Method and apparatus using a piezoelectric film for active contr

Details Method and apparatus using a piezoelectric film for active contr Method and apparatus using a piezoelectric film for active contr

1984-08-14

1986-01-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310322, 310328, 310800, 310316, 310317, 310330, 310311, H01L 4108

Patent

active

045659400

ABSTRACT:
A method and apparatus is disclosed in which a piezoelectric film is used to control or dampen vibrations in a mechanical system. Voltage of proper amplitude and phase is fed across the piezoelectric film to induce strain in the film of appropriate phase, amplitude and frequency to dampen beam vibrations of the mechanical system. The film may be applied directly to the mechanical system or an intermediate viscoelastic layer may be provided. Various control functions are described for determining the correct voltage to be applied to the film.

REFERENCES:
patent: 3058015 (1962-10-01), Nesh
patent: 3179823 (1965-04-01), Nesh
patent: 4197478 (1980-04-01), Silvus, Jr.
patent: 4240003 (1980-12-01), Larson
patent: 4283461 (1981-08-01), Wooden
patent: 4363991 (1982-12-01), Edelman
patent: 4451710 (1984-05-01), Taylor et al.
patent: 4453141 (1984-06-01), Rosati

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