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2012-06-01 | Elastic-plastic steel damper (EPSD) is a new device controlling seismic responses. The mechanical principle of EPSD was presented and a comparison was conducted between the theoretical formulas and finite element (FE) simulation of damper units. The verified force-displacement hysteretic curve of the damper system was ... | Study on seismic response control of a single-tower self-anchored suspension bridge with elastic-plastic steel damper | 10.1007/s11431-012-4826-5 |
2012-05-01 | Organic hybrids of polyacrylate emulsion (PAE)/hindered phenol (3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid thiodi-2,1-ethanediyl ester, abbreviated as Irganox-1035) have been prepared in this study. The dynamic mechanical properties, denoted by storage modulus (E′) and loss factor (tanδ), of this binary ... | Studies on the damping properties of polyacrylate emulsion/hindered phenol hybrids | 10.1038/pj.2012.6 |
2012-05-01 | The literature includes a variety of analytical and semi-analytical models to describe squeeze-film damping in MEMS perforated structures. Even if many of them have been validated by means of numerical simulations, nobody seems to have discussed about the accuracy of numerical approaches in this field. In the present p... | Analytical and numerical modeling of squeeze-film damping in perforated microstructures | 10.1007/s10404-011-0931-1 |
2012-04-13 | This study investigates the existence of global solutions to a class of nonlinear damped wave operator equations. Dividing the differential operator into two parts, variational and non-variational structure, we obtain the existence, uniformly bounded and regularity of solutions. Mathematics Subject Classification 2000 ... | Global solutions to a class of nonlinear damped wave operator equations | 10.1186/1687-2770-2012-42 |
2012-04-01 | In the present paper we establish results concerning the decay of the energy related to the damped Korteweg–de Vries equation posed on infinite domains. We prove the exponential decay rates of the energy when a initial value problem and a localized dissipative mechanism are in place. If this mechanism is effective in t... | Decay of Solutions to Damped Korteweg–de Vries Type Equation | 10.1007/s00245-011-9156-7 |
2012-04-01 | This work proposes an image-based visual servoing scheme applied to a class of overactuated planar parallel robots with revolute joints. A Proportional Derivative algorithm computes torques for the robot active joints. The Derivative action operates at the joint level and the Proportional action works at the visual lev... | Visual Control of Planar Parallel Robots Without Using Velocity Measurements | 10.1007/s10846-011-9609-x |
2012-04-01 | This study examines the small-strain dynamic properties of mixtures composed of sandy and gravelly soils with granulated tire rubber in terms of shear modulus (G_O), and damping ratio in shear (D_min). Torsional resonant column tests are performed on dry, dense specimens of soil-rubber mixtures in a range of soil to ru... | Small-Strain Shear Modulus and Damping Ratio of Sand-Rubber and Gravel-Rubber Mixtures | 10.1007/s10706-011-9473-2 |
2012-04-01 | Context Increased knowledge on diversity in wood properties would have implications both for fundamental research and for promoting a diversification of uses as material. Aims The objective is to contribute to overcoming the critical lack of data on the diversity of wood dynamic mechanical/viscoelastic vibrational prop... | Characterisation and categorisation of the diversity in viscoelastic vibrational properties between 98 wood types | 10.1007/s13595-011-0166-z |
2012-04-01 | This paper utilizes the Discrete Element Method to characterize energy dissipation mechanisms in cyclically loaded soils based on micromechanical considerations. Computational simulations of consolidated undrained cyclic triaxial tests were conducted at various relative densities and were subjected to cyclic loading of... | Microscale Energy Dissipation Mechanisms in Cyclically-Loaded Granular Soils | 10.1007/s10706-011-9472-3 |
2012-04-01 | In this paper, we focus on studying approximate solutions of damped oscillatory solutions of the compound KdV-Burgers equation and their error estimates. We employ the theory of planar dynamical systems to study traveling wave solutions of the compound KdV-Burgers equation. We obtain some global phase portraits under d... | Approximate damped oscillatory solutions for compound KdV-Burgers equation and their error estimates | 10.1007/s10255-012-0147-5 |
2012-04-01 | Several damping materials have been employed to reduce the vibration of marine structures. In this paper, a new method of identifying system matrices for non-proportional damping structures using modal parameters is proposed. This method has two advantages. First, the mass and stiffness matrices do not need to be calcu... | Direct identification of non-proportional modal damping matrix for lumped mass system using modal parameters | 10.1007/s12206-012-0221-1 |
2012-04-01 | The process of damping oscillations of a rod consisting of two dissimilar segments and fixed at one end is considered. The damping is carried out by means of a boundary control at the other end of the rod. | On the complete damping of oscillations of an inhomogeneous rod by means of a boundary control at one end | 10.1134/S0081543812020083 |
2012-04-01 | Vibrational properties of wood are affected by several parameters, of which extractives can be one of the most important ones. Wood for European musical instruments has been often studied, but traditional Middle Eastern ones had been left unnoticed. In this study white mulberry ( Morus alba L.), the main material for l... | Effect of extractions on dynamic mechanical properties of white mulberry (Morus alba) | 10.1007/s10086-011-1225-7 |
