압전 원판이 결합된 트랜스듀서의 진동 특성

This paper theoretically deals with vibration characteristics of a transducer coupled with a piezoelectric disc. Natural frequencies of in-plane and out-of-plane modes of the transducer were obtained from the equations of motion and boundary conditions by theoretical analysis. Moreover, the natural frequencies were obtained from the impedance curves calculated by the finite-element analysis also. The theoretical analysis was verified by comparing the two analysis results. The radial in-plane and axial out-of-plane vibrations appear coupled in the axisymmetric vibration modes. Out-of-plane vibration modes of the piezoelectric transducer were much affected due to the coupled disc, but in-plane vibration modes were not.