Communications – electrical: acoustic wave systems and devices – Miscellaneous
Patent
1990-07-19
1991-09-10
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Miscellaneous
277 81R, 137247, G01V 138
Patent
active
050479970
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 a 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: 4450543 (1984-05-01), Neeley
patent: 4679179 (1987-07-01), Lally
patent: 4949319 (1990-08-01), Boeglin et al.
Argotec Inc.
Steinberger Brian S.
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