publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2021-01-01 | The multi-criteria problem of transverse vibrations attenuation of a cantilever beam is considered by the active and passive damping methods. The mathematical model of beam is provided by Bernoulli–Euler’s hypotheses with the linear viscosity. Perturbation acting on the beam belongs to a class L_2 of functions. The bea... | Optimal Attenuation of Transverse Vibrations for a Cantilever Beam | 10.1007/978-3-030-54928-2_3 |
2021-01-01 | Let’s extend our free vibration analysis from Chap. 2 to include two degrees of freedom in the model. This would make sense, for example, if we completed a measurement to determine the frequency response function (FRF) for a system and saw that there were obviously two modes of vibration within the frequency range of i... | Two Degree of Freedom Free Vibration | 10.1007/978-3-030-52344-2_4 |
2021-01-01 | The present work aims to study the free vibration and damping properties of pure bamboo bioepoxy composites (B), pure basalt bioepoxy composites (b), and bamboo/basalt fiber reinforced hybrid bioepoxy composites. The pure and hybrid composites were fabricated by hand layup technique with different layering sequences su... | Free Vibration Analysis of Bamboo Fiber-Based Polymer Composite | 10.1007/978-981-15-8489-3_6 |
2021-01-01 | The woven fabric carbon/epoxy composite is one of the commercially well-recognized composite materials for structural applications like aerospace systems, automobiles and also in ship building industries. In the present investigation, dynamic mechanical behavior of woven fabric carbon epoxy composite laminate fabricate... | Study on the Influence of Nanosized Silica Reinforcement in Microrubber Blended Epoxy Carbon Composite Laminate Subjected Under Dynamic Mechanical Analysis | 10.1007/978-981-15-6267-9_42 |
2021-01-01 | In this paper, a seismic analysis of the Menta dam is briefly described. The Menta dam is a bituminous-faced rockfill dam located in Southern Italy, lying in the heart of Aspromonte Massif at an elevation of about 1400 m a.s.l. The embankment is about 90 m high at its deepest point, and the reservoir impounds 1.8 × 107... | Seismic Analyses of Menta Embankment Dam: An Elasto-Plastic Model with a Stress-Strain Dependent Stiffness and a Composite Yielding Surface | 10.1007/978-3-030-51085-5_34 |
2021-01-01 | Determination of dynamic properties of soil is a difficult, complex, and time-consuming task but an essential and important aspect in geotechnical earthquake engineering problems. Dynamic soil properties are important to predict the ground motion, site response, and probability of seismic hazards in seismic zones. Seis... | Small Strain Stiffness of Cemented Sand | 10.1007/978-981-33-6564-3_55 |
2021-01-01 | Advancement in vehicle technology has explored many possibilities for improvement, keeping customer satisfaction in mind. One major criterion which a passenger always wishes to possess is ride comfort. But the suspension parameters suitable for a good ride comfort may not support another salient feature called road hol... | Optimal Parameters Identification of Quarter Car Simulink Model for Better Ride Comfort and Road Holding | 10.1007/978-981-15-8315-5_53 |
2021-01-01 | In structural engineering aspect, the inherent structural property of the building is not sufficient to control the structural response when it comes to strong earthquakes. The common control strategy used by researchers makes use of energy dissipating devices that absorb the energy imparted to the structure due to ear... | Seismic Control and Performance of Passive Hybrid Damper Under Near-Field Earthquakes | 10.1007/978-981-15-5235-9_1 |
2021-01-01 | The tall building is always prone to environmental loads like wind pressure and earthquake. As height of the structure increases, the effect of wind pressure also increases based on the region where the building is placed. There are many structural forms developed to overcome the lateral loads, one of the system is cal... | Response Control of Wind-Excited Outrigger Structural System | 10.1007/978-981-16-0336-5_34 |
2021-01-01 | This work is based on the optimum design of performance parameters of MR damper piston which is used in semi-active suspension system using Taguchi method based on grey relational analysis (GRA) and ANOVA (analysis of variation). For better ride comfort and great control over vehicle, suspension system plays a main rol... | Performance Parameter Optimization of MR Damper Piston Using Taguchi Method and Grey Relational Analysis | 10.1007/978-981-16-0942-8_18 |
2021-01-01 | Tuned sloshing damper is a well-established and popular passive control device for vibration mitigation of structures subjected to excitations such as wind, earthquake, wave, etc. However, being a long period system, the applicability of this type of control device is restricted to flexible structures. To overcome this... | A Novel Sloshing Damper for Vibration Control of Short Period Structures | 10.1007/978-981-15-8138-0_26 |
2021-01-01 | Purpose The magnetorheological (MR) damping devices have attracted an increasing amount of attention in the field of vibration control for their excellent performance of the vibration absorption. Systematically, the constitutive mechanical models of the MR fluids affect the control accuracy for the control strategies a... | The Dynamic Models, Control Strategies and Applications for Magnetorheological Damping Systems: A Systematic Review | 10.1007/s42417-020-00215-4 |
2021-01-01 | Poorly damped systems exhibit a high oscillatory behavior making them harder to control. The paper explores the possibilities of controlling a poorly damped system using different fractional order control approaches such as the Fractional Order Internal Model Control (FOIMC) and the Fractional Order Proportional Integr... | Comparison of Various Fractional Order Controllers on a Poorly Damped System | 10.1007/978-3-030-77314-4_18 |
