publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2014-07-01 | The features of an elastic object controlled by an electric drive in the frequency region are considered, which is followed by an analysis of transitional processes in the electric drive during damping of elastic vibrations. Emphasis is laid on the basic components of the electric drive that enable it to absorb elastic... | Evaluating the damping capacity of a recitifier drive with elastic couplings | 10.3103/S1068371214070049 |
2014-07-01 | The magnetoelectric-damper geometry and influence of mechanical parameters onthe axial forces and on the electromagnetic processes in the damper are investigated. An analytic method for determining the magnetoelectric-damper axial forces is developed, and bases are given for a rotor with projections designed for minimi... | An investigation on the influence of rotor geometry on axial forces in the magnetoelectric damper of a suspension system | 10.3103/S1068371214070062 |
2014-07-01 | We obtain an exact solution to the problem of damped rotation of a solid cylinder and the surrounding viscous liquid which is at rest at infinity. We uncover a series of nontrivial characteristics of the dynamics of this hydromechanical system and establish in particular that the liquid can move faster than the boundar... | On a damped motion of a hydromechanical system | 10.1134/S1990478914030120 |
2014-06-01 | Dynamic and static magnetizations of an exchange biased bilayer system which is constructed as a proximity of a CoO layer on an Fe-layer grown on the (100) oriented MgO substrate by ion beam sputtering technique have been investigated by ferromagnetic resonance (FMR) and vibrating sample magnetometry (VSM) techniques. ... | Ferromagnetic Resonance Studies of Exchange Biased CoO/Fe Bilayer Grown on MgO Substrate | 10.1007/s10948-013-2464-1 |
2014-06-01 | In this paper, an interconnected wave-ODE system with K-V damping in the wave equation and unknown parameters in the ODE is considered. It is found that the spectrum of the system operator is composed of two parts: Point spectrum and continuous spectrum. The continuous spectrum consists of an isolated point $$- \tfrac{... | Spectral analysis and stabilization of a coupled wave-ODE system | 10.1007/s11424-014-2219-5 |
2014-06-01 | This paper presents a theoretical investigation of squeeze film flow in systems employing microplates parallel to a substrate and undergoing large amplitude normal vibration. Most previous models of squeeze film damping assume small oscillation amplitude with linear system behavior, but it is often unclear how small th... | Limits of linearity in squeeze film behavior of a single degree of freedom microsystem | 10.1007/s10404-013-1278-6 |
2014-06-01 | A numerical solution based on the Steffensen stable point iterative method is proposed to resolve the transcendental frequency equation of a stay cable-damper system. The frequency equation, which considers clamped supports and flexural rigidity of the cable, is intended to investigate the influence of the parameters o... | Dynamic properties analysis of a stay cable-damper system in consideration of design and construction factors | 10.1007/s11803-014-0233-1 |
2014-06-01 | This paper investigates mathematical modelling of response amplitude operator (RAO) or transfer function using the frequency-based analysis for uncoupled roll motion of a floating body under the influence of small amplitude regular waves. The hydrodynamic coefficients are computed using strip theory formulation by inte... | Mathematical modelling of response amplitude operator for roll motion of a floating body: Analysis in frequency domain with numerical validation | 10.1007/s11804-014-1249-7 |
2014-06-01 | In this paper, we consider the complex Ginzburg–Landau equation $${u_t = e^{i\theta} [\Delta u + |u|^\alpha u] + \gamma u}$$ u t = e i θ [ Δ u + | u | α u ] + γ u on $${\mathbb{R}^N}$$ R N , where $${\alpha > 0,\,\gamma \in \mathbb{R}}$$ α > 0 , γ ∈ R and $${-\pi /2 < \theta < \pi /2}$$ - π / 2 < θ < π / 2 . By convexi... | Finite-time blowup for a complex Ginzburg–Landau equation with linear driving | 10.1007/s00028-014-0220-z |
2014-06-01 | Based on known theoretical developments in linear dynamics of homogeneous beams, two homogenization approaches of composite beams are developed further to an anterior work using two equivalent properties: the physical and the mechanic–geometrical properties. Further to the assumption of Euler–Bernoulli beams, dynamic ... | Simplified Method Using Homogenization Approach for Nonlinear Dynamic Analysis of Dissipative Energy in Multilayered Beams | 10.1007/s13369-014-1036-4 |
2014-06-01 | In this paper, soft tissue is modeled by a mass–spring–damper system and tissue deformations under the compression of surgical instruments are simulated. For this purpose, soft tissue confined in a cubic plastic mold is studied using a nonlinear viscoelastic model. Displacements resulting from probe insertions are meas... | A new fast nonlinear modeling of soft tissue for surgical simulation | 10.1007/s11701-013-0444-x |
2014-06-01 | The influence of the gravitational radiation damping on the evolution of the orbital elements of compact binary stars is examined by using the method of perturbation. The perturbation equations with the true anomaly as an independent variable are given. This effect results in both the secular and periodic variation of ... | Gravitational Radiation Damping and Evolution of the Orbit of Compact Binary Stars (Solution by the Second Perturbation Method) | 10.1007/s12036-014-9275-z |
