Showing papers in "Journal of Sound and Vibration in 1982"

TL;DR: In this article, the propagation of vibrations in structures with some degree of extended disorder, i.e., departure from regularity or strict periodicity extended throughout the structure, is discussed, and an account is given of the phenomenon of normal mode localization, caused under certain circumstances by the disorder.

TL;DR: In this paper, a deceptively simple difference equation is derived which approximately describes the motion of a small ball bouncing vertically on a massive sinusoidally vibrating plate, and the equation reduces to the standard mapping which has been extensively studied by physicists in connection with the motions of particles constrained in potential wells.

TL;DR: In this article, the authors derived a scaling formula that the intensity of shock associated noise varies as (Mj2 − Md2)2 where Mj and Md are the fully expanded jet operating Mach number and nozzle design Mach number, respectively.

TL;DR: In this article, the dispersion behavior and energy distributions of free waves in thin walled cylindrical elastic shells filled with fluid are investigated, and a non-dimensional equation which determines the distribution of vibrational energy between the shell wall and the contained fluid is derived.

TL;DR: In this paper, a brief review of the formulation of the finite element method for structural-acoustic analysis of an enclosed cavity, and illustrations are given of the application of this analytical method at General Motors Corporation to investigate the acoustics of the automobile passenger compartment.

TL;DR: In this paper, the free vibrations of beams containing split regions are investigated and the frequency determinant is obtained by satisfying continuity conditions at junctions between end regions and interior regions immediately next to the end regions.

TL;DR: In this paper, the equations of motion for aeroelasticity of plates and shells are well established and results obtained by numerical time integration have been compared to those obtained by topological theories of dynamics and also from experiment.

TL;DR: In this paper, the authors compare the theories of flexural vibration of damped, three-layer sandwich beams as presented by Yan and Dowell, and by DiTaranto and Mead and Markus.

TL;DR: In this paper, the authors compare the responses to various types of environmental noise, such as road traffic and aircraft, with the responses expressed in a railway noise survey, and find that railway noise is less annoying than other noises at any given high noise level.

TL;DR: In this paper, a theory for the small amplitude free vibration of thick, circular cylindrical shells laminated of bimodulus composite materials, which have different elastic properties depending upon whether the fiber-direction strain is tensile or compressive.

TL;DR: In this paper, the frequency and mode shapes of a cantilever beam with a base excitation and tip mass whose center of gravity does not coincide with the point of attachment are derived.

TL;DR: In this paper, the free vibration of a truncated conical shell with variable thickness was analyzed by using the transfer matrix approach, and the effects of the semi-vertex angle, truncated length and varying thickness on the vibration were studied.

TL;DR: In this article, a non-linear softening Belleville spring is used in the absorber of a linear passive dynamic vibration absorber and the suppression bandwidth can be doubled by this means.

TL;DR: In this paper, a theory of regeneration of musical notes by the interaction between the lips of a player and a brass wind instrument is presented. Butler et al. show that many of the important parameters controlling the interaction can vary over a wide range and are under the complete control of the player.

TL;DR: In this paper, the exact dynamic stiffness matrix for a straight and uniform beam element whose elastic and inertial axes are not coincident is derived for planar assemblages of connected bending-torsion beams.

TL;DR: In this article, a finite element based on a Reissner-Mindlin type of shear deformable theory governing laminated anisotropic composite plates, and the nonlinear (large rotations) strain-displacement relations of the von Karman theory are employed.

TL;DR: In this article, the general mobility matrix formulation of the problem of multi-point, coupled structures is discussed and some of the disadvantages are emphasized and some useful approximations of these quantities are derived.

TL;DR: In this paper, a parametrically excited pendulum hinged to the mass is considered and two types of restoring forces on the pendulum are considered, and the method of harmonic balance is used to evaluate the system response.

TL;DR: In this paper, a theoretical method for studying vibrational energy transmission in coupled structures, which differs radically from the previous statistical energy analysis (S.E.A.) studies, is presented.

TL;DR: In this article, the dampers are characterized by means of a 2×2 complex impedance matrix which can be experimentally determined in the laboratory and which includes the effects of the rotatory motion of the clamp.

TL;DR: The effects of railway noise on residents have been measured with a combined social survey (1453 respondents) and noise measurement survey (over 2000 noise measurements) at 403 locations in 75 study areas in Great Britain this paper.

TL;DR: In this article, the authors derived a formula for the high frequency sound emission from moving point multipole sources embedded in an arbitrary unidirectional transversely sheared mean flow.

TL;DR: In this paper, body movements during sleep and subjective sleep quality, as well as mood and performance were investigated after exposure to intermittent and continuous traffic noise during the night, and the results suggest that increased attention should be paid to peak noise levels when standards for nocturnal noise are set.

TL;DR: In this paper, it has been shown that there is only a single frequency spectrum for the transverse vibrations of the Timoshenko beam and not two distinct spectra of frequencies, as has been claimed by a number of prior authors for the case of the simply supported beam.

TL;DR: In this article, explicit formulae are given for both the far field radiation and the sound reflected back up the pipe for an incident plane wave, which are valid to second order in the ratio of duct diameter to wavelength, in excellent agreement with Munt's exact numerical computations.

TL;DR: In this article, a method for modal tests on individual components of complex engineering structures where interest is confined to deriving an undamped model of the structure is proposed. But the method is simple to program and its application to various practical structures is described.

TL;DR: In this article, the authors compared five different energy summation models for predicting annoyance reactions in mixed source situations and found that the simple summation model gave the poorest prediction of average annoyance.

TL;DR: In this paper, an experimental investigation has been carried out for acoustic oscillations sustained by flow through a duct containing two baffles, and the conditions are such as to ensure close coincidence between the frequency of vortex shedding from the forward baffle and a natural frequency of the duct.

TL;DR: In this article, the vibrational energies of two thin plates coupled in an L shape were calculated using a vibrational energy model. But the results were not compared with results from a computerized experiment, in which special attention was given to the number and position of point velocity measurements.