2021-01-01 | In this research, we describe the design of a seismic isolation system with power generation performance. There are three main types of anti-vibration measures: earthquake resistance, vibration control, and seismic isolation. Recently, seismic isolation structures that do not transmit vibrations by insulating them from... | Experimental Vibration Analysis of Seismic Isolation System Using Inertial Mass Damper | 10.1007/978-3-030-48153-7_33 |
2021-01-01 | In recent mechanical systems, vibration problems have become obvious as the size and working speed of the equipment become smaller and faster. Much attention has been paid to develop vibration control devices, e.g., the vibration isolators and absorbers. The size of the absorbers is expected to be smaller in view of sp... | Development of an Active Mass Damper Driven by an Amplitude-Modulated Signal | 10.1007/978-3-030-47618-2_34 |
2021-01-01 | A magnetorheological (MR) fluid is one of functional fluids whose rheological properties vary in response to a magnetic fluid. The change of the properties is so drastic and quick that it is applied to controllable dampers for semi-active vibration suppressions. However, conventional cylindrical dampers using MR fluid ... | Semi-active Vibration Suppression of a Structure by a Shear-Type Damper Using Magnetorheological Grease | 10.1007/978-3-030-47618-2_30 |
2021-01-01 | This paper shows test and analyses results of a new oil damper, “The Oil Damper with Stiffness”. It was developed to solve some issues around seismic retrofit. There are difficulties in reinforcing buildings which were designed before 1981 in accordance with The Old Buildings Standards Act and many buildings have low s... | Development of New Oil Damper with Stiffness for Architectural Vibration Control and Experimental Research on Structural Characterization | 10.1007/978-981-15-8079-6_126 |
2021-01-01 | If a response (that is, an output) can be described by a second-order differential equation, this circuit is referred to as a second-order circuit. An RLC circuit is a second-order circuit. Sometimes (but not always), the order of the circuit can be estimated by the total number of inductors and capacitors in the circu... | Second-Order Circuits | 10.1007/978-3-030-60515-5_25 |
2021-01-01 | Ferromagnetic resonance spectroscopy (FMR) is a versatile characterization technique that probes the magnetization dynamics in the frequency domain. Despite its long history, there continues to be significant improvement regarding the sensitivity and frequency range achievable in ferromagnetic resonance experiments. In... | Ferromagnetic Resonance | 10.1007/978-3-030-70443-8_16 |
2021-01-01 | With the increasing penetration rate of the renewable energy sources in the microgrid, the state-of-stability (SoS) in the system is decreasing. The deep-down issue is rooted in the loss of inertia. Eventually, in recent time, the research in the field of virtual inertia emulation schemes has gained a lot of momentum. ... | Auxiliary Dynamic Damping Loop in the Microgrid for Enhancing Frequency Recovery Rate | 10.1007/978-981-15-8218-9_6 |
2021-01-01 | This article discusses the end-to-end design of electric machines (EM) for their use in the composition of shock absorbers with a regenerative effect (SARE) and its stages. It describes the implementation and end-to-end design of synchronous EM with permanent magnets (PM) with the help of the developed methods of desig... | Design Methodology for Shock Absorbers with Regenerative Effect for Springing Systems of Wheeled Vehicles | 10.1007/978-3-030-54814-8_3 |
2021-01-01 | Foundation in case of industries and high-rise buildings where turbines, generators, and compressors are installed undergoes vibration. This paper presents the experimental and numerical study on an isolated square shallow foundation under vertical periodic machine vibrations. To excite the foundation with vertical dyn... | Experimental and Numerical Study of Shallow Foundation Subjected to Vertical Dynamic Load | 10.1007/978-981-33-4001-5_32 |
2021-01-01 | The problem of dynamic deformation of structures damping elements made of metal hollow spheres (MHS) filler is considered. MHS filler is a porous material obtained by joining homogeneous metal hollow spheres. The MHS filler is modeled by a continually homogeneous, orthotropic, physically nonlinear medium. The solution ... | Finite Element Method Study of the Protection Damping Elements Dynamic Deformation | 10.1007/978-3-030-53755-5_4 |
2021-01-01 | The development of traditional CMOS-based logic circuits in terms of speed and energy consumption is approaching the limit. Memristor is a kind of bio-inspired hardware with a special structure, which has the advantages of simple structure, low power consumption and easy integration. It has good application prospects i... | Perceptron Circuit Design of Second Order Damped System Based on Memristor | 10.1007/978-981-16-1354-8_24 |
2021-01-01 | A new proposed control based on the modified Riccati-like equation is developed in this study. The interval type 2 fuzzy model is applied and embedded in the controller for control the uncertainty and also support for calculation progress of the proposed control. To design of the control, the first sliding surface base... | A New Adaptive Hybrid PID Controller for Severe Disturbance of Bus Suspension Featuring Smart Damper | 10.1007/978-3-030-69610-8_4 |
