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Research Article Open Access

REVISITING THE DEPENDENCE OF SOUND TRANSMISSION ON THE ANGLE OF INCIDENCE AT THE INTERFACE BETWEEN MEDIA OR MASSIVE LAYER

Abstract

Problems related to sound transmission through the interface between media and plates are the most popular in technical and architectural acoustics. The problems concerned normal incidence of sound have long been solved, while results obtained are confirmed by experiments and widely used in practice. Theoretical solutions to the problem of oblique sound incidence have not received direct experimental confirmation, and therefore a number of auxiliary theories were proposed during the last century allowing bringing together the results of calculation and experiment. In this article we consider the problem of the transmission of plane harmonic wave through a planar interface of a liquid or gaseous non- viscous media, as well as through the plates, showing a systemic error in the solutions to the problems of oblique transmission of sound. This error is caused by the fact that just the oscillation speeds of the incident, reflected, and transmitted waves were taken into account when carrying out calculations. The fact of variations in cross-sections of the sound rays in the incident and refracted waves depending on the incidence and refraction angles and, hence, variations in the ratios of the masses, encompassed in the oscillatory process, were not taken into account. The proposed physical model of the sound transmission takes into account in equal measure both factors: the vector of oscillatory speed and the variation in the cross section of the sound ray. The model is based on the momentum and kinetic energy conservation laws. The results of calculations according to the proposed model are well confirmed by practice. Jr. of Industrial Pollution Control 33(1)(2017) pp 878-882 www.icontrolpollution.com Research *Corresponding

ZAKHAROV. A.V

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