의 오일 보충용 펌프로 개발된 레이디얼 피스톤 펌프의 피스톤을 스틸 볼이 볼 레이스 위를 구름 접촉하도록 구성하고 볼이 설치된 피스톤 끝면 윤활용 오리피스를 설치하고 서로 다른 오리피스 직경에 대해 실험적으로 비교 평가하고 개발된 펌핑 메카니즘의 구조적 타당성을 검토해 본다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001428951 | oai_dc | 가스보조식 이중행정 유압브레이커의 성능 최적화 | Performance Optimization of a Gas-Assisted Hydraulic Breaker with Dual Stroke | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"류택직(고려대학교); 장효환(고려대학교)"
] | 가스보조식 유압브레이커는 굴삭기에서 공급되는 유압에너지와 유압브레이커 상부에 있는 백헤드가스실의 공압에너지를 피스톤의 운동에너지로 변환하고, 변환된 운동에너지는 툴(tool)을 통하여 타격물에 전달되어 타격물을 파쇄하는 기계장치이다. 이중행정(dual stroke)유압브레이커는 긴 행정과 짧은 행정으로 구성되어 있으며, 긴 행정은 큰 타격에너지를 필요로 하는 단단한 지반에, 짧은 행정은 큰 타격수를 필요로 하는 무른 지반에 사용된다. 가스보조식 유압브레이커에 대한 연구는 상당수 진행되었지만, 체계적인 설계변수 민감도 해석과 이중행정을 고려한 성능향상에 대한 연구는 없는 실정이다.
본 연구에서는 가스보조식 이중행정 유압브레이커에 대하여 수학적 모델을 수립하고 AMESim을 이용한 시뮬레이션에 의해 성능을 해석하였으며, 실험을 통해 타당성을 검증하였다. 민감도해석을 통하여 유압브레이커의 설계변수들이 성능에 미치는 영향을 규명하고 주요 설계변수들을 추출하였다. Taguchi 방법을 적용하여 유압브레이커의 출력을 최대화하는 설계변수들의 최적값을 구하였고 기존설계와 성능을 비교하였다. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001393192 | oai_dc | 필드로봇용 원격 굴삭 시스템의 궤적제어에 관한 연구 | A Study on Tracking Control of Remote Operated Excavator for Field Robot | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"양순용(울산대학교); 진성민(울산대학교); 최정주(동아대학교); 이창돈(울산대학교); 김용석(울산대학교)"
] | Hydraulic excavators are the representative of field robot and have been used in various fields of construction. Since the excavator operates in the hazardous working environment, operators of excavator are exposed in harmful environment. Therefore, the hydraulic excavator automation and remote operation system has been investigated to protect from the hazardous working environment. In this paper, remote operation excavator system is developed using the mini hydraulic excavator and the tracking control system of each links of excavator is designed. To apply the tracking control system, the adaptive sliding mode control algorithm is proposed. It is found that the performance of the proposed control system is improved through experimental results of using the remote operation excavator system. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001393194 | oai_dc | 전후진 파워시프트 변속기 유압 제어 시스템 해석 | Analysis of Hydraulic Control System for Shuttle Power-shift Transmission | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김대철( 동양물산기업(주))"
] | The major system of an agricultural shuttle power-shift tractor is the transmission, using power-shift. Because the shifting performance depends on the hydraulic control system, the most important aspect of the optimization is the design of the hydraulic control system. This study was conducted to develop the simulation model of hydraulic control system for the shuttle power-shift transmission by using Easy5 software. Bench test was conducted to verify the simulation. Also, the design parameters which influence the pressure modulation characteristics were investigated. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001393195 | oai_dc | 밸브 구동용 개폐식 솔레노이드 액추에이터의 설계 | A Design of On/Off Type Solenoid Actuator for Valve Operation | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"성백주(한국기계연구원)"
] | For a design of on/off solenoid actuator for valve actuating, designer must have the experimental knowledge as well as general electromagnetic formulas to design object. It is possible for theoretical knowledge to do the out-line design, but it is impossible to optimal design without experimental knowledge which only can be achieved through many repeated experiments. In addition, in present on/off type solenoid actuator field, the smaller, lightening, lower consumption power, high response time are effected as the most important design factor. So, experimental knowledge is more needed for optimal design of solenoid actuator. In this study, we derived the governing equations for optimal design of on/off solenoid actuator for valve actuating and developed a design program composed electromagnetic theories and experimental parameter values for inexperienced designers. And we proved the propriety of this program by experiments. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001393187 | oai_dc | 작업장치 위치에너지 회생을 위한 하이브리드 굴삭기 시스템 개발 | Development of Hybrid Excavator for Regeneration of Boom Potential Energy | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"윤종일(울산대학교); DINH QUANG TRUONG(울산대학교); 강종민(울산대학교); 김재홍((주)볼보그룹코리아); 안경관(울산대학교)"
] | Nowadays with the high fuel prices, the demands for energy saving and green emission of construction machinery have highly been increased without sacrifice of working performance, safety and reliability. The aim of this paper is to propose a new energy saving hybrid excavator system using an electro-hydraulic actuator driven by an electric motor/generator for the regeneration of potential energy. A 5 ton class excavator is analyzed, developed with the boom for the evaluation of the designed system. The hardware implementation is also presented in this paper. A control strategy for the hybrid excavator is proposed to operate the machine with a highest efficiency. The energy saving ability of the proposed excavator is clearly verified through simulation and experimental results in comparison with a conventional hydraulic excavator. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001346133 | oai_dc | 서브머지드 카고 펌프 시스템용 유량제어밸브의 특성 | Characteristics of a Flow Control Valve for a Submerged Cargo Pumping System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이일영(부경대학교); 이동렬((주)보쉬렉스로스코리아); 박형호(STX엔파코(주) 기술연구소); 최세령(부경대학교)"
] | This study specifies the flow control characteristics of a flow control valve(FCV) in a submerged cargo pumping system through experiments and simulations. In the experiments, the functions of the major components of the FCV in relation to the FCV's flow characteristics are presented clearly. Through the simulations, it is shown that the simulation program suggested in this study can be utilized for the design of the FCV. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001346128 | oai_dc | 보조동력장치 연료 공급용 서보밸브 토크모터의 기초 수치모사 연구 | Priliminary Numerical Simulation of the Torque Motor for a Servo Valve in the Fuel Supply System of APU | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장세명(군산대학교); 정헌술(군산대학교); 양인영(한국항공우주연구원); 이원중(한국항공우주연구원); 장강원(군산대학교)"
