publicationDate stringlengths 10 10 | abstract stringlengths 0 37.3k | title stringlengths 1 5.74k | doi stringlengths 11 47 ⌀ |
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2013-01-01 | A new encoding scheme is presented for a fuzzy-based nonlinear system identification methodology, using the subtractive Fuzzy C-Mean clustering and a modified version of non-dominated sorting genetic algorithm. This method is able to automatically select the best inputs as well as the structure of the fuzzy model such ... | A Multi-objective Subtractive FCM Based TSK Fuzzy System with Input Selection, and Its Application to Dynamic Inverse Modelling of MR Dampers | 10.1007/978-3-642-38658-9_20 |
2013-01-01 | Mag can be used not only as controllable damping devices but also to emulate a controllable positive or negative stiffness in combination with the dissipative force. However, the dissipative nature of MR dampers constrains the stiffness control. This work formulates the problem of combined stiffness and damping control... | Precise Stiffness Control with MR Dampers | 10.1007/978-1-4614-6555-3_8 |
2013-01-01 | A method for evaluating the economic efficiency of a semi-active Magneto-Rheological (MR) damper system for cable-stayed bridges under earthquake loadings is described and its evaluation results are investigated in this paper. The economic efficiency of semi-active MR damper system is addressed by introducing the conce... | Cost-effectiveness evaluation of an MR damper system based on a life-cycle cost concept | 10.1007/s12205-013-1244-6 |
2013-01-01 | This paper proposes a real-time trajectory generation algorithm for both arms of a humanoid robot. Since it is hard to find a closed form of inverse kinematics for each arm of seven degrees of freedom, the damped least-squares method is employed to obtain the inverse kinematics. The trajectory is generated by the minim... | Real-Time Trajectory Generation for Both Arms of a Humanoid Robot | 10.1007/978-3-642-37374-9_37 |
2012-12-13 | In this paper, we are concerned with a system of nonlinear viscoelastic wave equations with initial and Dirichlet boundary conditions in R n ( n = 1 , 2 , 3 ). Under suitable assumptions, we establish a general decay result by multiplier techniques, which extends some existing results for a single equation to the case ... | General decay for a system of nonlinear viscoelastic wave equations with weak damping | 10.1186/1687-2770-2012-146 |
2012-12-01 | This paper addresses the dynamic properties of automotive shock absorber modules. Analyzing an equivalent linear system, a set of characteristic dimensionless numbers are introduced in order to qualify the dynamic performance of the damper and the damper module. The dependency of these numbers on the main parameters of... | Dynamic properties of automotive damper modules | 10.1007/s00419-012-0627-3 |
2012-12-01 | We have investigated a DW motion driven by AC external field with a variation of damping parameter α in Landau–Lifshitz–Gilbert equation as well as a variation of an oscillating force frequency by means of a micromagnetic simulation. Straight ferromagnetic wires having a DW at the wire center is considered, where the D... | Micromagnetic Study of Forced Oscillation of Magnetic Domain Wall in Ferromagnetic Nanowires with Variation of Damping Constant | 10.1007/s10948-011-1268-4 |
2012-12-01 | Ferromagnetic resonance measurements were carried out for single crystalline Co_2MnAl thin films as a function of the angle between applied external magnetic field and normal of the film surface. In- and out-of-plane angular dependence of the resonance field and only out-of-plane angular dependence of the linewidth of ... | Magnetic Properties of Single Crystalline Co_2MnAl Heusler Alloy Thin Films | 10.1007/s10948-011-1238-x |
2012-12-01 | Polycrystalline quaternary Co_2MnAl_1− x Sn_ x films with x =0.25, 0.5, 0.75, 1 were prepared at room temperature using magnetron sputtering technique on SiO_2 substrates and post-annealed at various temperatures. We investigated the crystal structures, magnetic properties, and magnetic damping constants ( α ) of the p... | Gilbert Damping Constant of Quaternary Co_2MnAl_1−x
Sn_
x
Heusler Alloy Thin Films | 10.1007/s10948-011-1272-8 |
2012-12-01 | Radiation damping of surface plasmon oscillations in metallic nanoparticles is proportional to their volume. For relatively large particles, this canal dominates the other mechanisms of relaxation and becomes the main limiting factor for spectral sensitivity of nanoparticles. In this communication, we consider metallic... | Strong Suppression of Surface Plasmon Radiation Damping Rate in Noble Metal Nanoshells | 10.1007/s11468-012-9368-y |
2012-12-01 | A necessary and sufficient condition is established for the equilibrium of the damped superlinear oscillator $$x^{\prime\prime} + a(t)\phi_q(x^{\prime}) + \omega^2x = 0$$ to be globally asymptotically stable. The obtained criterion is judged by whether the integral of a particular solution of the first-order nonlinear ... | Global Asymptotic Stability for Oscillators with Superlinear Damping | 10.1007/s10884-012-9256-3 |
2012-12-01 | This paper deals with the analysis of active constrained layer damping (ACLD) of geometrically nonlinear vibrations of sandwich plate with orthotropic laminated composite faces separated by a flexible core. The constraining layer of the ACLD treatment is composed of the vertically/obliquely reinforced 1–3 piezoelectric... | Active constrained layer damping of geometrically nonlinear vibrations of smart laminated composite sandwich plates using 1–3 piezoelectric composites | 10.1007/s10999-012-9201-y |
