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2015-03-01 | In the present paper, a linear model for multi-degree-of-freedom systems with rate-independent damping is proposed to the purposes of dynamic response prediction and identification. A viscoelastic model with memory, equivalent to the ideal hysteretic model as for the energy dissipation properties, but causal and physic... | Modelling and identification of structures with rate-independent linear damping | 10.1007/s11012-014-0046-3 |
2015-03-01 | The seismic response of single-storey, one-way asymmetric building with passive and semi-active variable stiffness dampers is investigated. The governing equations of motion are derived based on the mathematical model of asymmetric building. The seismic response of the system is obtained by numerically solving the equa... | Seismic response of torsionally coupled building with passive and semi-active stiffness dampers | 10.1007/s40091-015-0080-y |
2015-03-01 | Timber frame buildings are well known as an efficient seismic resistant structure and they are used worldwide. Moreover, they have been specifically adopted in codes and regulations during the XVIII and XIX centuries in the Mediterranean area. These structures generally consist of exterior masonry walls with timber ele... | Seismic behaviour of traditional timber frame walls: experimental results on unreinforced walls | 10.1007/s10518-014-9650-9 |
2015-03-01 | A single-mass mechanical system with harmonically changing rigidity at the parametric disturbance frequency, which approximately coincides with the double frequency of the natural oscillations of the system and contains an arbitrary nonlinear symmetrical force, is considered. Main parametric resonance occurs when the a... | The effect of the strong suppression of parametric oscillations at a low intensity of vibration damping | 10.3103/S1052618815020065 |
2015-03-01 | The geometric nonlinearity of off-diagonal bracing system (ODBS) could be a complementary system to covering and extending the nonlinearity of reinforced concrete material. Finite element modeling is performed for flexural frame, x-braced frame and the ODBS braced frame system at the initial phase. Then the different m... | Finite Element Modeling and Nonlinear Analysis for Seismic Assessment of Off-Diagonal Steel Braced RC Frame | 10.1007/s40069-014-0089-9 |
2015-03-01 | Permanent magnet (PM) synchronous motors with starting cage, already developed in the 1960s for variable-speed textile drives, become increasingly important as energy-efficient PM line-start motors. Differing from the standard design with integrated magnets, a rotor design with surface-mounted magnets is presented. In ... | Running up and pulling into step of PM line-start motors with surface-mounted magnets | 10.1007/s00202-014-0308-z |
2015-03-01 | We present a new and algebraic approach to the optimal damping of servo axes during commissioning. The approach is based on control of root loci of the denominator of the transfer function using algebraic elimination. The results are either explicit formulas for simple systems or descriptions of the optima via roots of... | Commissioning rules for optimal velocity controller damping of servo axes using elimination methods | 10.1007/s11081-014-9272-8 |
2015-03-01 | A Fourier transform-based method has been developed for calculating the response of a railway track as an infinitely long uniform periodic structure subject to moving or stationary harmonic loads. The track may become a non-uniform periodic structure by, for example, rail dampers which are installed between sleepers to... | Generalization of the Fourier transform-based method for calculating the response of a periodic railway track subject to a moving harmonic load | 10.1007/s40534-015-0066-2 |
2015-03-01 | This paper presents design, implementation and experimental results of active vibration control of a truss structure using a pair of piezoelectric ceramic stack actuators. To reduce the vibrations caused by an impulse force, two active strut members are installed along a vertical of the base bay of the truss. The activ... | Active modal damping control of a smart truss structure using a self-organizing fuzzy controller | 10.1007/s40430-014-0174-7 |
2015-03-01 | In the last years, different active methods and devices have been proposed to suppress chatter vibrations. Among active control devices, inertial actuators have demonstrated their good behaviour in several studies. However, their dimensioning and tuning are not clear issues. This work proposes the utilization of a nove... | Coupled model for simulating active inertial actuators in milling processes | 10.1007/s00170-014-6469-0 |
2015-03-01 | Active vibration control based on state feedback using H _∞ criterion for two typical types of engineering equipment (machinery and sensitive equipment) is demonstrated here. Semi-active vibration control was implemented using a magnetorheological (MR) damper, which was guided by optimal output using the active method.... | Semi-active Vibration Control Using a Magneto Rheological (MR) Damper with Particle Swarm Optimization | 10.1007/s13369-015-1574-4 |
2015-03-01 | In this paper, vibration isolator of single degree of freedom systems having a nonlinear viscous damping is studied under force excitation. Stability of the steady state periodic response has been discussed. The influence of damping coefficients on the force transmissibility and displacement transmissibility is investi... | Analysis of the effects of nonlinear viscous damping on vibration isolator | 10.1007/s11071-014-1814-2 |