] | The APU(Auxiliary Power Unit) needs a set of complex pipeline for the fuel supply system where some of the main valves controlling the flow rate consist of the servo valve worked with a torque motor. The input electric current produces an induced magnetic field almost perpendicular to the background magnetic filed generated by fixed permanent magnets. The induced torque deforms the tubular bushing, and directly rotates an armature, which can open and close the valve. In this study, we start from a basic analytic model using a simple electro-magneto-statics, and expand our model to the three-dimensional one computationally applying a commercial code named COMSOL. The result is compared with each other, and reasonable numerical data are obtained for the dynamic behavior and multi-physics system. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001346139 | oai_dc | 유압실린더 힘 제어계의 인-프로세스 서보밸브 마모진단에 관한 연구 | In-Process Diagnosis of Servovalve wear in Hydraulic Force Control Systems | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성동(금오공과대학교); 전세형(금오공과대학교); 장영배(Oklahoma State University)"
] | An in-process method of diagnosing the spool wear of hydraulic servovalves was explored. The diagnostic method discussed in this paper is for force-control hydraulic servo systems. The key principle used is that pressure sensitivity of a servovalve drops as the valve spool wears out so that it is possible to determine the spool condition by monitoring pressure sensitivity. A diagnostic algorithm was developed and evaluated through numerical simulation and experiments. Two major steps of diagnosis are the evaluation of null bias of the servovalve and the approximation of pressure sensitivity, both of which could be successfully done during normal operation of a servo system. The difference between a new servovalve and a worn valve could be clearly detected in-process, and the diagnostic test was found to be repeatable. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001346136 | oai_dc | 래크바형 수문권양기에 적용된 정유압장치의 컴퓨터 시뮬레이션에 의한 작동특성 연구 | Computer Simulation Study of the Hydrostatic Transmission Applied to the Rack-Bar Type Sluice Gate | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이성래(건양대학교)"
] | The typical hydraulic hoisting system of the rack-bar type sluice gate is composed of a hydraulic supply unit using an uni-directional pump, a direction control valve, a hydraulic motor, a counter balance valve, and flow control valves. Here, the hydrostatic transmission is applied to the hoisting system of rack-bar type sluice gate to simplify the operation of gate such that the upward and downward direction of gate is simply controlled by the direction of pump rotation. The new hydraulic hoisting system is composed of a bi-directional pump, a hydraulic motor, two counter balance valves, two check valves, two pilot-operated check valves, two relief valves and a shuttle valve. The characteristics of a suggested system are analyzed by computer simulations. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001375515 | oai_dc | 속도제어-정용량 펌프를 사용하는 실린더-부하계의 에너지절약-부하감지형 경로제어 | Path Control with Energy-Saving Load-Sensing for a Cylinder-Load System Using Speed-Controlled Fixed Displacement Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조승호(홍익대학교)"
] | This paper deals with the issue of robust position tracking control and energy-saving control for a valve-controlled cylinder system using speed-controlled fixed displacement pump. The whole feedback control system is composed of a pair of interconnected subsystems, that is, valve-controlled cylinder system and load-sensing control system. From experiments it is shown that position tracking control in the load sensing control system can accomplish significant reduction in input energy to pump comparing to a conventional valve-controlled cylinder system, while exhibiting the same position tracking control accuracy. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001375512 | oai_dc | 파워시프트 변속기 유압시스템의 PWM 제어 실험 연구 | Experimental Investigation on PWM control of Power-shift Transmission Hydraulic System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김대철( 동양물산기업(주)); 이재규(동양물산기업); 강영선(동양물산기업); 이재천(계명대학교)"
] | The major system of an agricultural power-shift tractor is the transmission, using power-shift. Because the transmission performance depends on the hydraulic control system, the most important aspect of the optimization is the design of the hydraulic control system. This study was conducted to improve a pressure modulation characteristics of the power-shift transmission hydraulic system. It has been tried to replace an existing pressure modulation method with a digital control by using HSSV(High Speed Solenoid Valve). The performance of the PWM control system in power-shift hydraulic transmission has been evaluated by means of experiment. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001375517 | oai_dc | 건설중장비용 카운터샤프트 자동변속기 기어열 레이아웃 설계 | Design of Counter Shaft Automatic Transmission Gear Train Layout for Construction Vehicles | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교)"
] | Counter shaft transmission is a popular automatic transmission power train in construction vehicles such as wheel loader and forklift. The gear train layout of counter shaft transmission is a very basic and important development stage because it affects the most of components design including hydraulic system and shift control algorithm, etc. This paper presents a design methodology for the gear train layout from the analysis of power flow path and clutch hook-up of the existing counter shaft transmission that is adopted in commercialized construction vehicles. Also, independent constraints for the meshed gear ratios are derived in order to realize forward 4-speed and reverse 3-speed gear ratio. The layout design principle proposed here was applied to the new original counter shaft transmission that is underdevelopment. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001375509 | oai_dc | 사판식 피스톤형 유압펌프에서의 실린더내 압력, 맥동, 소음에 관한 실험적 연구 | A Study on Pressure, Flow Fluctuation and Noise in the Cylinder of Swash Plate Type Axial Piston Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장동혁(두산모트롤); 이상규(두산모트롤); 박성환(부산대학교); 권정호(두산모트롤)"
] | Noise reduction for hydraulic pump is strongly demanded in the market with its efficiency and durability. In order to meet this demand, it is necessary to reveal mechanism for noise and relationship between the important factors. In this paper, mathematical model for cylinder pressure which is primary reason of pulsation and sound noise were established, and examined its pressure profile by simulation. Also, the valve plate of three kind types are manufactured and tested for piston pressure, pressure pulsation, and sound power level based on the tentative standard which is officially recognized. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001322931 | oai_dc | 튜너 내장 자동차 조향호스의 해석 모델과 실용적 응용 | On the Analytical Model of Automotive Steering Hoses Containing Tuner and Its Practical Application | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이재천(계명대학교); 오상흔(평화산업(주) 기술연구소 )"
