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2021-11-02 | Objective Astrocytes participate in the local innate immune response of the central nervous system. In response to stress such as ischemia, activated cells release endogenous factors known as damage-associated molecular patterns (DAMPs). Self-extracellular RNA (eRNA) is such a ubiquitous alarm signal. However, it is un... | Self-extracellular RNA promotes pro-inflammatory response of astrocytes to exogenous and endogenous danger signals | 10.1186/s12974-021-02286-w |
2021-11-01 | Reinforced concrete shear walls are the structural elements that considerably increase the seismic performance of buildings. Fiber elements and fiber-spring elements are used for the modeling of the inelastic behavior of these elements. The Fiber Element Method provides a certain amount of accuracy for the modeling of ... | Numerical simulation of reinforced concrete shear walls using force-based fiber element method: effect of damping type and damping ratio | 10.1007/s10518-021-01221-x |
2021-11-01 | This paper uses TRT-LBM coupled with the effective viscosity to predict squeeze film air damping (SQFD) of micro-beam in the transition regime. The result shows that, in the transition regime, recent MC model underestimates the quality factor for ignoring the gas viscosity effect and recent Reynolds model overestimates... | A TRT-LBM model of squeeze film air damping of micro-beam in the transition regime | 10.1007/s00419-021-02024-x |
2021-11-01 | The subject of this study is a new Process Damping Model approach for milling with flat end milling cutter. Dynamic model of the cutting system was modeled and applied for the milling operation. The machining process is developed mathematically as a complex dynamic cutting model with two degree of freedom. This cutting... | Process damping model approach in milling operations | 10.1007/s40430-021-03201-3 |
2021-11-01 | This paper investigates the steady-state response of a harmonically excited multi-degree-of-freedom (MDOF) system with a Coulomb contact between: (1) a mass and a fixed wall; (2) two different masses; (3) a mass and an oscillating base. Although discrete MDOF models are commonly used at early design stages to analyse t... | Dynamic response of multi-degree-of-freedom systems with a Coulomb friction contact under harmonic excitation | 10.1007/s11071-021-06966-3 |
2021-11-01 | A design for a gas foil bearing with springs for secondary stiffness is presented. The construction of a bearing test rig, designed and built for conducting the tests in order to determine the maximum load capacity of the bearing for various shaft speeds (under normal conditions), is considered. The results of the expe... | Determination of the Maximum Load Capacity of a Gas Foil Journal Bearing | 10.1007/s10556-021-00990-1 |
2021-11-01 | This study is to present a novel way to achieve superior passive vibration isolation by employing a specially designed and compact linkage mechanism. The proposed anti-vibration system has beneficial nonlinear inertia, inspired by swinging motion of human arms, and is constructed with an adjustable nonlinear stiffness ... | Vibration isolation with passive linkage mechanisms | 10.1007/s11071-021-06878-2 |
2021-11-01 | Often, the responses of additive manufactured parts are studied only in the context of static loads, since most consumer-grade additive manufactured parts are not capable of supporting dynamic loads. Here, the effects of fabrication parameters on the vibratory properties of 3D-printed polymer composite beams were studi... | Nonlinear vibratory properties of additive manufactured continuous carbon fiber reinforced polymer composites | 10.1007/s00170-021-07456-x |
2021-11-01 | Reductive perturbation method (RPM) is used to obtain damped forced Kadomtsev–Petviashvili (DFKP) equation for the ion acoustic waves (IAWs) in a magnetized dusty plasma comprising electrons abiding by q -nonextensive velocity distribution, in the presence of external periodic force along with a damping term. A nonstat... | Non-stationary Solitary Wave Solution for Damped Forced Kadomtsev–Petviashvili Equation in a Magnetized Dusty Plasma with q-Nonextensive Velocity Distributed Electron | 10.1007/s40819-021-01168-2 |
2021-11-01 | Background The elastic wave propagation characteristics, especially the local plus resonance phenomenon, affect the stability and the accuracy of the electronic components mounted on the spacecrafts significantly, which implies that the layout of the electronic components in the spacecrafts should be away from the plus... | Wave Propagation in Non-homogeneous Centrosymmetric Damping Plate Subjected to Impact Series | 10.1007/s42417-021-00355-1 |
2021-11-01 | A major source of electric vehicle energy loss is the vibration energy dissipated by the shock absorbers under irregular road excitation, which is particularly severe when active wheel systems are employed because their greater unsprung mass leads to greater shocks and vibrations. Therefore, a tubular linear energy har... | Design, Modeling, and Characterization of a Tubular Linear Vibration Energy Harvester for Integrated Active Wheel System | 10.1007/s42154-021-00144-2 |
2021-11-01 | Purpose The negative stiffness integrated tuned mass damper (NS-TMD) is considered as an interesting and efficient device for passive vibration control. However, design/optimization of NS-TMD may not always lead towards robust performance if there exist uncertainties. In this study, a stochastic design of NS-TMD is pro... | On Stochastic Design of Negative Stiffness Integrated Tuned Mass Damper (NS-TMD) | 10.1007/s42417-021-00356-0 |
