Anechoic coating for acoustic waves

Details Anechoic coating for acoustic waves Anechoic coating for acoustic waves

1988-10-26

1989-11-28

Fuller, B. R.

Acoustics

Sound-modifying means

Sound absorbing panels

181175, 181207, 181288, 181290, E04B 182

Patent

active

048831433

ABSTRACT:
To manufacture an anechoic coating which prevents a wall from reflecting acoustic waves, the wall is coated with an elastic material of low compressibility, which is highly absorbent under shear stresses, and then with a highly compressible layer of material. A set of plates covers the second layer and vibrates under the effect of the acoustic waves. Rods fixed to these plates transmit these vibrations to the first layer which is thus subjected to shear stresses and dissipates the energy of the vibrations, thus making it possible to avoid the sonar detection of submarines.

REFERENCES:
patent: 2830780 (1958-04-01), Schloss
patent: 3038551 (1962-06-01), McCoy et al.
patent: 3120875 (1964-02-01), Graner
patent: 3123176 (1964-03-01), Greenberg
patent: 3160549 (1964-12-01), Caldwell et al.
patent: 3330376 (1967-07-01), Warnaka
patent: 4197920 (1980-04-01), Cluzec et al.
Patent Abstracts of Japan, vol. 9, No. 111, (M-379) [1834], May 15, 1985 & JP- 59231240, 12/25/1984, Vibro-Isolating Member Kumazawa.

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