2012-12-01 | In this study, the concept of Output Frequency Response Functions (OFRFs) is applied to represent the transmissibility of nonlinear isolators in frequency domain. With the OFRFs estimated from numerical simulation responses, an explicit analytical relationship between the transmissibility and the nonlinear characterist... | Evaluation of transmissibility for a class of nonlinear passive vibration isolators | 10.1007/s11465-012-0349-9 |
2012-12-01 | The development of a two dimensional numerical wave tank (NWT) with a rocker or piston type wavemaker based on the high order boundary element method (BEM) and mixed Eulerian-Lagrangian (MEL) is examined. The cauchy principle value (CPV) integral is calculated by a special Gauss type quadrature and a change of variable... | Two dimensional fully nonlinear numerical wave tank based on the BEM | 10.1007/s11804-012-1153-y |
2012-12-01 | Floating unit, mooring lines and risers comprise an integrated dynamic system that responds to environmental loading due to wind, waves and currents in a complex way. The sea current forces acting on the moorings/risers and the resulting damping effects can be an important contribution for the floating unit response. F... | The effect of coupled dynamic analysis of floater motions on the mooring and riser system response of a FPSO | 10.1007/BF03449303 |
2012-12-01 | We discuss the unitary equivalence of generators G _ A , R associated with abstract damped wave equations of the type $${\ddot{u} + R \dot{u} + A^*A u = 0}$$ in some Hilbert space $${\mathcal{H}_1}$$ and certain non-self-adjoint Dirac-type operators Q _ A , R (away from the nullspace of the latter) in $${\mathcal{H}_1 ... | Abstract wave equations and associated Dirac-type operators | 10.1007/s10231-011-0200-7 |
2012-12-01 | The stochastic stability of the harmonically and randomly excited Duffing oscillator with damping modeled by a fractional derivative of Caputo’s definition is analyzed. First, the system state is approximately described by Itô equations through the stochastic averaging method based on the generalized harmonic function.... | Stochastic stability of the harmonically and randomly excited Duffing oscillator with damping modeled by a fractional derivative | 10.1007/s11433-012-4888-1 |
2012-12-01 | The use of seismic hysteretic dampers for passive control is increasing exponentially in recent years for both new and existing buildings. In order to utilize hysteretic dampers within a structural system, it is of paramount importance to have simplified design procedures based upon knowledge gained from theoretical st... | Shaking table tests of structures with hysteretic dampers: experimental results versus prediction using non-linear static methods | 10.1007/s10518-012-9375-6 |
2012-12-01 | Shape memory alloys (SMAs) are very interesting smart materials not only for their shape memory and superelastic effects but also because of their significant intrinsic damping capacity. The latter is exhibited upon martensitic transformations and especially in martensitic state. The combination of these SMA properties... | Numerical and Experimental Characterizations of Damping Properties of SMAs Composite for Vibration Control Systems | 10.1007/s11665-012-0293-1 |
2012-12-01 | In this study, the effectiveness of a tuned liquid column-gas damper, TLCGD, on the suppression of seismicinduced vibrations of steel jacket platforms is evaluated. TLCGD is an interesting choice in the case of jacket platforms because it is possible to use the structural elements as the horizontal column of the TLCGD.... | Optimum geometry of tuned liquid column-gas damper for control of offshore jacket platform vibrations under seismic excitation | 10.1007/s11803-012-0143-z |
2012-11-09 | Conflicts and discrepancies around nanoparticle (NP) size effect on the optical properties of metal NPs of sizes below the mean free path of electron can be traced to the internal damping effect of the hybrid resonance of the inner band (IB) and the conduction band (CB) electrons of the noble metals. We present a schem... | Damping effect of the inner band electrons on the optical absorption and bandwidth of metal nanoparticles | 10.1007/s11051-012-1261-2 |
2012-11-01 | A new method for measuring the contribution of the local viscous and dry friction forces on the micrometer scale is described. The velocity dependence of the local friction force is obtained using a dual-axis micromechanical probe with an electrostatic actuator. It is used to obtain the local damping coefficient and dr... | Measured Viscous and Dry Friction Forces in Nanometer-Thick Lubricant Film by Friction Force Microscopy with Micromechanical Probe | 10.1007/s11249-012-0013-x |
2012-11-01 | The reason for the decrease in the amplitude of longitudinal vibration combustion self-oscillations in the combustion chamber of a liquid-propellant rocket engine by means of antipulse partitions has been justified. A mathematical model of the development of combustion instability in such a chamber on attachment of a H... | Concerning the problem of dynamic damping of the vibration combustion self-oscillations in a liquid-propellant rocket engine | 10.1007/s10891-012-0781-z |
2012-11-01 | Quantum Sturm–Liouville problems introduced in our paper (Büyükaşık et al. in J Math Phys 50:072102, 2009 ) provide a reach set of exactly solvable quantum damped parametric oscillator models. Based on these results, in the present paper we study a set of variable parametric nonlinear Madelung fluid models and correspo... | Exactly solvable Madelung fluid and complex Burgers equations: a quantum Sturm–Liouville connection | 10.1007/s10910-012-0060-4 |
2012-11-01 | To investigate the nonlinear vibration behavior of a shrouded blade with friction dynamic contact interface, a friction contact stiffness model is proposed to describe the friction force at different rough interfaces and different normal loads. In the proposed model, the friction contact interface is discretized to a s... | A friction contact stiffness model of fractal geometry in forced response analysis of a shrouded blade | 10.1007/s11071-012-0615-8 |
