Sound damping arrangement

Details Sound damping arrangement Sound damping arrangement

1994-11-03

1996-04-30

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Sonar counter-measures

114270, H04K 300

Patent

active

055131492

ABSTRACT:
Underwater sound from a marine vessel driven by one or more propellers is damped by introducing air and/or other gas into the vessel's propeller flow(s) so that the turbulence of the propeller flow(s) causes mixing of the air/gas and water and disintegration of gas bubbles. The majority of the gas bubbles formed in the water are from 1 to 20 mm in diameter.

REFERENCES:
patent: 1348828 (1920-08-01), Fessenden
patent: 3084651 (1963-04-01), Parmenter
patent: 4135469 (1979-01-01), Rimppi et al.
patent: 4979917 (1990-12-01), Haynes
patent: 5036781 (1991-08-01), Jarvi
patent: 5074813 (1991-12-01), Jarvi et al.
Red Storm Rising, Tom Clancy, Berkley Books, 1986, p. 182.
Patent Abstracts of Japan, vol. 11, No. 64(M-565) Feb. 26, 1987 and JP 61 220 997 (Mitsui Eng. & Shipbuilding Co.) Oct. 1, 1986 (English abstract).

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