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Expendable-underwater-acoustic-projector

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(i) Aims of the Invention Accordingly, it is an object of this invention to provide an improved ...

Golf driver with variable weighting for changing center of gravity

OF THE INVENTION Referring now to the Figures, a preferred embodiment of the invention is ...

Expendable underwater acoustic projector

Details

Inventors: Hanson, Paul A.; Walton, James M.;
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Examiner: Tudor; Harold J.
Assistant Examiner:
Attorney, Agent or Firm: Beers; R. F., Johnston; E. F., Keough; T. G.

An expendable sound source provides a cost effective projection of acoustic nergies in the ocean. A tubular housing contains a d.c. motor that locates its shaft coaxial with the housing. Cylindrically-shaped camming blocks engage spurs in a pair of rigid pistons at both ends of the tubular housing to reciprocate them in accordance with the pattern of the camming surfaces and the motor speed. A flywheel on the shafts and journaling supports assure the projection of arbitrary waveforms and a key-and-keyway cooperation between the housing and prevents the pistons turning in the housings. A self-contained, high energy battery pack is actuated by magnetic reed switch to assure reliable long term projection after deployment. Pressure compensation can be included.

DETAILED DESCRIPTION The present invention is directed to providing an expendable apparatus for projecting acoustic energy through a water medium.
An elongate tube is disposed in the water medium for providing a protective enclosure that has a pair of openings at its opposite ends.
A motor having a power pack is carried within the elongate tube and is provided with a bidirectionally extending shaft.
A rigid projection piston is disposed in each of the openings and a camming means is operatively associated with each end of the bidirectional shaft and a rigid projection piston so that the rigid projection pistons are cammed in coincident diverging and coincident converging reciprocal excursions which are preestablished as an arbitrary waveform pattern on the camming surfaces.
A flywheel, journaling supports, appropriate sealing and pressure compensation assures the projection of the arbitrary waveforms of acoustic energy for prolonged periods of time and with great reliability.
Modification of the camming surfaces can provide variety in the projected acoustic energy.
A prime object of the invention is to provide an improved, expendable projector of acoustic energy.
Yet another object of the invention is to provide an expendable projector employing a motor having a bidirectionally extending shaft for simultaneous reciprocal excursions of a pair of projection pistons.
Yet another object of the invention is to provide an expendable projector employing rotary camming surfaces for projecting an arbitrary waveform of acoustic energy.
Still another object of the invention is to provide an expendable projector having flywheels, journaling supports, and sealing arrangements to assure reliable long term operation.
Yet another object is to provide an expendable source including the provision for pressure compensation for improved operational characteristics.
Still another object of the invention is to provide an expendable sound source having an electric motor driven by a self-contained power source

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