] | This study presents an analytical model of an automotive steering hose containing tuner(flexible spiral metal tube) to reduce the ripple pressure induced by steering vane pump. The double-wall side branch composed in a steering hose containing tuner was analogically considered as a filter in a conduit. Specialized test equipment was manufactured for the estimation of speed of sound in a conduit and measurement of amplitude ratio between the propagated ripple pressures of inlet and outlet of the steering hose. Experimental data of entire frequency ranges can be obtained through the test once in short time. The results of three points' measurement method and cross-correlation method to estimate the speeds of sound in a hose, tuner, and side branch respectively reveal that cross-correlation method can be used practically. The results of simulation and experiment were so close, especially in the range of engine idling speed, that the proposed analytical model in this study was validated. Sensitivity analyses and experiments show that longer tuner is preferable, and that the positive-positive composition of the steering hoses containing tuner is superior to others to attenuate ripple pressure. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001322936 | oai_dc | 일체형 순수유압식 브레이커의 민감도해석에 의한 성능 향상 | Performance Improvement of an Integrated-type Fully-Hydraulic Breaker by Sensitivity Analysis | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최석(고려대학교); 장효환(고려대학교)"
] | The performance improvement of a small-size integrated-type fully hydraulic breaker is studied in this paper. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected and nearly optimized to maximize the impact energy as well as to improve the dynamic characteristics such as the piston upper chamber pressure, piston and valve displacements. As a result, the impact energy, blows per minute(bpm) and output power are increased by 52.9%, 1%, and 55.6%, respectively compared with the current design. The dynamic characteristics of the piston upper chamber pressure, piston and valve displacements are also improved by the design change. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001322934 | oai_dc | 자동변속기 오일 소요유량 시험법개발 및 측정데이터 분석 | Development of the Oil Consumption Rate Test Method and Measurement Data Analysis for an Automatic Transmission System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정헌술(군산대학교); 오석형(군산대학교); 이재신(현대자동차); 임진승(현대자동차)"
] | Automatic power transmission systems consisted of a torque converter and several planetary gear sets, clutches and brakes are controlled by a hydraulic shift control circuit and an electronic transmission control unit. The hydraulic circuit serves for the operation of the torque converter and lubrication oil supply of the transmission system as well as for the actuation of clutches for the automatic gear shift. The complicated hydraulic control circuit constructed by many spools, solenoids, orifices and flow passages are integrated into one small valve block and it is powered by one hydraulic pump. In this paper, a test equipment was developed to measure the oil consumption of each component at various wide operating conditions. Test data about 730 sets acquired from five test items are analyzed and discussed on the oil capacity of the circuit. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001322938 | oai_dc | 파워시프트 변속기 유압클러치시스템의 해석적 연구 | An Analytical Investigation of a Hydraulic Clutch System of Powershift Transmission | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이재천(계명대학교)"
] | This study presents an analytical model of hydraulic clutch system of a power shift transmission to analyze pressure modulation characteristics. A typical hydraulic clutch system was modeled by using AMESim in which the parameters of major components were measured for simulation. Test apparatus was established using the components of power shift and power shuttle clutches with instrumental equipment. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the cylinder model analogized clutch dynamics need to be improved in future study. The effects of parameters of orifice diameter, accumulator stroke and oil temperature on pressure modulation were analyzed respectively. The results of parameter sensitivity analysis show that modulation time and set pressure can be easily adjusted by changing parameter values. It is also found that the hydraulic clutch system used in this study is so susceptible to oil temperature that cooling equipment is necessary. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001295814 | oai_dc | 전기-정유압 구동식 사출성형 실린더의 운동제어 | Motion Control of Injection Moulding Cylinder with Electric-Hydrostatic Drives | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조승호(홍익대학교)"
] | This paper deals with the issue of position tracking control of a clamp-cylinder for injection moulding machine with electric-hydrostatic drives. A fixed displacement pump is utilized in combination with AC motor in order to directly control a clamp-cylinder. A clamp-cylinder may be required to operate under a variety of operating conditions. Therefore, robust control performance is important in position tracking control applications. In order to accommodate mismatches between the real plant and the model used for controller design, discrete-time sliding mode control is developed by combining a velocity feedforward loop. From tracking control experiments, it is shown that significant reduction in position tracking error is achieved through the use of sliding mode control. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001295815 | oai_dc | 지능형 굴삭 시스템의 버킷 끝단 위치제어에 관한 연구 | A Study on the Bucket Tip's Position Control for the Intelligent Excavation System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김기용(두산인프라코어); 장달식(두산인프라코어); 안현식(두산인프라코어)"
