Design and experimental study of concave longitudinal vibration piezoelectric ultrasonic transducer

This This paper designs a concave longitudinal vibration sandwich type piezoelectric transducer for suspension support of squeeze film. The transducer has hyperbolic deformable horn, which can efficiently gather energy and obtain greater energy conversion efficiency. Finite element simulation is used to predict longitudinal vibration mode, output amplitude and electrical parameters of the transducer at resonance frequency, and electromechanical coupling coefficient of the transducer can be calculated. Transducer is tested based on the above simulation analysis and theoretical calculation results. Results show that the transducer meets design requirements and its electromechanical coupling coefficient is 40.1%, which verifies rationality of structural design of the transducer and provides theoretical basis for improving energy conversion efficiency of piezoelectric transducer.