2012-11-01 | In this study, ground vibrations due to dynamic loadings from trains moving in subway tunnels were investigated using a 2.5D finite element model of an underground tunnel and surrounding soil interactions. In our model, wave propagation in the infinitely extended ground is dealt with using a simple, yet efficient gradu... | Ground-borne vibrations due to dynamic loadings from moving trains in subway tunnels | 10.1631/jzus.A12ISGT5 |
2012-11-01 | Traffic accidents are often caused by vibration of automotive steering because the vibration can make a vehicle run like a snake. A novel semi-active vibration control strategy of automotive steering with magneto-rheological (MR) damper is proposed in this paper. An adaptive RBF neural sliding mode controller is design... | Nonlinear vibration semi-active control of automotive steering using magneto-rheological damper | 10.1007/s11012-012-9572-z |
2012-10-30 | The seismic response of linearly elastic, single-storey, one-way asymmetric building with linear and non-linear viscous dampers is investigated. The response is obtained by numerically solving the governing equations of motion. The effects of eccentricity ratio, uncoupled lateral time period, ratio of uncoupled torsion... | Seismic response of asymmetric systems with linear and non-linear viscous dampers | 10.1186/2008-6695-4-5 |
2012-10-11 | A series of polyurethanes (PUs) based on poly (tetramethylene glycol) (PTMG), poly (ethylene adipate) (PEA) diol, polycaprolactone (PCL) diol and castor oil (CO) were synthesized. The tensile, damping and thermal properties were studied systematically in terms of the composition and isocyanate index ( R ). Results show... | Preparation, tensile, damping and thermal properties of polyurethanes based on various structural polymer polyols: effects of composition and isocyanate index | 10.1007/s10965-012-9994-2 |
2012-10-01 | For forced radial oscillations of gas bubbles in liquids, a more rigorous expression of the acoustic damping constant based on Keller’s equation is developed. Comparison with those in published papers is also made. The expression offered in this paper will improve the predictions of total damping constant in particular... | Effects of Liquid Compressibility on Radial Oscillations of Gas Bubbles In Liquids | 10.1016/S1001-6058(11)60301-6 |
2012-10-01 | The purpose of this study is to investigate analytically a single-degree-of-freedom (SDOF) building structure equipped with a friction damper for assessing its vibration control effect. Friction dampers are installed between stories to reduce inter-story displacements of building structures subjected to external loadin... | Analytical investigation of an SDOF building structure equipped with a friction damper | 10.1007/s11071-012-0446-7 |
2012-10-01 | Cholinesterases (ChEs) display a hysteretic behavior with certain substrates and inhibitors. Kinetic cooperativity in hysteresis of ChE-catalyzed reactions is characterized by a lag or burst phase in the approach to steady state. With some substrates damped oscillations are shown to superimpose on hysteretic lags. Thes... | Time-dependent kinetic complexities in cholinesterase-catalyzed reactions | 10.1134/S0006297912100070 |
2012-10-01 | In this paper vibration damping capacity of shape memory alloys (SMA) is studied which is based on two-dimensional Oberaigner, Fischer and Tanaka model. The thermodynamic based active and passive control paradigms in SMA are presented. The model solution is presented along with modification based on exact solution for ... | Analytical technique for the two-dimensional stress wave model of memory alloy dampers | 10.1007/s12206-012-0814-8 |
2012-10-01 | In this paper, the occurrence of various types of bifurcation including symmetry breaking, period-doubling (flip) and secondary Hopf (Neimark) bifurcations in milling process with tool-wear and process damping effects are investigated. An extended dynamic model of the milling process with tool flank wear, process dampi... | Bifurcation analysis of milling process with tool wear and process damping: regenerative chatter with primary resonance | 10.1007/s11071-012-0470-7 |
2012-10-01 | This paper proposes a new finite element model for active constrained layer damped (CLD) rotating plate with self-sensing technique. Constrained layer damping can effectively reduce the vibration in rotating structures. Unfortunately, most existing research models the rotating structures as beams that are not the case ... | Modeling and analysis of rotating plates by using self-sensing active constrained layer damping | 10.1007/s12206-012-0817-5 |
2012-10-01 | A piezoelectric plate with a damper and a matching layer is considered. Water was chosen as an acoustic load. On the basis of the use of the apparatus of circuits-analogues of piezoelectric transducers (PETs), the relationships were obtained that determine the frequency dependences of the modulus and phase of the input... | On the problem of the frequency dependences of the input electric impedance of a broadband immersion transducer | 10.1134/S1061830912100063 |
2012-10-01 | In the present study, the Volterra series theory is adopted to theoretically investigate the force transmissibility of multiple degrees of freedom (MDOF) structures, in which an isolator with nonlinear anti-symmetric viscous damping is assembled. The results reveal that the anti-symmetric nonlinear viscous damping can ... | Reducing force transmissibility in multiple degrees of freedom structures through anti-symmetric nonlinear viscous damping | 10.1007/s10409-012-0100-0 |