] | For the bucket tip position control of the excavator, a traditional hydraulic excavator system was exchanged into an electro-hydraulic one. EPPR valves are attached to the traditional MCV and hydraulic joysticks are replaced by electronic ones to develop the electro-hydraulic system. To control the electronic pump with a good performance, the control logic for the pump is deduced from the AMESim simulation and the experimental method on the test bench. To get a good position control performance of the excavator bucket tip, PI+AntiWindup controller is selected as a position controller. The experimental results showed the good controllability for the electro-hydraulic excavator system on the test bench. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001295813 | oai_dc | 자동차 공기현가 공압회로 해석 및 대체회로 설계 | Analysis and Alternative Circuit Design of Pneumatic Circuit for An Automotive Air Suspension | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이재천(계명대학교)"
] | This study presents an analytical model of the pneumatic circuit of an air suspension system to analyze the characteristics of vehicle height control. The analytical model was developed through the co-simulation of Simulink(air spring) and HyPneu(pneumatic circuit). Variant effective area of air spring and flow coefficients of pneumatic valves were estimated experimentally prior to the system test, and utilized in simulation. One-corner test apparatus was established using the components of commercial air suspension products. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the frictional loss of conduit and heat dissipation which were ignored in this study need to be considered in future study. As an application example of proposed analytical model, an alternative pneumatic circuit of air suspension to conventional WABCO circuit was evaluated. The comparison of simulation results of WABCO circuit and alternative circuit show that proposed analytical model of co-simulation in this study is useful for the study of pneumatic system of automotive air suspension. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001295812 | oai_dc | 보조 동력 장치 연료 공급용 서보밸브의 유동 특성 해석 | Flow Characteristics of the Servo Valve in the Fuel Supply System of APU | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성수(군산대학교); 정헌술(군산대학교); 류혁(한국항공우주연구원); 이상효(국방과학연구소); 장세명(군산대학교)"
] | In this paper, the authors benchmark a servo valve model for the fuel supply system of Auxiliary Power Unit (APU) in the KHP helicopter. This valve is directly driven with a torque motor, and the size of small gap controlled by a flapper can make change of flow rate under given pressure drop between inlet and outlet. CFD analyses using a commercial code, ANSYS‐CFX 10 are performed for the series of three-dimensional models at various openness conditions. The computational results on simplified models show that CFD can play a fine roll in the design of flow path as well as in the estimation of flow force due to its precision and good repeatability. Consequently, the CFD analysis helps valve designers to understand its flow characteristics from the basis of physical fundamentals. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001295810 | oai_dc | 회생제동 전자제어 유압모듈을 이용한 하이브리드 차량의 에너지 회수 알고리즘 개발 | Development of Energy Regeneration Algorithm using Electro-Hydraulic Braking Module for Hybrid Electric Vehicles | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"여훈(현대모비스); 김현수(성균관대학교); 황성호(성균관대학교)"
] | In this paper, an energy regeneration algorithm is proposed to make the maximum use of the regenerative braking energy for a parallel hybrid electric vehicle(HEV) equipped with a continuous variable transmission(CVT). The regenerative algorithm is developed by considering the battery state of charge(SOC), vehicle velocity and motor capacity. The hydraulic module consists of a reducing valve and a power unit to supply the front wheel brake pressure according to the control algorithm. In order to evaluate the performance of the regenerative braking algorithm and the hydraulic module, a hardware-in-the-loop simulation (HILS) is performed. In the HILS system, the brake system consists of four wheel brakes and the hydraulic module. Dynamic characteristics of the HEV are simulated using an HEV simulator. In the HEV simulator, each element of the HEV powertrain such as internal combustion engine, motor, battery and CVT is modelled using MATLAB/SimulinkⓇ. In the HILS, a driver operates the brake pedal with his or her foot while the vehicle speed is displayed on the monitor in real time. It is found from the HILS that the regenerative braking algorithm and the hydraulic module suggested in this paper provide a satisfactory braking performance in tracking the driving schedule and maintaining the battery state of charge. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001275820 | oai_dc | 3축 로드 시뮬레이터 개발 | Development of 3-axis Road Simulator | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"최경락(한국생산기술연구원); 전승배(JKS㈜); 황성호(성균관대학교)"
] | The road simulators have become common tools within the automotive industry for evaluation of vehicle and vehicle system durability performance. These simulators need appropriate input signal generation algorithms to realize the actual driving conditions due to non-linear vehicle and test rig behaviour. Although somewhat unconventional from a control standpoint, the iteration approach has proven to be a very effective method for control of complex, multiple degree-of-freedom systems where the tracking parameter is known a priori. In this paper, the road profile replication algorithm is verified by applying Belgian road to the developed road simulator. The simulation and experimental results are included to evaluate the performance of this simulator. This road simulator provides considerable savings in cost, development time, and testing risk during developing automotive components. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001275816 | oai_dc | Taguchi 방법을 이용한 순수 유압식 브레이커의 성능 최적화 | Performance Optimization of a Fully Hydraulic Breaker using Taguchi Method | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"곽광순(고려대학교); 장효환(고려대학교)"
] | The optimal design of a large-size fully hydraulic breaker is studied in this paper. Mathematical modeling of the breaker is established and verified by experiments. Through sensitivity analysis, the key design parameters of the breaker are selected, which mostly affect the performance of the breaker. Taguchi method is used to optimize the key design parameters in order to maximize the output power through simulation using AMESim. As a result, the impact energy is increased by 18.9% and the output power is increased by 12.4% compared with the current design. The pressure pulsation in the supply line is also reduced by the optimization. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001275817 | oai_dc | 굴삭기를 이용한 돌쌓기 장치 개발 | Development of Stone Piling-up Device for an Excavator | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"권순광(울산대학교); 김용석(울산대학교); 이동영(울산대학교); 이창돈(울산대학교); 양순용(울산대학교)"
