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Research on Airborne Noise of Battery Electric Vehicles Based on Transfer Path Analysis | With the popularity of battery electric vehicles, the engine of the vehicle disappears, so the problem of road noise in cars is becoming more and more prominent. Road noise into the car can be divided into structure-borne noise and airborne noise, this paper only focuses on the airborne noise above 500Hz, completely ig... |
A Practical Approach towards Reducing the HVAC Flow Noise | Automotive heating ventilating and air conditioning (HVAC) noise is becoming a big concern area as the demand for acoustic comfort increases day by day. Vehicles are manufactured in recent years with quieter powertrain, reduced body leakage, better suspension. The other quieter technologies like electrification, hybrid... |
Rattle and Squeak Investigation on the Interior Components of Automobile | Automotive rattle and squeak performance is an important factor affecting passenger comfort and perceived quality. In the current work, finite element simulation is developed to analyze the noise potential of adjacent interior components. The statistical “3σ” limit is adopted to assess the rattle risk at adjacent surfa... |
Further Study of the Vehicle Rattle Noise with Consideration of the Impact Rates and Loudness | With the prevalent trend of the pure electric vehicle, vehicle interior noise has been reduced significantly. However, other noises become prominent in the cabin. Especially, the BSR noise generated by friction between parts and the clearance between components become the elements of complaints directly affect the qual... |
Development of Tearing Pattern Prediction Model of Laser Scored Region on Invisible Passenger Side Airbag Door | The tear seam of invisible passenger side airbag door is made on the back of an instrument panel by laser scoring method and it is not shown outside. One of the requirements for the invisible passenger side airbag door is that the airbag module should deploy with no fragmentation at hot, room and cold temperature condi... |
Airflow Simulation Relative to Door-Closing Operability | Easiness in closing a vehicle door has been often evaluated on a physical vehicle body, and in most cases, has not been fully studied by computer-aided engineering (CAE) in an earlier developing stage. The authors have developed a numerical method for reproducing the behavior of a closing door with a high fidelity. Cha... |
The Use of in Vehicle STL Testing to Correlate Subsystem Level SEA Models | For the assessment of vehicle acoustics in the early design stages of a vehicle program, the use of full vehicle SEA models is becoming the standard analysis method in the US automotive industry. One benefit is that OEM's and Tier 1 suppliers are able to cascade lower level acoustic performance targets for NVH systems ... |
Modular door system for side impact safety of motor vehicles | Side impact collision is one of the toughest safety challenges facing the Auto Industry today. Over thirteen thousand deaths, due to side impact, occurred during 1998 in the United States alone. The main difficulty in designing for side impact collisions is the limited crumple zone between the impacting vehicle and the... |
Simulation of Warm Forming Assisted Hemming to Study the Effect of Process Parameters on Product Quality | Current trends in the auto industry requiring tighter dimensional specifications combined with the use of lightweight materials, such as aluminum, are a challenge for the traditional manufacturing processes. The hemming process, a sheet metal bending operation used in the manufacturing of car doors and hoods, poses pro... |
Comparative Dimensional Quality of Doors: A Benchmarking Study | A comparative benchmarking study of the dimensional door quality 14 vehicles from Ford, General Motors, Daimler-Chrysler, Toyota, Nissan, BMW, Volvo, and Renault was conducted. Various aspects of the door design, manufacturing, assembly and hanging system were studied. This paper focuses on the dimensional quality of t... |
Comparative Datuming and Hanging Strategies of Doors: A Benchmark Study | This paper discusses the results of a door benchmark study performed on 14 vehicles. The major focus is on the selection of datums or reference points and its impact on the product quality of the door system. The results indicate that there can be a relationship between datum utilization and quality metrics at any stag... |
Conductive Plastics Leading Fuel Door Technology | This paper will discuss, compare, and contrast current materials, designs, and manufacturing options for fuel filler doors. Also, it will explore the advantages of using conductive thermoplastic substrates over other materials that are commonly used in the fuel filler door market today. At the outset, the paper will di... |