2014-06-01 | The paper presents the results of in-situ and laboratory tests aimed at defining the cyclic properties of soils and soft rocks of the Central Archeological Area of Rome in the framework of the seismic microzonation study of the area. The small-strain shear modulus $$\text{ G }_{0}$$ (or analogously shear wave velocity ... | Dynamic characterization of soils and soft rocks of the Central Archeological Area of Rome | 10.1007/s10518-013-9452-5 |
2014-06-01 | In this study, energy absorption capacity, flexural and dynamic properties of flax fibre reinforced epoxy polymer composite (FFRP) tubes are investigated. The energy absorption capacity of the tubes is investigated under uniaxial compression. Flexural behaviour of the tubes is studied under four-point bending and the d... | On energy absorption capacity, flexural and dynamic properties of flax/epoxy composite tubes | 10.1007/s12221-014-1270-0 |
2014-06-01 | This paper presents the ground motion amplification scenario along with fundamental frequency ( F _0) of sedimentary deposit for the seismic microzonation of Kolkata City, situated on the world’s largest delta island with very soft soil deposit. A 4th order accurate SH -wave viscoelastic finite-difference algorithm is ... | Computation of ground motion amplification in Kolkata megacity (India) using finite-difference method for seismic microzonation | 10.2478/s11600-013-0169-2 |
2014-06-01 | Plan asymmetric buildings are very susceptible to earthquake induced damage due to lateral torsional coupling, and the corners of these systems suffer heavy damage during earthquakes. Therefore, it is important to investigate the seismic behavior of an asymmetric plan building with MR dampers. In this study, the effect... | Earthquake response of asymmetric building with MR damper | 10.1007/s11803-014-0232-2 |
2014-06-01 | This paper presents exact analytical solutions for a novel damped outrigger system, in which viscous dampers are vertically installed between perimeter columns and the core of a high-rise building. An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring ac... | Dynamic characteristics of a novel damped outrigger system | 10.1007/s11803-014-0231-3 |
2014-05-23 | Damping is a critical design parameter for miniaturized mechanical resonators used in microelectromechanical systems (MEMS), nanoelectromechanical systems (NEMS), optomechanical systems, and atomic force microscopy for a large and diverse set of applications ranging from sensing, timing, and signal processing to precis... | Design strategies for controlling damping in micromechanical and nanomechanical resonators | 10.1140/epjti5 |
2014-05-09 | In this paper, we consider a class of non-periodic damped vibration problems with superquadratic nonlinearities. We study the existence of nontrivial ground state homoclinic orbits for this class of damped vibration problems under some conditions weaker than those previously assumed. To the best of our knowledge, there... | Ground state homoclinic orbits of damped vibration problems | 10.1186/1687-2770-2014-106 |
2014-05-01 | The friction behavior of steel/steel contacts lubricated with glycerol, 150NS and PAO4 is investigated using a new technique. Then, three additives are used in PAO4 lubricant: oleic, linoleic and stearic acids. The experiments are performed at different temperatures. Moreover, nearly all the systems operate in either t... | Effect of Temperature on Lubricated Steel/Steel Systems With or Without Fatty Acids Additives Using an Oscillating Dynamic Tribometer | 10.1007/s11249-014-0323-2 |
2014-05-01 | This paper presents a numerical method based on a three dimensional boundary element–finite element (BEM–FEM) coupled formulation in the time domain. The proposed model allows studying soil–structure interaction problems. The soil is modelled with the BEM, where the radiation condition is implicitly satisfied in the fu... | A 3D time domain numerical model based on half-space Green’s function for soil–structure interaction analysis | 10.1007/s00466-013-0949-1 |
2014-05-01 | Knowledge of critical points is important to determine the phase behavior of a mixture. This work proposes a reliable and accurate method in order to locate the liquid–vapor critical point of a given mixture. The theoretical model is developed from the rigorous definition of critical points, based on the SRK equation o... | An Improved Computational Method for the Calculation of Mixture Liquid–Vapor Critical Points | 10.1007/s10765-014-1680-7 |
2014-05-01 | This paper is aimed to extend a certain damped technique, suitable for the Broyden–Fletcher–Goldfarb–Shanno (BFGS) method, to the limited memory BFGS method in the case of the large-scale unconstrained optimization. It is shown that the proposed technique maintains the global convergence property on uniformly convex fu... | Damped Techniques for the Limited Memory BFGS Method for Large-Scale Optimization | 10.1007/s10957-013-0448-8 |
2014-05-01 | Diurnal wind (DW) and nonlinear interaction between inertial and tidal currents near the Xisha Islands of the South China Sea (SCS) during the passage of Typhoon Conson (2010) are investigated using observational data and a damped slab model. It is found that the DWs, which are dominated by clockwise wind components, a... | Diurnal wind and nonlinear interaction between inertial and tidal currents in the South China Sea during the passage of Typhoon Conson | 10.1007/s13131-014-0467-9 |
