publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2015-12-01 | Thermoelastic damping (TED) is a fundamental dissipation mechanism in micro/nano-scale resonators. Therefore, it is crucial to minimize this dissipation in design of these resonators. The problem has been formulated by the nonlocal theory of elasticity to take into account the small scale effect. Moreover, the Timoshen... | Analysis of bias DC voltage effect on thermoelastic damping ratio in short nano-beam resonators based on nonlocal elasticity theory and dual-phase-lagging heat conduction model | 10.1007/s11012-015-0171-7 |
2015-12-01 | Visco-elastic material models with fractional characteristics have been used for several decades. This paper provides a simple methodology for Finite-Element-based dynamic analysis of structural systems with viscosity characterized by fractional derivatives of the strains. In particular, a re-formulation of the well-kn... | Dynamic Finite Element analysis of fractionally damped structural systems in the time domain | 10.1007/s00707-015-1454-8 |
2015-12-01 | The two critical issues of robust control are stable controller synthesis and control performance guarantee in the presence of model uncertainties. Inside all robust stable solutions, small modeling parametric uncertainties lead to better performance controllers. However, the cost to develop an accurate hydrodynamic mo... | Modeling of a Complex-Shaped Underwater Vehicle for Robust Control Scheme | 10.1007/s10846-015-0186-2 |
2015-12-01 | We consider the vibrations of a cantilever structure modeled by the standard linear flexible model of viscoelasticity coupled to an expectedly dissipative effect through heat conduction. It is shown that the amplitude of such vibrations is bounded under some restriction of the disturbing force. Using multiplier techniq... | Stability of the vibrations of an inhomogeneous flexible structure with thermal effect | 10.1007/s40435-014-0113-6 |
2015-12-01 | In the early Universe up to hydrogen recombination in the Universe, the radiation pressure was much greater than the pressure of baryons and electrons. Moreover, the energy density of cosmic microwave background (CMB) photons was greater than or close to the energy density contained in the rest mass of baryonic matter,... | Energy density of standing sound waves at the radiation-dominated phase of the universe expansion (hydrodynamic derivation) | 10.1134/S106377371512004X |
2015-12-01 | An experimental study is conducted on fully grouted reinforced masonry shear walls (RMSWs) made from concrete blocks with a new configuration. Ten RMSWs are tested under reversed cyclic lateral load to investigate the influence of different reinforcements and applied axial stress values on their seismic behavior. The r... | Experimental studies on behavior of fully grouted reinforced-concrete masonry shear walls | 10.1007/s11803-015-0030-5 |
2015-12-01 | 目 的 基于三维线性势流理论, 通过在近距两浮体间的自由液面上引入“粘性耗散系数”, 建立计及粘性影响的波浪中近距两浮体水动力干扰效应分析数值计算方法, 以准确分析两浮体的干扰力及浮体间液面升高;并探讨“粘性耗散系数”的确定方法、两浮体间流体共振频率及共振模式的数值计算方法。 方 法 1. 通过理论分析, 在三维线性势流理论基础上, 引入流体“粘性耗散”(公式2、10∼12、18和19)以准确模拟近距两浮体波浪中的水动力及浮体间液面抬升;2. 采用雷诺应力平均方程(RANSE)方法或试验方法确定“粘性耗散系数”(图2 和3);3. 采用数值计算和理论分析的方法给出近距两浮体间的流体共振模式(图8)及共振频率估算方法(公式21∼ 25... | Modeling of fluid resonance in-between two floating structures in close proximity | 10.1631/jzus.A1500017 |
2015-12-01 | In this work, we address experimentally the determination of the dynamical properties, in particular natural frequencies and damping factors, of laminated structural glass. Various specimens, coming from different productions and manufactures, are investigated. Damped free vibrations experiments are performed, where th... | On the experimental determination of dynamical properties of laminated glass | 10.1007/s12356-015-0040-z |
2015-12-01 | In this paper the projected gradient method is applied as an effective gradient-based topology optimization algorithm in order to direct energy propagation through the desired region of composites microstructure. Rayleigh Damping model is also used in order to take the effect of internal damping mechanisms into account... | Energy management through topology optimization of composites microstructure using projected gradient method | 10.1007/s00158-015-1295-z |
2015-12-01 | In this paper, we propose an augmented Lagrangian method based on the accelerated proximal gradient (APG) strategy for an inverse damped gyroscopic eigenvalue problem (IDGEP), which is a special case of the classical inverse quadratic eigenvalue problem. Under mild conditions, we show that the whole sequence of iterati... | The augmented Lagrangian method based on the APG strategy for an inverse damped gyroscopic eigenvalue problem | 10.1007/s10589-015-9757-1 |
2015-12-01 | Vibro-impacts of gear pairs in a torsion system inherently occur under the steady state torque input condition since clearance type nonlinearities are related to the torsional vibration induced by the firing stroke of an engine. In order to investigate the dynamic characteristics of gear rattle, front engine and front ... | Analysis of vibro-impacts in a torsional system under both wide open throttle and coast conditions with focus on the multi-staged clutch damper | 10.1007/s12206-015-1117-7 |
2015-12-01 | Because of the rapid progress in the state-of-the-art R&D technology in the semiconductor and optical instruments industry, the microvibration performance requirements for high-technology facilities and R&D institutes have become increasingly severe. Therefore, the microvibrations of high-technology facilities due to n... | Evaluation of microvibration control performance of a smart base isolation system | 10.1007/s13296-015-1220-8 |