2021-01-01 | Active or passive control strategies are developed for the control of civil structures. Since the structures are huge systems as a mechanical system, the control must be feasible for application proposals and cost efficiency performance. For that reason, structural control methods are still an active research area by o... | Metaheuristic-Based Structural Control Methods and Comparison of Applications | 10.1007/978-981-33-6773-9_12 |
2021-01-01 | The increasing renewables penetration leads to reduction in system inertia and may have negative impact on damping of low-frequency oscillations (LFOs). In this paper, a technique to improve the system small signal stability is proposed using a robust coordinated tuning approach of damping controllers. An improved fitn... | Damping Enhancement of DFIG Integrated Power System by Coordinated Controllers Tuning Using Marine Predators Algorithm | 10.1007/978-981-15-8815-0_15 |
2021-01-01 | This paper focuses on evaluating whether a buckling-restrained brace (BRB) element should be replaced after an earthquake event. For this purpose, a damage index is proposed based on the experimental data obtained from a series of tests conducted on different BRB specimens. In total 19 full-scale BRB specimens were man... | A Damage Index for the Seismic Evaluation of Buckling-Restrained Braces | 10.1007/978-3-030-73932-4_12 |
2021-01-01 | Plants being the producers of food encounter various pests and pathogens, including microbes (virus, bacteria, fungi, protists, nematodes), insect and vertebrates with diverse modes of attack. Although some organisms have a mutualistic/symbiotic association with plants, others are harmful, may greatly impair plant prod... | Microbe-Plant-Insect Interactions: A Comparative Dissection of Interactome | 10.1007/978-981-15-2467-7_15 |
2021-01-01 | Impact dampers of various designs are currently used for mitigating vibrations of industrial components. Although they may generate disturbing noise, these devices offer many advantages, as they are quite robust, exempt from fine-tuning and stand severe temperature and environmental conditions. Moreover, they can be ap... | Experimental Contact Model Calibration for Computing a Vibrating Beam Coupled to a Granular Chain Impact Damper | 10.1007/978-3-030-76517-0_28 |
2021-01-01 | Magnetorheological Dampers (MR) have the ability to mitigate seismic hazards caused to a structure by reducing its potential to undergo large displacements. The objective of the paper is to formulate an analytical modeling technique to perform the hybrid simulation. The seismic response of a single-story frame employed... | Studies on Modeling and Control of RCC Frame with MR Damper | 10.1007/978-981-15-5001-0_18 |
2021-01-01 | Tuned mass dampers (TMDs) and nonlinear energy sinks (NESs) are two viable options for passively absorbing structural vibrations. In seismic applications, a trade-off exists in their performance, because TMDs’ effectiveness varies with the structural stiffness while NESs’ effectiveness varies with the earthquake intens... | Seismic effectiveness and robustness of tuned mass dampers versus nonlinear energy sinks in a lifecycle cost perspective | 10.1007/s10518-020-00973-2 |
2021-01-01 | Reciprocating compressors operated in gas transmission systems are equipped with passive pressure pulsation dampers protecting the system against the negative effects of excessive pulsation and the related dynamic phenomena. The transmission loss characteristics are determined by means of numerical simulations or measu... | Experimental Research into the Influence of Operational Parameters on the Characteristics of Pressure Pulsation Dampers | 10.1007/978-3-030-59509-8_29 |
2021-01-01 | In this study, the analytical Herschel-Bulkley fluid model of a monotube mixed mode MR damper was examined. The MR damper was modeled and simulated by using computational fluid dynamics (CFD) and magnetic finite elements analysis (FEA). The magnetic effects were modeled in a coupled manner with CFD. The actual rheologi... | Numerical analysis of a monotube mixed mode magnetorheological damper by using a new rheological approach in CFD | 10.1007/s00397-020-01252-2 |
2021-01-01 | In current work the unsteady MHD flow behaviour of a fluid of grade three between two infinitely long flat porous plates is scrutinized where the top lamina is fixed and the lower lamina moves with a velocity which vary with respect to time. Then the non linear p.d.e governing the flow behaviour are reduced to a system... | Computational Analysis of Unsteady MHD Flow of Third Grade Fluid Between Two Infinitely Long Porous Plates | 10.1007/978-981-15-4308-1_24 |
2021-01-01 | The COVID-19 outbreak has threatened human life and disrupted economies worldwide. With prepared healthcare systems and governments serving as our best defence, the forecasting of its spread has become imperative. The chapter applies a range of time series forecasting techniques—baseline methods, exponential smoothing,... | A Study of Time Series Forecasting Techniques for COVID-19 Trends | 10.1007/978-3-030-82079-4_1 |
2021-01-01 | This paper proposes a network of neural oscillators having lateral inhibition structures. Our previous research suggested a new control system for active mass dampers (AMDs) consisting of a neural oscillator network and a position controller. However, the proposed system required a large number of neural oscillators fo... | Output Analysis of Neural Oscillator Networks Having Lateral Inhibition Structures | 10.1007/978-3-030-46466-0_44 |
2021-01-01 | In this paper, we discuss the influence of assuming L ^ m regularity of initial data, instead of L ^1, on a heat or damped wave equation with nonlinear memory. We find that the interplay between the loss of decay rate due to the presence of the nonlinear memory and to the assumption of initial data in L ^ m instead of ... | A New Critical Exponent for the Heat and Damped Wave Equations with Nonlinear Memory and Not Integrable Data | 10.1007/978-3-030-61346-4_9 |
