An Investigation of the Dynamic Behavior of a Piezoceramic Vibrator Clamped With a Resonate Amplifier Using Equivalent Circuits

Abstract

Using equivalent circuit analysis, the dynamic behavior of ultrasonic wave propagation in solid metals is investigated in this study, particularly in Langevin vibrators clamped with a resonant amplifier to enlarge the vibrating magnitude. For piezoelectric static feature, the piezoceramic impedance and equivalent circuits were obtained for the parameter model of the vibrator via the impedance analyzer. To analyze piezoceramic dynamic feature, the characteristic of motional current relative to frequency response was measured under practical operating voltage for the vibrator. Both static and dynamic features of a piezoceramic vibrator were compared to realize the difference and to build the dynamic equivalent circuit. The vibration measurement module of optical fiber was also employed to detect the maximum displacement of a vibrator with a resonant amplifier. The measured results demonstrate that the resonant frequency is moved to the lower frequency band. The new equivalent circuit model is proposed to further match the dynamic response and the stepped horn increases the vibrating amplitude by about seven times. This is the more efficient mechanical output for a vibrator.