2015-03-01 | The issue of vibration damping occurs in many mechanical problems in the operation of various devices, in the automotive industry engineering, aerospace. In the case where damping by selection of the masses and dimensions is not possible due to various reasons or for other reasons it was abandoned, vibration dampers ar... | Description of phenomena vibration in hyperdeform polymers materials | 10.1007/s40435-014-0069-6 |
2015-03-01 | This paper is concerned with vibration mitigation of a quarter car model using a semi-active magnetorheological (MR) damper. A nonlinear adaptive controller is proposed for vibration attenuation of the quarter car suspension system equipped with MR damper. Proposed adaptive controller can also compensate the uncertaint... | Nonlinear adaptive control of semi-active MR damper suspension with uncertainties in model parameters | 10.1007/s11071-014-1844-9 |
2015-03-01 | We present an idealised model of the tidal response in a main channel with multiple secondary basins, co-oscillating with an adjacent sea. The sea is represented as a semi-infinite strip of finite width, anywhere between the limits of a channel extension (narrow) and a half-plane (wide). The sea geometry controls the e... | Resonance properties of tidal channels with multiple retention basins: role of adjacent sea | 10.1007/s10236-015-0809-y |
2015-03-01 | Formulas for calculating the dimensions of a dynamic low-frequency vibration damper are derived. The damper is designed as a circularly curved thin-walled plate. Bench tests demonstrated that the damper effectively reduces the amplitude of vibrations of the bearing of a high-power turbine-generator set in two direction... | A Dynamic Low-Frequency Vibration Damper for Bearings of Turbine-Generator Sets | 10.1007/s10749-015-0560-z |
2015-03-01 | Influence of foundation conditions and typology in above-ground full containment liquefied natural gas (LNG) storage tank design makes it necessary to evaluate its structural response due to dynamic actions. Typical above-ground full containment LNG storage tanks are constituted of an outer tank made of reinforced and ... | Finite element methodology for the evaluation of soil damping in LNG tanks supported on homogeneous elastic halfspace | 10.1007/s10518-014-9655-4 |
2015-03-01 | Passive control devices are often added to slender and flexible systems in order to increase their structural safety. Several types of devices have been proposed in order to reduce the dynamic responses of different kind of structural systems. Among them, the tuned liquid column damper (TLCD) proved to be very effectiv... | Optimal tuning of tuned liquid column damper systems in random vibration by means of an approximate formulation | 10.1007/s11012-014-0051-6 |
2015-03-01 | Hydrostatic guideways are used as an alternative to contact bearings due to high stiffness and high damping in heavy machine tools. To improve the dynamic characteristic of bearing structure, the dynamic modeling of the hydrostatic guidway should be accurately known. This paper presents a “mass-spring-Maxwell” model co... | Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect | 10.1007/s11465-015-0331-4 |
2015-02-27 | In this work, we consider coupled nonlinear wave equations with degenerate damping and source terms. We will show the blow up of solutions in finite time with positive initial energy. This improves earlier results in the literature. | Blow up of positive initial-energy solutions for coupled nonlinear wave equations with degenerate damping and source terms | 10.1186/s13661-015-0306-8 |
2015-02-11 | In this paper, we consider the initial boundary value problem of the double dispersive-dissipative wave equation with nonlinear damping and source terms. By the combination of the Galerkin method and the monotonicity-compactness method, the existence of global solutions is obtained with the least amount of a priori est... | Global existence and asymptotic behavior of solutions for the double dispersive-dissipative wave equation with nonlinear damping and source terms | 10.1186/s13661-015-0288-6 |
2015-02-01 | The earthquake-resistant design of prefabricated buildings is currently the focus of attention, especially for industrial buildings that require a high level of seismic protection. The standard design approach, based on ductility requirements, may succeed in preventing building collapse during a severe earthquake, but ... | Roof Isolation with Tuned Mass-based Systems and Application to a Prefabricated Building | 10.1007/s13369-014-1537-1 |
2015-02-01 | We consider the attenuation of the oscillation of a flat spring due to the action of a granular damper. The efficiency of the damper is quantified by evaluating the position of the oscillator as a function of time using a Hall effect based position sensor. Performing experiments for a large abundance of parameters unde... | Probing the validity of an effective-one-particle description of granular dampers in microgravity | 10.1007/s10035-014-0539-8 |
2015-02-01 | In this paper, we consider the $$n$$ n -dimensional ( $$n\ge 2$$ n ≥ 2 ) damped models of incompressible fluid mechanics in Besov spaces and establish the global (in time) regularity of classical solutions provided that the initial data are suitable small. | Global Smooth Solutions to the n-Dimensional Damped Models of Incompressible Fluid Mechanics with Small Initial Datum | 10.1007/s00332-014-9224-7 |