The Effect of Turbulence on Peak and Average Pressures on a Car Door | The influence of turbulence on automotive aerodynamics requires further investigation. This paper provides evidence that turbulence directly affects average and peak forces on the front door of a sedan automobile. Wind tunnel and several on-road test conditions were investigated. The results include instantaneous peak ... |
A Robust Solution for a Power-Train Mounting System for Automotive NVH Refinements | Production variations of a heavy duty truck for its vibrations were measured and then analyzed through an Ishikawa diagram. Noise and Control factors of the truck idle shake were indentified. The major cause was found to be piece to piece variations of its power-train (PT) rubber mounts. To overcome the same, a new nom... |
Structural Diffuse Field Excitation Synthesis by Synthetic Array (SFS-SA), Application to Cars Panels Contributions | Diffuse field or turbulent boundary layer excitations of vehicles are of huge interest in automotive industry. For such excitations reverberation chambers or wind tunnels are necessary, this means high cost experiments. The idea of sound field synthesis to create the acoustic effect corresponding to diffuse field or tu... |
Engine Sound Reduction and Enhancement Using Engine Vibration | Over the past decade, there have been many efforts to generate engine sound inside the cabin either in reducing way or in enhancing way. To reduce the engine noise, the passive way, such as sound absorption or sound insulation, was widely used but it has a limitation on its reduction performance. In recent days, with t... |
The Design of Wind Noise Transducers to Separate Acoustic and Turbulent Pressures | A four element wind noise transducer has been designed with surface mounted electret microphones in an array pattern which allows for the separate determination of the acoustic and turbulent pressures in wind noise. Three closely spaced transducers, defining an x-y coordinate system, are positioned to determine the vel... |
Prediction of Automotive Air-Handling System Flow Noise Sound Quality Using Sub-System Measurements | This paper presents the methodology of predicting vehicle level automotive air-handling system air-rush noise sound quality (SQ) using the sub-system level measurement. Measurement setup in both vehicle level and sub-system levels are described. To assess the air-rush noise SQ, both 1/3 octave band sound pressure level... |
A Unique Noise & Vibration Software Tool for Automotive Troubleshooting | A unique Matlab-based coded engineering software tool (Time-Frequency Analyzer Core®) was developed that allows users to process acquired time data to help in identifying sources and paths of noise and vibration (in the experience of the authors). The Time-Frequency Analyzer Core (TFAC) software does not replace commer... |
Operational Determination of Car Window Damping | Wind noise can be a significant event for automotive design engineers. The greenhouse glass plays an important role in the wind noise process. Robust estimates of the greenhouse glass damping are necessary for both understanding and modeling the role of the glass in the wind noise process. One unanswered question is wh... |
An Experimental Study of Mechanism of Body Panel Vibration in Booming Noise Reduction of Passenger Vehicles | In a typical passenger vehicle, there can be different types of noises generated which are broadly categorized as Interior Noise and Exterior Noise. The interior noise sources can be further classified into noises which can be Structure Borne or Air Borne. One of the major sources of both structure borne and airborne n... |
The Effects of Unsteady Flow Conditions on Vehicle in Cabin and External Noise Generation | A vehicle driving on the road experiences unsteady flow conditions which are not generally reproduced in the development environment. This paper investigates the potential importance of this difference to aeroacoustics and hence to occupant perception and proposes a methodology to enable better ranking of designs by ta... |
Daimler Aeroacoustic Wind Tunnel: 5 Years of Operational Experience and Recent Improvements | Since 2013 the new Daimler Aeroacoustic Wind Tunnel (AAWT) is in operation at the Mercedes-Benz Technology Center in Sindelfingen, Germany. This construction was the second stage of a wind tunnel center project, which was launched in 2007 and started with the climatic wind tunnels including workshop and office areas. T... |
Surface treatment to reduce squeak noise in vinyl parts | It is a common practice of automotive industry to avoid dynamic contact between two surfaces with similar roughness for plastics and interior trim parts. That means reduce the friction and, consequently the squeak noise to the minimum level to meet zero noise level. Unfortunately, for design or economics reasons, that ... |
Designing In-Cab Sound of Vehicles as per the Customer Driving Pattern on Roads | Vehicle refinement from point of view reduction in its Noise, Vibrations and Harshness (NVH) affects customer’s buying decision and it also directly influences his/her driving experience on road at different speeds. Customer voice, however, indicates that a traditional process of developing design solutions is not alig... |