2021-01-01 | Neutrophils are the primary innate immune cell involved in acute inflammatory responses to trauma and injury. While the mechanisms used by neutrophils to cause inflammation are designed to protect the host and allow for recovery, many of these same processes can have pathologic outcomes, including contributing to the d... | Neutrophils, Inflammation, and Innate Immunity in Trauma-Induced Coagulopathy | 10.1007/978-3-030-53606-0_13 |
2021-01-01 | We consider the Cauchy problem on R 0 + × R n $$\mathbf {R_{0}^+} \times \mathbf {R^n}$$ for the semilinear damped wave equation u t t ( t , x ) − a 2 ( t ) Δ u ( t , x ) + b ( t ) u t ( t , x ) = | u ( t , x ) | p $$\displaystyle u_{tt}(t,x) - a^2(t) \Delta u(t,x) + b(t) u_t(t,x)= |u(t,x)|{ }^p $$ with decreasing in t... | Critical Exponent for a Class of Semilinear Damped Wave Equations with Decaying in Time Propagation Speed | 10.1007/978-3-030-61346-4_11 |
2021-01-01 | Tuning of structures of short periods to the long period sloshing liquid of a tune liquid damper (TLD) possess difficulty. However, proper tuning of the tuned damper devices is must for the desired control efficiency. To overcome this difficulty, a new implementation is proposed contrary to the conventional rigidly con... | Modified Tuned Liquid Damper for Vibration Control of Short Period Structures | 10.1007/978-981-15-9976-7_24 |
2021-01-01 | Mitigation of pounding between closely spaced building structures, subjected to earthquake excitation, by interconnecting them by friction dampers is investigated. Considering the pounding force and damper frictional force, the non-linear equations of motion of two connected single-degree-of-freedom (SDOF) structural s... | Vibration Control of Seismically Excited Adjacent Buildings Prone to Pounding by Use of Friction Dampers | 10.1007/978-981-15-5862-7_22 |
2021-01-01 | In this paper, an intelligent control technique with ameliorated performance for active half car systems with nonlinearities is presented. In fact, nonlinear characteristics of mechanical items and exogenous environmental disturbances that may deteriorate stiffness-damping parameters are neglected in some applications.... | Online Adaptive MFC for Nonlinear Active Half Car System | 10.1007/978-3-030-76517-0_23 |
2021-01-01 | This study focuses on frame buildings equipped with hysteretic dampers, and presents an energy-based methodology to estimate the earthquake deformation demand after damper installation. The proposed methodology considers not only structural and dynamic characteristics of the main frame and dampers, but also input groun... | An Energy-Based Prediction of Deformation Demand on Low- to Mid-Rise R/C Buildings with Hysteretic Dampers | 10.1007/978-3-030-73932-4_13 |
2021-01-01 | In response spectrum method, the modal seismic response is a combination of the damped periodic part and a rigid part. In high-frequency modes, the damped periodic part of the response is negligible and the response becomes rigid. The proposed methods and the current practices that have been used to account the effect ... | Effect of Rigidity on Seismic Analysis of Structures | 10.1007/978-981-15-5644-9_62 |
2021-01-01 | In this study, a model of the friction force of dampers in a horizontal washing machine is proposed. A MATLAB program is used to determine the parameters for force-velocity relation curve according to Tustin model based on the experimental data of dampers. The two degree of freedom system of horizontal washing machines... | Force-Velocity Relation of Dampers in Horizontal Washing Machines | 10.1007/978-3-030-64719-3_52 |
2021-01-01 | Steel chimney is a kind of high-rise structure, which is usually built in areas with large wind loads. And the possibility of large deformation or even damage caused by wind vibration exists. Suspended tuned mass damper (STMD) has been proved to be an effective vibration control device, which can effectively reduce the... | Research on Suspended Tuned Mass Damper in Wind Vibration Control of the Steel Chimney | 10.1007/978-981-15-8079-6_84 |
2021-01-01 | Liquid column vibration absorber (LCVA) is very much useful to mitigate the responses generated by the dynamic forces due to its cost-effectiveness dynamic vibration absorbing property. LCVA is usually a U-shaped tube having different cross-sectional areas in the vertical and horizontal column, normally filled up with ... | Comparison of Effectiveness of TLCBD Over LCVA in Vibration Control of Structure Under Non-stationary Earthquake | 10.1007/978-981-15-4577-1_26 |
2021-01-01 | In this paper, a dual quaternion-based methodology for computing the forward and inverse kinematic models for a serial manipulator is presented. A dual quaternion-based forward kinematics model is developed for the Kuka LBR IIWA 7 R800 cobot. An inverse kinematics model is developed that uses dual quaternion differenti... | Dual Quaternion-Based Kinematic Modelling of Serial Manipulators | 10.1007/978-981-15-3639-7_1 |
2021-01-01 | Sloshing of liquid in a partially filled container, subjected to higher amplitude of dynamic load, is a complex phenomenon. In shallow water conditions, the natural frequency of sloshing depends on the amplitude of excitation. Sloshing frequency tends to change with increase in amplitude of excitation. The change in na... | Experimental Study on Shallow Water Sloshing | 10.1007/978-981-15-5862-7_46 |
2021-01-01 | An organism’s phenotype can be thought of as consisting of a set of discrete traits, able to evolve relatively independently of each other. This implies that the developmental processes generating these traits—the underlying genotype-phenotype map—must also be functionally organised in a modular manner. The genotype-ph... | Dynamical Modularity of the Genotype-Phenotype Map | 10.1007/978-3-030-71737-7_11 |