2015-02-01 | In this study, the nonlinear, Hertz–Mindlin contact model and clumped particles were used in the discrete element method simulations of cyclic shear tests to obtain the shear modulus G and damping ratio D at a wide range of strain levels. The simulated G and D , which demonstrated similar behavior as observed by the ex... | DEM simulations of shear modulus and damping ratio of sand with emphasis on the effects of particle number, particle shape, and aging | 10.1007/s11440-014-0331-2 |
2015-02-01 | In this paper we consider an n -dimensional thermoelastic system with viscoelastic damping. We establish an explicit and general decay rate result without imposing restrictive assumptions on the behavior of the relaxation function at infinity. Our result allows a larger class of relaxation functions and generalizes pre... | Energy decay in thermoelasticity with viscoelastic damping of general type | 10.1007/s10114-015-2687-0 |
2015-02-01 | This paper is concerned with the asymptotic behavior of the solution for quasilinear hyperbolic equations with nonlinear damping. The main novelty in this paper is that we obtain the L ^ p (2 ≤ p ≤ +∞) convergence rates of the solution to the quasilinear hyperbolic equations, and we need none of the additional technic... |
L
^
p
-convergence rates to nonlinear diffusion waves for quasilinear equations with nonlinear damping | 10.1007/s00033-013-0392-3 |
2015-02-01 | Shear step strain experiments with various strain amplitudes have been performed on poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA) melts using both stress-controlled and strain-controlled rheometers. Firstly, the onset of the rheological nonlinearity, i.e., nonlinear stress damping behavior, occu... | Experimental considerations on the step shear strain in polymer melts: sources of error and windows of confidence | 10.1007/s00397-014-0814-y |
2015-02-01 | This paper is an extended study on the model of the hysteretic dynamics of magnetorheological dampers based on a phenomenological phase transition theory (Wang and Kamath in Smart Mater. Struct. 15(6):1725–1733, 2006 ). It is demonstrated that, by appropriately choosing model parameters, the frequency dependence of the... | An investigation on the field strength and loading rate dependences of the hysteretic dynamics of magnetorheological dampers | 10.1007/s11043-014-9251-7 |
2015-01-13 | In this article, we study forced oscillatory properties of solutions to nonlinear fractional differential equations with a damping term. Based on the properties of the Riemann-Liouville fractional derivative, we establish a sufficient condition for oscillation of all solutions. | Forced oscillation of nonlinear fractional differential equations with damping term | 10.1186/s13662-014-0331-4 |
2015-01-10 | Based on a variational approach, we prove that a second-order singular damped differential equation has at least one periodic solution when some reasonable assumptions are satisfied. | Periodic solutions for a singular damped differential equation | 10.1186/s13661-014-0269-1 |
2015-01-01 | We investigated the damping mechanism of a granular material damping system applied to vibration reduction in structures that have a small vibration displacement. We devised a computational model of the movement of the primary system and the individual granules and obtained those motions by numerical simulation. Based ... | Numerical Simulation of a Granular Material Damper | 10.1007/978-3-319-09411-3_55 |
2015-01-01 | The contents of this chapter focus on modelling the control valves in flow-mode MR dampers. The authors handle several constitutive models of non-Newtonian fluid models, and obtain equations governing their behaviour in planar flow. Special attention in given to the development of a non-dimensional modelling approach i... | Modelling of Control Valves | 10.1007/978-3-319-13233-4_4 |
2015-01-01 | In an earlier paper, authors have investigated the static and dynamic stability of cracked concrete flanged conservative beam-columns. The cantilever column with a lumped mass at its free end is subjected to an axial compressive force and a lateral force. Two critical values each of the axial and lateral loads are defi... | Stability of Highly Damped Concrete Beam-Columns | 10.1007/978-81-322-2187-6_179 |
2015-01-01 | The stability of semiconductor laser operation plays a crucial role in almost every possible application of these devices (Erneux, Glorieux, Laser dynamics, Cambridge University Press, UK, 2010) [ 1 ], (Lüdge, Nonlinear laser dynamics—from quantum dots to cryptography, Wiley, Weinheim, 2012) [ 2 ], (Chow, Jahnke, Prog ... | Quantum-Dot Laser Dynamics | 10.1007/978-3-319-25805-8_3 |
2015-01-01 | The consideration of Rayleigh damping coefficients of α and β are an important aspect to determine damping matric in dynamic analysis. In this paper, finite element modal analysis is used on square natural damping rubber plate with various boundary conditions to determine its dynamic properties and damping coefficients... | Determination of Rayleigh Damping Coefficient for Natural Damping Rubber Plate Using Finite Element Modal Analysis | 10.1007/978-981-287-290-6_62 |
2015-01-01 | In this chapter we discuss how to continue NLS solutions beyond the singularity. | Continuations Beyond the Singularity | 10.1007/978-3-319-12748-4_38 |
