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7.—Acoustic Diffraction by an Absorbing Semi-Infinite Plane in a Moving Fluid, II*

Published online by Cambridge University Press:  14 February 2012

A. D. Rawlins
A. D. Rawlins
Affiliation:
Department of Mathematics, University of Dundee.
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Synopsis

The diffraction of a line source by an absorbing semi-infinite plane in the presence of a subsonic fluid flow is examined. Expressions for the total far field for the leading edge (no wake present) and the trailing edge (wake present) situation are given.

It is found that the presence of fluid flow attenuates the sound level in the shadow region of the absorbent screen. There is greater attenuation of the sound level in the trailing edge situation than there is for the leading edge situation.

Sound level attenuation on the source side of the absorbent screen is found to depend more critically on the absorptive properties of the screen than on the fluid flow. The radiated sound intensity, in the half space in which the source is located, can be considerably reduced by a suitable choice of the absorption parameter.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 75 , Issue 2 , 1976 , pp. 83 - 95
Copyright
Copyright © Royal Society of Edinburgh 1976

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References

REFERENCES

1Rawlins, A. D.. Proc. Roy. Soc. Edinburgh Sect. A 72 (1975), 337–357.Google Scholar
2Jones, D. S.. J. Inst. Math. Appl. 9 (1972), 114.CrossRefGoogle Scholar
3Morse, P. M. and Ingard, K. U.. Encyclopedia Phys., Acoustics I. (Berlin: Springer, 1961).Google Scholar
4Rawlins, A. D. (Univ. Surrey Ph.D. Thesis, 1972).Google Scholar