Showing papers in "Journal of Sound and Vibration in 2011"

TL;DR: In this paper, a non-resonant piezomagnetoelastic energy harvester with high-energy orbits was proposed and investigated over a range of excitation frequencies.

TL;DR: In this paper, a vibration isolation model for improving vibration isolation effectiveness of the vehicle seat under low excitation frequencies is proposed, which uses two symmetric negative stiffness structures (NSS) in parallel to a positive stiffness structure.

TL;DR: In this paper, an energy harvester consisting of a clamped-clamped piezoelectric beam bi-morph is considered and the shape of the harvesters' potential function is altered by applying a static compressive axial load at one end of the beam.

TL;DR: In this article, a chiral metacomposite is proposed by integrating two-dimensional periodic chiral lattice with elastic metamaterial inclusions for low-frequency wave applications.

TL;DR: In this article, the response of an inductive power generator with a bistable symmetric potential to stationary random environmental excitations is investigated, and the expected value of the generator's output power is independent of the potential shape.

TL;DR: In this paper, three simplified wave-packet models of the coherent structures in subsonic jets are presented, and the dependence of the radiated sound on the temporal variations of the amplitude and spatial extent of the modulations are studied separately in the first two model problems, being considered together in the third.

TL;DR: In this paper, the authors present reliable numerical and experimental approaches for designing, modelling and manufacturing an effective passive vibration damper using the acoustic black hole effect in Euler-Bernoulli beams.

TL;DR: In this paper, a dual-mass vibration energy harvester with two masses connected in series with the energy transducer and spring is proposed and analyzed, and the optimal parameters for maximizing the power output in both the traditional and the new configurations are discussed in analytical form while taking the parasitic mechanical damping of the system into account.

TL;DR: In this article, a unified approximation method is derived to illustrate the effect of electro-mechanical coupling on vibration-based energy harvesting systems caused by variations in damping ratio and excitation frequency of the mechanical subsystem.

TL;DR: In this article, a nonlinear extension of force appropriation techniques is developed in order to isolate one single NNM during the experiments, and the energy dependence of NNM modal curves and their frequencies of oscillation are then extracted from the time series.

TL;DR: In this paper, a three-layered symmetric sandwich beam with magnetorheological elastomer (MRE) embedded viscoelastic core and conductive skins subjected to a periodic axial load have been carried out under various boundary conditions.

TL;DR: In this paper, a flexural forced vibration of a cantilever beam having a transverse surface crack extending uniformly along the width of the beam was performed to relate the nonlinear resonances to the crack presence, location, and depth.

TL;DR: In this paper, the authors presented a time series analysis methodology to detect, locate, and estimate the extent of structural changes (e.g. damage) using Auto-Regressive models with eXogenous input.

TL;DR: In this article, two new breathing functions were identified to represent the actual breathing effect on the cracked element stiffness matrix, which were then used in formulating the time-varying finite element stiffness matrices of a cracked element.

TL;DR: In this paper, a relatively simple method for determining the electromechanical parameters of electromagnetic energy harvesters is presented, where the optimal power generated through a load resistor at both off-resonance and resonance is derived analytically.

TL;DR: In this paper, a critical review of information pertinent to the behaviour of stadia structures subjected to dynamic crowd loading is presented, which is intended to introduce and explain key concepts in the field as well as summarise the development of current guidance and methods for modelling and assessing crowd occupancy.

TL;DR: In this article, the current status of a computational aeroacoustics (CAA) approach to simulate broadband noise is reviewed, based on the use of steady Reynolds averaged Navier-Stokes (RANS) simulation to describe the time-averaged motion of turbulent flow.

TL;DR: In this article, the shape features of the full-field mode shapes of a composite panel are measured by a DIC system and predicted by a finite element (FE) model, which is then modified and updated.

TL;DR: In this paper, the Galerkin method was used to reduce the nonlinear forced vibrations of FGM doubly curved shallow shells with a rectangular base to a system of infinite nonlinear ordinary differential equations with quadratic and cubic nonlinearities.

TL;DR: In this paper, a new source detection algorithm based on L1 generalized inverse techniques was developed to resolve coherent/incoherent, distributed/compact, and multipole aerodynamic-sound sources with phased-array pressure data.

TL;DR: In this article, a structural topology optimization for minimizing frequency response is proposed based on the level set method, where the sensitivity analysis with respect to the structural boundaries is carried out, while the Extended finite element method (X-FEM) is employed for solving the state equation and the adjoint equation.

TL;DR: In this paper, the authors analyzed the brake squeal data obtained from a full brake system on a noise dynamometer with nonlinear analysis techniques and showed that lower dimensional attractors are isolated and quantified by dynamic invariants such as correlation dimension estimates or Lyapunov exponents.

TL;DR: In this article, the correlation analysis between the time-averaged friction coefficient and peak sound pressure data is performed by applying a semblance analysis and a joint recurrence quantification analysis.

TL;DR: In this article, an improved bearing model is developed in order to investigate the vibrations of a ball bearing during run-up, with the assumption that the inner race has only 2 DOF and that the outer race is deformable in the radial direction.

TL;DR: In this paper, the authors analyzed the nonlinear vibration of an axially moving beam subject to periodic lateral force excitations, and they used the incremental harmonic balance (IHB) method to evaluate the non-linear dynamic behavior of the beam.

TL;DR: In this paper, the authors derived the partial differential equation of motion for the transverse deflection of a rotating pre-twisted plate by considering it as a plate of an equivalent rectangular cross-section subjected to a quasi-static load due to a centrifugal force field.

TL;DR: In this article, the authors examined how the dynamics of a cantilevered pipe with additional spring-support is modified by the presence of a small mass attached at the free end.

TL;DR: In this article, a comprehensive experimental analysis of lateral forces generated by single pedestrians during continuous walking on a treadmill was presented, both in terms of mean values and probabilistically to illustrate the randomness associated with intra-and inter-subject variability.

TL;DR: In this paper, two different approaches: equivalent loads minimization and vibration minimization method are applied for the identification of unbalance fault in a rotor bearing system by minimizing difference between equivalent loads estimated in the system due to the fault and theoretical fault model loads.

TL;DR: In this article, the role of acoustic feedback instabilities in the tonal airfoil self-noise phenomenon is investigated, and a linear stability analysis of the time-averaged boundary layer profiles is performed.