Accession Number : ADD004620

Title :   Piston Type Underwater Sound Generator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Hagemann,Julius

Report Date : 06 Sep 1977

Pagination or Media Count : 4

Abstract : An apparatus for producing low frequency compressional waves under water which comprises two circular plates spaced in opposed parallel relation, a plurality of reciprocating fluid motors arranged in parallel between said plates, an independent fluid pump hydraulically connected to each of said motors for driving the same, a by-pass valve for each motor adjustable to vary the length of the stroke of such motor, a prime mover coupled to drive all of the pumps in synchronism, whereby the motors connected thereto reciprocate in unison to move said plates toward and away from each other at a frequency corresponding to the speed of the prime mover, and means for adjusting all of the by-pass valves in assembly, whereby the amplitude of oscillation of said plates is correspondingly varied. (Author)

Descriptors :   *Patents, *Underwater sound generators, Low frequency, High intensity, Pistons, Reciprocating engines, Hydraulic cylinders, Bearings, Pumps

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE