ABSTRACT This article describes the vibration characteristics of the trimorph ring transducer that consists of an isotropic elastic ring laminated between two identical piezoelectric rings under mechanical traction-free and constant electric voltage boundary conditions. The electro-elasticity theory with Kirchhoff-Love plate theory was applied to formulate the electromechanical solution. The resonance, antiresonance frequencies with corresponding mode shapes were verified by the measured impedance frequency responses. And, the design of maximized electromechanical coupling coefficients (EMCC) is proceeded.
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