2015-11-18 | The aim of this paper is to investigate oscillatory properties of a class of second-order nonlinear differential equations with damping. Employing the generalized Riccati transformation and a class of functions, several oscillation criteria are presented that improve the results obtained in the literature. Two examples... | Some oscillation results for nonlinear second-order differential equations with damping | 10.1186/s13662-015-0688-z |
2015-11-01 | A prismatic semiquadratic element with a nonclassical approximation of its displacements is suggested for modeling the composite and soft layers of a torsion bar and multilayered plate-rod structures. The stiffness, weight, damping, and geometric stiffness matrices of the above-mentioned element are obtained. Expressio... | Modeling the Elastic and Damping Properties of the Multilayered Torsion Bar-Blade Structure of Rotors of Light Helicopters of the New Generation. 1. Finite-Element Approximation of the Torsion Bar | 10.1007/s11029-015-9531-6 |
2015-11-01 | The linear plane problem of oscillations of an elliptic cylinder in an ideal incompressible fluid of finite depth in the presence of an ice cover of finite length is solved. The ice cover is modeled by an elastic plate of constant thickness. The hydrodynamic loads acting on the body are determined as functions of the o... | Oscillations of a cylindrical body submerged in a fluid with ice cover | 10.1134/S002189441506019X |
2015-11-01 | Damping effect of the overland of a sub-basin has significant impact on the simulation accuracy of large-scale routing models; however, traditional large-scale routing models have often ignored this impact. To address this problem, we propose a sub-basin response function by combining unit hydrograph theory and sub-bas... | Development of a Large-Scale Routing Model with Scale Independent by Considering the Damping Effect of Sub-Basins | 10.1007/s11269-015-1115-7 |
2015-11-01 | We study large deviations in the Langevin dynamics, with damping of order $$\epsilon ^{-1}$$ ϵ - 1 and noise of order 1, as $$\epsilon \downarrow 0$$ ϵ ↓ 0 . The damping coefficient is assumed to be state dependent. We proceed first with a change of time and then we use a weak convergence approach to large deviations a... | Large Deviations for the Langevin Equation with Strong Damping | 10.1007/s10955-015-1346-2 |
2015-11-01 | The effect of constraints for the travel of the working body of a roller damper on its tuning parameters is studied. A simple procedure for determining the tuning parameters of a roller damper with such constraints is proposed. A numerical experiment is conducted to obtain nomograms representing the dependence of the t... | Determining the Tuning Parameters for a Roller Damper with Constraints | 10.1007/s10778-015-0726-2 |
2015-11-01 | The initiation and propagation of damage such as cracks in an engineering structure under dynamic loadings is a nonlinear process. Strictly speaking, conventional eigenvalue and eigenvector extraction-based damage identification approaches are suitable for linear systems only. Due to the unique nonlinearities associate... | Model-free nonlinear restoring force identification for SMA dampers with double Chebyshev polynomials: approach and validation | 10.1007/s11071-015-2257-0 |
2015-10-01 | In this paper, the phenomenon of stochastic resonance (SR) in a harmonic oscillator with fractional-order external and intrinsic dampings under the external periodic force is investigated. Applying the Shapiro–Loginov formula, fractional Shapiro–Loginov formula, generalized fractional Shapiro–Loginov formula and the La... | Stochastic resonance in a harmonic oscillator with fractional-order external and intrinsic dampings | 10.1007/s11071-015-2174-2 |
2015-10-01 | Machining vibrations are harmful to workpiece surface quality and tool life, especially for thin-walled parts. A lightweight damping device is proposed by utilizing eddy current damping, and it can be easily attached onto the workpiece surface by glue. The cylindrical device is mainly composed of a magnet, an aluminum ... | Milling vibration attenuation by eddy current damping | 10.1007/s00170-015-7239-3 |
2015-10-01 | The equation of motion for the response of SDOF systems is presented in terms of energy for a general class of hysteretic relationships that include stiffness degrading inelastic and bilinear elastic behavior, for systems subjected to earthquake ground motions in the presence or absence of P-delta effects. The evaluati... | Energy components in nonlinear dynamic response of SDOF systems | 10.1007/s11071-015-2208-9 |
2015-10-01 | We investigate the practice of regularization (also termed damping) in inverse problems, meaning the use of prior information to supplement observations, in order to suppress instabilities in the solution caused by noisy and incomplete data. Our focus is on forms of regularization that create smooth solutions, for smoo... | Relationship Between Data Smoothing and the Regularization of Inverse Problems | 10.1007/s00024-015-1059-0 |
2015-10-01 | A numerical solution was derived to determine wave field in a converging channel bounded by rubble-mound jetties. The solution was achieved by applying boundary element method. The model was applied to analyze the effect of channel convergence, the cross-section of the jetties and their physical and damping properties ... | Wave propagation in a converging channel of arbitrary configuration | 10.1007/s13344-015-0054-7 |
2015-10-01 | In this work, a new dissipative contact force model, based on the foundation of Hertz contact law, is presented for impact analysis in multibody dynamics. A hysteresis damping force is introduced in the model for capturing the energy loss during the contact process. An approximate function, representing the relationshi... | A dissipative contact force model for impact analysis in multibody dynamics | 10.1007/s11044-015-9453-z |