2021-11-01 | Prothymosin alpha (ProTα) is involved in multiple cellular processes. Upon serum-free stress, ProTα lacking a signal peptide sequence is non-classically released from C6 glioma cells as a complex with Ca^2+-binding cargo protein S100A13. Thus, ProTα and S100A13 are conceived to be members of damage-associated molecular... | Involvement of SNARE Protein Interaction for Non-classical Release of DAMPs/Alarmins Proteins, Prothymosin Alpha and S100A13 | 10.1007/s10571-020-00950-y |
2021-10-28 | In this paper, the controllability analysis is proposed for both linear and nonlinear higher-order fractional damped stochastic dynamical systems with distributed delay in Hilbert spaces which involve fractional Caputo derivative of different orders. Based on the properties of fractional calculus, the fixed point techn... | Controllability of higher-order fractional damped stochastic systems with distributed delay | 10.1186/s13662-021-03625-0 |
2021-10-22 | The Generalized Reduced Gradient (GRG) and Grey Relation Analysis (GRA) optimization techniques are used to optimize the parameters of shear mode magneto-rheological (MR) damper design to achieve the defined objectives. The purpose is to develop a smart damper for washing machine application. The main objective is to o... | Design and optimization of shear mode MR damper using GRG and GRA methods: experimental validation | 10.1007/s12046-021-01746-6 |
2021-10-19 | This work is concerned with a semilinear non-homogeneous Timoshenko system under the effect of two nonlinear localized frictional damping mechanisms. The main goal is to prove its uniform stability by imposing minimal amount of support for the damping and, as expected, without assuming any relation on the non-constant ... | Uniform stability for a semilinear non-homogeneous Timoshenko system with localized nonlinear damping | 10.1007/s00033-021-01622-7 |
2021-10-19 | In earlier days, the only way to resist the lateral loads was to increase the lateral strength of the structure obtained by making larger cross sections and massive buildings. Structural control is one of the solutions and important topics in both points of view of security and comfort in recent years. To reduce the ef... | Damped outrigger semi-active control for seismic vibration mitigation | 10.1007/s41062-021-00645-3 |
2021-10-18 | In a Hilbert space H $\mathcal{H}$ , we study a dynamic inertial Newton method which aims to solve additively structured monotone equations involving the sum of potential and nonpotential terms. Precisely, we are looking for the zeros of an operator A = ∇ f + B $A= \nabla f +B $ , where ∇ f is the gradient of a continu... | Asymptotic behavior of Newton-like inertial dynamics involving the sum of potential and nonpotential terms | 10.1186/s13663-021-00702-7 |
2021-10-12 | A tall building comprised of tubular frame, central shear core, and outrigger-belt truss systems is considered as an equivalent flexural hollow box beam with lumped masses at each floor level. Natural frequencies and mode shapes of the un-damped hybrid system are obtained by forming mass and stiffness matrices and solv... | An innovative approach for evaluating mode shapes and natural frequencies of tubular frame and damped outriggers | 10.1007/s41062-021-00634-6 |
2021-10-12 | Considering the linked structure concept, a single damper enhances the response of two adjoining structures, becomes an economic alternative for seismic performance enhancement of the adjoining connected structure. A high force-to-volume damper offers a sufficient amount of resistive force by comparatively small size d... | Response control of adjoining structures interconnected with Lead damper | 10.1007/s41062-021-00660-4 |
2021-10-09 | In this work, we consider a quasilinear system of viscoelastic equations with degenerate damping and general source terms. According to some suitable hypothesis, we study the blow-up of solutions. This is the general case of the recent results of Boulaaras’ works (Bull. Malays. Math. Sci. Soc. 43:725–755, 2020 ) and (A... | Blow-up of solutions for a quasilinear system with degenerate damping terms | 10.1186/s13662-021-03609-0 |
2021-10-05 | We introduce and analyze a space-time least-squares method associated with the unsteady Navier–Stokes system. Weak solution in the two dimensional case and regular solution in the three dimensional case are considered. From any initial guess, we construct a minimizing sequence for the least-squares functional which con... | A Fully Space-Time Least-Squares Method for the Unsteady Navier–Stokes System | 10.1007/s00021-021-00627-6 |
2021-10-01 | Abstract The damping properties of the polymer composite materials based on a rubber mixture and thermoplastic elastomer are studied at dynamic compressing loads at temperatures of 23 and –40°C. The ratio of the tangential to the secant dynamic stiffness at temperatures above the polymer crystallization points is found... | Influence of Structure on the Dynamic Properties of Polymer Damping Composite Materials | 10.1134/S0036029521100189 |
2021-10-01 | Similar to synchronous generators (SGs), the phenomenon of low-frequency oscillation (LFO) may occur when virtual synchronous generator (VSG) is involved in power grid, thereby negatively affecting the stability of the power system. In this paper, the oscillation mechanism of the power system composed of a VSG and infi... | Simplified damping analysis and suppression method for low-frequency oscillation introduced by virtual synchronous generator | 10.1007/s43236-021-00293-x |
2021-10-01 | The damping behavior of continuous SiC fiber reinforced aluminum matrix (SiC_f/Al) composite is still poorly understood. This paper examined the temperature dependence and strain amplitude dependence of damping capacities in 30 vol% SiC_f/Al composites including SiC_f/2024Al, SiC_f/6061Al and SiC_f/AlFe5Si2 composites,... | Microstructure and Damping Behavior of Continuous W-Core-SiC Fiber-Reinforced Aluminum Matrix Composites | 10.1007/s10443-021-09920-z |
