Study on Vibration Characteristics of Trilayer Composited Bending Vibration Transducer under the Simply Supported Boundary Condition

Theoretical study of three laminated disc bending vibration transducer is carried out under the simply supported boundary condition by using the Rayleigh method,and the resonant frequency and the effective electromechanical coupling coefficient are derived. Variation of the resonant frequency and the effective electromechanical coupling coefficient with the transducer size parameters are analyzed. The results show that the structural parameters of transducer has great influence on the resonant frequency and the effective electromechanical coupling coefficient,that is,the resonant frequency increases with the increase of the dimension parameter,and when the other dimensions are certain,the effective electromechanical coupling coefficient increases with the increase of the sheet metal thickness,there is a maximum value. It provides a theoretical support for wide application of the three laminated bending vibration transduce.