2021-01-01 | A friction damper (FD) can be an effective energy dissipation device for the seismic protection of structural systems. The level of the constant slip force in a passive FD is a critical design parameter, since it will determine the amount of energy dissipated by the damper in an earthquake. A passive FD will behave lik... | A Leverage-Type Variable Friction Damper for Seismic Protection of Structural Systems | 10.1007/978-981-15-8079-6_78 |
2021-01-01 | The STARDAMP software tool enables prediction and assessment of the performance of wheel and rail dampers. This paper supports ongoing validation and testing efforts by examining the use of STARDAMP in relation to assessing the performance of rail dampers on slab track with highly resilient fasteners. This track type i... | Track Decay Rate Analysis and Rail Damper Noise Reduction for Slab Tracks | 10.1007/978-3-030-70289-2_69 |
2021-01-01 | This paper introduces a novel adaptive inverse multilayer T-S fuzzy controller (AIMFC) optimally identified with an optimization soft computing algorithm available for a class of robust control applied in uncertain nonlinear SISO systems. The parameters of multilayer T-S fuzzy model are optimally identified by the diff... | Adaptive inverse multilayer fuzzy control for uncertain nonlinear system optimizing with differential evolution algorithm | 10.1007/s10489-020-01819-9 |
2021-01-01 | Necroptosis is a regulated form of necrosis that depends on receptor-interacting protein kinase (RIPK)3 and mixed lineage kinase domain-like protein (MLKL). Necroptotic cells release a variety of cellular and nuclear factors, referred to as danger-associated molecular patterns (DAMPs). We recently developed a förster r... | Time-Lapse Imaging of Necroptosis and DAMP Release at Single-Cell Resolution | 10.1007/978-1-0716-1258-3_29 |
2021-01-01 | There are numerous applications to evaluate the damage caused by subsynchronous resonance (SSR) to a turbine-generator shaft. Despite multiple applications, there are relatively few studies on shaft misalignment in the literature. In this paper, stresses in the existing turbine-generator shaft due to subsynchronous res... | Dampers to Suppress Vibrations in Hydro Turbine-Generator Shaft Due to Subsynchronous Resonance | 10.1007/978-981-15-4308-1_36 |
2021-01-01 | Research on the core technology has obtained a patent for invention authorization of hydraulic controlled vibration damper with vibration energy absorption. The hydraulic cylinder structure is designed by the principle of liquid incompressibility. The hydraulic circuit increases and the gap distance changes due to the ... | Research and Development of Hydraulic Controlled Vibration Damper with Vibration Energy Absorption | 10.1007/978-3-030-72795-6_39 |
2020-12-04 | The implementation of numerical squeeze film damper (SFD) models into rotordynamic study is a time-consuming work since it is challenging to efficiently calculate the SFD forces under a variety of different situations. This paper proposes a new scheme to incorporate SFD models into rotordynamic analysis. A polynomial i... | Vibration analysis of rotor-bearing system using polynomial interpolation for squeeze film damper models | 10.1007/s42452-020-03783-y |
2020-12-01 | In this paper, we introduce a generalization of Lyapunov’s direct method for dynamical systems with fractional damping. Hereto, we embed such systems within the fundamental theory of functional differential equations with infinite delay and use the associated stability concept and known theorems regarding Lyapunov func... | The direct method of Lyapunov for nonlinear dynamical systems with fractional damping | 10.1007/s11071-020-05962-3 |
2020-12-01 | Natural slopes consist of non-homogeneous soil profiles with distinct characteristics from slopes made of homogeneous soil. In this study, the limit equilibrium modified pseudo-dynamic method is used to analyze the stability of two-layered c-ϕ soil slopes in which the failure surface is assumed to be a logarithmic spir... | New pseudo-dynamic analysis of two-layered cohesive-friction soil slope and its numerical validation | 10.1007/s11709-020-0679-3 |
2020-12-01 | An analytical solution for the problem of an immersed flexible and vertical heavy rod subjected to a vertical top motion is developed using the multiple scales method directly applied to the partial differential equations of motion. The obtained results show good agreement with a numerical solution obtained using the f... | A detailed study of the parametric excitation of a vertical heavy rod using the method of multiple scales | 10.1007/s11012-020-01247-6 |
2020-12-01 | Abstract Damping methods for milling vibrations are studied. A mathematical model is developed for the ratio between the amplitude of the forced vibrations and the parameters of the perturbing pulse. The range of pulsed load parameters corresponding to stable milling is established. The parameters of cylindrical mills ... | Stable Milling | 10.3103/S1068798X20120217 |
2020-12-01 | In this study, a coke-shaped steel damper that exhibits in-plane resistance is introduced as a passive damper. The double-coke damper presented in this study applies the concept of reduced beam sections to increase the ductility in the case of a prolonged earthquake. Multiplastic hinges are placed on each strip by sett... | Modified Low-Cycle Fatigue Estimation Using Machine Learning for Radius-Cut Coke-Shaped Metallic Damper Subjected to Cyclic Loading | 10.1007/s13296-020-00377-7 |