2021-10-01 | In this study, the use of high damping rubber bearing (HDRB) with various design properties in mitigating the seismic effects for steel buildings was investigated. For this, a generalized demand on the analytical model of HDRB was introduced and eighteen different models of HDRB were examined comparatively. These model... | Effect of Using High Damping Rubber Bearings for Seismic Isolation of the Buildings | 10.1007/s13296-021-00530-w |
2021-10-01 | A novel resilient variable friction damper (RVFD) with a simple construction was proposed. To analyze the effects of loading rate on the stability and energy dissipation performance of the RVFD, two RVFDs were tested under different loading rates and the hysteretic behaviors of the compared with that of the traditional... | Effects of Loading Rates on the Hysteretic Response of Resilient Variable Friction Dampers | 10.1007/s13296-021-00519-5 |
2021-10-01 | A damping model of fiber reinforced composites was established in this study. Meanwhile, the accuracy of the damping model was verified through experiments. Subsequently, the factors affecting the damping ratio and dynamic response under sinusoidal excitation force of fiber reinforced composites were explored and the m... | Damping Model of Fiber Reinforced Composites and Factors Affecting Damping and Dynamic Response | 10.1007/s10443-021-09924-9 |
2021-10-01 | The investigated hybrid carbon fiber reinforced plastics-elastomer-metal laminates (HyCEML) offer the potential of tailored structural materials with adaptable damping properties. Conventional fiber metal laminates, like glass laminate aluminum reinforced epoxy are already widely spread in the aviation industry owing t... | Wide Scale Characterization and Modeling of the Vibration and Damping Behavior of CFRP-Elastomer-Metal Laminates—Comparison and Discussion of Different Test Setups | 10.1007/s10443-021-09934-7 |
2021-10-01 | Design of retaining walls (RWs) in earthquake (EQ)-prone areas requires the knowledge of the distribution of lateral earth pressure behind it. The lateral earth pressure acting on RW in case of dynamic/ seismic loading comprises of two components: (a) earth pressure due to static loading and (b) dynamic incremental pre... | Methodologies Available for the Determination of Seismic Active Thrust Acting on Retaining Walls: A Critical Review | 10.1007/s40098-020-00495-3 |
2021-10-01 | A forced damped harmonic oscillator model of the dipole plasmon mode is illustrated by the theoretical derivation and the simulation based on the metal ellipsoids. The analytical expression of the restoring force is derived. The displacement of the oscillator, which is the phenomenological relative displacement of the ... | Forced Damped Harmonic Oscillator Model of the Dipole Mode of Localized Surface Plasmon Resonance | 10.1007/s11468-021-01408-7 |
2021-10-01 | The magnetorheological damper has variable damping characteristic and the damping force is controllable, which made them employable in the semi-active suspension system of various engineering applications. Basically, there are three types of MR damper i.e monotube, twin-tube and double end. In this paper, a double-ende... | Estimation of Damping Force of double Ended Magnetorheological Damper through one way coupled CFD and FEA Analysis | 10.1007/s40032-021-00737-0 |
2021-10-01 | Impact dampers (ID) are one of the passive dampers for controlling undesirable vibration and are suitable to operate in harsh environments and effective over a wide range of frequencies. These dampers can be classified as single-unit or multi-unit. The multiple-unit impact damper where is composed of one cavity and som... | Experimental Investigation of Vibratory and Acoustical Behavior of Multiple-Unit Impact Dampers in Free Vibration Reduction | 10.1007/s13296-021-00518-6 |
2021-10-01 | This paper studies the optimization design of sandwich structures with lattice core and viscoelastic layers for suppressing structural resonance response in the frequency domain. A concurrent optimization scheme is proposed to simultaneously optimize the damping material topology in the viscoelastic layers and the size... | Concurrent optimization of sandwich structures lattice core and viscoelastic layers for suppressing resonance response | 10.1007/s00158-021-02943-x |
2021-10-01 | Utilization of a communication network to transmit remote-control signals might introduce time delay into the control loop, which degrades the controller efficacy. This paper proposes a new design of wide-area damping controller based on scattering transformation to enhance power system stability. The proposed control ... | Delay-Independent Wide-Area Damping Control Using Scattering Transformation | 10.1007/s13369-020-05209-8 |
2021-10-01 | The LCL type active power filter (APF) with a traditional repetitive controller has drawbacks in terms of poor dynamic performance, large steady-state error, and difficult digital implementation. A fast repetitive control (RC) algorithm was proposed in this paper in an effort to improve the APF dynamic performance with... | LCL APF based on fractional-order fast repetitive control strategy | 10.1007/s43236-021-00301-0 |
2021-10-01 | The present study is an attempt to investigate structures equipped with friction dampers under the influence of near-field earthquakes based on Stribeck friction behavior of velocity function. At present, the cyclic behavior of friction dampers in structural design engineering software is simple and based on the Coulom... | Effects of Stick-Slip in Behavior of Structures with Friction Damper under Near-Field Earthquakes | 10.1007/s12205-021-1324-y |