Low Frequency In-Cab Booming Noise Reduction in the Passenger Car | In-cab booming noise is low frequency (20 Hz∼300 Hz) phenomenon excites the cabin structure, which occurs mainly due to excitations from the powertrain, exhaust system, road input, etc. Annoyance due to booming noise affects the In-cab sound quality, which results in passenger discomfort. A diesel passenger car observe... |
Investigation of Cabin Noise while Accelerating on Low Mu Track through Simulation Approach Using Full Vehicle ADAMS/Car Model | Cabin noise is a significant product quality criteria which enables the customers for product differentiation. There are various sources of cabin noise such as wind, structures(panels), engine, suspension, tire and roads. During product development phase, extensive tests has been conducted to improve vehicle dynamics b... |
Design of Super Silent Enclosure for Diesel Genset Using Statistical Energy Analysis (SEA) Technique | Diesel engine generators are commonly used as a power source for various industrial and residential applications. While designing diesel generator (DG) enclosures requirements of noise control, ventilation and physical protection needs to be addressed. Indian legislation requirement demands DG enclosure insertion loss ... |
Computational Aeroacoustics Based on a Helmholtz-Hodge Decomposition | Using existing aeroacoustic wave equations, we propose a general hybrid aeroacoustic method, based on compressible flow data. By applying the Helmholtz-Hodge decomposition on arbitrary domains, we extract the incompressible projection (non-radiating base flow) of the compressible flow velocity by solving the vector val... |
Numerical Design of Loudspeaker Systems in a Car Cabin | These days loudspeaker systems in vehicles are gaining more and more of importance. Usually quite a few speakers are installed and driven in combination in order to obtain a convincing sound environment for the occupants/customers. Sometimes even a 3D sound experience shall be reached, where up to 20 loudspeakers might... |
Correlation Analysis of Interior and Exterior Wind Noise Sources of a Production Car Using Beamforming Techniques | Beamforming techniques are widely used today in aeroacoustic wind tunnels to identify wind noise sources generated by interaction between incoming flow and the test object. In this study, a planar spiral microphone array with 120 channels was set out-of-flow at 1:1 aeroacoustic wind tunnel of Shanghai Automotive Wind T... |
An Analysis on Automotive Side Window Buffeting Using Scale Adaptive Simulation | Automotive window buffeting is a source of vehicle occupant’s discomfort and annoyance. Original equipment manufacturers (OEM) are using both experimental and numerical methods to address this issue. With major advances in computational power and numerical modelling, it is now possible to model complex aero acoustic pr... |
Acoustic Enclosure Optimization for a Higher Capacity Diesel Generator Set Using Statistical Energy Analysis (SEA) Based Approach | Diesel powered electric generators are used in a variety of applications, such as emergency back-up power, temporary primary power at industrial facilities, etc. As regulatory and customer requirements demand quieter designs, special attention is given to the design of acoustic enclosures to balance the need of noise c... |
Sound Quality Evaluation of a Brake and Clutch Pedal Assembly used for Automotive Applications | Sound Quality (SQ) of brake and clutch pedal assembly plays an important role in contributing to vehicle interior noise and perception of sound. Quiet operation of brake and clutch units also reflects the vehicle built and material quality. Noise emitted from these sub-assemblies has to meet certain acceptance criteria... |
A Study on the Vehicle Body Effect on Brake Noise | Creep groan noise occurs in a just moving vehicle by the simultaneous application of torque to the wheel and the gradual release of brake pressure in-vehicle. It is the low frequency noise giving the driver a very uncomfortable feeling. Recently, the field claims regarding the creep groan noise are increasing. So far, ... |
C-17 Cargo Ramp and Door Automated Drilling & Fastening System - Project Overview | To further reduce airframe costs associated with fastener installation, an Automated Drilling & Fastening System (ADFS) has been implemented on the C-17 Program to enhance current Mold Line attachment processes. The ADFS will automate up to 90% of all Cargo Ramp and Door Mold Line fastener installations. Implementation... |
Mechanical and Structural Aspects of the C-17 Cargo Ramp and Cargo Door ADFS | The cargo ramp and cargo door are two major C-17 components that are built in St. Louis, MO and shipped by rail for final assembly in Long Beach, CA. A major portion of the total build time for the ramp and door assemblies consisted of the hand installation of approximately 16,000 moldline fasteners and 19,400 moldline... |