2014-05-01 | Histones are DNA-binding proteins and are involved in chromatin remodeling and regulation of gene expression. Histones can be released after tissue injuries, and the extracellular histones cause cellular damage and organ dysfunction. Regardless of their clinical significance, the role and relevance of histones in ocula... | Toxic effects of extracellular histones and their neutralization by vitreous in retinal detachment | 10.1038/labinvest.2014.46 |
2014-04-29 | It is well known that the vibration of washing machines is a challenging issue to be considered. This research work focuses on the optimal design of a flow-mode magneto-rheological (MR) damper that can replace the conventional passive damper for a washing machine. Firstly, rigid mode vibration of the washing machine du... | Optimal design and performance evaluation of a flow-mode MR damper for front-loaded washing machines | 10.1186/2196-1166-1-3 |
2014-04-23 | Background Sterile inflammation occurs in the absence of live pathogens and is an unavoidable consequence of ischemia-reperfusion (IR) injury in the central nervous system (CNS). It is known that toll-like receptor 4 (Tlr4) contributes to damage and sterile inflammation in the CNS mediated by IR. However, the mechanism... | Putative role of protein kinase C in neurotoxic inflammation mediated by extracellular heat shock protein 70 after ischemia-reperfusion | 10.1186/1742-2094-11-81 |
2014-04-01 | The goal of this paper is to investigate the finite time blow-up of solutions with supercritical boundary/interior sources and nonlinear boundary/interior damping. First, we prove that if the interior and boundary sources dominate their corresponding damping terms, then every weak solution blows up in finite time with ... | Blow-up of Positive Initial Energy Solutions for A System of Nonlinear Wave Equations with Supercritical Sources | 10.1007/s10883-014-9210-2 |
2014-04-01 | The shape memory alloys present unusual thermo-mechanical properties. The most important of them are pseudo-elasticity and memory effect. The paper investigates this behaviour for the Ni-Ti wires under static (v < 50 mm/s) and dynamic conditions (v > 50 mm/s) at different temperatures. Ni-Ti actuator and pseudoelastic ... | Future applications of Ni-Ti alloys in automotive safety systems | 10.1007/s12239-014-0049-z |
2014-04-01 | The focus of this paper is on studying an inverse second-order cone quadratic programming problem, in which the parameters in the objective function need to be adjusted as little as possible so that a known feasible solution becomes the optimal one. We formulate this problem as a minimization problem with cone constrai... | The augmented Lagrangian method for a type of inverse quadratic programming problems over second-order cones | 10.1007/s11750-011-0227-3 |
2014-04-01 | Non-linear tidal dynamics are investigated in a network that consists of a semi-enclosed main channel and a secondary channel at an arbitrary position. The water motion, governed by the one-dimensional shallow water equations, is forced by an incoming tidal wave. Solutions are obtained with the method of characteristic... | Effect of a secondary channel on the non-linear tidal dynamics in a semi-enclosed channel: a simple model | 10.1007/s10236-014-0690-0 |
2014-04-01 | This paper proposes an optimization procedure based on eigenvalues to carry out the stabilization function of the Gate-Controlled Series Capacitor (GCSC) in a power system. It is aimed to provide a reliable damping framework by means of a GCSC based multi-objective damping controller. The proposed method employs Partic... | Design of multi-objective damping controller for gate-controlled series capacitor | 10.1007/s12046-013-0213-6 |
2014-04-01 | Conventional steel-based rubber bearings are being replaced by fiber reinforced elastomeric isolators (FREI) due to their high weight and manufacturing cost. Compared to existing rubber bearings, FREIs have superior performance and as a result can control the seismic response of structures more efficiently. This study ... | Sensitivity analysis of carbon fiber-reinforced elastomeric isolators based on experimental tests and finite element simulations | 10.1007/s10518-013-9556-y |
2014-04-01 | In superfluid ^3He-B externally pumped quantized spin-wave excitations or magnons spontaneously form a Bose-Einstein condensate in a 3-dimensional trap created with the order-parameter texture and a shallow minimum in the polarizing field. The condensation is manifested by coherent precession of the magnetization with ... | Relaxation of Bose-Einstein Condensates of Magnons in Magneto-Textural Traps in Superfluid ^3He-B | 10.1007/s10909-013-0946-y |
2014-04-01 | Vibrations on gears are mainly induced by the gear mesh contact. Resonance conditions of the gear may occur during service if the mesh frequency is close to the natural frequencies of the system at the designed speed of the shaft. Since detuning is not always possible in gears, the response level must be reduced by inc... | Passive control of vibration of thin-walled gears: advanced modelling of ring dampers | 10.1007/s11071-013-1125-z |
2014-04-01 | The aim of this study is to develop a general model for beams and rods with fractional derivatives. Fractional time derivatives can represent the damping term in dynamical models of continuous systems. Linear differential operators with spatial derivatives make it possible to generalize a wide range of problems. The me... | Linear dynamical analysis of fractionally damped beams and rods | 10.1007/s10665-013-9642-9 |