] | The application of an excavator can be expanded to various works through change of end-effector. In this paper, a gripper, which can pick up and rotate a fixed formal stone, was developed. The device was designed and produced to pick up and rotate a stone for an excavator. The maximum weight of stone was computed to prevent from reversal in according to each displacement of attachments. The necessary force of a hydraulic cylinder to grip a stone was obtained by simulation | 기계공학 | null | kci_detailed_000119.xml | |||
ART001259785 | oai_dc | 유압 스풀밸브 그루브 내에서의 유동특성 해석 | Analysis of Flow Characteristics in a Groove of Hydraulic Spool Valve | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박태조(경상대학교)"
] | All of the hydraulic spool valves adopt radially grooved spools to avoid hydraulic locking. In this paper, a commercial computational fluid dynamics (CFD) code, FLUENT is used to investigate the accurate Poiseuille flow characteristics inside single groove. The stream lines, velocity and pressure distributions are obtained for various groove widths, depths and shapes. The stream lines are highly affected by groove shape and there occurred large vortexes inside groove beyond a certain ratio of groove width to depth. Especially the U shaped groove restrains the occurrence of vortex. Therefore the numerical method adopted in this paper can be use in optimum designing of multi-grooved hydraulic spool valves. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001259786 | oai_dc | 유압식 착암기 치즐의 타격 변형량 해석에 관한 연구 | A Study On the Analysis Of Impact Strain for Hydraulic Breaker Chisel | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박종원(한국기계연구원); 이기욱(한국기계연구원); 김형의(한국기계연구원)"
] | A hydraulic breaker for construction machinery generally used for the destroying and disassembling of buildings, crashing road pavement, breaking rocks at quarry and so on. So the measurement of the impact energy of a hydraulic breaker is very important thing to prove its capability to manufacturers and customers. Therefore the prediction of impact energy in design process is very helpful to the most of breaker manufacturers. In this study, we carried on modeling and simulation of a hydraulic breaker to predict impact energy via commercial CAE software. The modeling and simulation of a hydraulic breaker was achieved with two parts. One is a hydraulic circuit analysis part via AMESim and the other is impact strain analysis part via ANSYS. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001259784 | oai_dc | 스위칭 제어 모드를 이용한 유압펌프의 유량/압력/동력 제어 | Flow/Pressure/Power Control of Hydraulic Pump UtilizingSwitching Control Mode | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정동수(한국기계연구원); 김형의(한국기계연구원)"
] | The electro-hydraulic pump is usually used in testing equipments which require one control function. But until now, it is not applied to industrial equipments which are exposed to severe working environment and require various control functions. This paper proposes a technique which controls continuously flow, pressure and power by utilizing switching control mode. Mathematical model is developed from the continuity equation for the pressurized control volume and the torque balance for the swash plate motion. To simplify the model we make the linear state equation by differentiating the nonlinear model. We analyze the stability and disturbance by using the state variable model. Finally, we review the control performances of flow, pressure and power by tests using PID controller. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001259783 | oai_dc | 보조 동력장치용 서보밸브 유효 오리피스 면적의 칼만필터 추정 | Kalman Filter Estimation of the Servo Valve Effective Orifice Area for a Auxiliary Power Unit | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장지팡(군산대학교); 김춘택(항공우주연구원); 정헌술(군산대학교)"
] | Flow rate is one of the important variables for precise motion control and detection of the faults and fluid loss in many hydraulic components and systems. But in many cases, it is not easy to measure it directly. The orifice area of a servo valve by which the fluid flows is one of key factors to monitor the flow rate. In this paper, we have constructed an estimation algorithm for the effective orifice area by using the model of a servo valve cylinder control system and Kalman filter algorithm. Without geometry information about the servo valve, it is shown that the effective orifice area can be estimated by using only displacement and pressure data corrupted with noise. And the effect of the biased sensor data and system parameter errors on the estimation results are discussed. The paper reveals that sensor calibration is important in accurate estimation and plausible parameter data such as oil bulk modulus and actuator volume are acceptable for the estimation without any error. The estimation algorithm can be used as an useful tool for detecting leakage, monitoring malfunction and/or degradation of the system performance. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249251 | oai_dc | 원통다관식 열교환기의 압력 변화에 따른 설계 응력 연구 | Study upon Design Stress due to Pressure of Shell-and-Tube Type Heat Exchanger | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이용범(한국기계연구원); 한성건(한국기계연구원); 고재명(한국기계연구원)"
] | Shell-and-tube type heat exchangers are generally classified with fixed tube-sheet and floating tube-sheet heat exchangers. In this paper, we employed the fixed tube-sheet heat exchangers. We theoretically investigated the safety evaluation of our shell-tube heat exchanger by axial, bending and equivalent stress of fin tubes, tube plates, channels and shell. Design pressure ranges were chosen pressure(0.6～2 MPa) on tube side and 200 %(3 MPa) of Maximum pressure on shell side for safety evaluation of heat exchangers. This research will be useful for fabrication of heat exchangers to prevent against damage hazard of heat exchangers in operation. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249253 | oai_dc | 슬라이딩 모드제어에 의한 유압 현가시스템의 설계변수 민감도 해석 | A Parameter Sensibility Analysis of a Hydraulic Suspension System Using a Sliding Mode Control | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김주용(우송대학교)"
