Efficient apparatus for projecting acoustic waves

Details Efficient apparatus for projecting acoustic waves Efficient apparatus for projecting acoustic waves

1977-01-10

1979-02-27

Tudor, Harold J.

Communications: electrical

Selective

Pulse responsive actuation

340 8R, 340 8PC, H04B 1300

Patent

active

041421710

ABSTRACT:
In an apparatus for projecting low-frequency acoustic waves in a liquid ma, a chamber adapted to be immersed in the media contains gaseous material to provide a compliance and is provided with an aperture. A piston of selected mass is sealably mounted in the aperture, having one end adapted to displace a selected mass of the liquid media and the other end adapted to displace the gaseous material in the chamber. An actuating device is coupled to the piston for reciprocating it at the resonant frequency of a mechanical system which substantially comprises the compliance provided by the contained gaseous material, the mass of the piston, and the mass of the displaced liquid media.

REFERENCES:
patent: 2405179 (1946-08-01), Belack, Jr. et al.
patent: 2505519 (1950-04-01), Beranek
patent: 2802196 (1957-08-01), Fry et al.
patent: 3137835 (1964-06-01), Bielecki et al.
patent: 3676840 (1972-07-01), Baip
patent: 3760346 (1973-09-01), Kieser et al.
patent: 3803544 (1974-04-01), Wallen
patent: 4001765 (1975-03-01), Sims
patent: 4030063 (1977-06-01), Wallen

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