Shock-resistant flextensional transducer

Details Shock-resistant flextensional transducer Shock-resistant flextensional transducer

H - Electricity

04

R

349/25

H04R 1/44 (2006.01) B06B 1/06 (2006.01) G01S 7/521 (2006.01) G10K 11/26 (2006.01)

Patent

CA 2007096

An underwater sonar projection includes a one piece hollow shell of elliptical cross section having a number of transducer stacks positioned within the shell and compressively prestressed by the shell to vibrate along the major axis thereof which causes the broad surfaces between the small radius ends to vibrate in and out. To resist large external shocks the shell is made somewhat heavier than usual, a center support member or beam is placed along the minor axis of the shell and an adjustable support rod is carried in the beam which is adjusted to a length just sufficient to clear the vibrating surfaces of the projector in normal operation but which functions to limit the inward movement of the shell if exposed to an explosion. The transducer stacks include a number of columns of piezoelectric disks on each side of the support beam which are bonded together, each stack having a tail member fastened to said center support beam and a head member between the disks and the end of the shell. To minimize damage to the disks, the stacks are wrapped with glass fiber cloth. Two or more such projector units may be fastened together and the ends closed by endplates.

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