Elastic Wave Propagation Induced toy Piezoelectric Actuators for Health Monitoring of Electromechanical Structures

摘要

With the development of new piezoceramic materials with stronger electromechanical coupling, the application of piezoelectric actuators as energy input devices in different engineering applications has received significant attention from the research and industrial communities. Typical applications include the vibration and noise/acoustic control of space and aircraft structures, smart skin system for submarines and smart sports products. Because of their advantages of quick response, low power consumption and high linearity, piezoceramic actuators have shown the potential to induce high frequency wave propagation in structures in which they are bonded to or embedded in. The induced wave propagation can be used for the online health monitoring of these structures in conjunction with properly arranged sensors. The health monitoring of a structure requires detailed understanding of the local electromechanical field around the actuators and the resulting wave propagation. This paper provides an analytical study and numerical simulation of the wave propagation in an elastic medium generated by surface-bonded and embedded piezoceramic actuators under high-frequency electric loads.