Showing papers in "Journal of Sound and Vibration in 1999"

TL;DR: In this article, the full development and analysis of four models for the transversely vibrating uniform beam are presented, including the Euler-Bernoulli, Rayleigh, shear and Timoshenko models.

TL;DR: In this paper, the authors investigated the application of the change in modal curvatures to detect damage in a prestressed concrete bridge and proposed a damage indicator called "curvature damage factor".

TL;DR: In this paper, the problem of using measured modal parameters to detect and locate damage in plate-like structures is investigated, and a method based on the changes in the strain energy of the structure is discussed.

TL;DR: In this article, the frequency response function (FRF) curvature method is proposed for structural damage detection, which is based on only the measured data without the need for any modal identification.

TL;DR: In this article, the propagation of vibration generated by a harmonic or a constant load moving along a layered beam resting on the layered half-space is investigated theoretically in a railway track, where the ground is modelled as a number of parallel viscoelastic layers overlying an elastic half space or a rigid foundation.

TL;DR: A detailed overview of the state of the art in the field of supersonic jet screech can be found in this paper, including a historical perspective, a summary of recent developments and a critical assessment of the current state-of-the-art.

TL;DR: In this article, a new technique is proposed for calculating natural frequencies of a vibrating beam with an arbitrary finite number of transverse open cracks, and the main feature of this method is related to decreasing the dimension of the matrix involved in the calculation.

TL;DR: A review of some definitions of noise annoyance which have been used explicitly or implicitly in major files and laboratory studies in different countries can be found in this paper, where the two aspects rated highest in similarity to annoyance are "nuisance" and "disturbance".

TL;DR: In this paper, the dynamic response of an axially accelerating, elastic, tensioned beam is investigated, where the time-dependent velocity is assumed to vary harmonically about a constant mean velocity.

TL;DR: In this article, a model for the propagation of vibration in the ground from a stationary oscillating load applied via a railway track structure is presented, which includes the track as an infinite layered beam structure resting on a ground made up of infinite parallel homogeneous elastic layers.

TL;DR: In this article, the authors investigated the non-linear dynamics and stability of simply supported, circular cylindrical shells containing inviscid incompressible fluid flow, and showed that the system loses stability by divergence.

TL;DR: In this article, the effects of transverse normal stress on the vibration of double curved shells were evaluated by comparing constant, linear and higher order distributions of transversal displacement components in the plate thickness directions.

TL;DR: In this article, a review is made of the diffraction theory of the trailing edge noise generated by a flat-plate airfoil of zero-thickness and non-compact chord, according to which the sound is attributed to the scattering of a frozen pattern of turbulence wall pressure swept over the edge in the mean flow.

TL;DR: In this paper, a general model based on Hamilton's principle and spectral analysis was developed for non-linear free vibrations occurring at large displacement amplitudes of fully clamped beams and rectangular homogeneous and composite plates.

TL;DR: In this paper, the vibrational states experienced by the active components of a drilling assembly such as that found in the oil or gas industry are discussed in the context of an integrated mathematical model.

TL;DR: In this paper, an analytical expression for the unsteady loading, acoustic mode amplitude, and sound power output of a three-dimensional rectilinear cascade of blades with finite chord excited by a three dimensional gust was obtained.

TL;DR: In this article, a theoretical method for predicting the absorption of an open weave textile or a micro-perforated membrane is presented. But no theory has been given for their combination, such as a glass-fibre textile or an MPR mounted over an airtight cavity.

TL;DR: In this article, the authors examined how friction-induced self-excited oscillations are affected by high-frequency external excitation and derived simple analytical approximations for predicting the occurrence of self excitation for the traditional mass-on-moving-belt model.

TL;DR: In this paper, a non-linear response of empty and fluid-filled circular cylindrical shells to harmonic excitations is investigated, and the boundary conditions on radial displacement and the continuity of circumferential displacement are exactly satisfied.

TL;DR: In this paper, the natural frequency and vibration mode sensitivities to system parameters are rigorously investigated for both tuned (cyclically symmetric) and mistuned planetary gears, including support and mesh stiffnesses, component masses, and moments of inertia.

TL;DR: In this article, the root mean square acceleration response (RMSAR) of a vehicle dynamic system subjected to actual random road excitations is obtained so as to account for the effect of the actual PSD of road excitation and the frequent changes in vehicle velocity.

TL;DR: In this article, a more general approach, employing many terms of a Fourier series to simulate the continuous fatigue cracks, was proposed to detect the presence of cracks in structural members.

TL;DR: In this paper, the acoustic attenuation performance of circular expansion chambers with extended inlet/outlet was investigated and three approaches were employed to determine the transmission loss: (1) a two-dimensional, axisymmetric analytical solution for the concentric configuration; (2) a three-dimensional computational solution based on the substructure boundary element-transfer impedance matrix technique; and (3) experiments on an extended impedance tube set-up with expansion chambers fabricated with fixed inlet, outlet, and chamber diameters, and varying lengths for the extended ducts and the chamber

TL;DR: In this article, a simplified method of evaluating the fundamental frequency for the bending vibrations of cracked Euler-Bernouilli beams is presented based on the well-known approach of representing the crack in a beam through a hinge and an elastic spring, but here the transverse deflection of the cracked beam is constructed by adding polynomial functions to that of the uncracked beam.

TL;DR: In this paper, the authors investigated the effect of the region of separated flow close to the trailing edge of an aerofoil on the stability of the boundary-layer flow over the aero-oil.

TL;DR: In this article, a vehicle-track model was developed to describe the short-term system dynamics of an ICE-1 carriage while running on an elastic track, disturbances by wheel radius deformations are assumed.

TL;DR: In this article, Finite Element analysis of a rotor system for flexural vibrations has been considered by including a shaft with two open cracks and the influence of one crack over the other for eigenfrequencies, mode shapes and for threshold speed limits has been observed.

TL;DR: In this paper, a closed-form solution can be obtained to identify moving constant loads, while numerical methods must be used to identify the time-varying moving loads, and the set of equations leading to the solution is based on Euler's equation of beams.

TL;DR: In this article, the periodic motions of a non-linear geared rotor-bearing system are investigated by the incremental harmonic balance (IHB) method, and a path following procedure using arc length continuation technique is used to trace the bifurcation diagrams.

TL;DR: In this paper, a control mechanism designed to significantly ameliorate the sustained excitation of torsional relaxation oscillations (slipstick) due to frictional torques generated by an active bit during drilling operations with an extended drill-string is presented.