Piezoelectric vibration exciter, especially for destructive mate

Details Piezoelectric vibration exciter, especially for destructive mate Piezoelectric vibration exciter, especially for destructive mate

1984-02-22

1985-01-01

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

73808, 73860, 310323, 310334, H01L 4108

Patent

active

044917597

ABSTRACT:
A piezoelectric vibration exciter for generating mechanical vibrations for the purpose of destructive material or specimen testing has two equally sized disk stacks, each with an even number of piezoceramic disks. A vibration armature serving as a clamping device for the test specimen is arranged between the two disk stacks in a stiff clamping frame having a bail and a base plate. The assembly containing the disk stacks and the vibration armature is clamped in position in the stiff clamping frame. The piezoceramic disks are energized with an AC voltage so that one disk stack will axially contract in phase with the voltage, while the other disk stack will axially expand. As a result, the vibration armature and the test specimen arranged between the disks reciprocate at the frequency of the AC voltage input.

REFERENCES:
patent: 1930905 (1933-10-01), Nicolson
patent: 2936612 (1960-05-01), Mason
patent: 3563086 (1971-02-01), Reed, Jr.
patent: 3710150 (1973-01-01), McMaster
patent: 4233849 (1980-11-01), Defebvre

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