2020-12-01 | In this paper, we study the Riemann problem for a 2 × 2 $2 \times 2$ nonstrictly hyperbolic system with linear damping. We introduce the special time-dependent viscosity to obtain approximate solutions. Therefore, we solve the Riemann problem ( 1.1 )–( 1.2 ) by limiting viscosity approach. | Riemann Problem for a
2
×
2
$2 \times 2$
Hyperbolic System with Linear Damping | 10.1007/s10440-020-00350-w |
2020-12-01 | This paper combines the nonlinear Udwadia-Kalaba control approach with the Assumed Mode Method to model flexible structures and derives an attitude controller for a spacecraft. The study case of this paper is a satellite with four flexible cantilever beams attached to a rigid central hub. Two main topics are covered in... | Nonlinear Controller Design for a Flexible Spacecraft | 10.1007/s40295-020-00234-z |
2020-12-01 | We consider the problem of maximal regularity for non-autonomous second order Cauchy problems $$\begin{aligned} \left\{ \begin{array}{l} u''(t)+{\mathcal {B}}(t)u'(t)+{\mathcal {A}}(t)u(t)=f(t) \quad t\text{-a.e.} \\ u(0)=u_{0},\quad u'(0)=u_{1}. \end{array} \right. \end{aligned}$$ u ′ ′ ( t ) + B ( t ) u ′ ( t ) + A (... | Maximal regularity for the damped wave equations | 10.1007/s41808-020-00084-8 |
2020-12-01 | Consider the following damped vibration system $$\begin{aligned} \ddot{u}(t)+q(t)\dot{u}(t)-L(t)u(t)+\nabla W(t,u(t))=0,\ \forall t\in \mathbb {R} \qquad \qquad (1) \end{aligned}$$ u ¨ ( t ) + q ( t ) u ˙ ( t ) - L ( t ) u ( t ) + ∇ W ( t , u ( t ) ) = 0 , ∀ t ∈ R ( 1 ) where $$q\in C(\mathbb {R},\mathbb {R})$$ q ∈ C (... | Infinitely many fast homoclinic solutions for a class of superquadratic damped vibration systems | 10.1007/s41808-020-00052-2 |
2020-12-01 | The aim of this paper is to study bounds for blow-up time to the following viscoelastic hyperbolic equation of Kirchhoff type with initial-boundary value condition: | u t | ρ u t t − M ( ∥ ∇ u ∥ 2 2 ) Δ u + ∫ 0 t g ( t − τ ) Δ u ( τ ) d τ + | u t | m ( x ) − 2 u t = | u | p ( x ) − 2 u . $$ |u_{t}|^{\rho }u_{tt}-M(\|\n... | Bounds for Blow-up Time to a Viscoelastic Hyperbolic Equation of Kirchhoff Type with Variable Sources | 10.1007/s10440-020-00357-3 |
2020-12-01 | Aiming to isolate disturbance vibration for heavy machines with low frequency, a novel hydro-pneumatic vibration isolator with high-static and low-dynamic (HSLD) stiffness is proposed, which contains bellows structure as elastic element and pressurized gas and incompressible liquid as working media. Due to that the nat... | Dynamics and isolation properties for a pneumatic near-zero frequency vibration isolator with nonlinear stiffness and damping | 10.1007/s11071-020-06063-x |
2020-12-01 | 将有限元与质量集中法相结合, 建立了具有橡胶阻尼环滚动轴承支承的柔性转子的动力学模型. 在该模型中, 转子通过 Timoshenko 梁单元离散建模, 支座和轴承外圈采用质量集中法建模, 同时考虑了转子重力、 不平衡力和非线性轴承力的影响. 动力学方程采用精确积分和 Runge-Kutta 混合数值算法求解. 为了验证建模方法的正确性, 在转子-轴承试验台上进行了理论和实验分析, 发现理论与实验研究的误差率小于 10%; 此外, 还分析了橡胶阻尼环对转子-轴承耦合系统动力学特性的影响, 所得结论与实际情况相吻合. 在此基础上, 分别研究了转速和橡胶阻尼环刚度对耦合系统的分岔和混沌行为的影响. 结果表明, 随着转速的增加, 系统进入混... | Dynamic analysis of a flexible rotor supported by ball bearings with damping rings based on FEM and lumped mass theory | 10.1007/s11771-020-4510-z |
2020-12-01 | Purpose The analysis of free vibrations of axisymmetric functionally graded isotropic viscothermoelastic hollow cylinder has been investigated in the radial direction. The material of viscothermoelastic cylinder has been assumed to be graded in the radial direction due to simple exponent law. The governing partial diff... | Analysis of Free Vibrations of Axisymmetric Functionally Graded Generalized Viscothermoelastic Cylinder Using Series Solution | 10.1007/s42417-019-00178-1 |
2020-12-01 | The friction at the contact surfaces of a vehicle body vibration damper, which are moved relatively to each other, influences its transmission behavior at the start of movement (breakaway force) as well as with excitation signals of higher velocity and thus has an impact on the comfort properties of the damper. Accordi... | Analysis and characterization of the friction of vehicle body vibration dampers | 10.1007/s41104-020-00060-3 |
2020-12-01 | This paper describes how overconsolidation affects the shear modulus at small strain ( G _0) for peat, as well as the strain dependence of the shear modulus ( G ) and the damping ratio ( h ) of overconsolidated peat. Hayashi et al. (Soils Found 52(2):299–311, 2012) pointed out that peat deposits tend to be overconsolid... | Shear Modulus and Damping of Peat Subjected to Overconsolidation Stress History | 10.1007/s10706-020-01445-9 |
2020-12-01 | This study proposes Series Vectorial Compensator (SVeC) with Power System Stabilizers (PSSs) to mitigate oscillations in a network. SVeC is a novel Flexible Alternating Current Transmission Systems (FACTS) series device and is generally used for controlling the reactance of a line by varying the duty ratio of ac link. ... | Optimal Control Techniques Design to the Coordinated Control of Series Vectorial Compensator with Power System Stabilizers | 10.1007/s40031-020-00495-0 |
2020-12-01 | Abstract— At present, mechanics of damage media, which studies both the stress–strain state of media and the damage accumulation in materials, is being actively developed. In this study, a self-consistent problem, including the dynamic equation of the theory of elasticity and the kinetic equation of damage accumulation... | Influence of Material Damage on the Rayleigh Wave Propagation along Half-Space Boundary | 10.1134/S0021894420070020 |
2020-12-01 | This study proposes a hybrid control methodology that combines tuned liquid damper (TLD) and active mass damper (AMD) to suppress vibrations of multi-story building structure effectively. To this end, a dynamic model that can predict the vibration of multi-story building structure coupled with TLD and AMD is derived us... | Vibration control of multi-story building structure by hybrid control using tuned liquid damper and active mass damper | 10.1007/s12206-020-1105-4 |