2014-04-01 | In this paper, we show how to obtain decay estimates for the damped wave equation on a compact manifold without geometric control via knowledge of the dynamics near the undamped set. We show that if replacing the damping term with a higher-order complex absorbing potential gives an operator enjoying polynomial resolven... | From resolvent estimates to damped waves | 10.1007/s11854-014-0006-9 |
2014-04-01 | We focus on growth of solutions of the problem Under condition p > max ( m − 1, k + 1, l + 1, ϑ + 1, ϱ + 1), with positive initial energy, we will prove that the solutions of (1) satisfies $\lim _{t \to \infty } \sum\nolimits_{i = 1}^2 {\left\| {u_i } \right\|_{p + 1} \to \infty } $ . | Growth of solutions with positive initial energy to system of degeneratly damped wave equations with memory | 10.1134/S1995080214020139 |
2014-04-01 | This paper deals with the Cauchy problem of a nonlinear wave equation with damping and source terms. By the exact Gagliardo–Nirenberg inequality connected with the classic nonlinear elliptic equation, we establish new invariant sets of the problem. Then we get the exact conditions of blow-up and global existence. | Exact conditions of blow-up and global existence for the nonlinear wave equation with damping and source terms | 10.1007/s11071-013-1116-0 |
2014-04-01 | This paper deals with the studies for determining the degree of seismic hazard of grounds by taking into account all possible most important factors that influence their seismic hazard degree. The procedure, which is developed by the author on the basis of new approaches to solve this problem multilaterally, is present... | New procedure for assessing the seismic hazard and behavior of soft and stiff grounds caused by the multifactor seismic effect | 10.3103/S0747923914020030 |
2014-04-01 | Study of intermediate mass fragments (IMFs) and light charged particles (LCPs) emission has been carried out for a few reactions involving α -cluster and non- α -cluster systems to see how the emission processes are affected by nuclear clustering. Li, Be, B and α -particles have been studied from α -clustered system ^1... | The effect of nuclear structure in the emission of reaction products in heavy-ion reactions | 10.1007/s12043-014-0724-7 |
2014-04-01 | In this paper, a class of damped vibration problems with impulsive effects is considered. An existence result is obtained by using the variational method and the critical point theorem due to Brezis and Nirenberg. The obtained result is also valid and new for the corresponding second-order impulsive Hamiltonian system.... | Existence of nonzero solutions for a class of damped vibration problems with impulsive effects | 10.1007/s10492-014-0046-6 |
2014-04-01 | The basic purpose of a damper is to reduce the vibration and to have a better ride comfort, road handling and safety to the rider. Recent developments show that an active vibration damper can effectively work much better than a passive damper. The effectiveness and reliability can be further enhanced by using hybrid da... | A Study on Design and Analysis of Hybrid Vibration Damper with Energy Harvesting and Optimal Damping Effect | 10.1007/s40032-014-0115-3 |
2014-04-01 | Structural damping is an important parameter in system identification and assessment of structural systems. Due to its variable nature, especially in highway bridges, precise estimation of damping poses challenges both from the computational point of views as well as complexity of operations. Survey of technical litera... | Field tests and verification of damping calculation methods for operating highway bridges | 10.1007/s13349-013-0067-y |
2014-04-01 | This paper is focused on the study of an earthquake protection system, the tuned liquid damper (TLD), which can, if adequately designed, reduce earthquake demands on buildings. This positive effect is accomplished taking into account the oscillation of the free surface of a fluid inside a tank (sloshing). The behaviour... | Tuned liquid dampers simulation for earthquake response control of buildings | 10.1007/s10518-013-9528-2 |
2014-04-01 | This paper deals with the damped superlinear oscillator $$x'' + a(t)\phi_p\bigl(x' \bigr) + b(t)\phi_q\bigl(x'\bigr)+ \omega^2x = 0, $$ where a ( t ) and b ( t ) are continuous and nonnegative for t ≥0; p and q are real numbers greater than or equal to 2; ϕ _ r ( x ′)=| x ′|^ r −2 x ′. This equation is a generalization... | Global Dynamics of Froude-Type Oscillators with Superlinear Damping Terms | 10.1007/s10440-013-9839-y |
2014-04-01 | This paper presents a simple method to control the motion of a quadruped robot in unknown rough terrain using a full dynamic model. First, using the stiffness control method, the behavior of the four legs is approximated using four 3D spring damper systems. In this way, the dynamic model can be derived in Cartesian spa... | Motion control of a quadruped robot in unknown rough terrain using 3D spring damper leg model | 10.1007/s12555-013-0053-5 |
2014-03-01 | We consider the Cauchy problem in R ^ n for the system of elastic waves with structural damping. We derive (almost) optimal decay rates in time for the L ^2-norm and the total energy which improves previous results for this system. To derive the estimates for elastic waves, we employ an improvement in a method in the F... | Optimal decay rates for the system of elastic waves in R
^
n
with structural damping | 10.1007/s00028-014-0216-8 |
2014-03-01 | Seismic Damage Avoidance Design (DAD) principle that incorporates rocking wall with armoured steel wall to foundation seat details are presented for a class of warehouse type building. The walls consist of a mix of seismic wall panels and non-seismic infill cladding panels. The seismic wall panels are used to seat the ... | Damage avoidance design for buildings | 10.1007/s12205-014-0016-2 |
