Research on Optimized Design for Piezoelectric Ultrasonic Transducer Based on Six-terminal Network
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摘要: 压电超声换能器传统四端网络设计方法将压电陶瓷晶堆等效为电学四端网络，忽略了压电陶瓷晶堆内部的机电耦合过程，增加了压电超声换能器的设计误差。为了提高压电超声换能器输出的超声振动幅值，本文将考虑压电陶瓷晶堆内部机电耦合作用的六端网络引入到压电超声换能器的设计中，分别采用四端网络法和六端网络法设计得到两个不同尺寸的压电超声换能器A和B，通过有限元方法对比分析了两个换能器的固有频率和输出振幅，并进一步通过实验验证了设计理论与仿真分析的有效性。研究结果表明，在相同激励电压下，采用六端网络法设计得到的压电超声换能器B输出的超声振幅是换能器A输出振幅的1.5倍，六端网络法设计压电超声换能器可以提高所设计换能器的振动性能。Abstract: The conventional four-terminal network design method of piezoelectric ultrasonic transducer (PUT) equates the stacked piezoelectric ceramics (SPCs) to a electrical four-terminal network, ignoring the electromechanical coupling process inside the SPCs and increasing the design errors of the transducer. Aimed to obtain a larger ultrasonic amplitude, this article designed two PUTs of different sizes by the four-terminal network and the six-terminal network, named transducer A and tansducer B, respectively. The natural frequency and output amplitudes of the two PUTs were compared and analyzed by finite element method(FEM), and the experiments further verified the validity of the theory and the simulation analysis. When the excitation woltage is same, the results show that the output amplitude of transducer B (designed by six-terminal network) is 1.5 times larger than the amplitude of transducer A, and appling six-terminal network to the PUT designing can improve the vibration performance of PUT certainly.
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