压电双晶片的有限元分析及实验

采用有限元分析方法,分析了压电双晶片悬臂梁的位移形变特征.研究了金属弹性层、压电陶瓷片的材料属性及几何尺寸对双晶片偏转位移的影响;计算了双晶片的弹性模量、厚度以及加载电压与位移形变产生弯应力的关系;通过位移测试、弯应力测试等相关实验对有限元分析进行了验证.当加载电压为60 V(120 Vp-p)时,双晶片的偏转位移和弯应力分别为166/μm和34.7 m·N,实验结果证明本文所建的有限元模型是合理有效的.此外,测试了压电双晶片的振动特性,测得其谐振频率为310 Hz,在该频率下加载20 Vp-p电压,其端部位移输出即可达1.7 mm.有限元分析结果及实验验证为压电双晶片结构的优化设计提供了依据.

Finite element analysis and experiment on piezoelectric bimorph

The deformation of bimorph is analyzed by using the Finite Element Method(FEM).The influences of middle elastic beam and piezoelectric layer on the deflection actuator are studied.The correlations of the applied voltage,the elastic modulus of beam and the thickness of piezoelectric 1aver are analyzed quantitatively to provide a theoretical basis and design method for the bimorph actuators.The mechanical force derived from the bimorph deformation is also studied. Furthermore,experiments are carried out to validate the finite element model.The vilidation shows that the tip-deflection ment results demonstrate that the piezoelectric bimorph model used in this paper is feasible and effective.Moreover,the resonance property of the bimorph is measured by the polytec 300-F scanning vibrometer.The bimorph performs an exceeding deflection about 1.7 mm at the tip when it resonates at a frequency about 310 Hz under an alternating voltage of 20 Vp-p.These numerical and experimental results are useful to design and optimize the piezoelectric bimorph.