Method and apparatus for active control of vibrations
Patent 4626730 Issued on December 2, 1986. Estimated Expiration Date: 
September 24, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 24, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPower steering direction sensor Safeness indicator for flexible shafts used in automotive steering mechanisms Patent #: 4398173 InventorApplicationNo. 06/779528 filed on 09/24/1985US Classes:310/326, Combined with damping structure310/316.01, Input circuit for simultaneous electrical and mechanical output from piezoelectric element310/317, Input circuit for mechanical output from piezoelectric element310/800PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)ExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmInternational ClassesF16F 9/30 (20060101)F16F 15/00 (20060101) F16F 9/00 (20060101) G05D 19/00 (20060101) G05D 19/02 (20060101) G10K 11/00 (20060101) G10K 11/178 (20060101) H01L 41/09 (20060101) B06B 1/06 (20060101) AbstractA 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.Other References
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