2012-10-01 | Methods of studies are based on solving a nonlinear system of equations of magnetically connected circuits. Determination of the currents in elements of damping windings of salient and nonsalient pole types of machines and series of linear transformations of MMF and flux density in a complex plane is carried out; MMF a... | Electromagnetic loads of synchronous machines in asynchronous modes (taking into consideration current distribution in the damping winding) | 10.3103/S1068371212100033 |
2012-10-01 | In this paper, a novel scheme for nonlinear displacement-dependent (NDD) damper is introduced. The damper is attached to a simple mass-spring-damper vibration system. The vibration system equipped with a NDD damper is mathematically modeled and the nonlinear governing differential equation of the system is derived. To ... | A novel scheme for nonlinear displacement-dependent dampers | 10.1007/s11071-012-0465-4 |
2012-10-01 | A stochastic fractional optimal control strategy for quasi-integrable Hamiltonian systems with fractional derivative damping is proposed. First, equations of the controlled system are reduced to a set of partially averaged It $\hat{o}$ stochastic differential equations for the energy processes by applying the stochasti... | Stochastic fractional optimal control of quasi-integrable Hamiltonian system with fractional derivative damping | 10.1007/s11071-012-0547-3 |
2012-10-01 | The equations governing wind-induced internal pressure responses for a two-compartment building with a dominant opening and background porosity were derived. The unsteady form of the Bernoulli equation, the law of mass conservation, and adiabatic equation were used for the derivation. The precision of the governing equ... | Responses of wind-induced internal pressure in a two-compartment building with a dominant opening and background porosity Part 1: Theoretical formulation and experimental verification | 10.1007/s11771-012-1362-1 |
2012-10-01 | The complex behaviors of Duffing equation with periodic damping and external excitations are investigated. The existence conditions and bifurcations of periodic orbits with three different frequencies resonant conditions are concerned by the second-order averaging method and the Melnikov method. The rich dynamical beha... | Bifurcations of periodic orbits in Duffing equation with periodic damping and external excitations | 10.1007/s11071-012-0467-2 |
2012-10-01 | In this paper, a new kind of combined lead extrusion magnetorheological (CLEMR) damper is proposed. First, tests on CLEMR damper at different currents, excitation amplitudes, and frequencies are carried out. Experimental results show that even when power fails, CLEMR damper can still absorb and dissipate vibration ener... | Testing and modeling of a CLEMR damper and its application in structural vibration reduction | 10.1007/s11071-012-0557-1 |
2012-10-01 | This work develops an analytical approach to optimally design electrorheological (ER) dampers, especially for vehicle suspension system. The optimal design considers both stability and ride comfort of vehicle application. After describing the schematic configuration and operating principle of the ER damper, a quasi-sta... | An analytical approach to optimally design of electrorheological fluid damper for vehicle suspension system | 10.1007/s11012-012-9544-3 |
2012-09-01 | Correlating damage level and changes in dynamic characteristics of a structure forms the basis for damage detection techniques in structural health monitoring. In reinforced concrete building structures such correlation is not well established. A damage detection technique capable of identifying the structural conditio... | Variation of Small Amplitude Vibration Dynamic Properties with Displacement in Reinforced Concrete Structures | 10.1007/s11340-011-9590-0 |
2012-09-01 | In this study, through novel drift-based equations of motion in the frequency domain, optimum placement and characteristics of linear velocity-dependent dampers are investigated. In this study, the sum of the square of the absolute values of transfer matrix elements for interstory drifts is considered as the optimizati... | Optimum placement and characteristics of velocity-dependent dampers under seismic excitation | 10.1007/s11803-012-0130-4 |
2012-09-01 | This study proposes a modified eccentric circle model to simulate the rolling resistance of circle particles through the distinct element method (DEM) simulation. The proposed model contains two major concepts: eccentric circle and local rotational damping. The mass center of a circular particle is first adjusted sligh... | Modeling Particle Rolling Behavior by the Modified Eccentric Circle Model of DEM | 10.1007/s00603-012-0227-0 |
2012-09-01 | This paper examines the quasi-static cyclic behavior, lateral strength and equivalent damping capacities of a system of post-tensioned segmental bridge columns tied with large diameter martensitic Shape Memory Alloy (SMA) link-bars. Moment-curvature constitutive relationships are formulated and analysis tools are devel... | Modeling and cyclic behavior of segmental bridge column connected with shape memory alloy bars | 10.1007/s11803-012-0128-y |
2012-09-01 | This paper deals with the analysis of active constrained layer damping (ACLD) of sandwich plate with laminated composite faces. The constraining layer of the ACLD treatment is composed of the vertically/obliquely reinforced 1–3 piezoelectric composites. Several honeycomb core materials like HEREX honeycomb and honeycom... | Active constrained layer damping of smart laminated composite sandwich plates using 1–3 piezoelectric composites | 10.1007/s10999-012-9186-6 |