2021-10-01 | Abstract This paper considers and analyzes the properties and characteristics of electromechanical magnetorheological dampers that are able to quickly change their rigidity in variable operating conditions. It is shown that the correct development of these dampers and the refined definition of their characteristics are... | Analysis of Properties and Refined Definition of Characteristics of Electromechanical Magnetorheological Dampers | 10.3103/S1068371221100084 |
2021-10-01 | The optimum damping and tuning frequency ratio of the tuned inerter damper (TID) for the base-isolated structure is obtained using the numerical searching technique under stationary white-noise and filtered white-noise earthquake excitation. The criterion selected for optimality is the minimization of the mean-square r... | Optimum Tuned Inerter Damper for Base-Isolated Structures | 10.1007/s42417-021-00309-7 |
2021-10-01 | Purpose Sloshing is undesirable phenomenon and may invite instability in any type of tank partially filled with liquid. For a specially designed circular cylindrical container filled with an inviscid, incompressible, and homogenous liquid, if an annular baffle is attached to the outer cylinder wall in the annular regio... | Study on Liquid Sloshing in an Annular Rigid Circular Cylindrical Tank with Damping Device Placed in Liquid Domain | 10.1007/s42417-021-00314-w |
2021-10-01 | A vibrating screen is widely used in raw coal screening, but intensive resonance in the startup and shutdown stages shortens the service life of the vibrating screen and generates vibration damage to surrounding buildings. Therefore, we designed a novel vibration isolator based on a magnetorheological damper, aiming to... | A novel vibration isolator for vibrating screen based on magnetorheological damper | 10.1007/s12206-021-0906-4 |
2021-10-01 | The effectiveness of the series tuned mass dampers (STMDs) in reducing the dynamic vibrations of the structures under the ground motion is investigated, and their optimum parameters are obtained based on the simulated annealing (SA) optimization. The STMD is one of the most well-known passive control devices which cons... | Design of series tuned mass dampers for seismic control of structures using simulated annealing algorithm | 10.1007/s00419-021-02013-0 |
2021-10-01 | We study the dissipative dynamics of a single quantum harmonic oscillator subjected to parametric driving within an effective Hamiltonian approach. Using the Liouville–von Neumann approach, we show that the time evolution of a parametrically driven dissipative quantum oscillator has a strong connection with the classic... | Role of dissipation in the stability of a parametrically driven quantum harmonic oscillator | 10.1007/s40042-021-00260-6 |
2021-09-30 | The quality factor is a key parameter of micro-electro-mechanical system resonators, and the internal friction of structural materials in the micro resonator caused by thermoelastic damping has been limiting the improvement of the quality factor. In this paper, thermoelastic damping models of trilayered composite micro... | Analysis of thermoelastic damping in trilayered composite microplates based on three-dimensional heat conduction | 10.1007/s40430-021-03182-3 |
2021-09-29 | This manuscript focuses on the study of the existence of a solution for an abstract Cauchy problem involving a wave equation with a monotone operator damping and nonlinear source term. We apply the potential well and prove the global weak solutions and the exponential stability for initial data in the set of stability ... | Abstract Wave Equation with Monotone Operator Damping in Banach Spaces | 10.1007/s00025-021-01514-2 |
2021-09-29 | The double-beam system finds many applications in various engineering fields due to its light-weight, sufficient rigidity (flexibility), and robust and reliable performance. The concentrated masses are frequently attached to the double-beam system, yet few related studies are available in the literature. This paper inv... | Free and forced vibration analysis of double-beam systems with concentrated masses | 10.1007/s40430-021-03167-2 |
2021-09-21 | Background A shock-absorbing pylon (SAP) is a modular prosthetic component designed to attenuate impact forces, which unlike traditional pylons that are rigid, can compress to absorb, return, or dissipate energy. Previous studies found that walking with a SAP improved lower-limb prosthesis users’ comfort and residual l... | Reducing stiffness of shock-absorbing pylon amplifies prosthesis energy loss and redistributes joint mechanical work during walking | 10.1186/s12984-021-00939-8 |
2021-09-18 | We study the influence of the factor of electron-ion collisions on the solution of the Cauchy problem in the one-dimensional relativistic model of cold plasma and show that, depending on their intensity and initial data, two scenarios are possible: either the solution remains smooth and stabilizes to a stationary state... | Stabilization and blowup in the relativistic model of cold collisional plasma | 10.1007/s00033-021-01615-6 |
2021-09-01 | In the present work, we investigate the global existence and uniform decay rates of solutions to the Cauchy problem in $$\mathbf {R}^{n}$$ R n ( $$n\ge 1)$$ n ≥ 1 ) related to the dynamic behavior of evolution equations accounting for rotational inertial forces along with a linear viscoelastic memory damping arising in... | Energy Decay Estimates of Solutions for Viscoelastic Damped Wave Equations in
$$\mathbf {R}^{n}$$
R
n
| 10.1007/s40840-021-01097-9 |
2021-09-01 | Due to increase in population, industrialisation and a lack of space in the urban areas of Surat city in Gujarat (India), numerous buildings are being constructed in the vicinity of the railway tracks. The perspective is further aggravated by the proposal for a high-speed corridor (≥ 200 kmph) connecting two key Indian... | Application of Quarter Car Model for Assessment of Attenuation Characteristics of Soil at Low Strain | 10.1007/s40515-020-00139-2 |
