Source identification of serial impacts in a plate based on pre-signal processing and time-frequency method

摘要

Identification of impact loads is an important task in a field of condition monitoring. Identification of single source in a plate is successfully possible by using the source localization techenology (SLT). In some case, identification for multiple load is required for health monitoring. In the paper, novel research into the source localization of multiple impacts is presented. It is difficult to localize the sources of multiple impacts using current source localization technology because of the overlapping of dispersive waves induced by multiple impacts and the reflection of those waves from the edge of the plate. In the paper, a novel approach is suggested for the solution of two problems. The pre-signal processing based on band pass filtering is employed for overlapping problem, and time-frequency method is used for the solution of reflection problem. Results from numerical simulation and from experimentation are presented, and these verify the capability of the proposed method.