초록 ▼

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 vibra

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.

대표청구항 ▼

An apparatus for damping vibrations in a member, comprising: a. transducer means for sensing mechanical vibrations in said member and producing a first electrical signal proportional thereto; b. a piezoelectric film material constituting a distributed parameter controller mechanically cooperating wi

An apparatus for damping vibrations in a member, comprising: a. transducer means for sensing mechanical vibrations in said member and producing a first electrical signal proportional thereto; b. a piezoelectric film material constituting a distributed parameter controller mechanically cooperating with the member; c. means responsive to said first electrical signal for applying a second electrical signal to the film material of the proper phase and amplitude to induce a mechanical strain in the film material to dampen vibrations in said member.