A Direct Method for Designing Fuel Filler Door with Torsional Spring | A direct method is developed for designing a vehicle fuel filler door with torsional spring. The design parameters include the door's geometrical parameters and spring dimensions. The design requirements are based on the finger force curve during closing and opening, and the bending stress in the spring. An example is ... |
An Ultra-Light Thin Sliding Door Design - A Multi-Product Multi-Material Solution | Sliding door designs are applied to rear side doors on vans and other large vehicles with a trend towards dual sliding doors with power operation. It is beneficial for the vehicle user to reduce the weight of and space occupied by these doors. Alcoa, in conjunction with Ford, has developed a multi-product, multi-materi... |
Integrated Test Platforms: Taking Advantage of Advances in Computer Hardware and Software | Ongoing hardware, software, and networking advances in low-cost, general-purpose computing platforms have opened the door for powerful, highly usable, integrated test platforms for demanding industrial applications. With a focus on the automotive industry, this paper reviews the pros and cons of integrated test platfor... |
Optimal Design of Panel Reinforcing Material Using Practical Measurement Technique | Expandable reinforcing material such as that used for the outer panel of a door has been used to compensate for the lack of stiffness in automotive body panels. This material can improve panel stiffness and reduce vibration that causes radiated noise. Material properties in practical use have generally been evaluated b... |
Quantitative Assessment of Cosmetic and Structural Quality in Automotive Outer Body Panels Using ARAMIS Stereo Photogrammetry System | The methodology described enables high accuracy in the measurement of static and dynamic stiffness and dent resistance. Among the parameters being evaluated are: stiffness and dent resistance of the automotive outer body assembled panels – under both static and dynamic loading and the effect of the stiffening features ... |
Visualization and Classification of Strategy for Entering Car | This paper proposes a method for visualizing and classifying the variation in the motions of a person when entering a passenger vehicle. Entering behaviors vary greatly between individuals, especially if the vehicle door is designed to have large clearance. The present study was conducted with the aim of supporting the... |
Development and Application of High-Strength Steel for Auto Outer Panel in Baosteel | The characteristics of China's automotive steel sheets and high strength steels (including bake-hardening, high strength IF and isotropic steel) developed recently by Baosteel for automotive outer panels are briefly reviewed. Among these steels, bake-hardening (BH) steel is often used to make outer panel parts, such as... |
Advanced High-Strength Steels and Hydroforming Reduce Mass and Improve Dent Resistance of Light Weight Doors In UltraLight Steel Auto Closures Project | In May 2000, the UltraLight Steel Auto Closure (ULSAC) Consortium unveiled a lightweight frameless steel door design that achieves 42 percent weight savings over the average benchmarked (1997 model year vehicles) frameless door and 22 percent savings over the lightest benchmark, a framed door. ULSAC was commissioned by... |
Economic Analysis of Two Different Door Architectures | In the past, materials selection for automotive components has been managed on a part-by-part basis. As a result, the economics of these selections have often been reduced to comparing material price/property ratios, rather than technological options. More recently, the debate around modular designs and their advantage... |
Open Bay Door Analysis Process for Hubble Space Telescope Servicing Mission 3B | During Servicing Mission 3B (SM3B) for the Hubble Space Telescope (HST) the Power Control Unit (PCU) will be replaced. The PCU was not originally designed to be replaced on orbit but was later identified as having the capability of being removed and replaced on orbit. The PCU has many connectors and bolts, some of whic... |
Passive Sensing of Driver Intoxication | A sensor that passively monitors the driver for intoxication has been demonstrated. The driver's blood alcohol concentration (BAC) is obtained by sensing alcohol and CO2 in air drawn from the vehicle cabin. With a legally drunk driver, the steady state alcohol concentration can be as low as 0.3 ppm, even with the doors... |
The Truck that Jack Built: Digital Human Models and their Role in the Design of Work Cells and Product Design | Henry Ford is credited with the invention of the assembly line and for 100 years now we have manufactured high quality cars and trucks. The process to bring cars and trucks into production has seen many changes with the introduction of new technology, however the principle is still the same; designers draw concept desi... |