2012-03-01 | From a macroscopic perspective, saturated porous materials like soils represent volumetrically interacting solid–fluid aggregates. They can be properly modelled using continuum porous media theories accounting for both solid-matrix deformation and pore-fluid flow. The dynamic excitation of such multi-phase materials gi... | Dynamic wave propagation in infinite saturated porous media half spaces | 10.1007/s00466-011-0647-9 |
2012-03-01 | The paper presents some findings of numerical investigations of torsional vibrations in steam turbine shafting in the turbogenerator abnormal operation modes (short circuit, random paralleling start, etc.). The shafting vibrations are shown to be essentially dependant on the reaction torque surge parameters (magnitude,... | Torsional vibrations in steam turbine shafting in turbogenerator abnormal modes of operation | 10.1007/s11223-012-9370-9 |
2012-03-01 | In this paper, the controllability problem is discussed for the damped second-order impulsive neutral functional differential systems with infinite delay in Banach spaces. Sufficient conditions for controllability results are derived by means of the Sadovskii fixed point theorem combined with a noncompact condition on ... | Controllability of Damped Second-Order Impulsive Neutral Functional Differential Systems with Infinite Delay | 10.1007/s10957-011-9926-z |
2012-03-01 | The damping of the relaxation modulus under step shear deformation is weaker for multi-branched polymers such as comb polymers than for linear polymers. This weak damping has been related to the hierarchical relaxation, the branched arm relaxation occurring prior to the backbone relaxation and dilating the entanglement... | Primitive chain network simulations for comb-branched polymer under step shear deformations | 10.1007/s00397-011-0574-x |
2012-03-01 | Nonlinear dust-acoustic (DA) shock waves are addressed in a nonextensive dusty plasma exhibiting self-consistent nonadiabatic charge variation. Our results reveal that the amplitude, strength and nature of the DA shock waves are extremely sensitive to the degree of ion nonextensivity. Significant differences in the pot... | Nonextensive collisioneless dust-acoustic shock waves in a charge varying dusty plasma | 10.1007/s10509-011-0905-5 |
2012-03-01 | This paper deals with the problem of the bounded traveling wave solutions’ shape and the solution to the generalized Whitham-Broer-Kaup equation with the dissipation terms which can be called WBK equation for short. The authors employ the theory and method of planar dynamical systems to make comprehensive qualitative a... | Shape analysis of bounded traveling wave solutions and solution to the generalized Whitham-Broer-Kaup equation with dissipation terms | 10.1007/s11401-012-0697-0 |
2012-02-01 | In this paper, a viscoelastic equation with nonlinear boundary damping and source terms of the form $$\begin{array}{llll}u_{tt}(t)-\Delta u(t)+\displaystyle\int\limits_{0}^{t}g(t-s)\Delta u(s){\rm d}s=a\left\vert u\right\vert^{p-1}u,\quad{\rm in}\,\Omega\times(0,\infty), \\ \qquad\qquad\qquad\qquad\qquad u=0,\,{\rm on}... | General decay and blow-up of solutions for a viscoelastic equation with nonlinear boundary damping-source interactions | 10.1007/s00033-011-0151-2 |
2012-02-01 | An automatic control system for electrically driven hoisting devices is investigated. An acceleration sensor for the calculation of the coordinate of the engine moment, the speed of movement, and the displacement angle is proposed. Synthesis of the system of the subordinate regulation adapted to the operating mode is c... | Synthesis of a control system for hoisting devices | 10.3103/S1068371212020046 |
2012-02-01 | Vibrating wire viscometers rely on the principle that the viscosity of the fluid surrounding the wire provides the dominant damping action on the motion of the wire. However, some residual damping is always present due to other effects such as internal friction of the wire (anelastic relaxation), losses through the wir... | Magnetic Damping Effects in Forced-Oscillation Vibrating-Wire Viscometers | 10.1007/s10765-012-1157-5 |
2012-02-01 | In this paper, thermoelastic damping (TED) in a micro-beam resonator with a pair of piezoelectric layers bonded on its upper and lower surfaces is investigated. Equation of motion is derived and the thermoelasticity equation is governed using two dimensional non-Fourier heat conduction model based on continuum theory f... | Thermoelastic Damping in a Micro-Beam Resonator Tunable with Piezoelectric Layers | 10.1016/S0894-9166(12)60008-1 |
2012-02-01 | Through a box model of the subpolar North Atlantic, we examine the genesis and predictability of the Atlantic Multidecadal Variability (AMV), posited as a linear perturbation sustained by the stochastic atmosphere. Postulating a density-dependent thermohaline circulation (THC), the latter would strongly differentiate t... | A minimal model of the Atlantic Multidecadal Variability: its genesis and predictability | 10.1007/s00382-011-1007-3 |
2012-02-01 | In turbomachinery, the perfect detuning of turbine blades in order to avoid high cycle fatigue damage due to resonant vibration is often unfeasible due to the high modal density of bladed disks. To obtain reliable predictions of resonant stress levels of turbine blades, accurate modeling of friction damping is mandator... | Numerical assessment of friction damping at turbine blade root joints by simultaneous calculation of the static and dynamic contact loads | 10.1007/s11071-011-0119-y |
