Method and apparatus using a piezoelectric film for active control of vibrations
Patent 4565940 Issued on January 21, 1986. Estimated Expiration Date: 
August 14, 2004. 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.
August 14, 2004. 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 References 3058015 3179823 Electronically tunable resonant accelerometer Apparatus and method for suppressing mass/spring mode in acoustic imaging transducers Piezoelectric polymer antifouling coating Drag modification piezoelectric panels Precisely stabilized piezoelectric receiver Suppression of vibration effects on piezoelectric crystal resonators Patent #: 4453141 InventorApplicationNo. 06/640759 filed on 08/14/1984US Classes:310/326, Combined with damping structure310/311, Piezoelectric elements and devices310/316.01, Input circuit for simultaneous electrical and mechanical output from piezoelectric element310/317, Input circuit for mechanical output from piezoelectric element310/322, Acoustic wave type generator or receiver310/328, With mechanical energy coupling means310/330, Bending type310/800PIEZOELECTRIC 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 11/178 (20060101) G10K 11/00 (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.Field of SearchCombined with damping structureWith mechanical energy coupling means Acoustic wave type generator or receiver Supported by elastic material Piezoelectric elements and devices PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF) Input circuit for mechanical output from piezoelectric element Electrical output circuit Bending type Plural elements Multimorph Including inertia type operator | |
