Showing papers in "Journal of Sound and Vibration in 2009"

TL;DR: In this article, the authors investigated the design and analysis of a novel energy harvesting device that uses magnetic levitation to produce an oscillator with a tunable resonance and derived the governing equations for the mechanical and electrical domains to show the designed system reduces to the form of a Duffing oscillator under both static and dynamic loads.

TL;DR: In this paper, an edge-based smoothed finite element method (ES-FEM) was proposed to improve the accuracy of the FEM without much changing to the standard FEM settings.

TL;DR: In this article, the third-order shear deformation plate theory of Reddy is reformulated using the nonlocal linear elasticity theory of Eringen, which has ability to capture the both small scale effects and quadratic variation of shear strain and consequently shear stress through the plate thickness.

TL;DR: In this paper, the nonlocal differential constitutive relations of Eringen have been used to solve the governing equations for simply supported boundary conditions for the analysis of double layered nanoplates.

TL;DR: A free vibration analysis of metal and ceramic functionally graded plates that uses the element-free kp-Ritz method is presented in this paper, where the material properties of the plates are assumed to vary continuously through their thickness according to a power-law distribution of the volume fractions of the plate constituents.

TL;DR: In this article, the authors derived the force transmissibility of a quasi-zero-stiffness isolator, which consists of a vertical spring and two oblique springs that are either linear, linear with pre-stress or softening nonlinear with prestress.

TL;DR: This paper is the most comprehensive review published to date, of 270 references dealing with different experimental and analytical characterizations of human walking loading, and introduces methods for indirect measurement of time-varying records of walking forces via combination of visual motion tracking (imaging) data and known body mass distribution.

TL;DR: In this paper, a simplified mathematical model is proposed to describe the mechanisms leading to modulation sidebands of planetary gear sets, which includes key system parameters such as number of planets, planet position angles, and planet phasing relationships defined by the position angles and the number of teeth of the gears.

TL;DR: In this paper, the dynamics of conical, cylindrical shells and annular plates were analyzed using the first-order shear deformation theory (FSDT) and the generalized differential quadrature (GDQ) method.

TL;DR: In this article, the authors studied the effect of damping on power optimality of a piezoelectric vibration-based energy harvester, which utilizes a harvesting circuit employing an inductor and a resistive load.

TL;DR: In this article, an electromechanically coupled finite element (FE) plate model is presented for predicting the electrical power output of piezoelectric energy harvester plates.

TL;DR: In this paper, a solution strategy is presented that allows for the evaluation of the second-order statistics of the response due to dynamic excitation based on the power spectral density function of the track unevenness.

TL;DR: In this paper, a new concept of energy-harvesting, the flutter-mill, is proposed in which these flutter motions are utilized to generate electrical power, based on the energy analysis of the fluid-structure interaction system.

TL;DR: In this article, an alternative approach that can be applied to a very large class of dynamical systems (autonomous or forced) with smooth equations is presented. But the main idea is to systematically recast the dynamical system in quadratic polynomial form before applying the harmonic balance method.

TL;DR: In this article, a non-dimensional analysis of the magnetic support is considered and it is shown analytically that for cubical magnets the ratio of force to displacement is directly proportional to face area.

TL;DR: In this article, a model based technique for fault diagnosis of rotor bearing system is described using residual generation technique, residual vibrations are generated from experimental results for the rotor bearing systems subject to misalignment and unbalance, and then the residual forces due to presence of faults are calculated.

TL;DR: In this paper, the displacement solution is expressed as a two-dimensional Fourier series supplemented with several one-dimensional series, which is capable of representing any function (including the exact displacement solution) whose third-order partial derivatives are (required to be) continuous over the area of the plate.

TL;DR: In this paper, the authors presented a thermal-mechanical vibration analysis of functionally graded (FG) beams and functionally graded sandwich (FGSW) beams using modified differential quadrature method (MDQM) and modified weighting coefficient matrix (MWCM).

TL;DR: In this article, the authors proposed an indirect approach for extracting bridge frequencies from a passing vehicle, which works mainly for the first frequency and can be used to extract bridge frequencies of higher modes.

TL;DR: In this paper, the authors studied the nonlinear vibration of beams made of functionally graded materials (FGMs) containing an open edge crack based on Timoshenko beam theory and von Karman geometric nonlinearity.

TL;DR: In this article, an analytical model is proposed to study the nonlinear dynamic behavior of rolling element bearing systems including surface defects, and the results were obtained in the form of time series, frequency responses and phase trajectories.

TL;DR: In this paper, a tuned passive control is used to damp unstable combustion systems, with particular emphasis on systems which exhibit multiple unstable modes, and two algorithms are developed, one for identifying the characteristics of all modes present in real time, and another for tuning the neck areas of the Helmholtz resonators.

TL;DR: The wave and finite element (WFE) method is a numerical approach to the calculation of the wave properties of structures of arbitrary complexity as discussed by the authors, which is prone to numerical difficulties.

TL;DR: In this article, an analytical technique for the treatment of certain class of nonlinear damping functions is developed, and the case of piecewise-quadratic damping is investigated in a system comprising of a linear oscillator and a nonlinear energy sink.

TL;DR: In this paper, exact closed-form expressions for the vibration modes of the Euler-Bernoulli beam in the presence of multiple concentrated cracks are presented explicitly as functions of four integration constants only, to be determined by the standard boundary conditions.

TL;DR: In this paper, the authors developed models for predicting particle dampers (PDs) behavior using the Discrete Element Method (DEM), where individual particles are typically represented as elements with mass and rotational inertia.

TL;DR: In this paper, the entropy noise mechanism was investigated both experimentally and numerically on a generic test case, where electrical heating was used to generate non-isentropic perturbations in a spatially varying average flow field set by the geometrical boundary conditions of an axisymmetric convergent-divergent nozzle.

TL;DR: In this paper, a comprehensive model of an electrostatically actuated microcantilever beam separated from the ground plane by relatively larger gap is formulated accounting for the nonlinearities of the system arising out of electric forces, geometry of the deflected beam and the inertial terms.

TL;DR: In this paper, the performance of a nonlinear tuned mass damper (NTMD) was investigated using the numerical continuation software AUTO and the optimization of periodic solutions and parameter sweeps.

TL;DR: In this article, the authors extended the analysis of the self-excited vibrations of a drilling structure presented in an earlier paper by basing the formulation of the model on a continuum representation of the drillstring rather than on a characterization of the drilling structure by a 2 degree of freedom system.