2021-09-01 | We study the dynamics of perturbations around an inhomogeneous stationary state of the Vlasov-HMF (Hamiltonian Mean-Field) model, satisfying a linearized stability criterion (Penrose criterion). We consider solutions of the linearized equation around the steady state, and prove the algebraic decay in time of the Fourie... | On Linear Damping Around Inhomogeneous Stationary States of the Vlasov-HMF Model | 10.1007/s10884-021-10044-y |
2021-09-01 | Background Magneto-rheological (MR) dampers have a promising future for application in automotive semi-active suspensions. The damping force produced by MR dampers can be modulated by controlling the electric current supplied to it. Purpose The present work explores a twin-tube MR damper working in valve mode for appli... | Performance Evaluation of a Single Sensor Control Scheme Using a Twin-Tube MR Damper Based Semi-active Suspension | 10.1007/s42417-021-00290-1 |
2021-09-01 | Abstract The movement of an elastic panel is considered in an ideal liquid flow. It is assumed that the panel vibrates with small amplitude and is subject to external mechanical effects to resist these vibrations. The problem of optimizing the vibration damping process is formulated followed by solving through estimati... | Optimum Damping Vibrations in a Panel Undergoing Translational Movement in Liquid Flow | 10.3103/S0025654421070062 |
2021-09-01 | The response behavior of two adjacent single-degree-of-freedom structures connected with Friction damper is investigated. The ground motion acceleration is modeled as non-stationary random process as well as stationary white-noise random excitation. The governing equations of motion of the connected structures are form... | Random response analysis of adjacent structures connected with friction damper | 10.1007/s42107-021-00369-w |
2021-09-01 | Abstract This article investigated the effect of Mg content (4.5, 6.5 and 9.2, in wt%) on the damping capacities of Al–Mg alloys. The results indicate that the damping behavior can be divided into three regions. Region I refers to the low strain amplitude region ( ε < 5 × 10^−5), where the damping capacity decreases w... | Effect of Mg Content on the Damping Behavior of Al–Mg Alloys | 10.1007/s12540-020-00695-9 |
2021-09-01 | In this work, we consider a system of two wave equations coupled by velocities in a one-dimensional space, with one boundary fractional damping. First, we show that the system is strongly asymptotically stable if and only if the coupling parameter b of the two equations is outside a discrete set of exceptional real val... | The influence of the coefficients of a system of wave equations coupled by velocities on its stabilization | 10.1007/s40324-020-00233-y |
2021-09-01 | This paper aims to study the well-posedness and the stability of two thermoelastic systems. The derivation of the first system is based on a classical coupling between the mechanical equations of Timoshenko and the thermal effects which are based on the conductivity of Fourier’s law. Whereas, the second system is deriv... | Well-posedness and energy decay for some thermoelastic systems of Timoshenko type with Kelvin–Voigt damping | 10.1007/s40324-021-00239-0 |
2021-09-01 | A steel slit damper has been used to enhance the seismic performance of structures with several advantages. The damper can be easily manufactured at a low cost. Furthermore, it can dissipate a significant amount of seismic energy through the stable hysteretic behavior of steel. This study presents a preliminary investi... | Preliminary study on a composite steel slit damper | 10.1007/s12206-021-0806-7 |
2021-09-01 | Abstract We have investigated a class of materials whose experimental stress–strain behavior does not allow them to be considered plastic or elastic. They are not elastic since unloading occurs along a curve significantly different from the loading curve; nor are they plastic since in a full loading–unloading cycle, th... | NUMERICAL STUDY OF WAVE PROPAGATION IN NONLINEAR DISSIPATIVE MATERIAL | 10.1134/S0021894421050126 |
2021-09-01 | In this paper, we investigate the existence of a local solution in time and discuss the exponential asymptotic behavior to a weakly damped wave equation involving the variable-exponents u t t − M ∇ u t 2 Δ u + ∫ 0 t g t − s Δ u s d s + γ 1 u t + u t k x − 1 u t = u p x − 1 u in Ω × ℝ + $$ \begin{array}{@{}rcl@{}} &&u_{... | Existence and Asymptotic Behavior of Solutions for Degenerate Nonlinear Kirchhoff Strings with Variable-Exponent Nonlinearities | 10.1007/s40306-021-00420-7 |
2021-09-01 | Abstract The hydrodynamic action on long thin beams executing bending resonance vibrations in a fluid near a plane rigid surface (surface) is investigated. The model of quasi-two-dimensional interaction between the fluid and the beam is used, according to which the hydrodynamic action on any beam cross-section can rega... | Hydrodynamic Damping of Beam Oscillations near a Surface | 10.1134/S0015462821050050 |
2021-09-01 | Inter-storey seismic isolation is increasingly gaining attention. One of the main related issues is the need to limit the relative displacement between substructure and superstructure, while maintaining a good seismic performance of the superstructure. As shown in some studies, fluid viscous dampers (FVDs) mounted in i... | Evaluation of optimal FVDs for inter-storey isolation systems based on surrogate performance models | 10.1007/s10518-021-01134-9 |
2021-09-01 | The study aims at vibration control of laminated plates by the active constraining layer damping ( ACLD ) treatment incorporating the Murakami zig-zag function ( MZZF ) while deriving the displacement fields. The control is achieved by activating the ACLD patches by supplying the control voltage. The ACLD patch has two... | Smart control of laminated plates using Murakami zig-zag functions | 10.1007/s10999-021-09542-0 |
