Precise Measuring Method of Electromechanical Coupling Coefficient of Piezoelectric Element

Abstract

This paper describes the precise measuring method of electromechanical coupling coefficient of piezoelectric element. The precise electromechanical coupling coefficient of a piezoelectric element is needed to know the performance of the active vibration control or the passive vibration suppression using piezoelectric elements. However, the coefficient could not be measured good enough to simulate the performance of the vibrating system by the conventional method because of the error of the measurement. In this study, a new method using the resonance frequencies when an inductance is connected to the piezoelectric element was proposed, and the effectiveness was investiated by experiments.