Electromagnetic transducers for underwater low-frequency high-po

Details Electromagnetic transducers for underwater low-frequency high-po Electromagnetic transducers for underwater low-frequency high-po

1986-12-11

1988-04-05

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367142, H04R 1300

Patent

active

047363509

ABSTRACT:
The power handling capacity of a high-power low-frequency underwater transducer including an inertial mass-loaded vibratile piston assembly is greatly increased by increasing the heat conduction from the inertial mass member by designing the vibrating structure to place a surface area portion of the inertial mass member in direct thermal contact with the water environment in which the transducer is submerged. In order to reduce the sound radiation from the exposed surface of the submerged inertial mass member and to obtain a broadband response with a Q equal to 1 or less, a novel rigid hollowed piston construction is described which greatly reduces the weight-to-stiffness ratio of the vibratile plate and achieves the desired low Q as well as a reduction of sound radiation from the exposed inertial mass surface by at least 20 dB below the radiation from the surface of the vibratile plate member. An alternate piston construction is also described employing multiple layers of graphite fibres bonded together into a rigid lightweight piston having a very high stiffness-to-mass ratio to achieve the objects of the invention.

REFERENCES:
patent: 2419608 (1947-04-01), Turner, Jr.
patent: 3225326 (1965-12-01), Massa
patent: 3319220 (1967-05-01), Massa, Jr.
patent: 4660186 (1987-04-01), Massa

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