2021-09-01 | Abstract One-dimensional isolated quantum rings in a perpendicular magnetic field with the Rashba spin–orbit coupling parameter changing along the ring are investigated. The electronic spectra and non-damping (persistent) currents of such ring structures are calculated at different structural parameters and magnetic fl... | Electronic States and Persistent Currents in Rings with Inhomogeneous Rashba Spin–Orbit Coupling | 10.1134/S106378262109013X |
2021-09-01 | Conventional dynamic positioning (DP) systems on larger ships compensate primarily for slowly time-varying environmental forces. In doing so, they use wave filtering to prevent the DP from compensating for the first-order wave motions. This reduces wear and tear of the thruster and machinery systems. In the case of sma... | Wave motion compensation in dynamic positioning of small autonomous vessels | 10.1007/s00773-020-00765-y |
2021-09-01 | Sound radiation from thin metal plates has consistently been recognized as a severe noise problem. One of the most popular approaches to suppressing this noise is applying viscoelastic layers, also called free layer damping (FLD), on the plate surface, which can damp the structural motion and minimize the radiated soun... | Experimental and Numerical Investigation of Sound Radiation from Thin Metal Plates with Different Thickness Values of Free Layer Damping Layers | 10.1007/s40857-021-00241-6 |
2021-09-01 | Design sensitivity analysis (DSA) of transient responses, which are indispensable in gradient-based time domain optimization, often requires excessive computational resources for viscoelastically damped systems to directly differentiate and integrate the full-order model (FOM). In this paper, an efficient model-order r... | Design sensitivity analysis for transient responses of viscoelastically damped systems using model order reduction techniques | 10.1007/s00158-021-02937-9 |
2021-09-01 | Chaotic neural networks are versatile systems that attract the attention of researchers while the control of their output is a challenging problem. The objective of this paper is to control chaotic neural networks by a novel combinatorial method adopted from two controlling strategies: the threshold and the damping mec... | State Feedback Method to Control Chaotic Neural Network Based on the Dynamic Phase-Space Constraint | 10.1007/s40998-021-00407-y |
2021-09-01 | The nonlinear dynamic characteristics of a rod fastening rotor-bearing system considering internal damping are investigated in this paper. The governing equations of motion of the rod fastening rotor system, in consideration of nonlinear oil-film force and internal damping, are derived by using finite element method ba... | Nonlinear dynamic response and stability of a rod fastening rotor with internal damping effect | 10.1007/s00419-021-01981-7 |
2021-09-01 | In the study of the cross-flow vortex-induced vibration of the cylinder, it is found that with the increase in the Reynolds number, the upper branch of the vibration amplitude and the lock-in region show an increasing trend. Currently, there are relatively few studies on two-degree-of-freedom VIV at high Reynolds numbe... | Modification and application of low Reynolds number k–ɛ turbulence model to vortex-induced vibration at subcritical Reynolds number range | 10.1007/s00773-020-00749-y |
2021-09-01 | In this paper, a new Kelvin-Voigt type beam model of a microelectromechanical resonator made of power-law materials taking into account internal strain-rate damping is proposed and the corresponding lumped-parameter model is derived. Analytical formulas of the lumped parameters in the model are presented. And the pull-... | Nonlinear dynamical analysis of some microelectromechanical resonators with internal damping | 10.1007/s10409-021-01114-x |
2021-09-01 | Dissipative kinetic models inspired by neutron transport are studied in a (1 + 1)-dimensional context: first, in the two-stream approximation, then in the general case of continuous velocities. Both are known to relax, in the diffusive scaling, toward a damped heat equation. Accordingly, it is shown that “uniformly acc... |
L
${\mathscr{L}}$
-Splines as Diffusive Limits of Dissipative Kinetic Models | 10.1007/s10013-020-00461-9 |
2021-09-01 | This article deals with free and forced vibration responses of the viscoelastic parabolic arches of variable thickness. Firstly, considering the effects of shear deformation and damping, time-dependent motion equations of in-plane loaded parabolic arches are obtained. Subsequently, the Laplace transform is applied to t... | In-plane vibration analysis of parabolic arches having a variable thickness | 10.1007/s40435-020-00727-7 |
2021-09-01 | Storage racks are nonstructural components mainly designed to support the vertical load of goods. During strong external loads such as an earthquake, which acts in the lateral direction of the racks, stored goods become structurally vulnerable. To identify and reinforce the vulnerable parts of storage racks and improve... | Development of Viscoelastic Damper System to Improve Seismic Performance of Storage Racks | 10.1007/s12205-021-1024-7 |
2021-09-01 | Abstract A model of dynamic deformation and fracture of composite materials is developed. This model accounts for the significant nonlinearity of shock loading diagrams with hardening, which depends on strain rate. An approach is used in which the dependence of ultimate strength on damage parameters and their variation... | SIMULATING AN IMPACT ON COMPOSITE DAMPING ELEMENTS | 10.1134/S0021894421050102 |