2015-10-01 | In this research, a series of epoxy-silicone copolymers were prepared from methyl phenyl silicone intermediates (PMPS) with a bisphenol A type epoxy resin (E-51) by condensation with dilaurate dibutyltin acting as catalyst. The chemical structure of the siloxane-bridged epoxy resin was characterized by Fourier transfor... | Silicone modified epoxy resins with good toughness, damping properties and high thermal residual weight | 10.1007/s10965-015-0852-x |
2015-10-01 | Finite element simulations are being more and more applied when studying the crash-worthiness of vehicles during impact. This paper deals with setting up such a simulation and discusses several ways to simplify and verify a simulated crash. For this purpose, a notch impact-testing machine will be released from a certai... | Development and validation of a nonlinear dynamic impact model for a notch impact | 10.1007/s00170-015-7144-9 |
2015-10-01 | Based on the dynamic characteristics obtained with a three-dimension finite element method, a reduced mechanical model and parameters for the ship lift can be modified and obtained. Simulated analysis shows that the reduced mechanical model can adequately represent the dynamic characteristics of the ship lift. The wind... | Fuzzy semi-active control and analysis of wind-induced vibration of a ship lift | 10.1617/s11527-014-0400-x |
2015-09-01 | Discontinuous deformation analysis (DDA) is a numerical method for analyzing the deformation of block system. It employs unified dynamic formulation for both static and dynamic analysis, in which the so-called kinetic damping is adopted for absorbing dynamic energy. The DDA dynamic equations are integrated directly by ... | Performance of DDA time integration | 10.1007/s11431-015-5893-1 |
2015-09-01 | Both the friction caused by the preload in locked joints and the impact caused by clearance in unlocked joints cause energy dissipation in jointed deployable structures. The energy dissipation of locked joints is studied by analyzing the force on the infinitesimal body of the joint. The jointed beam with an unlocked jo... | Damping formulations for jointed deployable space structures | 10.1007/s11071-015-2119-9 |
2015-09-01 | In combination with a wave action balance equation, a damping model for sea waves covered by oil films of a finite thickness is proposed. The damping model is not only related to the physical parameters of the oil film, but also related to environment parameters. Meanwhile, the parametric analyses have been also conduc... | The damping model for sea waves covered by oil films of a finite thickness | 10.1007/s13131-015-0729-1 |
2015-09-01 | This paper discusses the new concept of a hybrid damper for application in low-frequency accelerometers. A hybrid damping structure is proposed in which an air damping principle and an eddy current damping principle are integrated into one damping structure. A prototype of the hybrid damper was fabricated and applied t... | An experimental study on a new air-eddy current damper for application in low-frequency accelerometers | 10.1007/s12206-015-0805-7 |
2015-09-01 | We consider the memory relaxation of an Euler–Bernoulli plate equation with nonlinear source term and internal frictional damping of arbitrary polynomial growth. The main focus is the existence of a smooth global attractor for the associated dynamical system. | Existence of smooth global attractors for nonlinear viscoelastic equations with memory | 10.1007/s00028-014-0270-2 |
2015-09-01 | The problem of the forced axisymmetric vibrations and self-heating of a hinged cylindrical shell with piezoelectric layers (sensor and actuator) is solved. The mechanical and electric excitation of vibrations is considered. The possibility of damping the mechanical vibrations by applying the appropriate voltage to the ... | Resonant Axisymmetric Vibrations and Vibrational Heating of a Viscoelastic Cylindrical Shell with Piezolayers Subject to Electromechanical Excitation | 10.1007/s10778-015-0712-8 |
2015-09-01 | A numerical implementation of system identification from non-linear and non-stationary signals is presented. The continuous wavelet transform (CWT) along with the complex Morlet wavelet skeleton curve extraction and Hilbert Transform (HT)-based methodologies are used for identification purposes. A comparison of the adv... | On the identification of damping from non-stationary free decay signals using modern signal processing techniques | 10.1007/s40091-015-0096-3 |
2015-09-01 | We investigate the dynamic stability of a pipe that conveys fluid, clamped or pinned at one end and with an intermediate support, thus exhibiting an overhang. The model of the pipe incorporates both Euler–Bernoulli and Bresse–Timoshenko schemes as well as transverse inertia. Material and external damping mechanisms are... | A contribution to the stability of an overhanging pipe conveying fluid | 10.1007/s00161-014-0357-6 |
2015-09-01 | This paper presents a new concept of multi-axis wave energy converter (WEC), which can capture wave energy from multiple directions of motion. It describes the modelling of the multi-axis WEC and presents the results of laboratory experiments on the power capture of the multi-axis WEC in a wave tank subjected to synthe... | Wave tank experiments on the power capture of a multi-axis wave energy converter | 10.1007/s00773-015-0306-5 |
