论文部分内容阅读
随着超声马达、超声塑料焊接、超声疲劳试验以及超声旋转加工等新技术的发展,扭转振动超声换能器的理论及实验研究受到了普遍重视。在功率超声领域,类似于纵向振动夹心式换能器的扭转振动夹心换能器具有结构简单、机电转换效率高等优点。在纵向振动夹心式换能器中,压电激励元件为轴向极化的压电陶瓷晶堆,而对于扭转振动夹心式换能器,其激励元件为切向极化的压电陶瓷晶堆。文献[1]对夹心式扭转振动超声换能器进行了研究,推出了压电晶堆扭转振动的等效电路以及换能器的共振频率方程。在此基础上,本文对晶堆中的扭转振动传播速度进行了进一步的研究,试图为夹心式扭转振动超声换能器的理论及实验研究提供较系统的设计理论。
With the development of new technologies such as ultrasonic motor, ultrasonic plastic welding, ultrasonic fatigue test and ultrasonic rotary processing, theoretical and experimental studies on torsional vibration ultrasonic transducers have received universal attention. In the field of power ultrasound, the torsional vibrational sandwich transducer similar to the longitudinal vibrational sandwich transducer has the advantages of simple structure and high electromechanical conversion efficiency. In longitudinal vibrating sandwich transducers, the piezoelectric actuator is an axially polarized piezoelectric ceramic stack, whereas for torsional vibration sandwich transducers, the excitation element is a tangentially polarized piezoceramic stack . Literature [1] studied the sandwich-type torsional vibration ultrasonic transducer and introduced the equivalent circuit of the torsional vibration of the piezoelectric crystal pile and the resonance frequency equation of the transducer. On this basis, the paper further studies the torsional vibration propagation velocity in the reactor and attempts to provide a more systematic design theory for the theoretical and experimental research of the sandwich torsional vibration ultrasonic transducer.