2012-09-01 | Hollow-core composite post insulators, used in high voltage electrical equipment, are important parts of the power substation systems. In many applications the composite insulators are considered as slender cantilever columns, fixed at one end and connecting to a conductor at the other end. During earthquakes the post ... | Experimental test and modeling of hollow-core composite insulators | 10.1007/s11071-012-0376-4 |
2012-09-01 | The use of chamfered tools is widely spread in cutting processes. Prior investigation show, that a chamfer on the rake face of a milling tool can increase the stability of cutting processes significantly due to a contact between the chamfer surface and the workpiece and the resulting damping forces. In addition to high... | Flank milling of compliant workpieces with chamfered tools | 10.1007/s11740-012-0399-1 |
2012-09-01 | Response surface methodology (RSM) is a technique used to determine and represent the cause and effect of relationship between true mean responses and input control variables influencing the responses as an n-dimensional hyper surface. Welded joints are used extensively in many modern industries to fabricate jointed st... | Slip Damping Mechanism in Welded Structures Using Response Surface Methodology | 10.1007/s11340-011-9563-3 |
2012-09-01 | The contributions of compressive load and support damping are included into the formulation of flexural wave motion in beams lying on elastic (Winkler) foundation. The beam is modeled by both Euler–Bernoulli’s and Timoshenko’s theories. First, dispersion analysis is performed, which reveals that, for a fixed wavenumber... | Effects of compressive load and support damping on the propagation of flexural waves in beams resting on elastic foundation | 10.1007/s00419-012-0611-y |
2012-09-01 | The Inner Formation Flying System (IFFS) consisting of an outer satellite and an inner satellite which is a sphere proof mass freely flying in the shield cavity can construct a pure gravity orbit to precisely detect the earth gravity field. The residual gas in the cavity is a significant disturbance source due to the t... | Analysis of residual gas disturbance on the inner satellite of Inner Formation Flying System | 10.1007/s11431-012-4962-y |
2012-09-01 | We study the distribution of eigenvalues for non-selfadjoint perturbations of selfadjoint semiclassical analytic pseudodifferential operators in dimension two, assuming that the classical flow of the unperturbed part is completely integrable. An asymptotic formula of Weyl type for the number of eigenvalues in a spectra... | Diophantine Tori and Weyl Laws for Non-selfadjoint Operators in Dimension Two | 10.1007/s00220-012-1530-z |
2012-09-01 | The problem of the forced axisymmetric vibrations and self-heating of a clamped flexible circular plate with piezoelectric actuators is solved. The aspects of mechanical and electric excitation of vibrations and damping of mechanical vibrations with actuators are discussed. The effect of geometrical nonlinearity on the... | Forced resonant vibrations and self-heating of a flexible circular plate with piezoactuators | 10.1007/s10778-012-0540-z |
2012-09-01 | In this study we utilize the self-sensing capabilities of piezoelectric micro-actuators in hard disk drives (HDD) to actively suppress in-plane resonance modes of the suspension in an HDD. The self-sensing circuit is based on a tunable capacitance bridge that decouples the control signal from the sensing signal in the ... | Suppression of cross-track vibrations using a self-sensing micro-actuator in hard disk drives | 10.1007/s00542-012-1533-x |
2012-09-01 | An environmental vibration problem occurred at a house near a highway bridge on soft ground. Vibration experiments with a test truck were performed to investigate the cause of the problem and the vibration characteristics of the bridge and house. Experimental results showed that the house was resonating with the bridge... | Effectiveness of dampers in controlling a vibration problem near a highway bridge | 10.1007/s13349-012-0022-3 |
2012-09-01 | In this paper, a control strategy is applied to a nonlinear ideal and nonideal vibrating system coupled to a magneto-rheological damping structure, exhibiting chaotic behavior. In order to suppress the chaotic oscillations and to improve the transient response, a combination of passive (energy pumping) and active (stat... | On energy transfer phenomena, in a nonlinear ideal and nonideal essential vibrating systems, coupled to a (MR) magneto-rheological damper | 10.1007/s11071-012-0391-5 |
2012-09-01 | In this study, the structural control strategy utilizing a passive tuned mass damper (TMD) system as a seismic damping device is outlined, highlighting the parametric optimization approach for displacement and acceleration control. The theory of stationary random processes and complex frequency response functions are e... | Parametric control of structural responses using an optimal passive tuned mass damper under stationary Gaussian white noise excitations | 10.1007/s11709-012-0170-x |
2012-08-30 | We investigate the degenerate Kirchhoff equations with strong damping and source terms of the form ε u t t − ∥ ∇ u ∥ 2 2 γ Δ u − Δ u t = f ( u ) , in a bounded domain. We obtain the optimal decay rate for ∥ ∇ u t ∥ 2 2 by deriving its decay estimate from below, provided that either ε is suitably small or the initial da... | On decay properties of solutions for degenerate Kirchhoff equations with strong damping and source terms | 10.1186/1687-2770-2012-93 |
2012-08-08 | In this paper, we study the strongly damped quasilinear wave equation. By using spatial sequence techniques and energy estimate methods, we obtain the existence theorem of the solution to abstract a strongly damped wave equation and to a class of strongly damped quasilinear wave equations. MSC: 35L05, 35L20, 35D30, 35D... | Existence of solutions to strongly damped quasilinear wave equations | 10.1186/1687-1847-2012-139 |