2015-09-01 | The amplitude-frequency characteristic equations of a nonlinear vibroprotection system with an isochronous roller damper are obtained in the first approximation. On the basis of these equations, we carry out a numerical experiment and propose a numerical-graphical method for determining the optimal tuning parameters of... | Derivation of the amplitude-frequency characteristic equations of a vibroprotection system with an isochronous roller damper (a nonlinear model) | 10.3103/S0025654415050015 |
2015-09-01 | As a novel structural control strategy, tuned mass damper (TMD) inspired passive and semi-active smart building isolation systems are suggested to reduce structural response and thus mitigate structural damage due to earthquake excitations. The isolated structure’s upper stories can be utilized as a large scaled TMD, a... | Aseismic smart building isolation systems under multi-level earthquake excitations: Part I, conceptual design and nonlinear analysis | 10.1007/s11709-015-0307-9 |
2015-08-28 | In this paper, a kind of half-linear impulsive delay differential equations with damping is studied. By employing a generalized Riccati technique and the impulsive differential inequality, we derive several oscillation criteria which are either new or improve several recent results in the literature. In addition, we pr... | Oscillations of even order half-linear impulsive delay differential equations with damping | 10.1186/s13660-015-0791-4 |
2015-08-01 | This article is a continuation of our earlier work in Grobbelaar-Van Dalsen (Z Angew Math Phys 63:1047–1065, 2012 ) on the polynomial stabilization of a linear model for the magnetoelastic interactions in a two-dimensional electrically conducting Mindlin–Timoshenko plate. We introduce nonlinear damping that is effectiv... | Exponential stabilization of magnetoelastic waves in a Mindlin–Timoshenko plate by localized internal damping | 10.1007/s00033-015-0507-0 |
2015-08-01 | The vibration amplitude, damping ratio and viscous damping force in capacitive micromachinedultrasonic transducers (CMUTs) with a perforated membrane have been calculated theoretically and compared with the experimental data on its vibration behavior. The electrical bias of the DC and the AC voltages and the operation ... | Air damping effect on the air-based CMUT operation | 10.3938/jkps.67.486 |
2015-08-01 | Recycled waste tires when mixed with soil can play an important role as lightweight materials in retaining walls and embankments, machine foundations and railroad track beds in seismic zones. Having high damping characteristic, rubbers can be used as either soil alternative or mixed with soil to reduce vibration when s... | Shear modulus and damping ratio of sand-granulated rubber mixtures | 10.1007/s11771-015-2853-7 |
2015-08-01 | In this work we investigate the global existence, decay, and blow up of solutions for a quasilinear hyperbolic equation. We prove the decay estimates of the energy function by using Nakao’s inequality. Also, we obtain the blow up of solutions and lifespan estimates in three different ranges of the initial energy. | On the decay and blow up of solutions for a quasilinear hyperbolic equations with nonlinear damping and source terms | 10.1186/s13661-015-0395-4 |
2015-08-01 | A study on long wavelength propagation of shear and compression waves across jointed rocks is important as this condition exists in field. Wave propagation velocities and damping of waves across a jointed rock mass depend on many factors and orientation of rock joints is one of them. The experimental study on influence... | Long Wavelength Propagation of Elastic Waves Across Frictional and Filled Rock Joints with Different Orientations: Experimental Results | 10.1007/s10706-015-9874-8 |
2015-08-01 | This paper presents the use of a state of the art damper for high-precision motion stages as a sliding plate rheometer for measuring linear viscoelastic properties in the frequency range of 10 Hz–10 kHz. This device is relatively cheap and enables to obtain linear viscoelastic (LVE) fluid models for practical use in pr... | Linear viscoelastic fluid characterization of ultra-high-viscosity fluids for high-frequency damper design | 10.1007/s00397-015-0862-y |
2015-08-01 | Concern about the effects of climate change have set in motion a search for flood protection measures to adapt coastlines to the foreseen accelerated sea level rise. In this context, the potential role of salt marshes to adapt the Wadden Sea’s flood defences was explored in the Netherlands Wadden Region Delta Programme... | Salt marshes to adapt the flood defences along the Dutch Wadden Sea coast | 10.1007/s11027-015-9640-5 |
2015-08-01 | A design of offshore floating structure is mainly based on the extreme response analysis due to the forces experienced. The extreme response can induce the negative air gap response and potential impact to the deck bottom of floating structure. It is important to predict the slamming load in order to check the strength... | Sensitivity analysis of wave slamming load with respect to wind load for semi-submersible platform design | 10.1007/s12204-015-1619-6 |
2015-08-01 | In this study, the stirred casting with various processing parameters, such as stirring temperature and stirring speeds, was carried out on the Al–Pb monotectic alloys in order to make Pb particles distribute much more uniformly. More importantly, their damping capacities were systematically studied. The results show t... | Stirred casting Al–Pb monotectic alloys with high damping capacity | 10.1007/s12598-014-0312-5 |
2015-08-01 | This paper presents laboratory experiments of wave-driven hydrodynamics in a three-dimensional laboratory model of constructed coastal wetlands. The simulated wetland plants were placed on the tops of conically-shaped mounds, such that the laboratory model was dynamically similar to marsh mounds constructed in Dalehite... | Experimental study of wave dynamics in coastal wetlands | 10.1007/s10652-014-9384-x |
