Abstract
A piezoelectric composite vibrator with a bilaminated structure is designed and fabricated, in this work by applying bending vibration to increase vibration displacement and reduce resonance frequency. The finite element software ANSYS (ANSYS, Inc. USA) is used to simulate the 2-2 and 1-3 piezoelectric composite bilaminated vibrators under free boundary condition and optimize their design. Simulation results show that the vibration displacement of the 2-2 vibrator is higher than that of the 1-3 vibrator, and the resonance frequency of the former is lower than the latter. Five pieces each of the 2-2 and piezoelectric ceramic vibrators are prepared. In addition, simulation and experimental results indicate that the vibration displacement of the 2-2 vibrator increases by 2.3 times, whereas its resonance frequency decreases by nearly 100 Hz, in comparison with those of the piezoelectric ceramic bilaminated vibrator.
Highlights
In the past 30 years, due to the rapid development of science and technology, low-frequency transducers have been more and more applied in sonar system and Marine science research
Reducing the resonant frequency and increasing the vibration displacement are the key technologies in the study of low frequency transducers
Zhang et al studied the radiation impedance of a thin circular flat plate in flexural vibration with a free boundary, and the results showed that the radiation impedance was the function of the wave number κ, the radius α, and the nodal line [8]
Summary
In the past 30 years, due to the rapid development of science and technology, low-frequency transducers have been more and more applied in sonar system and Marine science research. Reducing the resonant frequency and increasing the vibration displacement are the key technologies in the study of low frequency transducers. Aronov studied the effective electromechanical coupling coefficient and resonant frequency of bilaminated and trilaminated circular plate transducers by using the energy method [2,3]. Ding et al studied the circular composite piezoelectric vibrator and calculated and analyzed the relationship among resonance frequency, the effective electromechanical coupling coefficient, and the size of the vibrator [6]. Zhang studied three laminated plate transducers under three different boundary conditions, and derived the expressions of the resonance frequency and the effective electromechanical coupling coefficient by using the Raleigh method. Piezoelectric composite materials were used to replace piezoelectric ceramics to fabricate a bilaminated vibrator, improve the vibration displacement, and reduce the resonance frequency
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