Showing papers in "Journal of Sound and Vibration in 1985"

TL;DR: In this article, a higher-order shear deformation theory is used to demonstrate the natural frequencies and buckling loads of elastic plates, which accounts for parabolic distribution of the transverse shear strains through the thickness of the plate and rotary inertia.

TL;DR: In this article, a set of beam characteristic orthogonal polynomials in the Rayleigh-Ritz method was used to obtain the natural frequencies of rectangular plates. But the results for lower modes were not as good as those obtained by other methods.

TL;DR: In this paper, a systematic classification of flow interference regimes is linked to the observed vortex shedding responses for a wide range of arrangements, and all types of the fluid-elastic oscillations were related to the regions of interference.

TL;DR: In this paper, a model for the high-frequency vibration produced by a single point defect on the inner race of a rolling element bearing under radial load is extended to describe the vibrations produced by multiple points defects.

TL;DR: In this article, the relationship between damage location, damage size and the changes in the eigenvalues and eigenvectors of a cantilever when subjected to damage is investigated.

TL;DR: In this article, it was shown that the shedding frequency of the self-excited vortex shedding process is governed by a resonance-like mechanism, which leads to a bifurcation condition (direct resonance condition) of the local instability eigenvalue.

TL;DR: In this article, a two-parameter impedance versus frequency model was proposed to predict ground effect at long range and low frequency for grass-covered ground, bare ground, and layered forest floor when measured values of flow resistivity and porosity were used.

TL;DR: In this article, the authors examined the effect of variations in impulse response functions measured in different rooms and found that the response functions changed drastically with the variation of these recording parameters, indicating that signal dereverberation by impulse response deconvolution has limited scope in most practical situations.

TL;DR: In this paper, an elastic beam with one-sided amplitude constraint subjected to periodic excitation is considered and compared with results given by a theoretical model based on a single mode analysis of the beam following the work of Moon and Shaw.

TL;DR: In this paper, the problem of active suspension control of a two-degree-of-freedom vehicle travelling on a randomly profiled road is studied, where the suspension system is optimized with respect to ride comfort, road holding and working space of the suspension.

TL;DR: In this paper, the effects of mass ratio, coefficient of restitution, and gap size on the free vibrations were determined by simulating motion on the digital computer, and a single unit impact damper under free and forced vibrations was studied.

TL;DR: In this article, the bridge response is formulated in modal co-ordinates to reduce the number of equations to be solved within each time step, which reduces the complexity of solving the moving load problem.

TL;DR: In this paper, the frequency equation for the whole system is obtained in terms of the eigenvalues, or their natural logarithms, of the transfer matrix for a single periodic subsystem.

TL;DR: In this article, the principle and performance of a broadband active sound control system in an air conditioning duct is described, which is designed for industrial use, is self-adaptive thanks to a programmable digital filter.

TL;DR: In this article, the authors proposed a finite element method to solve the stationary form of the Fokker-Planck-Kolmogorov equation for the random response of a certain class of non-linear systems.

TL;DR: In this article, a detailed study of coaxial jets of mean velocity ratios (inner to outer) 0·15⩽λ−1 ⩽1 has been done and the mean and fluctuating properties within the outer and inner regions across the jet are presented.

TL;DR: In this paper, the effects of inner ring waviness and non-uniform diameters of the rolling elements on the vibration characteristics of a bearing were investigated, and a mixed theoretical and experimental impedance approach was used to treat the bearing.

TL;DR: In this article, a method of measuring the acoustic flow resistance and reactance of porous materials is described, and some illustrative experimental data are presented and discussed, with particular attention to the dependence of the flow resistance on frequency and wire diameter.

TL;DR: In this article, the non-linear vibration of immovably supported variable beams is considered, in which the geometric nonlinearity due to the axial force generated by stretching the middle surface is taken into account.

TL;DR: In this paper, a mathematical model of tone-excited jets is developed which consists of two major components: a mathematical description of the process by which the intrinsic instability waves of the jet are excited by the upstream tones; and the modeling of the nonlinear interaction between the mean flow of a jet, the excited large-scale instability waves or turbulence structure, and the fine scale turbulence.

TL;DR: In this article, the effect of an intermediate lateral spring support on the stability of a cantilevered tubular pipe conveying fluid was investigated and it was shown that providing the pipe with a spring support does not necessarily lead to stabilization and indeed is likely to have a destabilizing effect.

TL;DR: The theory of vibrations of a cylinder braced by circular T-section ribs spaced regularly along its length is presented in this paper, and transmission experiments to validate the theory have been carried out on a ribbed cylinder model and these are described in an accompanying paper.

TL;DR: In this paper, the structural response of structural elements to a simple harmonic, transverse excitation is considered, and the effects of both initial curvature and midsurface stretching are included; thus, the governing equations contain both quadratic and cubic terms.

TL;DR: In this paper, boundary integral equation (BIE) methods are described for the prediction of sound propagation from a line source over a flat plane of inhomogeneous impedance, and approximate methods which satisfy reciprocity are proposed for the calculation of the wave field over a two-impedance plane.

TL;DR: In this article, the in-plane vibrations of a rotating ring are investigated and the potential and kinetic energy functionals including the effects of extensional and shear deformation and of rotatory inertia respectively are derived.

TL;DR: In this paper, a finite element model of the beam transverse motion in the plane is formulated through the extended Hamilton's principle, and the stability of the model is investigated with respect to axial location and the inertia of the concentrated mass, the location of the follower force direction control sensor, the sensor gain and the magnitude of the constant follower force.

TL;DR: In this article, the authors describe the acoustic results from a well-controlled experiment designed to obtain an understanding of the noise generated by a tone-excited jet, with particular emphasis on the mechanism of broadband jet-noise amplification.

TL;DR: In this paper, a survey of the sound insulation between modern Swedish dwellings was made by the National Testing Institute in 1983, which comprised measurements and interviews with tenants in eight housing areas, brought up the old subject of discussion about how to measure and evaluate the impact sound insulation of floors.