2015-01-01 | Series compensation of long transmission lines is an economic solution to the problem of enhancing power transfer and improving system stability. However, series compensated transmission lines connected to the turbo generator can result in Subsynchronous Resonance (SSR) leading to undamped Subsynchronous Oscillations (... | Analysis and Damping of Subsynchronous Oscillations Using STATCOM | 10.1007/978-981-287-281-4_17 |
2015-01-01 | Rotor vibrations in electrical machines depend on structural damping and stiffness properties of the laminated cores. Structural damping determines torsional and transversal vibration amplitudes at resonances. Therefore, it is very important to know the structural damping and stiffness of the laminated cores to carry o... | Experimental Investigation of Structural Damping of Laminated Stacks of Electrical Machine Rotors | 10.1007/978-3-319-06590-8_50 |
2015-01-01 | Large photovoltaic power generation facilities are installing in the world. These large power generation are required to contribute actively to ac power system operation. This paper presents basic study results for dynamic stability improvement by large photovoltaic power generation. | Basic Study on Contribution to Dynamic Stability by Large Photovoltaic Power Generation | 10.1007/978-3-319-15765-8_20 |
2015-01-01 | The generalized damping based power flow mode theory [ 1 ] reveals natural power flow behaviours of a dynamic system based on the inherent characteristics of the system’s damping distribution, which provides insight into energy dissipation mechanisms of the dynamic system. In this paper, a new Power Flow Mode dynamic T... | Novel Approach for Structural Dynamic Topology Optimizations Based on Power Flow Mode Theory | 10.1007/978-3-319-09918-7_94 |
2015-01-01 | Damping plays an important role in bolted joints of assembled structures due to their significant capacity to dissipate energy. The underlying mechanisms of these dissipative phenomena are generally poorly understood and result from contact and friction effects within the joint interfaces. In order to provide useful vi... | Estimation of Modal Damping for Structures with Localized Dissipation | 10.1007/978-3-319-15048-2_17 |
2015-01-01 | A determination of the dynamic stiffness of the torque-speed curve of an electric drive is presented. Development of systems of control of an electric drive with elastic mechanics is described. The structure of a drive based on fuzzy-logic control and a state sensor is given. It is shown that the best damping of elasti... | Developing systems of control of electric drives with elastic mechanics | 10.3103/S1068371215010058 |
2015-01-01 | Artificial Neuro Fuzzy Inference System (ANFIS) is applied to design static synchronous series compensator based damping controller for the improvement of small signal stability. The proposed controller is implemented in the single machine system. The generated database from conventional static synchronous series compe... | Design of ANFIS Controller for Power System Stability Enhancement Using FACTS Device | 10.1007/978-81-322-2119-7_113 |
2015-01-01 | In the paper comparative rotor-dynamic analyses are carried out for various rotor-shaft systems supported on the classical journal-, rolling element- and on the passive magnetic bearings. The investigations are performed by means of the advanced 3D finite element model of the electrodynamic passive magnetic bearing and... | Dynamic Analysis of the High-Speed Flexible Rotors Supported on the Electrodynamic Passive Magnetic Bearings | 10.1007/978-3-319-06590-8_122 |
2015-01-01 | In order to make a bridge between the mathematical theory and the different applications of differential equations in real life, we begin by giving simple applications of differential equations. An object of mass m is released from a certain height h above the ground and falls under the force of gravity . We want to wr... | Modelling and Definitions | 10.1007/978-3-319-25735-8_1 |
2015-01-01 | Tuned liquid column gas damper (TLCGD) show excellent vibration absorbing capabilities appropriate for applications in wind- and earthquake engineering. However, in the early regime of strong motion seismic excitation or to counteract strong wind gusts the performance of the passive device can be increased substantiall... | Active Tuned Liquid Column Gas Damper in Structural Control | 10.1007/978-3-319-15248-6_47 |
2015-01-01 | Electrodynamic actuators and electromagnetic dampers (EMD) are used extensively in mechanical systems. They utilise the electromagnetic induction concept to generate eddy current and Lorentz forces for providing vibration suppression forces. In this research, these principles will be developed for vibration serviceabil... | Analysis of H
_
∞
and H
_2 Optimal Design Scheme for an Electromagnetic Damper with Shunt Resonant Circuit
| 10.1007/978-3-319-15233-2_21 |
2015-01-01 | In a composite lathe cutter, the influence of the handle design on the rigidity, temperature propagation, and damping of vibrations in cutting is analyzed. Metal cutters with horizontal holes in a checkerboard pattern and without such holes are considered. Software based on the finite-element method is used in the calc... | Influence of the handle design on a composite lathe cutter | 10.3103/S1068798X15010220 |
