Showing papers in "Journal of Sound and Vibration in 1976"

TL;DR: In this article, a theoretical method for calculating far field noise from an airfoil in an incident turbulent flow is extended to apply to the case of noise produced by turbulent flow past a trailing edge, and some minor points of the theory in reference are clarified.

TL;DR: In this paper, a theoretical and experimental study of the aeroelastic instability of a panel with various boundary conditions on its leading and trailing edges, exposed to air flow over its upper surface or on both sides.

TL;DR: In this paper, the authors discuss methods for the measurement of structural wave intensities associated with various points in a wave field and show how the procedures for intensity measurements can be simplified in some special cases.

TL;DR: In this article, a system was developed for real-time sound source location on full-size jet engines, consisting of an array of microphones connected to a small digital computer, via a sequence of preamplifiers, analog filters and analog to digital converters and multiplexer.

TL;DR: In this paper, a survey dealing with the effects of road traffic noise, 2933 persons resident at 53 sites in Greater London were interviewed, noise levels at the dwelling facades were measured and the volume and composition of the traffic at each site were counted.

TL;DR: A review of the current state of the art of ground vibration propagation is presented in this article, where the theoretical models of vibration attenuation are reviewed and then measurement techniques are discussed, whose validity is discussed.

TL;DR: In this paper, the existence and stability of solutions of Dufng's equation are investigated and their characteristic bifurcations are studied, and it is shown how catastrophe theory provides a natural synthesis between the practical and theoretical aspects of the problem.

TL;DR: In this paper, the authors compared rotor spectra from a variety of axial flow machines and acoustic trends examined, and found that the minimum broad band noise generated by ducted and free field rotors corresponds to laminar and turbulent boundary layer shedding.

TL;DR: In this article, a twenty node, isoparametric acoustic finite element model is developed for analysing the acoustic modes of irregular shaped cavities, which is first used to analyse a rectangular enclosure.

TL;DR: In this article, a jet noise model is developed which takes account of acoustic-mean flow interaction, for which the governing equation is Lilley's equation, and numerical solutions are obtained for sources representative of turbulent mixing noise.

TL;DR: In this article, the wake interaction effects between two identical flexible circular cylinders in flowing water were examined and the stability of the two cylinders was explained by reference to oscillatory mode shapes and from considerations of two possible types of vortex shedding (symmetric and alternate).

TL;DR: In this paper, a model is presented for the intense pure-tone noise generated by American subway cars and German trams when traversing tight curves, which is assumed to arise from lateral crabbing of the wheels across the rail head, which results from the finite length of the truck or bogie.

TL;DR: In this article, analytical formulas for predicting wheel/rail rolling noise in urban rail transit systems are developed based on the characterization of the wheel and rail dynamic system developed in Part I and the roughness spectra on the running surfaces of the wheels and rails.

TL;DR: In this paper, a mathematical model for sound transmission into a stiffened cylindrical shell was presented for a typical narrow-bodied jet in cruising flight, where the stiffening effect of the ring frames and stringers was approximated by a'smeared-stiffener theory which includes the eccentricity of the stiffeners.

TL;DR: In this paper, the point impedance, response, radiation efficiency, and directivity of steel wheels and rails are compared with appropriate analytical models, and field and laboratory measurements of the wheel and rail impedance are presented.

TL;DR: In this article, the authors summarized the research work done by various experimenters during the last fifteen years in which an attempt was made to reduce the generated sound by modifying the fan itself.

TL;DR: In this paper, the effect of longitudinal or inplane deformation and inertia on the flexural frequency-amplitude relationship was investigated for the case of thin and circular plates.

TL;DR: In this paper, the authors investigated the non-stationary random vibration of a beam and concluded that the resulting beam vibration turns out to be a nonstationary process even though the motion considered is that of a stationary random force.

TL;DR: In this paper, the first three eigenfrequencies with different values of stiffness ratios (ratio of spring stiffness and beam stiffness at either end) and taper ratio are presented.

TL;DR: A subjective rating scale for their quantitative assessment was used with success to differentiate between a limited number of sounds of varying harmonic content and a quantitative measure of the suitability of selected words for timbre was obtained.

TL;DR: In this article, the authors used a variational principle to set up the forced harmonic motion of a damped acoustic system and then used a computer program to study the transmission loss and insertion loss performance of some expansion chamber mufflers.

TL;DR: In this paper, a theoretical study of the acoustic modes of a two-dimensional rectangular cavity is presented, and the physical significance of strong radiation damping on the onset of cavity tones induced by outside flow at low Mach number is discussed.

TL;DR: In this article, a method for the prediction of dynamic characteristics of rectangular plates with cutouts is described, based on the use of variational principles in conjunction with finite difference technique.

TL;DR: In this article, a variational technique has been used to minimize the total energy of the stiffened plate and the derivatives appearing in the energy functional are replaced by finite difference equations, taking into account inplane deformation of the plate and stiffener and the effect of inplane inertia on the natural frequencies and mode shapes.

TL;DR: In this paper, large amplitude asymmetric vibrations of shells of revolution are analyzed by using a finite element method and Sanders' non-linear strain displacement relations are used to derive the element stiffness matrix.

TL;DR: In this article, the flexible rotating shaft of a turbo-rotor is treated by finite element analysis, and a receptance formulation is introduced into the rotor equations via a manifold.

TL;DR: In this article, the general multiple input/output problem involving arbitrary stationary random processes is solved by using a special representation for random records, which is relatively simple to understand and to compute compared to previously known least-squares methods.

TL;DR: In this article, the first symmetric and antisymmetric free vibration modes of a cantilever plate for a wide range of aspect ratios were analyzed using the method of superposition.

TL;DR: In this paper, an improved procedure for predicting noise levels L 10 from road traffic was developed for use within England and Wales in connection with the Noise Insulation Regulations 1975 and for other aspects of planning.