大功率夹心式压电换能器结构参数计算分析及设计

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (4) : 130-137.

论文

王晨青，马建敏

作者信息 +

Design and structural parameters calculation analysis of a high power sandwich piezoelectric transducer

WANG Chenqing,MA Jianmin

Author information +

文章历史 +

摘要

基于一维纵振理论和机电等效原理，得到了单匹配层夹心式压电换能器辐射声压级的计算公式，通过该公式对换能器结构参数对其谐振频率和辐射声压级(sound pressure level，SPL)的影响进行了计算分析。计算结果表明：换能器径向尺寸对谐振频率的影响不大，但前盖板径向尺寸的增大会提高辐射声压级；纵向尺寸的增大会使换能器系统谐振频率降低，但增加前盖板厚度，或增大前后盖板厚度比，有利于辐射声压级的提高；增加压电晶片的片数、厚度和面积都可使换能器辐射声压级提高；换能器发射端增加匹配层能有效提高辐射声压级，匹配层的厚度和密度对声压级幅值和带宽有影响。依据计算结果，进行了给定指标要求的换能器的设计计算。

Abstract

This research focuses on the elastic wave transmission characteristics in an orthotropic plate and isotropic beam coupling system.Based on the dynamic analysis of bending wave propagation, we deduced the power flow transmission coefficient (PTC) formulation between the subsystems and the coupling loss factor (CLF) expression at the coupling boundary.The effects of internal loss factor, frequency and direction angle α on the transmission coefficient were calculated and analyzed.The correctness of the coupled model was verified by comparison with the finite element results.Finally, the coupling structure of the isotropic plate and the beam was compared.Simulation results show that when the bending wave is incident, the direction angle α has significant influence on the transmission coefficient.When the direction angle α is 90°, the transmission coefficient is the smallest.At the same time, the internal loss factor of the beam has significant influence on the transmission coefficient.As the internal loss factor increases, the transmission coefficient also increases.

导出引用

王晨青，马建敏. 大功率夹心式压电换能器结构参数计算分析及设计[J]. 振动与冲击, 2021, 40(4): 130-137

WANG Chenqing,MA Jianmin. Design and structural parameters calculation analysis of a high power sandwich piezoelectric transducer[J]. Journal of Vibration and Shock, 2021, 40(4): 130-137

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