] | The most vehicle active suspension system is activated by a hydraulic source and transmission system which has nonlinear characteristics. Even though we have designed a proper controller for this system, it sometimes cannot show remarkable performance characteristics because of many factors that undercut the performance of the hydraulic system, such as nonlinearity, modelling errors, parameter variations etc. So, the robust controller that prevents a system from lowering its performance is needed. In this study, the sliding mode control which is the representative one of robust controllers is adopted to investigate system parameter sensibility. As a result, the sliding mode controller shows robustness to the system parameters variations relative to the other controllers. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249252 | oai_dc | 유압실린더의 쿠션링 형상에 따른 쿠션 특성 연구 | Study of The Cushion Characteristics in accordance with Shapes of Cushion Ring of Hydraulic Cylinder | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이용범(한국기계연구원); 고재명(한국기계연구원); 박종호(충남대학교)"
] | Hydraulic excavator consists of booms, arms, bucket, and cylinder. The cylinder make these structures moved and the cushion parts of cylinder in operation absorb the great impact which is stemmed from high velocity and pressure at cushion parts of cylinders. The cushion technology of cylinders has a great effect on the operator's comfortable as well as protecting equipment from damage by suppressing the inertia of the hydraulic excavator.In this study, three hydraulic cylinders have different shapes of a cushion ring, respectively. we studied optimal cushion pattern by analyzing the change of cushion pressure and time, according to supply pressure and velocity variations. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249250 | oai_dc | 사축식 유압 피스톤 펌프의 디스크 편심률에 따른 실린더블록 구동영역에 대한 연구 | A Study on Driving Range of Cylinder Block to Eccentricity Ratio of Disk in Bentaxis Type Oil Hydraulic Piston Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정재연(전북대학교); 백일현(전북대학교); 조인성(전북대학교); 송규근(전북대학교); 오석형(군산대학교); 정용욱(동명모트롤)"
] | To improve the performance of the bentaxis type axial piston pump driven by the tapered piston, it is necessary to know the driving characteristics and mechanism of the tapered piston and the cylinder block. Since each piston not only rotates on its axis and reciprocates in the cylinder bore, but also revolves around the axis of the driving shaft, it is difficult to analyze the driving mechanism theoretically. The theoretical mechanism for the bentaxis type axial piston pump is studied by using the geometrical method. The driving range of the tapered piston is determined by theoretical equations. The results show that the cylinder block is driven by one tapered piston in a limited range and the core parameters such as driving factor of the piston and the ahead delay angle influenced performance of the bentaxis type axial piston pump | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249660 | oai_dc | 전력설비 대용량 보일러 통풍기 날개각 제어 작동기 모델링 | Modelling of Power Plant Fan Pitch Blade Control Actuator | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"허준영(한국기술교육대학교); 손태하(한국전력연구원)"
] | In the power plant facility which use soft coal as a power source the fan pitch blade control hydraulicactuator is used to control the inlet and outlet gas to regulate the internal presure of the furnace and control the frequence. Sometimes malfunctions of this equipment lead to the decline of boiler thermal efficiency and 50MW large scale boiler, Analysis and modelling of the system is carried out mathematically. The responses of the system are examined by using matlab simulation for the variation of the major parameters in view of reverse enginering. Consequently the validity of the established parameters are examined. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249657 | oai_dc | 굴삭기 작업장치부의 기하학적 동역학 모델링 및 궤적 제어에 관한 연구 | Geometric Modeling and Trajectory Control Design for an Excavator Mechanism | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김성호(서울대학교); 이교일(서울대학교); 유승진(서울대학교)"
] | During the last few decades, excavation automation has ben investigated to protect the operator frommodelling and controller design methods of the hydraulic excavator are proposed in many literatures to realize the excavation automation. In this article, a geometric aproach for the multi-body system modeling is adopted to develop the excavator mechanism model that contains 4 kinematic loops and 12 links. Considering a simple soil mechanism model with a number of uncertain soil parameters, an adaptive trajectory tracking control strategy based on the developed excavator model is proposed. The improved performance of the designed controller over the simple PID controller is validated via the simulation study. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249659 | oai_dc | 속도제어－유압펌프에 의하여 구동되는 사출성형 실린더의 궤적추적제어 | Trajectory Tracking Control of Injection Molding Cylinder Driven by Speed Controlled Hydraulic Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조승호(홍익대학교)"
] | This paper deals with the issue of trajectory tracking control of a clamping cylinder for injection moulding machine, which is directly driven by speed controlled hydraulic pump in combination with AC servomotor. As a fundamental step prior to tracking controller design, feedback control system is developed by implementing a position control loop parallel with a system pressure control loop. A sliding mode controller combining velocity feedforward scheme is developed for enhancing the tracking performance. Consequently a significant reduction in tracking error is achieved for both position and pressure control applications. | 기계공학 | null | kci_detailed_000119.xml | |||
ART001249658 | oai_dc | 휠로더 자동변속기 시뮬레이터 개발 | Development of an Automatic Transmission Simulator for a Wheel Loader | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정규홍(대진대학교); 신상호(엠에스정밀); 이승일(엠에스정밀)"
] | TCU is a shift controller for automatic transmission of which major functions are to determine the shift point and manage the shifting process based on the various input signals. As the recent digital control technologies advance, it plays a key-role to improve a transmission performance and its algorithm becomes more complicated. This paper describes the development of transmission simulator for wheel loader that enables a TCU for normal stand-alone operation by the real-time emulation of TCU interface signals. It can be utilized for the analysis of shift control algorithm implemented in a commercial TCU as well as for the development of brand new TCU. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001258669 | oai_dc | 유압 완충기 내에서의 오일 유동에 대한 CFD 해석 | A CFD Analysis of the Oil Flow in a Hydraulic Shock Absorber | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"박경택(한국기계연구원); 박태조(경상대학교)"