2021-09-01 | We investigate the asymptotic properties of the trajectories generated by a second-order dynamical system with Hessian driven damping and a Tikhonov regularization term in connection with the minimization of a smooth convex function in Hilbert spaces. We obtain fast convergence results for the function values along the... | Tikhonov regularization of a second order dynamical system with Hessian driven damping | 10.1007/s10107-020-01528-8 |
2021-09-01 | Abstract A problem of damping vibrations of a smart structure consisting of elastic and viscoelastic materials and piezoelements with connected shunt circuits is considered. It is proposed to replace the classical resistor in the shunt circuit by an element made of an electroconducting material, in particular, a polyme... | APPLICATION OF ELECTROCONDUCTING COMPOSITE MATERIALS FOR ADDITIONAL DAMPING OF SMART SYSTEMS BASED ON PIEZOELEMENTS | 10.1134/S0021894421050059 |
2021-09-01 | Impact together with friction can be widely found in the mechanical engineering. Although some scholars have investigated the stochastic systems with impact and friction, they only involve the integer-order systems and do not consider the fractional-order cases. In fact, for the system with viscoelastic material, the d... | Stochastic bifurcation analysis of a friction-damped system with impact and fractional derivative damping | 10.1007/s11071-021-06806-4 |
2021-09-01 | This study aims to present a method for matching the stiffness and damping of a magneto-rheological (MR) air suspension system that will ensure optimal ride comfort of a road vehicle traveling on roads with different roughness and speeds. The authors study the matching of the damping coefficient with the damping ratio,... | Comfort-oriented Semi-active Matching Design with a Magneto-Rheological Air Suspension Mechanism | 10.1007/s40997-020-00393-2 |
2021-09-01 | This paper presents a practical multi-level performance-based optimisation method of nonlinear viscous dampers (NVDs) for seismic retrofit of existing substandard steel frames. A Maxwell model is adopted to simulate the behaviour of the combined damper-supporting brace system, with a fractional power-law force–velocity... | Multi-level performance-based design optimisation of steel frames with nonlinear viscous dampers | 10.1007/s10518-021-01152-7 |
2021-09-01 | This paper introduces an eccentric brace system (EBS) based on an energy dissipation device for seismic retrofitting. Particularly, an EBS-based seismic reinforcement method (SRM) is proposed, and a damper system is constructed based on this method by considering performance enhancement and cost reduction. In a column ... | Seismic Reinforcement System of RC Structure Using Eccentric Brace Frame | 10.1007/s40999-021-00616-w |
2021-09-01 | This paper presents a displacement-based seismic design method for building structures equipped with viscoelastic dampers (VEDs) featuring strong nonlinear characteristics. First, major insights from recent analytical and experimental research on this type of VEDs, including their behavior and sources of nonlinearity, ... | A displacement-based seismic design method for building structures with nonlinear viscoelastic dampers | 10.1007/s10518-021-01135-8 |
2021-09-01 | Wave characteristics of solitons with damped structures in a four-component plasma fluid having positive and negative ions, nonthermal distributed positrons and electrons have been studied. The damped Kadomtsev–Petviashvili (DKP) equation has been obtained in a small amplitude limit. The nonlinear criticality of DKP is... | Effects of the ionic masses and positron density on the damped behavior in nonthermal collisional plasmas | 10.1007/s12648-020-01831-2 |
2021-09-01 | In order to effectively suppress the resonance problem of photovoltaic grid-connected system, an optimization method of active damping resonance suppression is proposed by combining active damping notch control method and active damper method. The resonance mechanism of photovoltaic grid-connected system is analyzed ba... | Active Damping Resonance Suppression and Optimization of Photovoltaic Cluster Grid Connected System | 10.1007/s42835-021-00805-6 |
2021-09-01 | This paper focuses on the influence mechanism of magnetorheological damper (MR damper) on the dynamic characteristics of a rotor system and its damping effect. In this work, the structure of an MR damper in the form of a double coil is designed. The magnetic circuit of the MR damper is analysed by the finite element me... | Vibration suppression of a rotor system with a nonlinear MR damper | 10.1007/s00419-021-01993-3 |
2021-08-31 | This article performs an analytical study on the damping vibration behavior of metal foam nanocomposite plate reinforced with graphene oxide powders (GOPs) in thermal environment. The GOPs are dispersed through the thickness of the structure according to three functionally graded (FG) and one uniform distribution patte... | Analytical study of the damping vibration behavior of the metal foam nanocomposite plates reinforced with graphene oxide powders in thermal environments | 10.1007/s43452-021-00269-5 |
2021-08-21 | This paper studies the Cauchy problem of the 3D incompressible micropolar equations with a damping term σ | u | β − 1 u $\sigma |u|^{\beta -1}u$ ( σ > 0 , 1 ≤ β < 3 $\sigma >0, 1\le \beta <3$ ). It is shown that the strong solutions exist globally for any 1 ≤ β < 3 $1\le \beta <3$ . | A note on global existence of strong solution to the 3D micropolar equations with a damping term | 10.1186/s13661-021-01548-z |
2021-08-10 | The goal of the present paper is to study the viscoelastic wave equation with variable exponents $$\begin{aligned} u_{tt}-\Delta _{p(x)}u-\Delta u+\int _0^tg(t-s)\Delta u(s)\mathrm{{d}}s-\Delta u_t=|u|^{q(x)-2}u \end{aligned}$$ u tt - Δ p ( x ) u - Δ u + ∫ 0 t g ( t - s ) Δ u ( s ) d s - Δ u t = | u | q ( x ) - 2 u und... | Study of a Viscoelastic Wave Equation with a Strong Damping and Variable Exponents | 10.1007/s00009-021-01826-1 |