2015-08-01 | The dynamic mechanical properties of environment-friendly elastomeric composites consisting of reclaimed rubber (r-rubber), a waste product of roller processing of textile mill, and organic hindered phenol compound 4,4′-thio-bis(6- tert -butyl- m -methyl phenol) (AO-300) were investigated. With incorporation of AO-300 ... | Processing and characterization of reclaimed rubber composite materials | 10.1007/s13726-015-0356-x |
2015-08-01 | We suggest to apply the Bubnov–Galerkin method to solving control problems for bilinear systems. We reduce the solution of a control problem to a finite-dimensional system of linear problem of moments. We show a specific example of applying this procedure and give its numerical solution. | The Bubnov–Galerkin method in control problems for bilinear systems | 10.1134/S0005117915080032 |
2015-08-01 | This paper tries to find the reasons of differences between results from semiactive suspension simulations and from real measurements. Simulations of semiactive algorithms which have already been published in many scientific papers have showned a great potential for improvement of the suspension quality. However, exper... | Influence of MR damper response time on semiactive suspension control efficiency | 10.1007/s11012-015-0139-7 |
2015-07-01 | In this paper, we consider the damped harmonic oscillator with a time-dependent damping constant and a time-dependent angular frequency, which is actually the generalized Caldirola-Kanai Hamiltonian. For some choices of the time-dependent damping constant and the time-dependent angular frequency, we investigate the exa... | On the exact solutions of the damped harmonic oscillator with a time-dependent damping constant and a time-dependent angular frequency | 10.3938/jkps.67.404 |
2015-07-01 | Friction is the primary concern of all mechanical systems having contacting surfaces in relative motion and is a major source of loss of power and performance. Friction introduces vibrations in a system; stick-slip induced vibration is one of them. Stick-slip can result when friction coefficient decreases with velocity... | Proposed Critical Damping for a Spring Mass System to Avoid Stick Slip | 10.1007/s40032-015-0173-1 |
2015-07-01 | We consider the existence, both locally and globally in time, as well as the asymptotic behavior of solutions for the Cauchy problem of the sixth-order Boussinesq equation with damping term. Under rather mild conditions on the nonlinear term and initial data, we prove that the above-mentioned problem admits a unique lo... | Existence and asymptotic behavior of solution of Cauchy problem for the damped sixth-order Boussinesq equation | 10.1007/s10255-012-0174-2 |
2015-07-01 | The present work is motivated by the asymptotic control theory for a system of linear oscillators: the problem is to design a common bounded scalar control for damping all oscillators in asymptotically minimal time. The motion of the system is described in terms of a canonical system similar to that of the Pontryagin m... | Perturbation theory of observable linear systems | 10.1134/S0001434615070226 |
2015-07-01 | Vibratory systems that are used in linear optical scanners are significantly influenced by the properties of the surrounding fluid. Although, the dominant energy loss in scanner vibrations is caused by viscous effects, especially in non-microelectromechanical system (MEMS) scanners, the relative importance of viscous d... | An approach for nonlinear damping characterization for linear optical scanner | 10.1111/j.1747-1567.2012.00855.x |
2015-07-01 | Acoustic and damping properties of known and test chromium steels are investigated after heat treatment. Test metal microstructure and physicomechanical properties are studied. The increase in sound energy attenuation for a martensitic structure is determined. As a result of steel quenching, attenuation is reduced due ... | Development of Iron-Based Alloys with Improved Damping Capacity and Good Mechanical Properties | 10.1007/s11015-015-0089-2 |
2015-07-01 | Oscillations occurring in elastic structures and long mechanical transmissions of operating machines lead to an increase in regulation errors of the controlled coordinates and increase in the dynamic loads in electromechanical systems with elastic connections (EMSs with ECs), which decreases the quality of the manufact... | Conditions of optimization and efficiency of damping of oscillations of elastic mechanisms by an electric drive | 10.3103/S1068371215070111 |
2015-07-01 | The insertion of damped braces proves to be very effective for enhancing the performance of a framed building under seismic loads. For a widespread application of this technique suitable design procedures are needed. In this paper a design procedure which aims to proportion damped braces to attain a designated performa... | Displacement-based design procedure of damped braces for the seismic retrofitting of r.c. framed buildings | 10.1007/s10518-014-9709-7 |
2015-07-01 | The explicit equations of motion for a general $$n$$ n -body planar pendulum are derived in a simple and concise manner. A new and novel approach for obtaining these equations using mathematical induction on the number bodies in the pendulum system is used. Assuming that the parameters of the system are precisely known... | Dynamics and control of a multi-body planar pendulum | 10.1007/s11071-015-2034-0 |
2015-07-01 | This paper deals with the solution of modified-Duffing ordinary differential equation for large-amplitude vibrations of imperfect rectangular plate with viscous damping. Lindstedt's perturbation technique and Runge-Kutta method are applied. The results for both methods are presented and compared for a validity check. I... | Accurate backbone curves for large-amplitude vibrations of imperfect rectangular plate with viscous damping | 10.1007/s12205-015-0114-9 |