] | Various types of hydraulic shock absorbers are widely used in many fields because of its numerous advantages. However, in order to design adequate damping characteristics, accurate flow data near the orifices are required essentially. In this paper, a commercial computational fluid dynamics(CFD) code, FLUENT is adopted to investigate the flow characteristics near orifices of a shock absorber. Static pressure and velocity vector distributions, fluid path lines are presented for compression/tension strokes and various piston speeds. In order to validate the result of analysis, the numerically obtained damping forces are compared with those of analytical estimations obtained by modified Bernoulli equation. The results reported herein will provide better understanding of the detailed flow fields within shock absorber, and the CFD analysis method proposed in this paper can be used in the design of other types of hydraulic shock absorber. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001258668 | oai_dc | 카운터밸런스밸브와 차동실린더회로를 포함한 호이스트 유압장치의 최적설계 | Optimal Design of the Hoist Hydraulic System Including the Counter Balance Valve and Differential Cylinder Circuit | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이성래(건양대학교)"
] | The typical hydraulic system of hoist is composed of a hydraulic supply unit, a directional control valve, counter balance valve, and flow control valves. The flow capacity coefficients of flow control valves should be adjusted so that the hoist is operated at moderate speed and the hydraulic energy loss is minimized. However, it is difficult to adjust the flow coefficients of flow control valves by trial and error for optimal operation. Here, the steady state model of the hoist hydraulic system including the differential cylinder circuit is derived and the optimal flow capacity coefficients of flow control valves are obtained using the complex method that is one kind of constrained direct search method. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001258666 | oai_dc | LMI를 이용한 공기압 실린더의 상태제어기 설계 | LMI-Based Controller Design of Pneumatic Cylinder | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장지성(부경대학교); 지상원(부경대학교); 김영복(부경대학교)"
] | Pneumatic driving systems have hard non-linear characteristic and large friction force compared withdriving power. Hence, it cannot be robust against parameter uncertainties, modelling error, disturbance and noise. In this study, we apply a mixed H2 /H∞ control to the generalized plant for a pneumatic driving apparatus system including parameter uncertainty and disturbance. In order to design the H2 /H∞ controller, we use the LMI technique. To evaluate control performance and robust stability of the designed controller, we compare it with a conventional controller such as PVA(Position-Velocity-Aceleration state controller) using the simulation results. As a result, it can be known that designed controller shows better robust stability than the conventional controller. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001258667 | oai_dc | The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber | The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"장지성(부경대학교); Sangwon Ji(부경대학교); Toshiharu Kagawa(동경공업대학)"
] | ISO pneumatic cylinder reliability test requires air leakage measurement. Air cylinder has many parts and the leakage shall be measured before, during and after endurance test, and, the leakage should smaller than the specified value. The existing measurement method needs complex operation and the calibration of leak detector, and, has to separate the testing cylinder from endurance test device, which causes the change of contact condition of seal in the cylinder. Therefore, it is hard to evaluate the air leakage during endurance test, and guarantee the reliability of the conventional measurement method. In this paper, a new method for air leakage measurement using isothermal chamber, which does not requires calibration or temperature compensation, and, can measure air leakage accurately with quite simple operations, is proposed. As a result, reliability of air leakage measurement can be improved because the proposed method does not have to separate the testing cylinder from the endurance test device for air leakage measurement. The effectiveness of the proposed method is proved by error analysis of leak measurement from experimental result. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001263396 | oai_dc | 콤플렉스법에 의한 호이스트 유압회로 유량제어밸브의 최적유량계수 설계 | Design of Optimal Capacity Coefficients of Flow Control Valves in the Hoist Hydraulic System Using the Complex Method | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"이성래(건양대학교)"
] | The typical hydraulic system of hoist is composed of a hydraulic supply unit, a directional control valve, two pilot operated check valves, two flow control valves. The capacity coefficients of flow control valves should be adjusted for the hoist to operate at moderate speed and minimize the hydraulic energy loss. However, it is difficult to adjust the four capacity coefficients of flow control valves by trial and error for optimal operation. The steady state model of the hoist hydraulic system is derived and the optimal capacity coefficients of flow control valves are obtained using the complex method that is one kind of constrained direct search method. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001263398 | oai_dc | 브레이크 게인 적응 휠 슬립 제어에 관한 연구 | A Study on Brake Gain Adaptive Wheel Slip Control | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조준상(서울대학교); 유승진(서울대학교); 이교일(서울대학교)"
] | The brake gain adaptive wheel slip controller for a vehicle is designed in this paper. The brake gain from braking pressure to braking torque defined by friction coefficient, friction area and effective friction radius is estimated by the adaptive law based on the wheel slip dynamics. And the wheel slip controller is designed based on the estimated brake gain. The robustness of the designed controller is analyzed using Lyapunov function and the convergence of brake gain is verified. Proposed wheel slip controller is verified via CarSim simulation with two kinds of desired wheel slip ratio. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001263397 | oai_dc | 정압력원을 이용한 에너지 절감 유압 시스템에 관한 연구 | A Study on the Energy Saving Hydraulic System Using Constant Pressure System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"조용래(울산대학교); 안경관(울산대학교); 윤종일(울산대학교); 윤주현(울산대학교); 이민수(울산대학교); 조우근(울산대학교); 윤홍수(울산대학교)"