2012-02-01 | The PZT thin films were prepared on (111)- Pt/Ti/SiO_2/Si substrates by sol-gel method, and lead acetate [Pb(CH_3COO)_2], zirconium nitrate [Zr(NO_3)_4] were used as raw materials. The X-ray diffractometer (XRD) and scanning electron microscopy (SEM) were used to characterize the phase structure and surface morphology ... | Influence of annealing time on the microstructure and properties of Pb(Zr_0.53Ti_0.47)O_3 thin films | 10.1007/s11595-012-0413-7 |
2012-02-01 | A novel intelligent semi-active control system for an eleven degrees of freedom passenger car’s suspension system using magnetorheological (MR) damper with neuro-fuzzy (NF) control strategy to enhance desired suspension performance is proposed. In comparison with earlier studies, an improvement in problem modeling is m... | Intelligent semi-active vibration control of eleven degrees of freedom suspension system using magnetorheological dampers | 10.1007/s12206-011-1007-6 |
2012-01-01 | Since material losses of many engineering materials are known to be independent on frequency, the viscous damping is not always appropriate model of damping. In the case of structures, the effect of damping is usually small far from the system resonance. Unlike the case of structures, the material damping of rotor can ... | Exponential Damping as an Approach to Internal Hysteretic Damping of Rotor Systems: FEM Model of Timoshenko Rotating Beam with Maxwell-Weichert Damping Model | 10.1007/978-94-007-5125-5_34 |
2012-01-01 | While hopping, 12 subjects experienced a sudden step down of 5 or 10 cm. Results revealed that the hopping style was “terrain following”. It means that the subjects pursued to keep the distance between maximum hopping height (apex) and ground profile constant. The spring-loaded inverse pendulum (SLIP) model, however, w... | Energy management that generates terrain following versus apex-preserving hopping in man and machine | 10.1007/s00422-012-0476-8 |
2012-01-01 | Friction mechanism has an extensive usage in many different fields for energy dissipation. It is also used at buildings to reduce the displacement that is caused by ground acceleration during an earthquake. Despite friction damper is a simple device to use on structures, due to its nonlinear characteristic, analysis an... | Frequency Domain Optimization of Dry Friction Dampers on Buildings Under Harmonic Excitation | 10.1007/978-1-4614-2413-0_12 |
2012-01-01 | The idea of using the distributed-order differential equation first proposed by Caputo in (1969) is at least mathematically interesting as demonstrated in the previous chapters. However, people may question its usefulness in engineering practice. In this chapter, we included two generic applications. One is on distribu... | Distributed-Order Filtering and Distributed-Order Optimal Damping | 10.1007/978-1-4471-2852-6_4 |
2012-01-01 | Nonlinear elastic effects play an important role in the dynamics of microelectromechanical systems (MEMS). A Duffing oscillator is widely used as an archetypical model of mechanical resonators with nonlinear elastic behavior. In contrast, nonlinear dissipation effects in micromechanical oscillators are often overlooked... | Nonlinear damping in a micromechanical oscillator | 10.1007/s11071-011-0031-5 |
2012-01-01 | The dynamic analysis is an important part of basic research of complex planetary transmission systems with split power flow. The bifurcation characteristics of the resonance courses especially for high-speed weakly and strongly non-linear parametric and in the damping time-heteronymous systems are highly sensitive to t... | Dynamic Analysis of Resonance: Bifurcation Characteristics of Non-linear Parametric Systems | 10.1007/978-94-007-5125-5_25 |
2012-01-01 | The single degree-of-freedom system subject to mass and base excitation is used to model an elastic system to determine the frequency-domain effects of squeeze film air damping and viscous fluid damping. This model is also used to determine the important response characteristics of electrostatic attraction and van der ... | Spring-Mass Systems | 10.1007/978-94-007-2672-7_2 |
2012-01-01 | A nonlinear model of monotube hydraulic dampers is presented with an emphasis on the shim stack properties and their effects on the overall damper performance. There has been no published detailed analysis of the effects of shim stack design in a hydraulic damper to date. Other damper models have used simplifying assum... | Nonlinear modeling and experimental characterization of hydraulic dampers: effects of shim stack and orifice parameters on damper performance | 10.1007/s11071-011-0079-2 |
2012-01-01 | Extremum seeking is realized via a state regulator that drives the state along a convergent set point sequence generated by a numerical optimization algorithm. In this chapter, we propose an asymptotic state regulator design for state feedback linearizable systems, where we trade off finite time state regulation to obt... | Asymptotic State Regulator Design | 10.1007/978-1-4471-2224-1_5 |
2012-01-01 | Chapter 10 studies the optimal non-delayed fractional-order damping, time-delayed fractional-order damping, and optimal distributed order fractional damping based on ISE, ITSE, IAE and ITAE performance criteria. The comparisons of the step responses of the integer-order and the three types of fractional-order damping s... | Optimal Fractional-Order Damping Strategies | 10.1007/978-1-4471-2233-3_10 |