2012-08-01 | The goal of this work is to study a model of the strongly damped wave equation with dynamic boundary conditions and nonlinear boundary/interior sources and nonlinear boundary/interior damping. First, applying the nonlinear semigroup theory, we show the existence and uniqueness of local in time solutions. In addition, w... | Existence and Asymptotic Behavior of the Wave Equation with Dynamic Boundary Conditions | 10.1007/s00245-012-9165-1 |
2012-08-01 | We present a quantized model of a harmonically confined dot atom with inherent damping in the presence of a transverse magnetic field. The model leads to a non-Hermitian Hamiltonian in coordinate space. We have analytically studied the effects of damping on Rabi type oscillations of the system. The model explains the d... | Rabi type oscillations in damped two-dimensional single electron quantum dots | 10.2478/s11534-012-0064-5 |
2012-08-01 | An inorganically template metaphosphate of Co(II) complex has been synthesized and thermal properties have been studied at a low temperature up to 173 K from 298 K by the Differential Scanning Calorimeter (DSC). The specific heat capacity is measured in atmospheric O_2 at a heating rate of 283 K min^−1 from 298 K and k... | Superconductivity of Metaphosphatecobalt(II) Salt at 173 K | 10.1007/s10948-012-1589-y |
2012-08-01 | In this paper, we consider an n-dimensional thermoelastic system of second sound with a viscoelastic damping localized on a part of the boundary. We establish an explicit and general decay rate result that allows a wider class of relaxation functions and generalizes previous results existing in the literature. | Boundary stabilization of memory-type thermoelasticity with second sound | 10.1007/s00033-011-0190-8 |
2012-08-01 | The present experimental investigations study the effect of layering over rigid base on the dynamic behavior of foundation under vertical mode of vibration. Model block vibration tests were conducted on a rigid surface footing resting on different layered soil systems underlain by rigid base. The rigid base was used to... | Dynamic Response of the Foundations Resting on a Two-layered Soil Underlain by a Rigid Layer | 10.1007/s10706-012-9497-2 |
2012-08-01 | The stability of a kind of one-dimensional thermo-elastic system of type II is considered. This system consists of two strongly coupled wave equations. Suppose that there exists an viscoelastic damping at one end of the 1-d domain. If without coupling, this damping always makes one of these two wave equations (the corr... | Stability analysis of a thermo-elastic system of type II with boundary viscoelastic damping | 10.1007/s00033-011-0184-6 |
2012-08-01 | Objective To investigate a method for quantitative differential diagnosis of damp-heat and cold-damp impeding syndrome of rheumatoid arthritis (RA) in Chinese medicine (CM). Methods Laboratory parameters were collected from 306 patients with RA. The clinical symptoms and laboratory parameters were compared between pati... | Logistic regression analysis of damp-heat and cold-damp impeding syndrome of rheumatoid arthritis: A perspective in Chinese medicine | 10.1007/s11655-012-1172-1 |
2012-08-01 | A self-consistent linear model is proposed for the transformation of the average intensity of the mode spectrum I ( z ) of the waveguide field in a multimode optical fiber with a stepped refractive index profile and the core having a rough surface. The model is based on the concept of the intermodal dispersion matrix o... | Interaction and dispersion of waveguide modes in an optical fiber with microirregularities of the core surface | 10.1007/s11182-012-9809-2 |
2012-08-01 | Methods of investigation of currents in elements of closed chain schemes, each link of which contains an EMF, having the same amplitude and following the harmonic law from link number N are stated. This scheme is a mathematical regime of damper windings of modern synchronous machines (salient-pole generators and motors... | A study of currents in elements of a closed regular chain scheme (with reference to damper windings of synchronous machines) | 10.3103/S1068371212080056 |
2012-08-01 | In this article, the charged system search (CSS) optimization method is improved to identify the parameters of a non-linear hysteretic Bouc-Wen differential model. The CSS is suitable for those optimization problems involving non-smooth or non-convex domains. Bouc-Wen is a well-established non-linear model which has be... | Parameter identification of Bouc-Wen model for MR fluid dampers using adaptive charged system search optimization | 10.1007/s12206-012-0625-y |
2012-07-20 | In this paper, we study a strongly damped plate or beam equation. By using spatial sequence techniques and energy estimate methods, we obtain an existence theorem of the solution to abstract strongly damped plate or beam equation and to a nonlinear plate or beam equation. MSC: 35L05, 35L20, 35D30, 35D35. | Existence of solutions to strongly damped plate or beam equations | 10.1186/1687-2770-2012-76 |
2012-07-05 | In this article, we establish the new result on homoclinic orbits for a class of damped vibration systems. Some recent results in the literature are generalized and significantly improved. MSC: 49J40, 70H05. | On homoclinic orbits for a class of damped vibration systems | 10.1186/1687-1847-2012-102 |
2012-07-01 | This article deals with the question, to what extent damping due to nonsmooth Coulomb friction may affect the stability and bifurcation behavior of vibrational systems with self-excitation due to negative effective damping which—for the smooth case—is related to a Hopf bifurcation of the steady state. Without damping d... | On the effect of nonsmooth Coulomb friction on Hopf bifurcations in a 1-DoF oscillator with self-excitation due to negative damping | 10.1007/s11071-011-0290-1 |
