Spectral Element Modelling of Wave Propagation and Impedance Based SHM Systems

摘要: In recent years many SHM approaches based on elastic waves that are generated and sensed by surface-bonded piezoelectric patches have been developed. Some of those utilize wave propagation phenomena; others use changes in the electromechanical impedance to detect structural damage. The capability most strongly depends adequate choice system parameters like excitation signals actuator/sensor types positions. For this reason there is a growing interest efficient accurate simulation tools shorten time cost necessary tedious pretests. To small damage generally high frequency be used. Because very dense finite element mesh required for an simulation. As consequence conventional becomes computationally inefficient. A new approach seems more promising domain spectral method. This contribution presents theoretical background some results numerical calculations waves. performed using method (SEM), which leads diagonal mass matrix. Besides significant saving memory crucial reduction complexity integration algorithm calculation. simulate E/M elements shown. An example demonstrates good correlation measurement data, so proposed methodology tool make systems efficient, especially regarding parameter studies.