2012-01-01 | In order to enhance the low voltage ride through (LVRT) capability of full power converter, an improved control strategy was proposed. LCL filter was used to reduce the harmonics. An active damping method was introduced for the passive damping producing great quantity losses. A lead-lag element was added to enhance the... | LVRT Control Strategy of Full Power Converter with LCL Filter | 10.1007/978-3-642-26001-8_43 |
2012-01-01 | The investigated semiactive damping element works on the principle of squeezing two lubricating layers formed by classical and magneto rheological oils. The damping effect is controlled by the change of intensity of magnetic field passing through the layer of magneto rheological lubricant. The developed mathematical mo... | Reducing the Steady State Vibrations of Flexible Rotors by Squeezing Thin Layers of Normal and Magneto Rheological Oils | 10.1007/978-94-007-5125-5_36 |
2012-01-01 | Damping and loss factor assessment of high damped materials is a challenging task addressed in the past by several researchers, one of the most important is H. Oberst who defined a standard method to tackle the issue. In this paper a sandwich beam composed of two aluminium layers separated by the damping material has b... | Damping Properties Assessment of Very Highly Compliant Sandwich Materials: Are Traditional Methods Really Too Old? | 10.1007/978-1-4614-2425-3_6 |
2012-01-01 | A new type of electromagnetic function material named magneto-thixotropic gel (MTG) is proposed in this chapter. Based on the material, the author proposed a new working model—the wedge-squeezing model which can improve the mechanical properties of the damping devices. By calculating and analyzing the model, it is foun... | Modeling and Analysis of High-efficiency Wedge-squeezing Model for Electromagneto-thixotropic Damping Devices | 10.1007/978-1-4419-8849-2_50 |
2012-01-01 | This chapter presents a systematic method to describe a large class of switched-mode power converters within the Brayton–Moser (BM) framework, a framework that has proven to be useful for analysis and control purposes. The approach forms an alternative to the switched Lagrangian and (port-)Hamiltonian formulations. The... | Power-Based Modelling | 10.1007/978-1-4471-2885-4_8 |
2012-01-01 | This paper explores methods that can be used to characterize weakly nonlinear systems, whose natural frequencies and damping ratios change with response amplitude. The focus is on high order systems that may have several modes although each with a distinct natural frequency. Interactions between modes are not addressed... | Identifying the Modal Properties of Nonlinear Structures Using Measured Free Response Time Histories from a Scanning Laser Doppler Vibrometer | 10.1007/978-1-4614-2416-1_22 |
2012-01-01 | This paper discusses the improvements in small signal performance of a multi machine power system under the impact of Power System Stabilizer (PSS) and Static Compensator (STATCOM) devices. Parameters of both devices are optimized independently using MATLAB control system tools. PSS lead-lag network is designed using b... | Improvement of Small Signal Performance of Multi Machine Power System Using SMIB Based PSS and STATCOM Designs | 10.1007/978-3-642-28962-0_19 |
2012-01-01 | We consider issues related to the design of mechanical systems that feature nonlinear vibratory behavior. Designs that account for, and also exploit, nonlinear dynamics are considered. The chapter provides a brief overview of general considerations related to these issues, and then considers in detail the case of vibra... | Designing Nonlinear Torsional Vibration Absorbers | 10.1007/978-3-7091-1187-1_4 |
2012-01-01 | The chapter deals with autoparametric vibrations of a system composed of a nonlinear oscillator with an attached pendulum. Dynamics of the mechanical structure is studied analytically around the principal parametric resonance region, numerically and experimentally for a wide range of parameters. The influence of dampin... | Autoparametric Vibrations of a Nonlinear System with a Pendulum and Magnetorheological Damping | 10.1007/978-94-007-2473-0_1 |
2012-01-01 | For oscillation damping of a multi link flexible arm under gravity this paper exploits the image data already acquired by an eye-in-hand camera used for visual servoing. It replaces commonly applied distributed strain measurements in a model free oscillation damping control concept. Based on simulations and experiments... | Predictive Delay Compensation for Camera Based Oscillation Damping of a Multi Link Flexible Robot | 10.1007/978-3-642-33503-7_10 |
2012-01-01 | Our recent analysis on nonlinear nonextensive dust-acoustic waves (DA) [Amour and Tribeche in Phys. Plasmas 17:063702, 2010] is extended to include self-consistent nonadiabatic grain charge fluctuation. The appropriate nonextensive electron charging current is rederived based on the orbit-limited motion theory. Our res... | Nonextensive dust acoustic waves in a charge varying dusty plasma | 10.1007/s10509-011-0830-7 |
2012-01-01 | The dynamics of a system of coupled oscillators possessing strongly nonlinear stiffness and damping is examined. The system consists of a linear oscillator coupled to a strongly nonlinear, light attachment, where the nonlinear terms of the system are realized due to geometric effects. We show that the effects of nonlin... | Dynamic instabilities in coupled oscillators induced by geometrically nonlinear damping | 10.1007/s11071-011-0028-0 |
2012-01-01 | On February 27, 2010 one of the largest magnitude earthquake ever registered occurred in Chile. Although, several tall buildings suffered damage without collapse, the response of these buildings, in general, has been considered a success. Several studies have been carried out to understand the seismic response of these... | Modal Parameter Variation of an Earthquake Damaged Building | 10.1007/978-1-4614-2413-0_39 |