Low Gloss ABS Advancements for Automotive Interior Components | Automotive Original Equipment Manufactures (OEM's) desire interior plastic components being used on consoles, doors, trim areas, and instrument panels to have very low gloss levels. In fact, some OEM's have specified a 2.0 or lower sixty degree Gardner gloss level for most first surface interior components molded in co... |
Child Safety via Anti-Trap Proximity Technology | Sir Galahad™ anti-trap windows prevent injury and death, creating a new standard of care for automotive power closures. NHTSA estimates 500 people, approximately 50% of which are children, are treated in hospital emergency rooms each year for injuries related to power windows [11]. Sir Galahad™ technology is easy to in... |
Tailor-Welded Aluminum Blanks for Liftgate Inner | Tailor welded steel blanks have long been applied in stamping of automotive parts such as door inner, b-pillar, rail, sill inner and liftgate inner, etc. However, there are few known tailor welded aluminum blanks in production. Traditional laser welding equipment simply does not have the capability to weld aluminum sin... |
Use of SEA for Vehicle Target Setting and Efficient Realization of Vehicle Acoustic Goals | Statistical Energy Analysis (SEA) is an established technique for predicting vehicle NVH. Since SEA is more sensitive to certain parameters such as material properties, damping, absorption, and treatment thickness and coverage than to fine details of geometry, using SEA is especially practical and can be particularly a... |
A New Approach for Best Fit Assembly Based on the Behaviour of Components | Best fit assembly is now a widely spread assembly technique that consists in finding an optimal position of measured components in order to get an assembly that fits its tolerance specifications. The rigid body assumption does not apply for compliant assemblies that can be slightly deformed and for which the geometrica... |
Two-Reference Beam Double-Pulsed Holographic Interferometry with Direct Phase Measurement in Transient Processes Study | Holographic interferometry has been successfully employed to characterize both static and dynamic behavior of diverse types of structure under stress. Double-exposure pulsed holographic interferometry has been extensively used in performing the vibration analysis and qualitative investigations of deformation of the non... |
Active vibration control of automotive like panels | Automotive panels can be great transmitter of undesired sound from external sources. The ability of controlling the noise and vibration performance of such panels is critical to the perceived quality of a vehicle. Passive vibration systems are currently used in vehicles, but they tend to be heavy in nature and capable ... |
Analysis of Determining Parameters of Acoustical Comfort Inside Vehicles | The description of subjectively perceived acoustical comfort inside vehicle compartments is a complex challenge. On the one hand, it depends on physically measurable events like acoustical stimuli with a defined sound pressure level and frequency distribution. On the other hand, it is also strongly dependent on further... |
Research on the Application of Aluminum Door Beam for Automobiles | Door beams are attached inside car doors as one way to protect passengers from shock when the car is side impacted. Though door beams made of high tensile strength steel predominate now, the use of aluminum is growing rapidly to reduce weight. The effects of cross-section and types alloy on the performance of aluminum ... |
A Magnetorheological Door Check | Several shortcomings of mechanical door checks are overcome using a magnetorheological damper. Because the damper is electrically actuated, it can check in any desired position. The logical decision to activate or release the door check can be made either by passive circuitry based on input signals from switches attach... |
Enhanced Security Flight Deck Doors-Commercial Airplanes | In the wake of the 9/11/2001 hijacking events, the Federal Aviation Administration (FAA) has emphasized the need for enhanced flight deck doors on commercial airplanes. The paper describes enhanced flight deck door, which meets the new FAA requirements for intrusion resistance and ballistic protection. In addition, the... |
Design of Experiments (DOE) and Other 6-Sigma Tools Used to Minimize Rear Door Opening Vibration on a Vehicle | Very often, engineering problems involve several variables that have different physical behavior making theoretical modeling complex and difficult. In the present paper, 6-Sigma tools were used to develop an experimental model that describes the system. The issue in focus was the vibration observed at the top of rear d... |
Passive Close-Off Feature for Sample Acquisition and Retention | The current coring bit and percussive drilling style works very well for strong rocks; however, when coring into weak, crumbling rock, the core tends to break apart and simply fall out of the bit. These rocks, powder, and other debris can have useful information that is lost when they fall out of the bit after the core... |
