Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1985-09-24
1986-12-02
Budd, MArk O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310800, 310316, 310317, H01L 4108
Patent
active
046267301
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: 4366768 (1983-01-01), Kulischenko et al.
patent: 4398173 (1983-04-01), Kulischenko et al.
Shuford, Richard J. et al., Piezoelectric Polymer Films for Application in Monitoring Devices, Army Materials and Mechanics Research Center, (Feb. 1977), (AMMRC TR77-2).
Greaves, Richard and George Sawyer, Piezoelectric Transducers for Vibration and Pressure Monitoring, Phys. Technol., 14:15-18 (1983).
Edelman, Seymour, Piezoelectric Polymers and Their Applications, National Bureau of Standards, Washington, D.C.
Bailey, Thomas and James E. Hubbard, Active Vibration Control of a Cantilever Beam, Submitted for presentation at Vibration Damping Workship, Long Beach, CA, Feb. 27-29, 1984.
McElheny, Robert K., Active Control of Vibrations in a Cantilever Beam Using PVF.sub.2 Film, Submitted in Jun. 1983 to the Department of Mechanical Engineering in partial fulfillment of the requirement of the Degree of Bachelor of Science, Catalog date Sep. 28, 1983.
Budd Mark O.
Massachusetts Institute of Technology
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