2014-03-01 | Certain exact solutions to the linear differential-difference heat and mass transfer equations with a finite relaxation time are specified. The exact solution to the one-dimensional Stokes problem with the periodic boundary condition when a first-order volume chemical reaction occurs is given. A wide class of exact sol... | Exact solutions to differential-difference heat and mass transfer equations with a finite relaxation time | 10.1134/S0040579514020110 |
2014-03-01 | Based on a three-component description of partially ionized plasmas (i.e., electrons, ions, and neutral atoms), effects of inelastic collisions between ions (neutrals) and electrons on Alfvén waves (AWs) in a partially ionized plasma are studied. It is shown that for a fixed ionizability ( $$\epsilon_i$$ ϵ i ) or a fix... | Effects of inelastic collisions on Alfvén waves in partially ionized plasmas | 10.1007/s11434-013-0021-8 |
2014-03-01 | In this paper we consider the propagation of Rayleigh surface waves in an exponentially graded half-space made of an isotropic Kelvin-Voigt viscoelastic material. Here we take into account the effect of the viscoelastic dissipation energy upon the corresponding wave solutions. As a consequence we introduce the damped i... | Rayleigh Surface Waves on a Kelvin-Voigt Viscoelastic Half-Space | 10.1007/s10659-013-9447-0 |
2014-03-01 | The chain/wire rope/chain combination is a common choice for mooring offshore floating platforms. However, data of the drag coefficients of chain links are rather limited, resulting in uncertainties with the calculations of the drag force, and hence the damping of the mooring system. In this paper, the importance of th... | Numerical investigation of mooring line damping and the drag coefficients of studless chain links | 10.1007/s11804-014-1235-0 |
2014-03-01 | In this study, a novel rotational damper called a Rotational Friction Viscoelastic Damper (RFVD) is introduced. Some viscoelastic pads are added to the Rotational Friction Damper (RFD) in addition to the friction discs used in this conventional device. Consequently, the amount of energy dissipated by the damper increas... | Performance evaluation of a novel rotational damper for structural reinforcement steel frames subjected to lateral excitations | 10.1007/s11803-014-0213-5 |
2014-03-01 | Surface wave methods are becoming increasingly popular in many geotechnical applications and in earthquake seismology due to their noninvasive characteristics. Inverse surface wave dispersion curves are a crucial step in most surface wave methods. Many inversion methods have been applied to surface wave dispersion curv... | A hybrid inversion method of damped least squares with simulated annealing used for Rayleigh wave dispersion curve inversion | 10.1007/s11803-014-0208-2 |
2014-03-01 | This paper constitutes the second part of the article Kinematically excited parametric vibration of a tall building model with a TMD. Part 1: numerical analyses (ACME, in press) by K. Majcher and Z. Wójcicki, which presents the results of theoretical research. This paper presents the experi¬mental verification of those... | Kinematically excited parametric vibration of a tall building model with a TMD—Part 2: Experimental analyses | 10.1016/j.acme.2013.09.003 |
2014-02-14 | In this paper we are interested in studying the effect of the fractional-order damping in the forced Duffing oscillator before and after applying a discretization process to it. Fixed points and their stability are discussed for the discrete system obtained. Finally, numerical simulations using Matlab are carried out t... | Discretization of forced Duffing system with fractional-order damping | 10.1186/1687-1847-2014-66 |
2014-02-01 | Let $\mathcal{M}\subset\mathbb{R}^{3}$ be an oriented compact surface on which we consider the system: $$\left \{ \begin{array}{l@{\quad}l} u_{tt} - \Delta_{\mathcal{M}} u + a(x)g_{0}(u_{t})=0 & \text{in } \mathcal{M}\times\mathopen{]} 0,\infty[ ,\\ \partial_{\nu_{co}}u +u + b(x)g(u_t)=0 & \text{on } \partial \mathcal ... | Unified Approach to Stabilization of Waves on Compact Surfaces by Simultaneous Interior and Boundary Feedbacks of Unrestricted Growth | 10.1007/s00245-013-9218-0 |
2014-02-01 | This paper investigates how changes in chatter amplitude and frequency depend on process damping effect in dynamic turning process. For this purpose, the two degrees of freedom (TDOF) cutting system was modeled, and for an orthogonal turning system, the process damping model with a new simple approach was developed. To... | A simple approach to analyze process damping in chatter vibration | 10.1007/s00170-013-5307-0 |
2014-02-01 | Two different methods to model a point absorber wave energy converter (WEC) with direct drive linear power take-off (PTO) are proposed in the present study: the frequency domain (FD) method and the time domain (TD) method. In the FD analysis, the frequency response function (FRF) of the WEC device is obtained via the e... | Frequency/time domain modeling of a direct drive point absorber wave energy converter | 10.1007/s11433-013-5200-8 |
2014-02-01 | In this paper, we study the initial-boundary value problem for a coupled system of nonlinear viscoelastic wave equations of Kirchhoff type with Balakrishnan–Taylor damping terms. For certain class of relaxation functions and certain initial data, we prove that the decay rate of the solution energy is similar to that of... | On a system of nonlinear wave equations with Balakrishnan–Taylor damping | 10.1007/s00033-013-0324-2 |