SPSCGR | SPSCGR generates a contact graph suitable for use by the ION (Interplanetary Overlay Network) DTN (Delay/Disruption Tolerant Network) implementation from data provided by the JPL SPS (Service Preparation System) Portal. Prior to SPSCGR, there was no way for a mission or other entity to route DTN traffic across the DSN ... |
Reactionless Drive Tube Sampling Device and Deployment Method | A sampling device and a deployment method were developed that allow collection of a predefined sample volume from up to a predefined depth, precise sampling site selection, and low impact on the deploying spacecraft. This device is accelerated toward the sampled body, penetrates the surface, closes a door mechanism to ... |
Wallops Flight Facility 6U Advanced CubeSat Ejector (ACE) | Six-unit (6U) CubeSats are recognized as the next nanosatellite to be considered for standardization. The CubeSat standard established by California Polytechnic University (Cal Poly), which applies to 1U–3U sizes, has proven to be a valuable asset to the community. It has both provided design guidelines to CubeSat deve... |
The Future of Aircraft Electrification | A resounding applause fills an auditorium in Fort Worth, Texas, as engineers, researchers, and business leaders stand in unison to celebrate the closing keynote of another aerospace conference. Participants grab their belongings and file out into the street where they clamor for rides to the airport. I hail a cab and g... |
SAE Electronics + Connectivity 2012-11-28 | Integration opens the door Semiconductor suppliers are integrating many functions into power devices while also cutting power consumption in an environment, automotive doors, where 8-bit microcontrollers still hold sway. |
Safety with Convenience: Applying Low Cost Obstacle Detection Technology to Powered Closure Systems with Express Motion | There is a growing market for Powered Closure Systems and a strong trend to incorporate express motion for convenience. This drives the need to incorporate obstacle detection using anti-pinch technology for safety reasons according to vehicle safety standards applicable in the governing region. Powered Closure systems ... |
Innovative Thermoplastic Cavity Filler Design Solutions | The use of acoustic cavity fillers or “baffles” to prevent the propagation of air borne and structure borne noise, water and dust into the interior spaces of vehicle structures has been in practice for many years. Continuous development of new OEM requirements has pushed the state of the art concerning the design and f... |
Optimization through NVH Analysis to Improve the Vehicle Acoustics and Quality of Transmission Shifter | Gear shift quality and feel determines the performance of the transmission. It is dependent on the synchronizer, shift system, gear shifter etc in a transmission. In this study the impact of the transmission shifter on the gear shift feel is detailed. More focus is paid towards the feel in terms of NVH characteristics.... |
Vibro-Impact Analysis of Manual Transmission Gear Rattle and Its Sound Quality Evaluation | Experimental schemes, frequency characteristics, subjective and objective sound quality evaluation and sound quality prediction model establishment of a certain mass-production SUV (Sport Utility Vehicle, SUV) manual transmission gear rattle phenomenon were analyzed in this paper. Firstly, vehicle experiments, includin... |
Systems Engineering Approach for Voice Recognition in the Car | In this paper, a systems engineering approach is explored to evaluate the effect of design parameters that contribute to the performance of the embedded Automatic Speech Recognition (ASR) engine in a vehicle. This includes vehicle designs that influence the presence of environmental and HVAC noise, microphone placement... |
A Tailgate(Trunk) Control System Based on Acoustic Patterns | When customers use a tailgate (or trunk), some systems such as power tailgate and smart tailgate have been introduced and implemented for improving convenience. However, they still have some problems in some use cases. Some people have to search for the outside button to open the tailgate, or they should take out the k... |
A CFD Analysis Method for Prediction of Vehicle Exterior Wind Noise | High frequency wind noise caused by turbulent flow around the front pillars of a vehicle is an important factor for customer perception of ride comfort. In order to reduce undesirable interior wind noise during vehicle development process, a calculation and visualization method for exterior wind noise with an acceptabl... |
Reanalysis of Linear Dynamic Systems using Modified Combined Approximations with Frequency Shifts | Weight reduction is very important in automotive design because of stringent demand on fuel economy. Structural optimization of dynamic systems using finite element (FE) analysis plays an important role in reducing weight while simultaneously delivering a product that meets all functional requirements for durability, c... |