2015-07-01 | A model of a medium consisting of parallel layers of elastic rectangular blocks separated by deformable viscoelastic interlayers is considered. The model is proposed for describing the lowfrequency part of the spectrum in waves propagating in media with such a structure. For a twodimensional assembly consisting of 36 b... | Wave propagation in two-dimensional block media with viscoelastic layers (Theory and experiment) | 10.1134/S0021894415040161 |
2015-07-01 | It is generally accepted that the generation of antibodies proceeds due to immunization of an organism by alien antigens, and the level and affinity of antibodies are directly correlated to the presence of immunogen. At the same time, vast experimental material has been obtained providing evidence of antibodies whose l... | Hypotheses of the origin of natural antibodies: A glycobiologist’s opinion | 10.1134/S0006297915070032 |
2015-07-01 | The influences of Ca addition on the microstructures and damping capacities of AZ91-(0∼2)%Ca casting alloys were investigated, on the basis of the results of X-ray diffractometry, optical microscopy, scanning electron microscopy and vibration tests in a single cantilever mode. The amount of intermetallic compounds decr... | Effect of Ca addition on the damping capacity of Mg-Al-Zn casting alloys | 10.1007/s12540-015-4367-0 |
2015-07-01 | We establish a new Kamenev-type theorem for a class of second-order nonlinear damped delay dynamic equations on a time scale by using the generalized Riccati transformation technique. The criterion obtained improves related contributions to the subject. An example is provided to illustrate assumptions in our theorem ar... | Kamenev-type criteria for nonlinear damped dynamic equations | 10.1007/s11425-015-4974-8 |
2015-07-01 | The magnetorheological (MR) damper is one of the utmost progressive applications of asemi-active damper. Uninterrupted controllability in both on and off state is an important factor of its plenitude application. Current research is attempting to make the damper more effective and efficient by minimizing the existing l... | ANSYS finite element design of an energy saving magneto-rheological damper with improved dispersion stability | 10.1007/s12206-015-0608-x |
2015-06-17 | We investigate the features of weakly nonlinear waves in a collisional dense plasma consisting of ultra-relativistic degenerate electrons and non-relativistic degenerate ions. In weak dissipation limit, the dynamics of low frequency nonlinear ion (solitary) wave is described by solving a damped Korteweg-deVries equatio... | Weakly dissipative solitons in dense relativistic-degenerate plasma | 10.1007/s10509-015-2415-3 |
2015-06-01 | Dynamic properties of two timber floor specimens are experimentally evaluated by the impact method. Each specimen uses one specified type of connectors, either screws or nails. A numerical model is developed using constrained degrees-of-freedom for the modeling of connectors. Numerical analyses have been performed, and... | Prediction of material damping in timber floors, and subsequent evaluation of structural damping | 10.1617/s11527-014-0286-7 |
2015-06-01 | The mechanical design of turbine blades aims at verifying the structural integrity against High Cycle Fatigue damage. For this reason Forced Responses are simulated in order to evaluate the distribution of variable stress in the blade. When resonant excitation can not be avoided in service, the mechanical damping is en... | Experimental Investigation on the Damping Effectiveness of Blade Root Joints | 10.1007/s11340-015-0001-9 |
2015-06-01 | The paper deals with a thermo-mechanical problem for a slender microbeam subjected to an electric actuation; the purpose of the study is to improve the knowledge of loss mechanisms in micro-electro-mechanical devices and to predict accurately the dynamical behaviour. The thermoelastic damping in microbeam resonators is... | Vibration frequency analysis of an electrically-actuated microbeam resonator accounting for thermoelastic coupling effects | 10.1007/s40435-014-0132-3 |
2015-06-01 | Performance of rotational friction dampers with two and three units was evaluated experimentally because of a lack of research data on performance of these dampers with multi units. Results of multi-unit dampers were compared with the results of one-unit damper. Increasing trend in dissipating energy was observed. Then... | Experimental and numerical investigation of rotational friction dampers with multi units in steel frames subjected to lateral excitation | 10.1016/j.acme.2014.05.009 |
2015-06-01 | This paper deals with the investigation of the performance of the skew or the rectangular patches of the active constrained layer damping (ACLD) treatment for active damping of geometrically nonlinear vibrations of skew doubly curved laminated composite shells. Developing a three-dimensional nonlinear electro-mechanica... | Performance of skew or rectangular smart patches for active damping of nonlinear vibrations of skew doubly curved laminated composite shells | 10.1007/s10999-014-9290-x |
2015-06-01 | When a model for quantum noise is exactly solvable, a Kraus (or operator-sum) representation can be derived from the spectral decomposition of the Choi matrix for the channel. More generally, a Kraus representation can be obtained from any positive-sum (or ensemble) decomposition of the matrix. Here we extend this idea... | The operator-sum-difference representation of a quantum noise channel | 10.1007/s11128-015-0965-5 |