] | It is strongly requested to reduce fuel consumption because of high oil price and exhaust gases of road vehicles for environmental preservation. To solve these problems, several types of hybrid vehicles have been developed. Among them, flywheel hybrid vehicle using variable displacement pump/motor was already proposed as one of the feasible hybrid systems in place of hybrid vehicle by the conventional storage battery. The proposed flywheel hybrid vehicle is to keep constant pressure of high pressure line by the control of swash plate angle of flywheel pump/motor as pressure compensator. The efficiency of the overall system depends severely on the efficiency of hydraulic pump/motor in the energy saving hydraulic control system by simulation. According to the control methods of swash plate angle of piston pump/motor, there remain several problems to be solved. In this paper, experimental setup for energy saving is fabricated and the efficiency of energy saving is investigated by experiments with respect to various experimental conditions. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001263399 | oai_dc | 임베디드 시스템을 이용한 CVT 유압시스템 제어 | A Control of CVT Hydraulic System using Embedded System | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"한기원(성균관대학교); 류완식(현대파워텍); 장인규(성균관대학교); 전재욱(성균관대학교); 김현수(성균관대학교); 황성호(성균관대학교)"
] | The continuously variable transmission (CVT) of which speed ratio can change continuously in a fixed range has the benefits of low fuel consumption and exhaust gas because it enables the engine of a vehicle to operate in a high efficiency range regardless of vehicle speed. The speed ratio of belt type CVT is controlled by adjusting line pressure. The one of the line pressure control methods, mechanical-hydraulic control is usually adopting VDT’s control method, in which the secondary solenoid valve has two functions both a regulator and a line pressure controller. However, this control method could not show the high performance of CVT with optimal driving capability because of the limitation of simple control algorithm, and it could not gain market share sufficiently in spite of the advantage of CVT with low fuel consumption. On the other hand, the electro-hydraulic control method gives the enhancement of power performance and low fuel consumption by implementing various driving mode using the proportional control or PWM control. The key of CVT technique is to develop a control algorithm of the electro-hydraulic solenoid valve in order to implement the speed ratio efficiently. In this paper, the line pressure control algorithm is proposed and the hydraulic system is controlled using metal belt type CVT test rig and the embedded ECU platform. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001259778 | oai_dc | ISO 10767-1에 기초한 유압 펌프의 유량 맥동 측정 및 정밀도 평가 | Measurement of Hydraulic Pump Flow Ripple Characteristics Based on the ISO 10767-1 and the Evaluation of the Measuring Accuracy | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"김지웅(부경대학교); 강만곤(대동공업); 이일영(부경대학교)"
] | The source flow ripple and the source impedance in hydraulic pump are characteristic values showingbut can measure them by some indirect methods. One representative indirect measuring method is ISO 10767-1. The authors constructed a hardware and a software for the measuring method based on ISO 10767-1. Through the error evaluation of the measured results, accuracy of the measuring method using ISO 10767-1 was examined in detail. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001259775 | oai_dc | 유압 피스톤 펌프의 슬리퍼 정압베어링에 관한 윤활특성 연구 | A Study on Lubrication Characteristic of Slipper Hydrostatic Bearing in Hydraulic Piston Pump | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"정재연(전북대학교); 백일현(전북대학교); 조인성(전북대학교); 송규근(전북대학교); 오석형(군산대학교); 정석훈(벽성대학교)"
] | The leakage generated from the clearance between the cylinder bore and the piston is one of the most serious problems in the hydraulic piston pump, and it even results in terrible decrease of the volume efficiency at a great velocity and high pressure. In this paper, the lubrication characteristic of the hydrostatic slipper bearing equipped in the hydraulic piston pump has been worked out by experimentation with three model bearings of different shape. Preparatory to this, not only the three models of piston-slipper were designed, but the corresponding experimental apparatus were also manufactured. As a result, it was verified that, according to the supply pressure, the hydrostatic bearing part of the slipper is severely affected by the pocket pressure, land pressure, oil film thickness, and leakage flow. | 기계공학 | null | kci_detailed_000120.xml | |||
ART001259776 | oai_dc | 정수압방식 동력회수장치의 구동동력 절감량 해석 | An analysis on power regeneration of hydrostatic pressure exchanger | {
"journal_name": "사단법인 유공압건설기계학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
} | [
"함영복(한국기계연구원); 최준혁(한국기계연구원); 정헌술(군산대학교); 박상진(한국기계연구원); 박중호(한국기계연구원); 윤소남(한국기계연구원)"
] | This paper presents an energy saving hydrostatic pressure exchanger for sea water desalination equipment. In a reverse osmosis(RO) system for desalinating sea water, more than 70 percent of the supplied sea water, brines which were impassable through RO membrane are bypassed, resulting in high energy losses. In this paper, a hydrostatic pressure exchanger consisting of an embedded water hydraulic piston motor and a water hydraulic piston pump was proposed and investigated in order to recover the energy of the bypassed brines. The pressurized brines are supplied to the embedded water hydraulic piston motor as power sources and the water hydraulic piston pump is driven by the output torque of the embedded water hydraulic piston motor as well as electric motor. Consequently, the energy of the bypassed brines can be recovered. To examine the electric energy saving characteristics of the hydrostatic pressure exchanger, a simulation model was constructed using commercial software and experiments were conducted. Through the results of simulation and experiment, the feasibility of the electric energy saving effect of the proposed hydrostatic pressure exchanger was investigated. | 기계공학 | null | kci_detailed_000120.xml |
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