CHARACTERIZATION OF MECHANICAL VIBRATION DAMPING BY PIEZOELECTRIC MATERIALS

✍ Scribed by H.H. Law; P.L. Rossiter; G.P. Simon; L.L. Koss

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 321 KB
• Volume: 197
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1996.0544

✦ Synopsis

Piezoelectric materials (piezo-materials) convert mechanical energy into electrical energy via the mechanism of piezoelectricity, and this electrical energy may be dissipated through a connected load resistance. The energy dissipation through this mechanism is termed piezo-damping. New models based on this energy conversion and dissipation have been proposed to characterize the damping behaviour of the piezo-materials. An equivalent electrical circuit model is put forward to determine the required load resistance, and a mechanical spring-dashpot model is used to describe the damping capacity of the piezo-materials. Equations were derived to predict optimal resistance load, maximum damping ratio and the shift of the resonance frequency. A two-degree-of-freedom (2-DOF) experimental set-up was developed to test the validity of the models. The experimental results agree very well with the theoretical predictions. The piezo-damping mechanism exhibits potentially a high damping capacity