Semi-analytic formulation and its experimental verification to determine the radiation patterns of ultrasonic guided waves generated on a plate by a magnetostrictive patch transducer

摘要

In the non-destructive evaluation of plate structures using ultrasonic guided waves, the radiation patterns of ultrasonic transducers that generate and measure elastic guided waves must be analyzed. This work develops a semi-analytic formulation to predict these patterns and verifies this method experimentally. Magnetostriction is employed as the transduction mechanism between electrical and mechanical energies to control the direction of ultrasonic guided wave emission. This study also shows that the proposed semi-analytic method, which consists of a numerical method and an analytic formulation, effectively estimates radiation patterns even when the static and dynamic magnetic fields are arbitrarily distributed.