夹心弯振压电换能器解析模型的研究.doc


RESEARCH ON EFFECTIVE ELECTRO-MECHANICAL
COUPLE FATOR OF SANDWICH TYPE
PIEZOELECTRIC TRANSDUCER USING BENDING
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VIBRATION MODE
Shi Shengjun, Zhang Qiang*
(State Key Laboratory of Advanced Robot and System,University of Harbin Institute of
Technology, Harbin 150001)
Abstract: In this paper, an analytical model of sandwich type piezoelectric transducer using bending
vibration mode is presented. The piezoelectric transducer is simplified as a constant cross section
composite beam with free-free boundary condition. The Timoshenko beam theory is involved in the
analytical modelling of piezoelectric transducer, and structure parameters sensitivity of bending
resonant frequency are obtained. The analytical model is validated paring against the result of
finite element method. The first three order resonant frequencies and vibration curves of bending mode
are obtained. The analytical model provides a theoretical basis for designing and optimization of the
sandwich type piezoelectric transducer using bending vibration mode.
Keywords: Analytical modeling; Sandwich type; Bending vibration; Piezoelectric transducer;
Timoshenko beam theory
0 Introduction
In recent years, there is an increasing interest in varied piezoelectric transducers. The
piezoelectric ceramic working in d33 mode has a high electromechanical coupling efficiency, so
the pi