2012-01-01 | The sensitivity of the response characteristics of a bolted interface to the bolt preload level used in the joint can often cause the dynamic properties of a system to be difficult to predict. A bolted interface test fixture was fabricated to investigate the effects of preload changes on the system dynamic response cha... | Simplified Nonlinear Modeling Approach for a Bolted Interface Test Fixture | 10.1007/978-1-4614-2416-1_7 |
2012-01-01 | A new type of generalized Lax-Friedrichs scheme for the convective-diffusion equation u _ t + au _ x = εu _ xx ( a ∈ R , ε > 0) is given and analyzed. For the convection term, the scheme use generalized Lax-Friedrichs scheme. For the diffusion term, it uses implicit central difference scheme. The scheme is discu... | Generalized Lax-Friedrichs Scheme for Convective-Diffusion Equation | 10.1007/978-3-642-34038-3_44 |
2012-01-01 | In this paper, an infinite family of solutions describing solitary wave packets with a finite number of nodes is presented. These structures arise from the study of damping in the framework of non-linear ordinary differential equations with oscillatory behaviour. Usually one expects to find effects of this kind in phys... | Solitary wavepackets from oscillatory non-linear equations with damping | 10.1007/s11071-011-9957-x |
2012-01-01 | A new Modular Recurrent Trainable Neural Network (MRTNN) has been used for system identification of two-mass-resort-damper nonlinear oscillatory plant. The first MRTNN module identified the exponential part of the unknown plant and the second one - the oscillatory part of the plant. The plant has been controlled by a d... | Recurrent Neural Identification and an I-Term Direct Adaptive Control of Nonlinear Oscillatory Plant | 10.1007/978-3-642-33185-5_24 |
2012-01-01 | The objective of this research is aimed to design and implement a Wearable Hybrid Assisted Lower Limb Orthosis (HALLO), which could provide up to 10% of knee torque support. The proposed device adopted a specially designed M-shaped flexible mechanism to store the potential energy due to different human body gestures, s... | On the Design and Implementation of a Wearable Hybrid Assisted Lower Limb Orthosis | 10.1007/978-3-642-28314-7_6 |
2012-01-01 | Let’s extend the two degree of freedom free vibration analysis from Chap. 4 to include externally applied forces so that we can analyze two degree of freedom forced vibration. The general case is that a separate harmonic force is applied at each coordinate; see Fig. 5.1. However, we are considering only linear systems,... | Two Degree of Freedom Forced Vibration | 10.1007/978-1-4614-0460-6_5 |
2012-01-01 | The present paper deals with a brief review on different modeling techniques used to model friction dampers in turbomachinery. It is not the intention of the author to provide a detailed survey on all the approaches. However, the main concentration is on finite element modeling and bondgraph modeling. The main purpose ... | A Brief Review on Modeling Approaches of Friction Dampers Used in Turbomachinery | 10.1007/978-81-322-0491-6_31 |
2012-01-01 | The physical and thermodynamic properties of a repulsive clathrate used as a working body for the dissipation, storage, and conversion of energy in thermomechanical systems are studied. In repulsive clathrates, use is made for the first time of the molecular repulsive forces acting in large interfacial areas in a syste... | Rheology and dynamics of repulsive clathrates | 10.1134/S0021894412010130 |
2012-01-01 | The optimal design of the magnetorheological (MR) dampers is important to meet the engineering applications and obtain better performance compared with the conventional design methods. In this chapter, a multiobjective optimization method, based on Parallel-plate Model and genetic algorithms, is proposed to obtain the ... | Multiobjective Optimization of Structural Parameters Designing for Magnetorheological Damper Based on Genetic Algorithms | 10.1007/978-1-4419-8849-2_187 |
2012-01-01 | ^1Research in this article was carried out at Washington State University (WSU) while the author was a visiting scholar at WSU. This article proposes an algorithm denoted Frequency-Domain Optimization (FDO) for real-time modal estimation of power system oscillatory modes based on multiple synchronized Phasor Measuremen... | Multi-Dimensional Modal Analysis in Large Power Systems from Ambient Data Based on Frequency-Domain Optimization | 10.1007/978-1-4614-1605-0_8 |
2012-01-01 | Alfalfa Alfalfa ( Medicago sativa Medicago sativa L.) is affected by several pathogens; however, those that attack crown and roots, such as Macrophomina phaseolina Macrophomina phaseolina , directly define the longevity or productive period of the plant. Use of microorganisms with biological control capacity constitute... | Isolation and Characterization of Rhizobacteria Antagonistic to Macrophomina phaseolina (Tassi) Goid., Causal Agent of Alfalfa Damping-Off | 10.1007/978-94-007-1591-2_10 |
2012-01-01 | This paper presents a theory describing the fluid mechanics of whale flukeprints. It contains excerpts of a longer paper recently published in the International Journal of Non-Linear Mechanics special issue on biological structures. Whale flukeprints are smooth oval-shaped water patches that form on the surface of the ... | Formation of Ocean Surface Patterns by Cetacean Fluke Oscillations | 10.1007/978-1-4614-3997-4_11 |