2014-02-01 | Revolute joints in applications always show clearance between pin and bushing due to manufacturing tolerances, the need of relative motion or progressing wear. Many researchers developed and investigated methodologies to calculate the dynamic behavior of mechanisms with such imperfect joints. Very often they use a simp... | Modeling planar slider-crank mechanisms with clearance joints in RecurDyn | 10.1007/s11044-012-9339-2 |
2014-02-01 | In a companion article Akkar et al. (Bull Earthq Eng, doi: 10.1007/s10518-013-9461-4 , 2013a ; Bull Earthq Eng, doi: 10.1007/s10518-013-9508-6 , 2013b ) present a new ground-motion prediction equation (GMPE) for estimating 5 %-damped horizontal pseudo-acceleration spectral (PSA) ordinates for shallow active crustal reg... | Compatible ground-motion prediction equations for damping scaling factors and vertical-to-horizontal spectral amplitude ratios for the broader Europe region | 10.1007/s10518-013-9537-1 |
2014-02-01 | In a rotor bearing system operating with constant angular acceleration, after passing through the critical speed, typical beat characteristics are observed because the transverse vibration response contains both excited and natural motion, and shortly after passing resonance, vibrations with close frequencies appear. T... | Damping identification in rotors from run-up beat responses using Hilbert transforms | 10.1007/s12206-013-1106-7 |
2014-02-01 | An analytical model is developed to estimate the two-phase damping ratio for upward cross-flow through horizontal tube bundles. The present model is formulated based on Feenstra’s model (2000) for void fraction and various models (homogeneous, Levy, Martinelli-Nelson and Marchaterre) for two-phase friction multiplier. ... | A two-phase damping model on tube bundles subjected to two-phase cross-flow | 10.1007/s12206-013-1122-7 |
2014-02-01 | A new tamping device which is driven by an electrohydraulic exciter was proposed to overcome the limitations of mechanically driven devices. The double-rod oscillation cylinder drives the tamping arm to realize vibration. A new spin valve was designed in order to fulfill dynamic state requirements of the oscillation cy... | Mechanism of electro-hydraulic exciter for new tamping device | 10.1007/s11771-014-1969-5 |
2014-02-01 | Many engineering structures are required to minimize vibrations. Vibrations in a system can be reduced by changing the design of the structure or by using a new material which has better mechanical damping. Damping materials are desirable as they convert mechanical energy to heat. As most engineering structures are loa... | Improvement of viscoelastic damping by using manganese bronze with indium | 10.1007/s11043-013-9223-3 |
2014-02-01 | Machining dynamic stability has been enhanced through a damping coating based on a novel carbon-based nanocomposite material. The coating was synthesized using a plasma enhanced chemical vapor deposition method, and deposited on to the round-shank boring bar used for internal turning and tested during machining. Compar... | Anti-vibration Engineering in Internal Turning Using a Carbon Nanocomposite Damping Coating Produced by PECVD Process | 10.1007/s11665-013-0781-y |
2014-02-01 | Dynamic thermomechanical analysis (DTMA) of unfilled as well as particle-filled poly(dimethylsiloxane) and poly(norbornene) was performed to compare their behavior as dampers. PDMS and PNB were filled with varying contents of spherical iron particles (aspect ratio of 1) and also different hardness formulations of the m... | Applicability of elastomer time-dependent behavior in dynamic mechanical damping systems | 10.1007/s11043-013-9219-z |
2014-01-01 | Damping forces are typically ignored during the Finite Element Analysis (FEA) of mechanical structures. In most real structures, it can be assumed that there are several damping mechanisms at work, but they may be difficult to identify, and even more difficult to model. Since both mass & stiffness matrices are availabl... | Proportional Damping from Experimental Data | 10.1007/978-1-4614-6585-0_17 |
2014-01-01 | The traditional measurement techniques to acquire the linear dynamic response of a single component are well established and have been in use for many decades to provide reliable input data for model updating. The measurement of assembled structures normally follows a very similar approach, although the presence of joi... | Test Method Development for Nonlinear Damping Extraction of Dovetail Joints | 10.1007/978-3-319-04501-6_21 |
2014-01-01 | First, this article analyzes the basic principles of supplementary subsynchronous damping controller (SSDC) inhibiting SSO caused by the DC control system. Second, based on the principle of phase compensation, a multi-mode SSDC is designed in accordance with the maximum phase compensation method. Third, test signal met... | Design of Direct Current Subsynchronous Damping Controller (SSDC) | 10.1007/978-3-319-01273-5_76 |
2014-01-01 | This chapter aims at presenting basic ideas and main insights of the energy-based control approach for power electronic converters. Thus, two control methods based on concepts of energy will be here detailed: the so-called stabilizing control – based upon Lyapunov control design methods – and passivity-based control , ... | Energy-Based Control of Power Electronic Converters | 10.1007/978-1-4471-5478-5_12 |