2012-07-01 | This paper investigates the optimal distribution of damping material in vibrating structures subject to harmonic excitations by using topology optimization method. Therein, the design objective is to minimize the structural vibration level at specified positions by distributing a given amount of damping material. An ar... | On topology optimization of damping layer in shell structures under harmonic excitations | 10.1007/s00158-011-0746-4 |
2012-07-01 | This paper proposes a simple methodology to analyse numerically the effects of air damping on the oscillatory motion of heated micro-cantilevers. The proposed methodology is fully solved by the fluid solver, because the solid domain is embedded into a subroutine executed at the end of each time step. The methodology is... | A simple numerical methodology for thermal-fluid-structural interactions of air damping over heated micro-cantilevers | 10.1007/s10404-012-0951-5 |
2012-07-01 | A mathematical model of wave propagation and instability on a charged surface of an infinite cylindrical column of a conducting fluid, surrounding a coaxial infinite porous core, is formulated and studied. The conditions are found under which the disturbances of the liquid column become unstable and result in its fragm... | Wave propagation on a charged surface of a cylindrical liquid column surrounding a long porous core | 10.1134/S0015462812040114 |
2012-07-01 | We investigate an analytical solution for a two-qubit field system in the dispersive regime with a reservoir. We analyze the influence of the phase damping on the Wigner function and the phase properties. We found that the phase damping destroys the phase probability of the global system for the coherent state and even... | Wigner function and phase properties for a two-qubit field system under pure phase noise | 10.1007/s10946-012-9292-9 |
2012-07-01 | The addition by vacuum infiltration of small quantities of a polymer has been found to increase significantly the ability of a plasma-sprayed coating to dissipate vibratory energy at temperatures in the glassy-rubbery transition range of the polymer. As vitreous enamels and glasses undergo a glassy transition, but at m... | Influence of Glass Content on Damping Properties of Plasma-Sprayed Mixtures of Zirconia and Glass | 10.1007/s11665-011-0011-4 |
2012-07-01 | We establish new Kamenev-type oscillation criteria for the half-linear partial differential equation with damping (E) $div(A(x)\left\| {\nabla u} \right\|^{p - 2} \nabla u) + \left\langle {b(x),\left\| {\nabla u} \right\|^{p - 2} \nabla u} \right\rangle + c(x)\left| u \right|^{p - 2} u = 0$ under quite general conditio... | New Kamenev-type oscillation criteria for half-linear partial differential equations | 10.1007/s10255-012-0168-0 |
2012-07-01 | After central nervous system (CNS) trauma, axons have a low capacity for regeneration. Regeneration failure is associated with a muted regenerative response of the neuron itself, combined with a growth-inhibitory and cytotoxic post-injury environment. After spinal cord injury (SCI), resident and infiltrating immune cel... | Achieving CNS axon regeneration by manipulating convergent neuro-immune signaling | 10.1007/s00441-012-1425-5 |
2012-07-01 | A semi-active magneto-rheological (MR) damper was experimentally investigated and compared to an original equipment manufacturer (OEM) damper for a passenger vehicle, by using a quarter car models. A full-scale two-degree-of-freedom quarter car experimental set-up was constructed to study the vehicle suspension. On-off... | Semi-active control of a vehicle suspension using magneto-rheological damper | 10.1007/s11771-012-1217-9 |
2012-07-01 | In this paper, ongoing studies to solve nonlinear differential equations are extended by combining the Newmark-beta integration method and the piecewise linearization approach. The discussed method is illustrated with a practical example. In doing so, the coupled nonlinear differential equations of an impact oscillator... | An efficient method to solve the strongly coupled nonlinear differential equations of impact dampers | 10.1007/s00419-011-0605-1 |
2012-07-01 | In this paper we analyze the importance of initial conditions in exponential smoothing models on forecast errors and prediction intervals. We work with certain exponential smoothing models, namely Holt’s additive linear and Gardner’s damped trend. We study some probability properties of those models, showing the influe... | Initial conditions estimation for improving forecast accuracy in exponential smoothing | 10.1007/s11750-011-0221-9 |
2012-07-01 | Most of the currently employed vibration-based identification approaches for structural damage detection are based on eigenvalues and/or eigenvectors extracted from dynamic response measurements, and strictly speaking, are only suitable for linear system. However, the inception and growth of damage in engineering struc... | Restoring force and dynamic loadings identification for a nonlinear chain-like structure with partially unknown excitations | 10.1007/s11071-011-0260-7 |
2012-06-01 | Metal cutting processes involve interaction of the machining forces with the work piece. In this processes the vibrations are induced in machine tools which have adverse effect on tool life, surface integrity and occurrence of undesirable chatter phenomenon. In order to enhance the quality of surface of the work piece ... | Experimental investigation of magneto rheological damping effect on surface roughness of work piece during end milling process | 10.1007/s12541-012-0109-0 |