2015-06-01 | Accurate prediction of dynamic soil properties is very important to basic understanding of soil behavior and also practical soil modeling. Shear modulus and damping ratio play a vital role in the design of geotechnical structures subjected to dynamic loads. In this study, artificial neural network (ANN), and adaptive n... | Predicting damping ratio of fine-grained soils using soft computing methodology | 10.1007/s12517-014-1493-9 |
2015-06-01 | ^15N longitudinal relaxation rates are extensively used for the characterization of protein dynamics; however, their accurate measurement is hindered by systematic errors. ^15N CSA/^1H–^15N dipolar cross-correlated relaxation (CC) and amide proton exchange saturation transfer from water protons are the two main sources... | An optimized method for ^15N R_1 relaxation rate measurements in non-deuterated proteins | 10.1007/s10858-015-9937-4 |
2015-06-01 | We analyze two identical qubits interacting with a single-mode quantized radiation field, taking into account the influence of phase damping. The qubits are assumed to be initially in a superposition of the excited and the ground states, and the field is in a coherent state. The effects of the damping on the purity los... | Effects of a phase-damping cavity on entanglement and purity loss in two-qubit system | 10.1007/s11128-015-0952-x |
2015-06-01 | Model-based feedforward–feedback tracking control has been shown as one of the most effective methods for real-time hybrid simulation (RTHS). This approach assumes that the servo-hydraulic system is a linear time-invariant model. However, the servo-control closed-loop is intrinsically nonlinear and time-variant, partic... | Adaptive model-based tracking control for real-time hybrid simulation | 10.1007/s10518-014-9681-2 |
2015-05-21 | In this present paper, the existence of pullback attractors for the 2D Navier-Stokes equation with weak damping and continuous delay is considered; by virtue of the classical Galerkin method, we derive the existence and uniqueness of global weak and strong solutions. Using the Aubin-Lions lemma and some energy estimate... | Pullback attractors of 2D Navier-Stokes equations with weak damping and continuous delay | 10.1186/s13661-015-0344-2 |
2015-05-01 | This paper presents a solution of the boundary-value problem of the stress–strain state of a friction unit placed in the gap between rigid rotating cylinders. It is assumed that the two-layer incompressible material of these unit has elastic, viscous, and plastic properties and different values of the elastic moduli, s... | Accounting for the elastic properties of viscoplastic lubricant between coaxial rotating cylinders | 10.1134/S0021894415030244 |
2015-05-01 | The paper summarizes the results of approximate calculation of the influence of amplitudedependent dissipation of energy on vibrodiagnostic parameters of the presence of a closing mode I edge crack in beams of rectangular cross-section for different end restrain conditions and different cases of harmonic excitation of ... | The Influence of Amplitude-Dependent Damping on Vibrodiagnostic Parameters of the Presence of a Closing Crack in a Beam Under Subharmonic Resonance | 10.1007/s11223-015-9668-5 |
2015-05-01 | A 3D time-domain Rankine source method is developed to study the hydrodynamic loads and motions of a moored ship in shallow water waves in head sea conditions. Both the wave steepness and ship motions relative to the ship’s draft are assumed small and the exact free-surface and body-boundary conditions are expanded abo... | A numerical investigation of second-order difference-frequency forces and motions of a moored ship in shallow water | 10.1007/s40722-015-0014-6 |
2015-05-01 | Trypanosoma cruzi infection and Chagas disease remains among the most neglected of the neglected tropical diseases. Despite this, studies of the immune response to T. cruzi have provided new insights in immunology and guidance for approaches for prevention and treatment of the disease. T. cruzi represents one of the ve... | CD8^+ T cells in Trypanosoma cruzi infection | 10.1007/s00281-015-0481-9 |
2015-04-01 | The design and numerical simulation of a linear generator for use in an automobile shock absorber are presented in this paper. The conceived linear generator employs high-performance rare earth permanent magnets with compact size to ensure efficient energy recovery. Finite element analysis and Matlab simulation are uti... | Design and analysis of energy-harvesting shock absorber with electromagnetic and fluid damping | 10.1007/s12206-015-0331-7 |
2015-04-01 | Low-yield-strength steel (LYS100, yield stress 100 N/mm^2) is utilized here to design a shear panel damper for its high ductility. Deformation capacity of the low-yield-strength steel shear panel damper (LYSPD) is known to be affected by out-of-plane buckling which denies precise prediction by the buckling ratio obtain... | The performance of low-yield-strength steel shear-panel damper with without buckling | 10.1617/s11527-013-0228-9 |
2015-04-01 | To study the influence of construction interfaces on dynamic characteristics of roller compacted concrete dams (RCCDs), mechanical properties of construction interfaces are firstly analyzed. Then, the viscous-spring artificial boundary (VSAB) is adopted to simulate the radiation damping of their infinite foundations, a... | Influence of construction interfaces on dynamic characteristics of roller compacted concrete dams | 10.1007/s11771-015-2669-5 |
2015-04-01 | In the present day scenario, materials with high damping capacity and good mechanical properties are significant to suppress mechanical vibrations. In pure metals or alloys, even though the mechanical properties are fairly good, the damping capacity was found to be stumpy. Composites are a better choice which simultane... | Damping Behavior of Metal Matrix Composites | 10.1007/s12666-014-0462-z |
