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本文建立了针对压电复合材料的压电复合换能器耦合振动有限元模型,采用有限元方法研究了压电复合材料类型对换能器振动模态与共振频率的影响,并对换能器共振频率与压电复合材料结构几何尺寸之间的关系进行研究。结果表明:压电复合材料类型不同,换能器的振动模态振型会发生改变,并且其前两阶共振频率差值会因压电复合材料的基体材料的杨氏模量和泊松比的不同而发生变化,即共振频率差值随着基体材料杨氏模量的增大而增大,但随着泊松比的增大而减小;而且共振频率与压电复合材料的结构几何尺寸有关,即随着压电复合材料厚度的增大,换能器的纵向振动频率与弯曲振动频率都会逐渐减少,但两频率之间的间距是逐渐拉大的。
In this paper, a coupled finite element model of piezoelectric composite transducer for piezoelectric composite was established. The influence of the piezoelectric composite type on the vibration mode and the resonant frequency of the transducer was studied by means of finite element method. The relationship between the resonant frequency and the geometry of the piezoelectric composite structure is studied. The results show that: the different types of piezoelectric composite materials, the transducer vibration mode shape will change, and the difference between the first two orders of the resonance frequency will be due to the piezoelectric composite matrix material Young’s modulus and Poisson’s ratio The difference of resonance frequency increases with the increase of Young’s modulus of the matrix material, but decreases with the increase of Poisson’s ratio. Moreover, the difference between the resonance frequency and the structure geometry of the piezoelectric composite That is, as the thickness of the piezoelectric composite material increases, the longitudinal vibration frequency and bending vibration frequency of the transducer will be gradually reduced, but the spacing between the two frequencies is gradually widened.