Bending vibration characteristics of the piezoelectric composite double laminated vibrator

Abstract In this study, the bending vibration characteristics of the piezoelectric composite double laminated vibrator are studied by simulation and experiment. Firstly, the bending vibration characteristics of a 2-2 piezoelectric composite double laminated vibrator under free and fixed boundary conditions are simulated by the finite element analysis software. Results show that the vibrator has a pure bending vibration mode in the frequency band of 2–4.6 kHz. Then, two types of a 2-2 piezoelectric composite double laminated vibrator are prepared by using epoxy resin and silicone rubber. The test results show that the resonance frequencies of the free and fixed boundaries are ~4.5 and 2.5 kHz, respectively. The vibrator has relatively pure bending vibration characteristics, especially the silicone rubber vibrator, which has lower resonance frequency, higher electromechanical coupling coefficient and larger bending vibration displacement; thus, the 2-2 piezoelectric composite double laminated vibrator is a better choice for the fabrication of a low-frequency transducer.