2020-12-01 | A limited gap between closely spaced structural parts may induce internal pounding in seismically isolated structures, because of notable displacement at the level of the isolation system under severe earthquakes. A gap between a fixed-base elevator shaft and the surrounding building is presented here with reference to... | Magnetic damped links to reduce internal seismic pounding in base-isolated buildings | 10.1007/s10518-020-00961-6 |
2020-12-01 | The study discusses the potential use of geosynthetics in isolating the ground vibration emanated from the vertical mode dynamic excitation. A field study was conducted to investigate the screening efficacy of reinforced foundation beds. In the field study, vibration was generated using a mechanical oscillator. Four di... | Isolation Prospects of Geosynthetics Reinforced Soil Beds Subjected to Vibration Loading: Experimental and Analytical Studies | 10.1007/s10706-020-01447-7 |
2020-12-01 | Purpose The dynamic response of pressure monitoring circuits must be evaluated to obtain true invasive blood pressure values. Since Gardner’s recommendations in 1981, the natural frequency and the damping coefficient have become standard parameters for anesthesiologists. In 2006, we published a new dynamic response eva... | Why the natural frequency and the damping coefficient do not evaluate the dynamic response of clinically used pressure monitoring circuits correctly | 10.1007/s00540-020-02843-2 |
2020-12-01 | Employing the methods of separation of variables and matched eigenfunction expansions for velocity potential, analytical solutions are proposed for a water wave radiation problem of a floating semi-porous compound cylinder in finite ocean depth. The configuration of the semi-porous compound cylinder is such that it con... | Hydrodynamic coefficients for a floating semi-porous compound cylinder in finite ocean depth | 10.1007/s40868-020-00086-0 |
2020-12-01 | A high-speed rotating rotor system mounted on a moving vehicle is inevitably subjected to parametric excitations and exciting forces induced by base motions. Dynamic characteristics of a rotor-bearing system supported by squeeze-film damper with retainer spring subjected to unbalance and support motions are investigate... | Nonlinear responses and bifurcations of a rotor-bearing system supported by squeeze-film damper with retainer spring subjected to base excitations | 10.1007/s11071-020-06052-0 |
2020-12-01 | The presented work deals with nonlinear dynamics of a three degree of freedom system with a spherical pendulum and a damper of the fractional type. Vibrations in the vicinity of the internal and external resonance are considered. The system consists of a block suspended from a linear spring and a fractional damper, and... | Dynamics of a coupled mechanical system containing a spherical pendulum and a fractional damper | 10.1007/s11012-020-01203-4 |
2020-12-01 | Abstract Industrial by product dumped from iron making industry (slag) has been modified by various chemical agents, particularly, paraffin wax, liquid nitrile butadiene rubber (NBR) and silane coating agent. The modified slag powder samples were characterized by differential scanning calorimeter (DSC), thermogravimetr... | Modification of Mineral Powder by Various Organic Materials: Their Potential as Reinforcement for Unsaturated Polyester Composites | 10.1134/S1070427220120216 |
2020-12-01 | Applying an exponential damping to seismic wavefield generates artificial low frequencies. Therefore, full waveform inversion (FWI) of such data has a potential to yield long wavelength structures using its artificial low frequencies. If we apply a shifted exponential damping to trace according to the offset distance, ... | Full Waveform Inversion of Exponentially Damped Wavefield Using the Global-Correlation Norm | 10.1007/s00024-020-02593-y |
2020-12-01 | In this study, we have generalized the fractional action integral by using the Saigo-Maeda fractional operators defined in terms of the Appell hypergeometric function of two variables , F _3( a , a ′, β , β ′; γ ; z , ζ ) with complex parameters. We have derived the associated Euler-Lagrange equation and we have ... | Saigo-Maeda Operators Involving the Appell Function, Real Spectra from Symmetric Quantum Hamiltonians and Violation of the Second Law of Thermodynamics for Quantum Damped Oscillators | 10.1007/s10773-020-04627-6 |
2020-12-01 | The effect of ultrasonic impact treatment (UIT) on the damping capacity of pure magnesium is revealed in this paper. The results show that after UIT, the metal underwent dynamic plastic deformation, the damping capacity of pure magnesium was greatly improved, however, as the UIT time and current intensity increased, th... | Study on Improving Damping Capacity of Pure Magnesium by Ultrasonic Impact Treatment | 10.1007/s11665-020-05249-z |
2020-12-01 | Recently, the construction of similar high-rise buildings has increased due to the increasing population. Moreover, due to space constraints, these structures are being built next to each other. When such tall buildings are located in high seismic zones, earthquake protection becomes essential. There have been many stu... | Vibration Control of Dynamically Similar Buildings Optimally Connected by Viscoelastic Dampers | 10.1007/s40030-020-00466-0 |
2020-12-01 | Constrained fourth-order latent differential equation (FOLDE) models have been proposed (e.g., Boker et al. 2020 ) as alternative to second-order latent differential equation (SOLDE) models to estimate second-order linear differential equation systems such as the damped linear oscillator model. When, however, only a re... | A Note on the Usefulness of Constrained Fourth-Order Latent Differential Equation Models in the Case of Small T | 10.1007/s11336-020-09738-x |
