Sonar projector with liquid mass loading for operation at lower

Details Sonar projector with liquid mass loading for operation at lower Sonar projector with liquid mass loading for operation at lower

1990-11-13

1991-10-29

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367171, 181120, H04R 1500

Patent

active

050620894

ABSTRACT:
A sonar projector having a pair of opposed oscillating pistons driven by an electromagnetic assembly is rendered capable of operating at reduced resonant frequency by providing liquid mass loading for the pistons. The mass loading is achieved by utilizing a structure which constricts a body of liquid on one side of the piston. The constricted liquid may be sea water or liquid sealed within the body of the unit. In accordance with a further aspect of the invention, a seal assembly is provided for the moving pistons which not only provides a sealing function but which also acts to radially center the pistons and to provide an axially directed restoring force thereto during piston oscillation. The electromagnetic assembly, in accordance with still a further aspect of the invention, is formed with a permanent magnet structure arranged in a cylindrical configuration with the opposed pistons on opposite axial ends thereof to reduce magnetic leakage losses.

REFERENCES:
patent: 3538494 (1970-11-01), Erickson
patent: 4001765 (1977-01-01), Sims
patent: 4030063 (1977-06-01), Wallen
patent: 4391299 (1983-07-01), Holmes
patent: 4839871 (1989-06-01), Massey
patent: 4868799 (1989-09-01), Massa

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