2012-01-01 | Recent vibration serviceability problems of many structures have drawn researchers’ attention to the walking-induced vibration modelling and assessment of floors and footbridges. Stochastic nature of human-induced vibration and its dependency on numerous conditions significantly reduce the accuracy of the current non-s... | Comparative Evaluation of Current Pedestrian Traffic Models on Structures | 10.1007/978-1-4614-2413-0_5 |
2012-01-01 | Chapter 8 deals with nonoscillation problems for a scalar linear delay differential equation of the second order including explicitly a term with the first derivative which is usually called “a damping term”. Most of publications deal with equations not containing the term with the first derivative; for these equations... | Second-Order Delay Differential Equations with Damping Terms | 10.1007/978-1-4614-3455-9_8 |
2012-01-01 | Two psychophysical experiments are conducted to identify masking effects for the perception of damping. The results indicate that the just noticeable difference for damping increases with the magnitude of additional masking stimuli. This is the case for environments consisting of a damping/stiffness and environments co... | Masking Effects for Damping JND | 10.1007/978-3-642-31404-9_25 |
2012-01-01 | We investigate the death of entanglement and the purity loss of a two qubits–field system in the dispersive regime with a reservoir. For an alternative entanglement measure, we calculate the negativity of the eigenvalues of a partially transposed density matrix and compare it with the mutual entropy. A new measure rela... | Death of entanglement and purity in a two qubits–field system induced by phase damping | 10.1007/s10946-012-9256-0 |
2012-01-01 | In China, the construction of passenger dedicated line is in progress on a large scale. As the important infrastructure of passenger dedicated line, the fastener damping of ballastless turnout influences the vibration and noise of the track. In order to study the mutative fastener damping’s impact on the vibration and ... | The Reasonable Fastener Damping of Ballastless Turnout’s Vibration Decrease and Noise Reduction of 350 km/h Passenger Dedicated Line | 10.1007/978-3-642-27960-7_3 |
2012-01-01 | Any mechanical system possesses its own vibrating characteristics from which functioning can be understood and foreseen. Modal parameters such as natural frequencies and damping ratios are the main examples. This paper presents homemade numerical analyzer for characterizing them. The procedure is based on complex Morle... | Numerical Tool for Extraction of Modal Parameters Based on Continuous Wavelet Transform | 10.1007/978-3-642-28768-8_37 |
2012-01-01 | Long-span bridges can undergo vibrations during both construction and service phases, due to their flexibility and lightness. Moreover, they can be sensitive to environmental dynamic actions. The internal damping of this kind of structures is moderate, therefore vibration damping is frequently obtained by using dedicat... | Some Applications of Passive and Semi-active Control Devices for Harmonic Vibrations Damping in Cable-Stayed Bridges | 10.1007/978-3-642-24638-8_33 |
2012-01-01 | This chapter will briefly review some of the existing applications of model predictive control for vibration attenuation or its closely related fields. The application of model predictive control as a vibration reduction strategy is not common, and there are only a handful of available publications related to this fiel... | Applications of Model Predictive Vibration Control | 10.1007/978-1-4471-2333-0_9 |
2012-01-01 | The Distributed Tuned Mass Damper system, which is defined as the multiple Tuned Mass Damper design based on one specific vibration mode of the main structure, is investigated in this study. As those for single TMD design cases, the challenge work in this area is to attain the best vibration suppression performance thr... | A Novel Distributed Tuned Mass Damper Design Approach | 10.1007/978-3-642-33503-7_27 |
2012-01-01 | The magneto-rheological (MR) damper has been widely explored in the study of vibration suppression for vehicle suspension and constructional systems, etc. Aiming at semi-active controllable hysteretic nonlinear property of the MR damper depending on direct magnetic field, the generation mechanism of conducted and radia... | Modeling of Electromagnetic Interference Noise Mechanism for Magneto-Rheological Damper | 10.1007/978-3-642-33515-0_16 |
2012-01-01 | The geometric telegrapher’s process has been proposed in 2002 as a model to describe the dynamics of the price of risky assets. In this contribution we consider a related stochastic process, whose trajectories have two alternating slopes, for which the random times between consecutive slope changes have exponential dis... | On the damped geometric telegrapher’s process | 10.1007/978-88-470-2342-0_21 |
2012-01-01 | Although major improvements have been made in the field of hybrid simulation, the numerical models used in the tests are fairly simple, reaching only an order of ten Dynamic Degrees of Freedom (DDOF). However, the presence of large computational facilities along with the implementation of a Platform for Geographically ... | Use of Large Numerical Models and High Performance Computers in Geographically Distributed Seismic Tests | 10.1007/978-94-007-1977-4_11 |
2012-01-01 | The aim of this chapter is to emphasize the interest of the LPV methodology for suspension modeling and control. Indeed, the main features of a semi-active automotive suspensions are: The damper can only dissipate energy. The damper has a nonlinear behavior which is important to account for in the control design step. ... | LPV Modeling and Control of Semi-active Dampers in Automotive Systems | 10.1007/978-1-4614-1833-7_15 |