2012-06-01 | In this paper, numerical modeling and model testing of a complex-shaped remotely-operated vehicle (ROV) were shown. The paper emphasized the systematic modeling of hydrodynamic damping using the computational fluid dynamic software ANSYS-CFX™ on the complex-shaped ROV, a practice that is not commonly applied. For initi... | Modeling and testing of hydrodynamic damping model for a complex-shaped remotely-operated vehicle for control | 10.1007/s11804-012-1117-2 |
2012-06-01 | An integral equation approach is utilized to investigate the added mass and damping of floating production, storage and offloading system (FPSO system). Finite water depth Green function and higher-order boundary element method are used to solve integral equation. Numerical results about added mass and damping are pres... | Numerical analysis of added mass and damping of floating production, storage and offloading system | 10.1007/s10409-012-0075-x |
2012-06-01 | Pb(Zr $_{\mathbf{0\boldsymbol{\cdot}53}}$ Ti $_{\mathbf{0\boldsymbol{\cdot}47}})$ O_ 3 (PZT) thin films were prepared on Pt/Ti/SiO_ 2 /Si substrate by sol–gel method. The effect of film thickness on microstructure, ferroelectric and dielectric properties was investigated. The single-phase PZT films were obtained with d... | Damping properties of epoxy-based composite embedded with sol–gel-derived Pb(Zr_
0.53
Ti_
0.47
)O_
3
thin film with different thicknesses | 10.1007/s12034-012-0288-4 |
2012-06-01 | Currently, as well as in the past, researchers have shown great interest in developing suspension systems for vehicles and especially in the design and optimization of the suspension parameters, such as the stiffness and the damping coefficient. These parameters are considered to be important factors that have an influ... | Possible experimental method to determine the suspension parameters in a simplified model of a passenger car | 10.1007/s12239-012-0059-7 |
2012-06-01 | Biopolymers are vital structures for many living organisms; for a variety of bacteria, adhesion polymers play a crucial role for the initiation of colonization. Some bacteria express, on their surface, attachment organelles (pili) that comprise subunits formed into stiff helix-like structures that possess unique biomec... | Helix-like biopolymers can act as dampers of force for bacteria in flows | 10.1007/s00249-012-0814-8 |
2012-06-01 | A synchronous control system for dual parallel stages is proposed in order that the synchronous error owing to the skew disturbances can be quickly and stably eliminated. The control system is composed of two disturbance observers and a synchronous controller. The two disturbance observers are designed to decrease the ... | A method of synchronous control system for dual parallel motion stages | 10.1007/s12541-012-0115-2 |
2012-06-01 | This article studies the Cauchy problem for the coupled nonlinear Klein-Gordon equations with damping terms. By introducing a family of potential wells, we derive the invariant sets and the vacuum isolating of solutions. Furthermore, we show the global existence, finite time blow-up, as well as the asymptotic behavior ... | Global Existence, Blow-up and Asymptotic Behavior of Solutions for a Class of Coupled Nonlinear Klein-Gordon Equations with Damping Terms | 10.1007/s10440-011-9662-2 |
2012-06-01 | Optimal problems are investigated in the present work in order to control the natural frequencies of a torsional shaft system including the total weight constraint and effects of tuned mass dampers. Maier objective functional is used. Pontryagin’s Maximum Principle is employed to derive necessary optimality conditions ... | Optimal design of a torsional shaft system using Pontryagin’s Maximum Principle | 10.1007/s11012-011-9504-3 |
2012-06-01 | This paper proposes a base isolating system to reduce the seismic demands of low- or medium-rise structures and experimentally investigates its seismic response using shake-table tests. The base isolating system considered in this study consists of laminated-rubber bearings and U-shaped hysteretic (UH) dampers which ar... | Seismic response of base isolating systems with U-shaped hysteretic dampers | 10.1007/s13296-012-2011-0 |
2012-06-01 | An accurate and efficient differential quadrature time element method (DQTEM) is proposed for solving ordinary differential equations (ODEs), the numerical dissipation and dispersion of DQTEM is much smaller than that of the direct integration method of single/multi steps. Two methods of imposing initial conditions are... | Differential quadrature time element method for structural dynamics | 10.1007/s10409-012-0081-z |
2012-06-01 | First arrival travel time tomography has achieved wide application. However, tomographic resolution is insufficient because geometry constraints cause rays to be unevenly distributed in the velocity model. The variable damping constraint method adopts uneven priori information to match uneven data distribution which ca... | Variable damping constraint tomography and its application in VSP Data | 10.1007/s11770-012-0328-2 |
2012-06-01 | The rotating chamber is expected to significantly benefit mid-caliber automatic guns with the high firepower-to-armament space ratio. However, the parallel index, which is a core component of the chamber system, tends to be flexible in rapid operation. This may cause the chamber prone to torsional vibration so that ser... | Torsional vibration control of the rotating chamber using a reaction wheel | 10.1007/s12541-012-0116-1 |
2012-06-01 | This paper presents an original approach to the problem of controlling a magnetorheological suspension of a driver’s seat for optimal reduction of whole-body vibration. The concept consists in taking into consideration the individual personal features (biomechanical parameters) of the driver in the control process of a... | Controlling the magnetorheological suspension of a vehicle seat including the biomechanics of the driver | 10.2478/s13531-011-0061-2 |
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