2015-01-01 | Damping of the oscillating cantilever in dynamic atomic force microscopy contains valuable information about the local vibrational structure and elastic compliance of the substrate. We review Damping Force Spectroscopy which has successfully visualized atomically-resolved damping in supramolecular assemblies, capable o... | Revealing Subsurface Vibrational Modes by Atomic-Resolution Damping Force Spectroscopy | 10.1007/978-3-319-15588-3_8 |
2015-01-01 | In this paper an elasto-dynamic model of a defective sphere bearing is presented. This two-dimensional model can simulate local faults on the bearing races and rolling elements, and it is based on the non-linear Hertzian contact deformation of the rolling elements. In the model the outer race is supposed to be fixed, a... | Non-linear Elasto-dynamic Model of Faulty Rolling Elements Bearing | 10.1007/978-3-319-06590-8_35 |
2015-01-01 | This core chapter concerns the convergence problem in finite dimensions. We recall that even gradient systems in two dimensions may be divergent, and we show that this phenomenon can happen even for potentials which are almost as smooth as analytic functions. Analyticity, through the Łojasiewicz gradient produces conve... | The Convergence Problem in Finite Dimensions | 10.1007/978-3-319-23407-6_10 |
2015-01-01 | The flight mechanics is an important ingredient in vehicle and subsystem design, its performance evaluation and its validation. It deals with forces and moments acting on bodies and the response of the bodies to the applied forces and moments. Typical applications are trajectory design, optimum payload estimation, navi... | Flight Mechanics | 10.1007/978-81-322-2532-4_8 |
2015-01-01 | Many of the modern slender and flexible structures are highly susceptible to wind-and earthquake-induced vibrations, which may result in damage to these structures. Of late tuned liquid column dampers (TLCD) has drawn significant attention of researchers. In TLCD, the motion of liquid column in a U-tube container count... | Comparison of Performance of Different Tuned Liquid Column Dampers (TLCDs) | 10.1007/978-81-322-2193-7_98 |
2015-01-01 | The high complexity and nonlinearity of power systems, together with their almost continuously time-varying nature, have presented a big challenge for control engineers, for decades. The disadvantages of the linear controllers/models, such as being dependent on the operating condition, sensibility to the disturbance su... | Transient Stability Enhancement of Power Systems Using Observer-Based Sliding Mode Control | 10.1007/978-3-319-11173-5_16 |
2015-01-01 | The Hamiltonian formalism developed by Arnowitt, Deser, and Misner (ADM) is used to derive and discuss the higher order post-Newtonian dynamics and motion of compact binary systems in general relativity including proper rotation of the components. Various explicit analytic Hamiltonians will be presented for the conserv... | Higher Order Post-Newtonian Dynamics of Compact Binary Systems in Hamiltonian Form | 10.1007/978-3-319-18335-0_18 |
2015-01-01 | Operational Modal Analysis (OMA) techniques provide in most cases reasonably accurate estimates of structural frequencies and mode shapes. In contrast though, they are known to often produce uncertain structural damping estimates, which is mainly due to inherent random and/or bias errors. In this paper a comparison is ... | Evaluation of Damping Using Frequency Domain Operational Modal Analysis Techniques | 10.1007/978-3-319-15248-6_37 |
2015-01-01 | This chapter provides a comprehensive mathematical description of the system given by a set of partial differential equations which embeds individual submodels corresponding to the different levels of the drillstring. The upper extremity is accurately described by appropriate top boundary conditions including the actua... | Comprehensive Modeling of a Vertical Oilwell Drilling System | 10.1007/978-3-319-15747-4_4 |
2015-01-01 | In this paper, we will show that under some smallness conditions, the planar diffusion wave $$\bar v\left( {\frac{{x_1 }} {{\sqrt {1 + t} }}} \right)$$ is stable for a quasilinear wave equation with nonlinear damping: v _ tt − Δ f ( v ) + v _ t + g ( v _ t ) = 0, x = ( x _1, x _2, ⋯, x _ n ) ∈ ℝ^ n , where $$\bar v\lef... | Stability of planar diffusion wave for the quasilinear wave equation with nonlinear damping | 10.1007/s10255-011-0100-z |
2015-01-01 | The main objective of this work is to contribute to a better understanding of the dynamic behavior of composite bars. In this work we propose an experimental modal analysis of Glass Fibers Reinforced Polymers (GFRP) bars. The objective is to characterize the damping properties of this material through vibration tests. ... | Damping Analysis of GFRP Bars | 10.1007/978-3-319-17527-0_60 |
2015-01-01 | Cantilevered piezoelectric devices under transverse base excitations, for generating usable power from ambient vibrations is a highly researched topic over the past decade. The commonly used rectangular shaped bimorphs require a large proof mass to drive sufficient power, and suffer from having a large stress concentra... | Shape Optimization of Cantilevered Devices for Piezoelectric Energy Harvesting | 10.1007/978-3-319-07004-9_3 |
2015-01-01 | We end up this book by considering different examples of systems with delay for which our abstract framework can be applied. | Systems with Delay | 10.1007/978-3-319-10900-8_5 |
2015-01-01 | This chapter overviews the theory of nonlinear dynamical systems. Next, it outlines differential geometry and Lie algebra-based control as the predecessor of differential flatness theory-based control. | Nonlinear Dynamical Systems and Global Linearizing Control Methods | 10.1007/978-3-319-16420-5_1 |
