Showing papers in "Journal of Sound and Vibration in 2008"

TL;DR: In this paper, a comprehensive assessment of recent developments of nonlinear isolators in the absence of active control means is presented, which highlights resolved and unresolved problems and recommendations for future research directions.

TL;DR: In this article, a unified approach for analyzing the static and dynamic behaviors of functionally graded beams (FGB) with the rotary inertia and shear deformation included is presented, where all material properties are arbitrary functions along the beam thickness.

TL;DR: In this paper, a vibration isolator consisting of a vertical linear spring and two nonlinear pre-stressed oblique springs is considered, and the softening parameter leading to quasi-zero dynamic stiffness at the equilibrium position is obtained as a function of the initial geometry, pre-stress and the stiffness of the springs.

TL;DR: In this article, the effects of tooth crack on the vibration response of a one-stage gearbox with spur gears are studied and the growth in a tooth crack is reflected in the total mesh stiffness of the gear system.

TL;DR: In this article, a wave/finite element (WFE) method is described by which the dispersion relations for a two-dimensional structural component can be predicted from a finite element (FE) model.

TL;DR: In this paper, the authors proposed a highstatic-low-dynamic stiffness (HSLDS) mount, which consists of two vertical mechanical springs between which an isolated mass is mounted.

TL;DR: In this article, the authors proposed a topology optimization method based on continuous material interpolation functions in the density and bulk modulus to reduce the sound pressure amplitude in the shadow zone behind a sound barrier.

TL;DR: In this article, the free vibration of functionally graded material sandwich rectangular plates with simply supported and clamped edges is studied based on the three-dimensional linear theory of elasticity, and the natural frequencies of simply supported power-law FGM sandwich plates are compared with results from different two-dimensional plate theories.

TL;DR: In this paper, the authors demonstrate that by adding periodic forcing to a vibrationally excited energy harvesting mechanism, the power available from the device is apparently enhanced over a mechanism without periodic forcing.

TL;DR: In this paper, the authors show that the bulk modulus of viscoelastic materials exhibits a singularity at ν = 1/2 and that the changes in the modulus are negligible as ν approaches 1 2.

TL;DR: In this paper, the authors analyzed the compromise between rapidity of motion and shaper robustness for several input-shaping methods and showed that robust shapers typically have longer durations that slow the system response.

TL;DR: In this paper, simple approximate non-dimensional expressions, and the corresponding displacement amplitudes for the jump-up and jump-down frequencies of a softening and hardening lightly damped Duffing oscillator with linear viscous damping are presented.

TL;DR: In this article, a C0 finite element formulation is used to carry out free vibration analysis of curved panels using a higher-order formulation, which includes Sanders' approximation for doubly curved shells considering the effects of rotary inertia and transverse shear.

TL;DR: In this paper, a distributed electromechanical model that accounts for electrostatic fringing fields, finite deflections and residual stresses was proposed to describe the behavior of the frequency versus voltage diagram for narrow microbeams.

TL;DR: In this article, the authors investigated the development of a chatter detection system for application in industrial conditions, in which the signal characteristics both in time and frequency domain were condensed into a set of chatter indicators, which were further elaborated by means of statistical basic concepts to obtain a chatter identification system.

TL;DR: In this paper, a new OMA approach to identify modal parameters from output-only transmissibility measurements is introduced, which does not make any assumption about the nature of the excitations to the system.

TL;DR: In this article, the authors investigated the plane wave propagation in hexagonal and reentrant lattices through the application of Bloch's theorem and derived two-dimensional dispersion relations to illustrate peculiar properties of re-entrant configurations and investigate the directional behavior of hexagonal lattices for varying construction angles.

TL;DR: In this article, three solution processes are proposed for predicting the stability of variable pitch or helix milling tools at low or high radial immersions, and good agreement is found with both previously published results and the time-domain model.

TL;DR: In this article, it was shown that if the time-periodic coefficients in the delayed Mathieu equation are approximated by piecewise constant functions, then there is no need to use higher than first-order approximations of the delayed term.

TL;DR: In this article, a new configuration using two controllable dampers and two constant springs is proposed to control variable stiffness and damping in a semi-active system with variable damping.

TL;DR: In this article, the authors used the transfer matrix method to calculate the complex band structure of the flexural wave to investigate the gap frequency range and the vibration reduction in band gap.

TL;DR: In this paper, the authors used fuzzy logic and PD controllers for a multi-degree-of-freedom structure with active tuned mass damper (ATMD) to suppress earthquake-induced vibrations.

TL;DR: In this paper, an analytical study on the free and forced vibration of inhomogeneous Euler-Bernoulli beams containing open edge cracks is presented, where the beam is subjected to an axial compressive force and a concentrated transverse load moving along the longitudinal direction.

TL;DR: In this article, the nonlinear dynamics of a simply supported functionally graded materials (FGMs) rectangular plate subjected to the transversal and in-plane excitations is presented in a thermal environment for the first time.

TL;DR: In this paper, an improved genetic algorithm is introduced to find the optimal placement of sensors, where the modal strain energy (MSE) and modal assurance criterion (MAC) were taken as the fitness function, respectively, so that three placement designs were produced.

TL;DR: In this paper, a semi-analytical finite element (SAFE) method is presented for analyzing the wave propagation in viscoelastic axisymmetric waveguides.

TL;DR: In this paper, a semi-analytical approach for nonlinear free and forced axisymmetric vibration of a thin circular functionally graded plate is developed, and the results show that the free vibration frequencies are dependent on vibration amplitudes, and that volume fraction index has a significant influence on the nonlinear response characteristics of the plate.

TL;DR: The implicit condensation method is improved by adding a step to recover membrane displacements using an estimated membrane basis, which demonstrates the viability of the proposed method.

TL;DR: In this paper, a boundary controller based on Lyapunov's direct method and the backstepping technique is proposed to reduce transverse motion of flexible marine risers driven by a hydraulic system at the top end of the risers under environmental disturbances induced by waves, wind, and ocean currents.

TL;DR: The reliability test proves that GAs lead to robust optima, and takes into account the most important parameters of micro-geometric modifications, namely tip and root relief, therefore the parameter space is eight dimensional.