2014-01-01 | In this paper we consider the critical exponent problem for the semilinear damped wave equation with time-dependent coefficients. We treat the scale invariant cases. In this case the asymptotic behavior of the solution is very delicate and the size of coefficient plays an essential role. We shall prove that if the powe... | Critical Exponent for the Semilinear Wave Equation with Scale Invariant Damping | 10.1007/978-3-319-02550-6_19 |
2014-01-01 | The dynamic model of a vehicle seat with magnetorheological damper is established in this paper, which is established with the finite element analysis software. On the basis of single degree of freedom spring-damping system, the established model simulates the working characteristic of the magnetorheological damper. Ba... | Research on the Dynamic Model with Magnetorheological Damper | 10.1007/978-3-642-54236-7_36 |
2014-01-01 | Structures with mechanical joints are difficult to accurately model; even when the natural frequencies of the system remain essentially constant, the damping introduced by the joints is often observed to depend nonlinearly on amplitude. Although models for individual joints have been employed with some success, the mod... | Investigation of Modal Iwan Models for Structures with Bolted Joints | 10.1007/978-1-4614-6540-9_2 |
2014-01-01 | We study the asymptotic behaviour of the wave equation with viscoelastic damping in presence of a time-delayed damping. We prove exponential stability if the amplitude of the time delay term is small enough. | Exponential Stability of the Wave Equation with Memory and Time Delay | 10.1007/978-3-319-11406-4_1 |
2014-01-01 | This chapter addresses the most important issues on the virtual synchronous generator (VSG) concept with the relevant past achievements. The most important VSG design frameworks and topologies are described. An overview of the key issues in the integration of VSGs in the MGs and power grids, and their application areas... | Virtual Inertia-Based Frequency Control | 10.1007/978-3-319-07278-4_12 |
2014-01-01 | The most employed and useful model of a vehicle suspension system is a quarter car model, shown in Figure 15.1. We introduce, examine, and optimize the quarter car model in this chapter. | ⋆ Quarter Car Model | 10.1007/978-1-4614-8544-5_15 |
2014-01-01 | In this work, an efficient FE-modeling technique for assembled metallic structures is presented. Linear thin-layer elements containing damping and stiffness parameters are placed on the interfaces of bolted joints. The interface parameters are identified experimentally on an isolated lap joint and then used as an input... | Microslip Joint Damping Prediction Using Thin-Layer Elements | 10.1007/978-3-319-04501-6_22 |
2014-01-01 | The paper at hand shows how structural damping and stiffness parameters in shrunk joints can be determined by a generic joint experiment. With thin-layer elements these parameters from the joint experiment are coupled to the structures finite element model. Equivalent modal damping factors can be determined by performi... | Experimental Identification and Simulation of Rotor Damping | 10.1007/978-3-319-04501-6_19 |
2014-01-01 | In simple terms, noise is unwanted sound. Noise can disturb human’s work, rest, sleep and communication, and it can damage hearing. Indeed, the most important issue is industrial noise problem and a need for noise control and hearing conservation programs. This chapter provides guidelines comprising: (a) Brief explanat... | Noise Pollution Control | 10.1007/978-3-319-01234-6_4 |
2014-01-01 | In this chapter, the response characteristics for material, hysteretic, and friction damping mechanisms are examined for a single-degree-of-freedom (SDOF) system. The concept of equivalent viscous damping is introduced and is used to express viscoelastic, structural, and hysteretic damping in terms of their equivalent ... | Optimal Passive Damping Distribution | 10.1007/978-3-319-06281-5_4 |
2014-01-01 | Human interaction with structural systems is not totally understood, leading to either overdesign or extreme vibrations. Different numerical models have been proposed to represent this interaction. Most of these models use masses, springs and dampers to model the human. One could argue that the interaction between stru... | Modeling Human–Structure Interaction Using a Close Loop Control System | 10.1007/978-3-319-04546-7_12 |
2014-01-01 | Characterizing frictional behavior of viscoelastic joints is investigated in the present work. A new visco-tribological model was developed by coupling the rheological Generalized Maxwell model (GMM) and Dahl friction model. Parameters of the proposed model are identified from Dynamic Mechanical Analysis (DMA) tests fo... | Dynamic Characterization of Viscoelastic Components | 10.1007/978-3-319-07170-1_15 |
2014-01-01 | The mechanical response of a viscoelastic material to external loads combines the characteristics of elastic and viscous behavior. On the other hand, as we know from experience, springs and dashpots are mechanical devices which exhibit purely elastic and purely viscous response, respectively. It is then natural to imag... | Constitutive Equations in Differential Operator Form | 10.1007/978-1-4614-8139-3_3 |
2014-01-01 | With the rapid development of femtosecond laser and micro/nano processing techniques, researchers face great challenges in thermal management and analysis under the extreme conditions. As the theoretical basis of heat transfer, Fourier’s law may break down at femtosecond temporal scales and nanometer spatial scales. In... | Thermomass Theory for Non-Fourier Heat Conduction | 10.1007/978-3-642-53977-0_2 |
