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1-3型压电复合材料换能器具有重量轻、声阻抗率低等优点,复合材料换能器带宽的拓展一般采用匹配层的方法。采用厚度振动模态理论、横向模态理论和有限元方法对1-3型压电复合材料换能器进行研究,应用ANSYS软件建立换能器的有限元模型,然后进行结构优化,最终制作了一个利用厚度振动模态和一阶横向模态的13型压电复合材料宽带换能器,其工作带宽为190～390 kHz,发送电压响应起伏不超过±2dB。研究结果表明:利用厚度振动模态和一阶横向模态可以拓展1-3型压电复合材料换能器的带宽,同时也给出了一种高频换能器实现宽带发射的方法。
1-3 type piezoelectric composite transducer has the advantages of light weight and low acoustic impedance. The bandwidth of composite materials transducers generally adopts matching layer method. Based on thickness vibration mode theory, transverse modal theory and finite element method, the 1-3 piezoelectric composite transducer was studied. The finite element model of transducer was established by ANSYS software, then the structure was optimized and finally made A 13-type piezoelectric composite wideband transducer utilizing thickness vibration mode and first-order transverse mode has a working bandwidth of 190-390 kHz and a transmission voltage response fluctuation of no more than ± 2 dB. The results show that the bandwidth of 1-3 type piezoelectric composite transducers can be expanded by the thickness vibration mode and the first-order transverse mode, and a method of high-frequency transducer for broadband transmission is also given.