2020-12-01 | Non-linear dynamic model of a cable–mass system with a transverse tuned mass damper is considered. The system is moving in a vertical host structure therefore the cable length varies slowly over time. Under the time-dependent external loads the sway of host structure with low frequencies and high amplitudes can be obse... | Non-linear dynamic response of a cable system with a tuned mass damper to stochastic base excitation via equivalent linearization technique | 10.1007/s11012-020-01169-3 |
2020-11-27 | Abstract Over the past decades, experimental and theoretical studies on gas foil bearings have been conducted extensively. The essence of the operation of these bearings lies in the use of a unique underlying support mechanism, whose properties adapt to current operating conditions. The static and dynamic characteristi... | Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction | 10.1007/s40430-020-02720-9 |
2020-11-19 | We consider the reduction of parametric families of linear dynamical systems having an affine parameter dependence that allow for low-rank variation in the state matrix. Usual approaches for parametric model reduction typically involve exploring the parameter space to identify representative parameter values and the as... | Sampling-free model reduction of systems with low-rank parameterization | 10.1007/s10444-020-09825-8 |
2020-11-18 | In this paper, we consider a viscoelastic wave equation with Balakrishnan–Taylor damping and a delay term. Under suitable assumptions on relaxation functions, we establish general decay result for energy. | General decay result of solutions for viscoelastic wave equation with Balakrishnan–Taylor damping and a delay term | 10.1007/s00033-020-01426-1 |
2020-11-01 | A collision between two bodies is a usual phenomenon in many engineering applications. The most important problem with the collision analysis is determining the hysteresis damping factor or the hysteresis damping ratio. The hysteresis damping ratio is related to the coefficient of restitution. In this paper, an explici... | A new model of the contact force for the collision between two solid bodies | 10.1007/s11044-020-09732-2 |
2020-11-01 | In this paper, we consider a viscoelastic plate equation in the presence of a strong time-varying delay, namely; $$\begin{aligned} u_{tt}+\Delta ^2 u-\int _0^t g(t-s)\Delta ^2 u(s)ds-\mu _1\Delta u_t-\mu _2\Delta u_t(\cdot ,t-\tau (t))=0. \end{aligned}$$ u tt + Δ 2 u - ∫ 0 t g ( t - s ) Δ 2 u ( s ) d s - μ 1 Δ u t - μ ... | Decay estimate for a viscoelastic plate equation with strong time-varying delay | 10.1007/s11565-020-00346-2 |
2020-11-01 | The present study develops the dispersion and attenuation characteristics of Rayleigh wave regulations through a pre-stressed Voigt type viscoelastic strip of finite thickness. The displacement expressions of Rayleigh wave in the strip are introduced. The complex frequency equation of the wave motion is thus obtained. ... | Attenuation and dispersion characteristic of Rayleigh waves in a compressed viscoelastic strip: a comparative study | 10.1007/s40590-020-00279-y |
2020-11-01 | A method for constructing nonstationary vibration equations for electro-viscoelastic composite plates with their active damping is described. The problem is solved in an integral Fourier transform frequency space. To construct a multilayer plate model, a discrete structural approach was used, i.e., the plate is divided... | Active Damping of Nonstationary Vibrations of a Three-Layer Electro-Viscoelastic Composite Plate | 10.1007/s11223-021-00241-x |
2020-11-01 | In this manuscript, we present a system consisting of a three-level atom interacting with optical field. We investigate qualitatively the entanglement and atomic (field) geometric phase under the effect of cavity damping. The atom–field entanglement is measured by the negativity. We show that these quantifiers depend s... | Some features of the geometric phase and entanglement of three-level atom under cavity damping effects | 10.1007/s12648-019-01613-5 |
2020-11-01 | The mechanical properties and vibration damping characteristics of cross-ply laminates ([90°/0°/90°] and [0°/90°/0°]), [0°/45°/0°], four-layered angle ply laminate ([90°/0°]_s) and Quasi-isotropic laminates ([0°/90°/45°]_s, [0°/45°/90°]_s,) containing 50 ± 2 wt% of banana fibres in polyester matrix were investigated. T... | Influence of Fibre Inter-ply Orientation on the Mechanical and Free Vibration Properties of Banana Fibre Reinforced Polyester Composite Laminates | 10.1007/s10924-020-01814-8 |
2020-10-31 | In this paper we consider the blow-up of solutions to a weakly coupled system of semilinear damped wave equations in the scattering case with nonlinearities of mixed type. The proof of the blow-up results is based on an iteration argument. We find as critical curve for the pair of exponents ( p , q ) in the nonlinear ... | Nonexistence of global solutions for a weakly coupled system of semilinear damped wave equations in the scattering case with mixed nonlinear terms | 10.1007/s00030-020-00662-8 |
2020-10-28 | Water lubricated guide bearings for hydro turbines and pumps are conventionally designed with multiple axial grooves to provide effectively cooling and flushing away abrasives. Due to the variety of groove configuration in terms of number and size, a predication of their performance is difficult. This paper deals with ... | A New Method to Calculate Water Film Stiffness and Damping for Water Lubricated Bearing with Multiple Axial Grooves | 10.1186/s10033-020-00492-w |
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