Piston type underwater sound generator
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJulius Hagemann
Life of this patent
Estimating the term…
Abstract
1. An apparatus for producing low frequency compressional waves under water hich 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.
Claims3
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 in correspondingly varied.
Apparatus for generating sound under water comprising a frame, two equal area plates of rigid material resiliently mounted in spaced parallel relation on the frame, a plurality of hydraulic reciprocating motors orthogonally mounted between and so connected to the plates that the reciprocating movement of each of said motors is directly transmitted to the plates to vary their spacing, a plurality of hydraulic pumps, hydraulic lines connecting each pump to a separate motor, whereby each motor is enslaved to an individual pump, and means for driving all of the pumps in synchronism.
Dependencies are inferred from the claim text.