2015-01-01 | Many innovative, radical and respectable space debris remediation ideas are being proposed these days. Most of them are under constant development and many others have been taken up by space research organizations of different countries. But a good number of methods still suffer from technical and or financial imperfec... | Unconventional Methods for Space Debris Removal | 10.1007/978-3-319-15982-9_6 |
2015-01-01 | We investigated the specific features low-frequency (50–300 Hz) sound propagation in shallow-water areas to relatively small distances r ≈ 3 H –50 H from the sound source, where H is the waveguide depth. The bottoms of water areas were assumed to be fluid homogeneous gas-containing media. Situations were compared in wh... | Attenuation of sound in shallow-water areas with gas-saturated bottoms | 10.1134/S1063771015010029 |
2015-01-01 | The rotor of a 3-stage axial turbine designed for an ORC plant, supported by two axial/radial lubricated roller bearings, has some axial clearance in between the outer bearing ring shoulder in the casing to allow for thermal expansion. The rotor can move freely within the clearance before the bearings on both sides are... | Controlling Non-linear Axial Vibrations of a Turbine Rotor | 10.1007/978-3-319-06590-8_147 |
2015-01-01 | In this chapter, we first introduce the basic principles of seismic tomography and discuss the common features and differences between seismic tomography and the medical CT-scan. Considering the fact that many different kinds of tomographic studies have been made and a large number of tomography-related technical terms... | Methodology of Seismic Tomography | 10.1007/978-4-431-55360-1_2 |
2015-01-01 | The paper deals with optimization of dynamic characteristics of smart structures based on piezoelectric materials with external electric circuits comprising resistance, capacitance and inductance. The dynamic parameters to be optimized are resonance frequencies and damping properties. For numerical estimation of the dy... | Optimization of the Damping Properties of Electro-Viscoelastic Objects with External Electric Circuits | 10.1007/978-3-319-17118-0_4 |
2015-01-01 | A method of absolute calibration of electrodynamic seismic sensors by single-sensor displacement is theoretically justified. It is shown that the method can be implemented using simple mechanical devices and a recording system. The required mathematical processing of the step-test impact can also be carried out using o... | Absolute calibration of seismic sensors using a displacement jump: Theory and practice | 10.3103/S0747923915010053 |
2015-01-01 | This chapter describes the experimental work and numerical simulations performed for the purpose of monotube damper model verification. To validate the modelling scheme for the material contained in previous chapters, several monotube damper prototypes were subjected to a range of velocity, displacement and commanded c... | Experimental Verification of an MR Monotube Damper Model | 10.1007/978-3-319-13233-4_8 |
2015-01-01 | In this thesis, the dynamics of semiconductor quantum-dot optoelectronic devices has been investigated. The complex charge-carrier dynamics due to the coupling of localized electronic quantum-dot states and the surrounding continuum reservoir states has been found to crucially influence the dynamic response of the quan... | Summary and Outlook | 10.1007/978-3-319-25805-8_5 |
2015-01-01 | A contraction semi-group on a real Banach space is either made of operators of norm equal to 1 for all times, or exponentially decaying in norm. Exponential decay is established in relevant norms for the heat equation and the wave equation with dissipation in a bounded domain. | Uniformly Damped Linear Semi-groups | 10.1007/978-3-319-23407-6_4 |
2015-01-01 | This paper describes modeling and simulation of spur gear pair in Adams–View. Initially, virtual model of an ideal gear pair is created in Adams and variation of the dynamic force is obtained by considering the tooth mesh stiffness and mesh damping coefficient. The magnitude of force variation thus obtained is confirme... | Modeling and Dynamic Force Simulation for Detection of Profile Error in Spur Gear Pair | 10.1007/978-3-319-09918-7_97 |
2015-01-01 | The damping properties of materials, joints, and assembled structures can be modeled efficiently using fractional derivatives in the respective constitutive equations. The respective models describe the damping behavior accurately over broad ranges of time or frequency where only few material parameters are needed. The... | Implementation of Fractional Constitutive Equations into the Finite Element Method | 10.1007/978-3-319-06980-7_13 |
2015-01-01 | Turbine blades are critical components in thermal power plants and their design process usually includes experimental tests in order to tune or confirm numerical analyses. These tests are generally carried out on full-scale rotors having some blades instrumented with strain gauges and usually involve a run-up and/or a ... | Damping Estimation for Turbine Blades Under Non-stationary Rotation Speed | 10.1007/978-3-319-15048-2_14 |
2015-01-01 | Understanding the dynamic response of accelerometers is critical to interpreting data obtained in impulsive loading conditions. While this information is commonly provided by manufacturers, the estimated properties are typically obtained at levels below the full range of the sensor. Using high bandwidth operating data ... | Estimation of Amplitude-Dependent Resonance and Damping in MEMS Shock Accelerometers | 10.1007/978-3-319-15233-2_11 |
2015-01-01 | In the last couple of decades the use of energy dissipation devices for earthquake mitigation has gained much attention. Most research in that field, however, focused on frame buildings. This chapter is based on (Lavan, Earthq Eng Struct Dyn 41(12):1673–1692) and discusses the possibilities of using energy dissipation ... | On the Seismic Behaviour of Viscously Coupled Shear Walls | 10.1007/978-3-319-06394-2_13 |
2015-01-01 | This note gives a concise summary of results concerning the well-posedness and long-time behavior of (Reissner)–Mindlin–Timoshenko plate equations as presented in Pei et al. (Local and global well-posedness for semilinear Reissner–Mindlin–Timoshenko plate equations, 2013 and Global well-posedness and stability of semil... | Well-Posedness and Stability of a Mindlin–Timoshenko Plate Model with Damping and Sources | 10.1007/978-3-319-12577-0_36 |
2015-01-01 | The response of two adjacent single degree-of-freedom (SDOF) structures connected by nonlinear viscous damper under base excitation, modeled as stationary white-noise random process is investigated. Considering nonlinear force-deformation phenomenon of nonlinear viscous damper, the dynamic response of connected structu... | Dynamic Response of Adjacent Structures Coupled by Nonlinear Viscous Damper | 10.1007/978-81-322-2193-7_85 |
2015-01-01 | The attributes, relevant to earthquake resistant design, are described. The reader will get acquainted with properties of reinforced concrete and masonry units to the extent that they relate to cyclic loading. Other attributes that are described in detail are damping, ductility, mass, lateral stiffness and strength. Af... | Important Attributes for Seismic Design | 10.1007/978-81-322-2319-1_2 |
2015-01-01 | The opportunities to energize a broad range of devices by use of energy available almost anywhere and in many forms are almost unlimited. A major advantage of energy harvesting is the manufacture of small autonomous electronic devices with no need for power supply and maintenance. Shunt damping circuits, although unfav... | Integration of Thermal Energy Harvesting in Semi-Active Piezoelectric Shunt-Damping Systems | 10.1007/s11664-014-3194-2 |
2015-01-01 | A finite element model of a car front subframe has been calibrated against test data. Stepped-sine testing has been used to give frequency response function estimates on an ensemble of seemingly identical subframes. Therefore, the deviation between test data and simulation results can be compared in a meaningful way by... | Calibration and Validation of a Car Subframe Finite Element Model Using Frequency Responses | 10.1007/978-3-319-15251-6_2 |
2015-01-01 | This paper focuses on vibrations attenuation of an electromechanical system flexibly coupled with a baseplate by cylindrical helical springs and damped by an element that can work either in inertia or impact regime. The model is constructed with three degrees of freedom in the mechanical oscillating part, two translati... | On Dynamics of an Electromechanical System Supported by Cylindrical Helical Spring Damped by an Impact Damper | 10.1007/978-3-319-10759-2_19 |
2015-01-01 | The response of two adjacent single degree-of-freedom (SDOF) structures connected by viscous damper under base excitation, modeled as non-stationary random process is investigated. To study the effect of amplitude non-stationary characteristics of earthquake excitation, the ground motion is modeled as a uniformly modul... | Random Response Analysis of Adjacent Structures Connected by Viscous Damper | 10.1007/978-81-322-2193-7_88 |
2015-01-01 | Non-linear damped vibrations of a cylindrical shell subjected to the different conditions of the combinational internal resonance are investigated. Its viscous properties are described by Riemann-Liouville fractional derivative. The displacement functions are determined in terms of eigenfunctions of linear vibrations. ... | Analysis of Non-linear Vibrations of a Fractionally Damped Cylindrical Shell Under the Conditions of Combinational Internal Resonance | 10.1007/978-3-319-15765-8_3 |
2015-01-01 | Reduction of whirling vibration amplitudes in rotordynamic systems resulting from unbalance force during the passage through the critical speeds is very important for preventing propagation of fatigue cracks, excessive noise and instability problems. In this paper, numerical investigations of passive targeted energy tr... | Vibration reduction in unbalanced hollow rotor systems with nonlinear energy sinks | 10.1007/s11071-014-1684-7 |
2015-01-01 | One of the important advantages of IEPE accelerometers is their small noise permitting them to measure small vibration signals at frequency range from about 0.001 Hz to 20 kHz. Specifically, some modern ultra-low-noise IEPE accelerometers feature a noise floor (equivalent input noise acceleration spectral density) esti... | Fundamental Noise Limit of an IEPE Accelerometer | 10.1007/978-3-319-08078-9_6 |
2015-01-01 | Poor and devastating performance of the soft storey buildings during earthquakes always advocated against the construction of such buildings with soft ground storey. Increasing construction of multistoried buildings with soft ground story however indicates that the practical need of an open space to provide car parking... | Seismic Protection of Soft Storey Buildings Using Energy Dissipation Device | 10.1007/978-81-322-2193-7_102 |
