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 ▼

A method of damping vibrations in a member, comprising the steps of: a. applying a distributed parameter film means of piezoelectric material for sensing and damping vibration in said member in cooperative relationship with the surface of said member and; b. sensing, with said film means, vibrations

A method of damping vibrations in a member, comprising the steps of: a. applying a distributed parameter film means of piezoelectric material for sensing and damping vibration in said member in cooperative relationship with the surface of said member and; b. sensing, with said film means, vibrations in said member and producing with said film means a first electrical signal proportional to said sensed vibration; c. applying to said film means a second electrical signal derived from said first signal of proper amplitude frequency and phase to dampen said vibrations in said member.