2021-08-07 | By virtue of thermo-entangled state representation (TESR) and the technique of integration within an ordered product of operators, we solve the master equations of density operators in the amplitude damping model and examine firstly how the orthogonal coherent state (OCS) evolves in this model. The evolution formula of... | Decoherence of orthogonal coherent state in the amplitude damping model | 10.1007/s12043-021-02169-y |
2021-08-04 | This paper considers a one-dimensional piezoelectric beams with magnetic effect damped with a weakly nonlinear feedback in the presence of a nonlinear delay term. Under appropriate assumptions on the weight of the delay, we establish an energy decay rate, using a perturbed energy method and some properties of a convex ... | Energy decay for a weakly nonlinear damped piezoelectric beams with magnetic effects and a nonlinear delay term | 10.1007/s00033-021-01593-9 |
2021-08-04 | An investigation on ion acoustic solitary waves has been presented in a weakly ionized plasma in the occurrence of ion-neutral collision with united effects of trapped and non-thermal electrons. Ion-neutral collision plays a very important role on the propagation of solitary waves in a weakly ionized plasma. In this wo... | Ion-Neutral Collisional Effect on Solitary Waves in Weakly Ionized Plasma with Cairns–Gurevich Distribution of Electrons | 10.1007/s40819-021-01113-3 |
2021-08-01 | In this paper, we consider a wave equation with a time delay velocity and source terms. Using the semi-group theory, we establish the existence of solutions of the problem and we prove a decay rate estimate for the energy by introducing suitable Lyapunov functionals. We also prove that the solution blows up in finite t... | Blow-up and asymptotic behavior for a wave equation with a time delay condition of fractional type | 10.1007/s12215-020-00545-y |
2021-08-01 | Magneto-rheological (MR) dampers using MR fluids with controllable rheological properties are mainly utilized in automobiles, structures, electrical transmission lines, medical applications, agricultural engineering, and military equipment. This paper presents a comprehensive review of bypass MR dampers. The principles... | State-of-the-art developments of bypass Magnetorheological (MR) dampers: A review | 10.1007/s13367-021-0018-9 |
2021-08-01 | This paper presents an online non-model-based scheme to voltage and frequency control of microgrids in the presence of inverter-based distributed energy resources (DERs). For developing proposed controller, considering adaptive control concept, a central controller is designed through aggregation distribution procedure... | Central Damping Controller for Microgrid Voltage and Frequency Dynamic Stability Using Adaptive Artificial Neural Network | 10.1007/s40313-021-00726-9 |
2021-08-01 | We study the Cauchy problem for quasilinear parabolic inequalities containing squares of the first derivatives of an unknown function (the so-called nonlinearities of the KPZ type). The coefficients of the leading nonlinear terms of the inequalities considered either can be continuous functions (the regular case) or ca... | On Qualitative Properties of Sign-Constant Solutions of Some Quasilinear Parabolic Problems | 10.1007/s10958-021-05472-6 |
2021-08-01 | Abstract— The formation of dusty plasma due to photoelectric and electrostatic processes in the near-surface layer of the illuminated part of Deimos, the satellite of Mars, is discussed. The parameters characterizing the trajectories of motion of dust grains are determined on the basis of a physico-mathematical model f... | Non-Stationary Processes during the Formation of Dusty Plasma at the Surface of Deimos, the Satellite of Mars | 10.1134/S1063780X21070084 |
2021-08-01 | In this paper, we study the bounded traveling wave solutions for the Boussinesq equation with dissipative term by using the theory of planar dynamical systems, and reveal the relationships between the behaviors of bounded traveling wave solutions and the dissipation coefficient. The bell profile solitary wave solution ... | Qualitative analysis and bounded traveling wave solutions for Boussinesq equation with dissipative term | 10.1007/s11071-021-06750-3 |
2021-08-01 | This work presents the design optimization and numerical investigation results to evaluate the vibration control performance of a novel hybrid type magnetorheological (MR) damper. Since the proposed hybrid type MR damper has both an electromagnet and permanent magnets, it is possible to design a compact-sized damper wi... | Design optimization and performance evaluation of hybrid type magnetorheological damper | 10.1007/s12206-021-0726-6 |
2021-08-01 | Magneto-Rheological (MR) fluid is a controllable material upon the applied magnetic field, and various MR dampers with different structures are designed to take advantage of this unique property. In the current paper, the squeeze mode MR damper is analyzed. The two-dimensional MR fluid squeeze flow in the damper is sim... | Simulation on hysteresis characteristic of squeeze mode magneto-rheological damper based on non-convex constitutive relation | 10.1007/s13367-021-0020-2 |
2021-08-01 | Magnetorheological (MR) dampers are becoming popular smart devices with controllable higher damping properties. This paper presents an inclusive review of energy harvesting MR dampers. The classifications of energy harvesting MR dampers, operating principles, structural design, mathematical models, fluid models, experi... | Recent developments of regenerative magnetorheological (RMR) damper: A review | 10.1007/s13367-021-0017-x |
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