2012-01-01 | In this Chapter the control and exploitation of nonlinearity are considered when applied to so called ‘smart structures’. Here we consider how active control can be applied to structures particularly in the presence of nonlinearity. We also consider how snap-through structures can potentially be exploited as hinges in ... | Control and exploitation of nonlinearity in smart structures | 10.1007/978-3-7091-1187-1_6 |
2012-01-01 | Magneto- Rheological (MR) damper is a new generation of dampers, filled up with a MR fluid. This fluid, when exposed to a magnetic field, will transform regularly from a slipper linear viscous fluid to a semi rigid state. In this article, semi-active control of structures equipped with MR damper is studied. For this pu... | Semi-active Control of Structure Vibrations with MR Damper Using Fuzzy Control System (FLC) and Optimization through Genetic Algorithm (GA) | 10.1007/978-3-642-25541-0_74 |
2012-01-01 | CindyScript offers a wide range of very versatile functions for the generation of audio output. These audio functions cover the generation of music (via a built-in synthesizer), as well as the generation of algorithmically generated audio samples (how, for instance, does a function sound?). They can be used to serve ma... | Music Support: Syntherella | 10.1007/978-3-540-34926-6_14 |
2012-01-01 | The vibration analysis of n -dof systems is the subject of this chapter, the focus being undamped systems, while only outlining the analysis of damped systems in Sect. 6.6. The analysis of n -dof undamped systems parallels that of their two-dof counterparts, the only difference being that the calculations that were pos... | Vibration Analysis of n-dof Systems | 10.1007/978-1-4419-1027-1_6 |
2012-01-01 | Since the initiation of 200 km·h^− 1 High Speed Railway (HSR) in the Japanese Shinkansen, the lateral stability solutions of High Speed Rolling Stocks (HSRS) have been developed and improved through the theoretical and practical courses, especially the novel theory of anti-hunting wide-band absorption is presented and ... | Theoretical and Practical Study on High-Speed Bogie Stability Margin Regulations | 10.1007/978-3-642-27960-7_10 |
2012-01-01 | Magneto-rheological damper is a nonlinear system. In this case study, system has been identified using Neural Network tool. Optimization between number of neurons in the hidden layer and number of epochs has been achieved and discussed by using multilayer perceptron Neural Network. | Nonlinear System Identification Using Neural Network | 10.1007/978-3-642-28962-0_13 |
2011-12-01 | The aim of the present study was to find and describe the relationship between damping properties and both the number of layers and the fiber orientation in wood-veneer-composite specimens. The testing apparatus was a simple torsional pendulum in which the frequencies of the resulting free vibrations were maintained be... | Damping and layer configuration in wood veneer composites | 10.1007/s10086-011-1206-x |
2011-12-01 | This work is concerned with a system of two viscoelastic wave equations with nonlinear damping and source terms acting in both equations. Under some restrictions on the nonlinearity of the damping and the source terms, we prove that, for certain class of relaxation functions and for some restrictions on the initial dat... | General decay of solutions of a nonlinear system of viscoelastic wave equations | 10.1007/s00030-011-0112-7 |
2011-12-01 | This paper focuses on the dynamic stiffness and overall equivalent damping of an air spring connected to an orifice and an auxiliary reservoir, with respect to the displacement excitation frequency, orifice area, and auxiliary reservoir volume. A theoretical model of this air spring with its auxiliary reservoir is deri... | Model development and experimental research on an air spring with auxiliary reservoir | 10.1007/s12239-011-0096-7 |
2011-12-01 | Dispersion relations for a coupled thermoelasticity problem including a hyperbolic heat conduction equation are derived, and their asymptotic analysis is performed. Dependences of the wave number and characteristics of the vibration damping rate on frequency are obtained and compared with similar diagrams in the classi... | Analysis of dispersion relations of a coupled thermoelasticity problem with regard to heat flux relaxation | 10.1134/S0021894411060125 |
2011-12-01 | The Reynolds equation coupled with an effective viscosity model is often employed to predict squeeze-film damping of plate resonators in a low vacuum. Due to the lack of a sound theoretical foundation, a study is carried out to evaluate the performance of such an approach in the free-molecule regime and results are pre... | On the modified Reynolds equation model for the prediction of squeeze-film gas damping in a low vacuum | 10.1007/s10404-011-0840-3 |
2011-12-01 | The scientific basis for the design of self-lubricating self-aligning sliding bearings with reciprocal motion is presented for the first time. The bearings are used as seismic dampers for bridges, industrial and civil buildings, and oil and gas offshore structures; they are superior to known bearings in carrying and da... | Sliding bearings used as seismic dampers with composite self-lubricating materials | 10.3103/S1068366611060043 |
2011-12-01 | Considering the direct and converse piezoelectric effect, expressions of piezoelectric membrane internal forces in the piezoelectric constrained layer were given. The control equations of the piezoelectric constrained layer and host plate were obtained in according with the thin plate theory. Based on the layer wised p... | Dynamic characteristics analysis of active constrained layer damping plate with various boundary conditions | 10.1007/s11465-011-0240-0 |
