원판형 압전 변환기의 면내 방사 진동 특성 측정

초록

The paper experimentally deals with the radial in-plane vibration characteristics of disk-shaped piezoelectrictransducers. The radial in-plane motion, which is induced due to Poisson’s ratio in the piezoelectricdisk polarized in the thickness direction, was measured by using an in-plane laser vibrometer,and the natural frequencies were measured by using an impedance analyzer. The experimental resultshave been compared with theoretical predictions obtained by simplified theoretical and finite-elementanalyses. It appears that the fundamental mode of a piezoelectric disk transducer is a radial modeand its radial displacement distribution from the center to the perimeter is not monotonic but showsmaximum slightly apart from the perimeter. The theoretically-calculated fundamental frequencies agreewell with the finite-element results for small thickness-to-diameter ratio, and they are accurate within7 % error for the ratio up to 0.4.

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