Showing papers in "Journal of Sound and Vibration in 1972"

TL;DR: In this article, the authors presented an efficient method for digital simulation of general homogeneous processes as a series of cosine functions with weighted amplitudes, almost evenly spaced frequencies, and random phase angles.

TL;DR: In this paper, an efficient and practical method of simulating stationary and non-stationary random envelope processes is presented, in which the stationary envelope processes are simulated by using the fast Fourier transform while the nonstationary envelope process is simulated as the square root of the sum of a series of cosine functions with random phase angles.

TL;DR: In this article, an extended theory is described which includes the effects of motion of mass particles inside the resonator, and a general formula involving shape of the vessel is derived, which is valid not only for Helmholtz resonators but also for such different shapes as a closed branched tube or λ 4 resonator.

TL;DR: In this article, the authors present a theory for its analysis which is based on Flugge's equations for the description of shell motion and a classical potential-flow theory for the coupled hydrodynamic forces.

TL;DR: In this paper, a simple model of jet structure, purporting to explain the particular phase relationships between fluctuating pressure and the components of the fluctuating velocity obtained here, is postulated.

TL;DR: In this article, a Timoshenko beam finite element based on exact differential equations of an infinitesimal element in static equilibrium is presented, and convergence tests are performed for a simply-supported beam and a cantilever.

TL;DR: In this article, it is shown that the far field sound pressure is directly proportional to the first Eulerian time derivative of the chemical reaction rate integrated over the reacting volume, and the characteristics of the correlation function for this reaction rate time derivative are investigated through elementary reasoning for several simple premixed turbulent flame models.

TL;DR: In this article, the radiation impedance of circular and oblong holes in the wall of a flow duct has been measured as a function of the flow velocity, and it has been shown that at low Strouhal numbers (quasi-static case) and constant boundary layer thickness, the flow resistance of the orifice (real part of the impedance) increases in proportion to flow velocity.

TL;DR: In this paper, a general and rather simple theory of active absorption is given and applied to sound waves in an air duct, and some preliminary experiments are also reported and discussed, but the experimental results are limited.

TL;DR: In this article, the turbulence structure of a circular air jet was studied by correlating both full and narrow-band signals from locally displaced microphone probes and a high degree of statistical interdependence was found for the pressure in planes normal to the axis, and in particular for frequency components at St = 0·5 where the bulk of the fluctuating near-field energy is concentrated.

TL;DR: In this article, the authors derived the eigenvalue equation in the presence of uniform flow by matching the pressure and the radial component of the velocity at the interface between the regions of uniform and shear flow.

TL;DR: In this article, an expression for the cumulant generating function of the multi-dimensional response of a linear system to Poisson distributed random impulses is obtained, which enables estimates to be made of the joint probability distribution of the response, when the latter is slightly non-Gaussian.

TL;DR: In this article, Tetrahedral and cuboid finite elements with a linear variation of the pressure between the nodes are used for finding the natural frequencies and modes of an acoustic enclosure, which converges to the exact solution as 1 1 1/N2 where N is the order of a three-dimensional grid.

TL;DR: In this article, a method for predicting the behavior of sound propagating in a circular duct of continuously varying cross-sectional area was developed, where an approximation is made to the duct shape by a series of subsections whose sides are parallel to the axis of the duct.

TL;DR: In this article, the authors present an investigation on annoyance due to aircraft noise exposure and demonstrate that the extent of annoyance reactions in an exposed population is closely correlated to the noise level of single overflights.

TL;DR: In this article, a review of several problems arising from the mutual interaction of elastic waves and nonstationary temperature fields in solid continua is presented, with particular attention given to uncoupled theories, where such interaction occurs as a result of the temperature dependence of the physical properties.

TL;DR: In this article, the authors used the mechanical impedance measurement technique to obtain data necessary to determine the vibration characteristics of the human hand and derived the values of the masses, springs and dampers for an equivalent mass-spring-damper system which simulates the dynamic response of the hand.

TL;DR: In this paper, a tentative personality profile of a noise sensitive individual is proposed and some support for this is found from noise annoyance field studies and from individual loudness function data, suggesting that in order to predict an individual's annoyance to a particular noise it is necessary to know not only the level of the noise but also his personality.

TL;DR: In this article, the possibilities of and limitations on direct fluctuating pressure measurements in turbulent flows are discussed, and the error mechanisms of insertion of pressure probes into the flow are analyzed analytically.

TL;DR: In this article, the basic work of Stokes, Kirchoff and Rayleigh on fluctuating motions in fluids is recalled and developed to provide a firm basis for the critique of Lighthill's theory.

TL;DR: In this article, the spectral condition number of the stiffness and mass matrices was studied for discretization and intrinsic parametrization of fourth-and second-order field problems.

TL;DR: In this paper, an extension of the data in the low-frequency range down to 3·15 Hz, at l levels from threshold to 70 phon, was presented, which corresponds to nearly 140 dB sound pressure level at the lowest frequency.

TL;DR: In this paper, a series composed of multiplications of beam functions are used in the Ritz method to derive frequency and buckling-equations for rectangular plates which are subject to arbitrary inplane stresses and have any combinations of fixed, free or simply supported edges.

TL;DR: The specific damping capacity of a wide range of engineering metals has been determined at direct cyclic stresses up to the fatigue limit as discussed by the authors, where the energy dissipation was determined from the rate of rise of temperature at different sections of the specimen.

TL;DR: In this paper, the total power and power spectrum due to a point source convecting at a uniform subsonic velocity along the axis of a round jet is calculated, where the source is a discrete frequency source in its own frame of reference.

TL;DR: In this article, a finite element analysis with respect to the effect of transverse shear deformation for honeycomb sandwich beams is described. The analysis presented is quite general in the sense that flexural modes, in-plane and shearing motion can be readily obtained.

TL;DR: In this article, an analysis of the sound field in the combustion can is presented in which the axial temperature and density gradients are taken into account, and the analysis includes calculation of the acoustic transfer impedance at the burner plane.

TL;DR: In this article, a constant curvature beam finite element based on thin beam theory is shown to converge onto exact frequencies, and the element which allows shear deformation and rotary inertia is given by more accurate finite element analysis providing the correct value of shear coefficient is used.

TL;DR: In this paper, the stiffness matrix of a layer element is obtained by assuming the displacement functions, u, ν and w to be of the form X ( x ) Y ( y ) Z ( z ), in which X( x ) and Y( y ) are suitable beam function series satisfying the appropriate boundary conditions of the plate.