Characterization of mechanical vibration damping by piezoelectric materials

H. H. Law, P. L. Rossiter, G. P. Simon, L. L. Koss

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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

Original languageEnglish
Pages (from-to)489-513
Number of pages25
JournalJournal of Sound and Vibration
Issue number4
Publication statusPublished - 17 Oct 1996

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