Comparative Study of Adaptive Algorithms for Vehicle Powertrain Noise Control | Active noise control systems have been gaining popularity in the last couple of decades, due to the deficiencies in passive noise abatement techniques. In the future, a novel combination of passive and active noise control techniques may be applied more widely, to better control the interior sound quality of vehicles. ... |
Frontloading Approach for Sound Package Design for Noise Reduction and Weight Optimization Using Statistical Energy Analysis | First time right vehicle performance and time to market, remains all automotive OEMs top priority, to remain competitive. NVH performance of product communicates impression to customer, remains one of the most important and complex attribute to meet, considering performances to be met for 20 Hz -6000 Hz. Frontloading t... |
Uncertainty Analysis of High-Frequency Noise in Battery Electric Vehicle Based on Interval Model | The high-frequency noise issue is one of the most significant noise, vibration, and harshness problems, particularly in battery electric vehicles (BEVs). The sound package treatment is one of the most important approaches toward solving this problem. Owing to the limitations imposed by manufacturing error, assembly err... |
Road Noise Evaluation by Sound Quality Simulation Module | An objective evaluation of sound quality is a technical bridge connecting sound pressure level (SPL) and human auditory sensation. In this paper, an algorithm is proposed for calculating objective evaluation parameters of sound quality (including loudness, sharpness and articulation index), considering acoustic charact... |
Windshield Glare from Bus Interiors: Potential Impact on City Transit Drivers at Night | Windshield glare at night is a safety concern for all drivers. Public transit bus drivers also face another concern about glare caused by interior lighting sources originally designed for passenger safety. The extent to which interior light reflections contribute to glare is unknown. Unique methods for measuring discom... |
Lockheed Martin Low-Speed Wind Tunnel Acoustic Upgrade | The Lockheed Martin Low-Speed Wind Tunnel (LSWT) is a closed-return wind tunnel with two solid-wall test sections. This facility originally entered into service in 1967 for aerodynamic research of aircraft in low-speed and vertical/short take-off and landing (V/STOL) flight. Since this time, the client base has evolved... |
Advancement in Vehicle Development Using the Auto Transfer Path Analysis | This paper presents the most recent advancement in the vehicle development process using the one-step or auto Transfer Path Analysis (TPA) in conjunction with the superelement, component mode synthesis, and automated multi-level substructuring techniques. The goal is to identify the possible ways of energy transfer fro... |
Development of Feedback-Based Active Road Noise Control Technology for Noise in Multiple Narrow-Frequency Bands and Integration with Booming Noise Active Noise Control System | When a vehicle is in motion, noise is generated in the cabin that is composed of noise in multiple narrow-frequency bands and caused by input from the road surface. This type of noise is termed low-frequency-band road noise, and its reduction is sought in order to increase occupant comfort. The research discussed in th... |
Source-Path-Contribution Methodologies across a Wide Range of Product Types | Source-path-contribution (SPC) analysis, or transfer-path-analysis, is a test based method to characterize noise and vibration contributions of a complex system. The methodology allows for the user to gain insight into the structural forces and acoustic source strengths that are exciting a system, along with the effect... |
Current Status and Future Developments of ANC Systems | Active Noise Control (ANC) has long been seen as emerging technology. During recent years, however, it became popular in new vehicle and infotainment platforms within a broad range of OEMs. This paper summarizes the current status and lessons learned of production systems (as well as those entering production soon) and... |
Coupling CFD with Vibroacoustic FE Models for Vehicle Interior Low-Frequency Wind Noise Prediction | With the reduction of engine and road noise, wind has become an important source of interior noise when cruising at highway speed. The challenges of weight reduction, performance improvement and reduced development time call for stronger support of the development process by numerical methods. Computational Fluid Dynam... |
Sideglass Turbulence and Wind Noise Sources Measured with a High Resolution Surface Pressure Array | The authors report on the design and application of a high resolution micro-electro-mechanical (MEMS) microphone array for automotive wind noise engineering. The array integrates both sensors and random access memory (RAM) chips on a flexible circuit board that eliminates high channel count wiring and allows the array ... |
Prediction of Interior Noise in a Sedan Due to Exterior Flow | Aero-vibro-acoustic prediction of interior noise associated with exterior flow requires accurate predictions of both fluctuating surface pressures across the exterior of a vehicle and efficient models of the vibro-acoustic transmission of these surface pressures to the interior of a vehicle. The simulation strategy use... |