2015-04-01 | Methods are proposed for determining the logarithmic decrements (damping coefficients) of structural vibrations from the experimental amplitude-frequency characteristics and the imaginary and real components of the frequency characteristics of the displacements, velocities, and accelerations. | Determining the logarithmic decrements in resonant tests of structures | 10.3103/S1068798X15040061 |
2015-04-01 | We investigate energy decay for solutions to the wave equation $\partial_{t}^{2}u+a(x)\partial_{t}u-\Delta u=0$ , with damping coefficient a ≥0, where Δ is the Laplace–Beltrami operator on a compact Riemannian manifold M . We make a weak regularity hypothesis on the metric tensor of M , though one that guarantees the u... | Wave Decay on Manifolds with Bounded Ricci Tensor, and Related Estimates | 10.1007/s12220-013-9454-1 |
2015-04-01 | Many material and mechanical systems, such as magnetorheological (MR) dampers used for reducing vibration in engineering systems, have long-standing modeling and control problems because of their nonlinear hysteresis behavior. Existing hysteresis models, including discontinuous and piecewise-continuous functions, are n... | Continuous hysteresis model using Duffing-like equation | 10.1007/s11071-015-1926-3 |
2015-04-01 | The performance assessment and optimal design of fluid viscous dampers through life-cycle cost criteria is discussed in this paper. A probabilistic, simulation-based framework is described for estimating the life-cycle cost and a stochastic search approach is developed to support an efficient optimization under differe... | Performance assessment and optimization of fluid viscous dampers through life-cycle cost criteria and comparison to alternative design approaches | 10.1007/s10518-014-9646-5 |
2015-04-01 | In service robotics, control systems allowing for skillful manipulation and dexterity constitute one of the most valuable technologies. Recently, control approaches inspired by humans or animals have attracted widespread attention, due to their merit of allowing various tasks to be performed naturally without precisely... | Task space control considering passive muscle stiffness for redundant robotic arms | 10.1007/s11370-015-0165-2 |
2015-03-31 | Background Magneto-rheological (MR) damper is one of the most promising semi-active devices. The MR dampers offer a reliability of a passive system yet maintain the versatility and adaptability of the fully active control devices. Methods In this paper, an optimization process is developed to optimize the geometrical p... | Geometric parameter optimization of magneto-rheological damper using design of experiment technique | 10.1186/s40712-015-0031-1 |
2015-03-26 | This paper is concerned with oscillations of certain second-order Emden-Fowler variable delay functional dynamic equations with damping and neutral of the form [ A ( t ) φ ( y Δ ( t ) ) ] Δ + b ( t ) φ ( y Δ ( t ) ) + P ( t ) F ( φ ( x ( δ ( t ) ) ) ) − Q ( t ) f ( φ ( x ( γ ( t ) ) ) ) = 0 $$\bigl[A(t)\varphi\bigl(y^{... | Oscillation criteria for certain second-order Emden-Fowler delay functional dynamic equations with damping on time scales | 10.1186/s13662-014-0338-x |
2015-03-04 | In this paper, we present a new approach via variational methods and critical point theory to obtain the existence and multiplicity of solutions to a class of damped vibration problems with impulsive effects on time scales. By establishing a proper variational set, two existence results and two multiplicity results are... | An application of variational approach to a class of damped vibration problems with impulsive effects on time scales | 10.1186/s13661-015-0305-9 |
2015-03-01 | Structures consisting of concrete and steel parts, which are irregular in damping ratios are investigated. This investigation is a code-based seismic design of such structures. Several practical difficulties encountered, due to inherent differences in the nature of dynamic response of each part, and the different dampi... | Parametric study on equivalent damping ratio of different composite structural building systems | 10.1007/s13296-015-3001-9 |
2015-03-01 | The SMA was studied for their macroscopic application in damping for civil engineering. The study is a synthesis and includes an outline of the models required for the SMA simulation and some case studies using the finite element analysis methods. This work is an overview that focuses in the mitigation of the oscillati... | Shape memory alloys as an effective tool to damp oscillations | 10.1007/s10973-015-4405-7 |
2015-03-01 | Owing to the interactions among the complex terrain, bottom materials, and the complicate hydrodynamics, typhoon waves show special characteristics as big waves appeared at the high water level (HWL) and small waves emerged at low and middle water levels (LWL and MWL) in radial sand ridges (RSR). It is assumed that the... | The study on the bottom friction and the breaking coefficient for typhoon waves in radial sand ridges—the Lanshayang Channel as an example | 10.1007/s13131-015-0637-4 |
2015-03-01 | In the present paper a vibrational differential equation governing on a rigid beam on viscoelastic foundation has been investigated. The nonlinear differential equation governing on this vibrating system is solved by a simple and innovative approach, which has been called Akbari-Ganji’s method (AGM). AGM is a very suit... | Solving nonlinear differential equation governing on the rigid beams on viscoelastic foundation by AGM | 10.1007/s11804-015-1284-z |
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