2015-01-01 | This paper presents a numerical model of how a visco-elastic support affects the dynamical response of a 42 MW Kaplan turbine that is experiencing resonance problems. The supports are placed between the bearing bracket and the supporting concrete structure. Since the supports are nonlinear, the nodal displacements are ... | Modeling of Visco-elastic Supports for Hydropower Applications | 10.1007/978-3-319-06590-8_180 |
2015-01-01 | Depending on their types and sizes, MW-scale wind turbines are usually designed to be operational for wind speeds between 4 and 25 m/s. In order to reach this goal, most of the turbines utilize active pitch control mechanisms where the angle of the blade (pitch angle) is changed as a function of wind speed. Similarly, ... | Dynamic Stability Analysis of Wind Turbines Through In-Field Vibration Tests | 10.1007/978-3-319-17031-2_70 |
2015-01-01 | The clamping length of holder-tool often changes with the machining conditions and is the main factor affecting the stiffness and damping values of holder-tool interface. To avoid the need for repeating the measurements, the previous studies identify the joint stiffness-damping parameters based on genetic algorithm and... | A Simplified Method to Identify the Equivalent Joint Parameters of Holder-Tool Interface | 10.1007/978-3-319-22876-1_51 |
2015-01-01 | The destabilization effect of damping on a class of general dynamical systems is discussed. The phenomenon of jump in the critical value of the bifurcation parameter, in passing from undamped to damped system, is view in a new perspective, according to which no discontinuities manifest themselves. By using asymptotic a... | A paradigmatic minimal system to explain the Ziegler paradox | 10.1007/s00161-014-0363-8 |
2015-01-01 | Industrial structures are mainly assemblies with complex geometries and non-linear characteristics. Friction and joint preload added to fabrication imperfections lead to a substantial gap between numerical models and real structures. In order to develop accurate generic models, it is then necessary to quantify the beha... | Variability of a Bolted Assembly Through an Experimental Modal Analysis | 10.1007/978-3-319-15224-0_18 |
2015-01-01 | The nonlinear dynamics of a two-degree-of-freedom (2-DOFs) vibrating energy harvester (VEH) based on magnetic levitation is modeled and investigated. The equations of motion have been derived while taking into account the magnetic nonlinearity and the electro-magnetic damping. The associated linear eigenvalue problem h... | Nonlinear 2-DOFs Vibration Energy Harvester Based on Magnetic Levitation | 10.1007/978-3-319-15233-2_5 |
2015-01-01 | Peat soils impose special problems in Geotechnical Engineering design as well as Civil Engineering and constructions. Most of researchers conducted investigations on the dynamic loading of soft soils such as sand and clay, but only a few had discovered the behaviour of peat in terms of static and dynamic loadings. Henc... | The Characteristics of Pontian Peat Under Dynamic Loading | 10.1007/978-981-287-290-6_43 |
2015-01-01 | This paper investigates the influence of combined fast external excitation and internal parametric damping on the amplitude and the onset of the quasi-periodic galloping of a tower submitted to steady and unsteady wind flow. The study is carried out considering a lumped single degree of freedom model and the cases wher... | Quasi-Periodic Galloping of a Wind-Excited Tower Under External Forcing and Parametric Damping | 10.1007/978-3-319-19851-4_7 |
2015-01-01 | This study investigates the experimental validation of transverse flux linear motors (TFLMs) with permanent magnet excitation and the dynamic simulation of the developed TFLM created using the optimal design. Our research challenge is to use the developed direct drive TFLM to substitute the rack and pinion in a rotary ... | Development of thrust force 6 kN class transverse flux linear motor with synchronous control for direct drive applications | 10.1007/s12541-015-0025-1 |
2015-01-01 | The great twentieth century mathematician, John von Neumann, once said, “At a great distance from its empirical source, or after much abstract inbreeding, a mathematical subject is in danger of degeneration. Whenever this stage is reached the only remedy seems to me to be the rejuvenating return to the source: the rein... | Structural Dynamic Modeling: Tales of Sin and Redemption | 10.1007/978-3-319-15048-2_6 |
2015-01-01 | Tip timing blade vibration measuring systems have become nowadays common for monitoring blade vibrations, due to rather easy and non-intrusive installation of sensors. The data collected by the sensors must be heavily processed in order to get the vibration time histories of all blades at rated speed or during a run up... | Blade Vibration Measurements and Excitation Force Evaluation | 10.1007/978-3-319-06590-8_6 |
2015-01-01 | In the cardiovascular interventional operation, the surgeon steers the tip of a long-thin guidewire to reach the clinical targets while traveling through the inner of blood vessels, and performs a wide range of minimally invasive procedures. However, real-time simulating the physical deformation behaviours of guidewire... | Modeling and Simulation of Multi-frictional Interaction Between Guidewire and Vasculature | 10.1007/978-3-319-21963-9_48 |
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