Optimization of a Porous Ducted Air Induction System Using Taguchi's Parameter Design Method | Taguchi method is a technology to prevent quality problems at early stages of product development and product design. Parameter design method is an important part in Taguchi method which selects the best control factor level combination for the optimization of the robustness of product function against noise factors. T... |
The Predictive Simulation of Exhaust Pipe Narrow-band Noise | A method of predictive simulation of flow-induced noise using computational fluid dynamics has been developed. The goal for the developed method was application in the vehicle development process, and the target of the research was therefore set as balancing the realization of a practical level of predictive accuracy a... |
Automobile Wind Noise Speed Scaling Characteristics | Wind noise, an aeroacoustic phenomenon, is an important attribute that influences customer sensation of interior quietness in a moving vehicle. As a vehicle travels faster, occupants' sensation of wind noise becomes increasingly objectionable. The purpose of this work is to investigate the increase of wind noise level ... |
Assessing the Aeroacoustic Response of a Vehicle to Transient Flow Conditions from the Perspective of a Vehicle Occupant | On-road, a vehicle experiences unsteady flow conditions due to turbulence in the natural wind, moving through the unsteady wakes of other road vehicles and travelling through the stationary wakes generated by roadside obstacles. Separated flow structures in the sideglass region of a vehicle are particularly sensitive t... |
Planetary Airlock and Suitlock Requirements and Alternate Approaches | This study describes the operational requirements for planetary surface access and compares the performance of a hatch, airlock, suitlock, and suitport. The requirements for mitigating dust, performing EVA (ExtraVehicular Activity) by only part of the crew, and use on Mars as well as the Moon are strong reasons to pref... |
The Study of Roller Hemming Process for Aluminum Alloy via Finite Element Analysis and Experimental Investigations | Recently the automotive industry faces many competitive challenges including weight and cost reduction to meet the needs for high fuel efficiency. Therefore, the use of light metals such as aluminum alloys has been increased to produce the body structure of light-weight vehicles. However, since the formability of alumi... |
A Modern Development Process to Bring Silence Into Interior Components | Comfort and well-being have always been connected with a flawless interior acoustic, free of any background noise or BSR, (buzz, squeak and rattle). BSR noises dominate the interior acoustic and represent one of the main sources for discomfort often causing considerable warranty costs. Traditionally BSR issues have bee... |
Obstacle Detection for Power Folding Seats | In the past years the automotive industry has equipped it's vehicles with more and more automated power driven functions. Starting with the “express up/down ” functions for power windows and “easy entry/exit” functions of memory seats, automated power movements have also been introduced into power sliding doors as well... |
Using Spherical Beamforming to Evaluate Wind Noise Paths | Microphone array based techniques have a growing range of applications in the vehicle development process. This paper evaluates the use of Spherical Beamforming (SB) to investigate the transmission of wind-generated noise into the passenger cabin, as one of the alternative ways to perform in-vehicle troubleshooting and... |
Study of Coupling Behavior of Acoustic Cavity Modes to Improve Booming Noise in Passenger Vehicles | Interior sound quality is one of the significant factors contributing to the comfort level of the occupants of a passenger car. One of the major reasons for the deterioration of interior sound quality is the booming noise. Booming noise is a low frequency (20Hz∼300Hz) structure borne noise which occurs mainly due to th... |
Multidisciplinary Design Optimization of BEV Body Structure | Blade Electric Vehicle (BEV) with a light body plays an important role in saving the energy and reducing the exhaust emission. However, reducing the body weight need to meet the heterogeneous attributes such as structural, safety and NVH (Noise, Vibration and Harshness) performance. With the rapid development of finite... |
Approach to Control the in Cab Noise without Affecting Passenger Comfort in AC Midi Buses | This paper discusses various fruitful iterations / experiments performed to reduce air flow induced noise without compromising on total air flow requirement for thermal comfort and ways to avoid heat ingress inside the bus. Also the paper discusses the devised process for noise reduction through front loading of comput... |
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