2011-12-01 | This two-part paper deals with impact interaction of ships with one-sided ice barrier during roll dynamics. The first part presents analytical and numerical studies for the case of inelastic impact. An analytical model of a ship roll motion interacting with ice is developed based on Zhuravlev and Ivanov non-smooth coor... | Inelastic impact dynamics of ships with one-sided barriers. Part I: analytical and numerical investigations | 10.1007/s11071-010-9937-6 |
2011-12-01 | In this study, we consider the vibration mitigation problem for a structural system using a magneto-rheological (MR) damper. For this purpose, through the use of Lyapunov-based design techniques, a nonlinear adaptive controller which can compensate the parametric uncertainties related to both the structural system and ... | A new semiactive nonlinear adaptive controller for structures using MR damper: Design and experimental validation | 10.1007/s11071-011-9946-0 |
2011-12-01 | If a discrete elastic system with frictional interfaces is subjected to periodic loading, the eventual steady-state response may depend on the initial condition or an initial transient phase of the loading history. In cases where shakedown is possible, it is known that it will occur for all initial conditions if there ... | Frictional systems subjected to oscillating loads | 10.1007/s12356-011-0017-5 |
2011-12-01 | The active damping of the resonant vibrations of a flexible cylindrical panel with rectangular planform and clamped edges is considered. The damping is done with distributed piezoelectric sensors and actuators. It is shown that the amplitude of the resonant vibrations can be substantially decreased by choosing the appr... | Active damping of the resonant vibrations of a flexible cylindrical panel with sensors and actuators | 10.1007/s10778-011-0497-3 |
2011-12-01 | The main aim of this paper is to investigate the effect of various constrained layers (viscoelastic layer (VEL), electro-rheological fluid (ERF), and magneto-rheological fluid (MRF)) over natural frequency and the damping loss factor with two different fiber orientations (0° and 90°) for a Graphite/Epoxy (GR/E) composi... | Effect of constrained layers on vibrational characteristics of a composite sandwich system—A finite element based critical investigation | 10.1007/s10999-011-9166-2 |
2011-12-01 | By extending the numerical technique suggested by the author for the dynamic contact problem having a very stiff spring on the contact point, it is shown that the dynamic contact problem having a very stiff damper as well as a spring on the contact point can be time integrated without instability by imposing the time-d... | A short note for numerical analysis of dynamic contact considering impact and a very stiff spring-damper constraint on the contact point | 10.1007/s11044-011-9257-8 |
2011-11-01 | Numerical simulations of spontaneous shear rupture on a planar fault using a slip-weakening model in a three-dimensional uniform elastic medium were conducted using a parallel FE code, GeoFEM, which was originally developed for the solid-Earth simulations on the Earth Simulator. The aim was to evaluate the accuracy and... | Assessment of the finite element solutions for 3D spontaneous rupture using GeoFEM | 10.5047/eps.2011.06.041 |
2011-11-01 | Procedural questions related to the construction of mathematical models that establish a quantitative relationship between certain characteristics of the temperature field and the indicator of damping of the pulse electromagnetic field in a layer of the annual temperature fluctuations of built-up areas of the cryolithi... | Calculation of the temperature of frozen ground on the basis of mathematical models of the temperature dependence of ground penetrating radar signals | 10.1007/s11018-011-9829-2 |
2011-10-01 | Internal vibration of the valve spring is a critical factor in determining the dynamic characteristics of high-speed valve train systems. Because precise prediction of the spring surge amplitude is a difficult problem, especially for nonlinear variable-pitch springs, the development stage requires a process of trial an... | Estimation of valve spring surge amplitude using the variable natural frequency and the damping ratio | 10.1007/s12239-011-0073-1 |
2011-10-01 | Damping constitutes a major source of uncertainty in dynamic analysis and an open issue to experimental and analytical research. After a thorough review of the current views and approaches existing in literature on damping and its appropriate modelling, this paper focuses on the implications of the available modelling ... | Modelling of elastic damping in nonlinear time-history analyses of cantilever RC walls | 10.1007/s10518-011-9286-y |
2011-10-01 | The purpose of this paper is to establish strong lower energy estimates for strong solutions of nonlinearly damped Timoshenko beams, Petrowsky equations in two and three dimensions and wave-like equations for bounded one-dimensional domains or annulus domains in two or three dimensions. We also establish weak lower vel... | Strong lower energy estimates for nonlinearly damped Timoshenko beams and Petrowsky equations | 10.1007/s00030-011-0108-3 |
2011-10-01 | An experimental apparatus designed specifically for fretting experiments on mechanical lap joints is presented. A piezoactuator is used to impose fretting motion, and a tri-axial load cell is used to measure tangential force as well as possible misalignment forces. A laser nanosensor is employed to measure the relative... | Development of a Lap Joint Fretting Apparatus | 10.1007/s11340-010-9458-8 |
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