2014-01-01 | This chapter analyzes the two most popular classes of transducers used in active vibration control: the electromagnetic transducer known as voice coil , and the piezoelectric transducer. The first part of the chapter discusses the theory of the transducers and the second part discusses some applications in structural c... | Electromagnetic and Piezoelectric Transducers | 10.1007/978-3-7091-1821-4_4 |
2014-01-01 | This chapter deals with the theory of viscoelasticity and the discrete models such as, for example, the Kelvin and Maxwell models. The aim of this chapter is to assess the dynamic behavior of viscoelastic dissipative bracing systems taking into account the presence of the brace. In fact, the viscoelastic damper is mode... | Modeling of Viscoelastic Dissipative Bracing Systems | 10.1007/978-3-319-02615-2_4 |
2014-01-01 | The United States Eastern Interconnection (EI) has been going through some profound changes due to the increasing penetration of wind power in this bulk grid, including the worsening of the frequency response and inter-area oscillation. However, the fast response speed of electronics devices makes it possible that the ... | Contribution of Variable-Speed Wind Generators to Frequency Regulation and Oscillation Damping in the United States Eastern Interconnection | 10.1007/978-981-4585-27-9_8 |
2014-01-01 | By subsuming experimental modal and radiation analysis results on many violins, boundary element method computations for a violin undergoing soundpost removal, nearfield acoustical holography for port ( f -holes) radiation, and statistical energy analysis into a generalized structural acoustics framework it is possible... | EMA-BEM-NAH-SEA Path to a Dynamic Filter Model for Violin Radiativity | 10.1007/978-3-319-04753-9_32 |
2014-01-01 | This paper derives exact results for the maximum achievable accuracy when estimating modal parameters from free vibration and forced vibration signals contaminated by Gaussian white noise. These limits are found through the Cramer-Rao lower bound. The paper proposes a simple yet accurate expression to determine the rat... | Uncertainty Quantification of Identified Modal Parameters Using the Fisher Information Criterion | 10.1007/978-3-319-04552-8_17 |
2014-01-01 | The aim of this paper is to understand the influence of the interplay between a time-dependent increasing speed of propagation and a timedependent coefficient in the dissipation on qualitative properties of solutions to the wave model $$u_{tt}-a^2(t)\bigtriangleup\mathrm{u}+ b(t)u_t=0,\,u(0,x)=u_1(x),u_{t}(0,x)=u_{2}(x... | The Interplay Between Time-dependent Speed of Propagation and Dissipation in Wave Models | 10.1007/978-3-319-02550-6_2 |
2014-01-01 | This chapter is concerned by tuned-mass damping systems. We start with an introductory example of a tuned-mass damper (TMD) design and a brief description of some of the implementations of TMDs in building structures. A rigorous theory of TMDs for single-degree-of-freedom (SDOF) systems subjected to harmonic force exci... | Tuned Mass Damper Systems | 10.1007/978-3-319-06281-5_5 |
2014-01-01 | The pendulum chain with torsional spring coupling represents a physical system that is described exactly by the spatially discrete sG equation. In order to study its solutions experimentally, however, we have to drive the system to counteract the inevitable dissipation we face in experiments. In fact, it is important t... | Experimental Results for the sine-Gordon Equation in Arrays of Coupled Torsion Pendula | 10.1007/978-3-319-06722-3_5 |
2014-01-01 | This chapter discusses base-isolation systems. A set of simple examples are presented to identify the key parameters and illustrate the quantitative aspects of base isolation. This material is followed by a discussion of practical aspects of seismic base isolation and a description of some seismically isolated building... | Base Isolation Systems | 10.1007/978-3-319-06281-5_6 |
2014-01-01 | A finite element model calibration procedure that uses frequency response function data and relies on damping equalization is presented. In this, the dampings of the finite element model and the corresponding experimental model are set equal before calibration. The damping equalization is made to avoid the mode pairing... | FEM Calibration with FRF Damping Equalization | 10.1007/978-3-319-04552-8_26 |
2014-01-01 | This study presents an operational modal analysis of rotating Carbon Nanotube (CNT) infused composite beams in order to explore the effect of CNT’s on the natural frequencies and damping characteristics of the composite structure during rotation. Engineering applications with rotating components made from composites of... | Modal Analysis of Rotating Carbon Nanotube Infused Composite Beams | 10.1007/978-1-4614-6585-0_52 |
2014-01-01 | The scope of this paper is to investigate the damping performance of metal swarfs in hollow structures and to compare its vibration suppression performance with existing granular damping technologies. The effectiveness in suppressing vibrations in a hollow aluminum beam using aluminum, mild steel and stainless steel sw... | Damping performance of metal swarfs in a horizontal hollow structure | 10.1007/s12206-013-0980-3 |
2014-01-01 | A base isolated three storey 3-D building is semi-actively controlled not to exceed the maximum allowable base displacement. Large displacements are likely to cause failure in the isolation system, and hence, failure in the superstructure is expected. If a base isolated structure is positioned next to a very long fault... | Hybrid Control of a 3-D Structure by Using Semi-Active Dampers | 10.1007/978-3-319-00458-7_18 |
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