IMPACT DETECTION FOR PLATE BASED ON TIME REVERSAL PROCESSING USING EXPERIMENTALLY MEASURED SENSOR SIGNALS OF SURFACE BONDED PZT PATCHES

摘要

Time reversal processing for the measured sensor signal can be applied to detect not only structural damage but also impact loading of the structure. Impact identification capability of a time reversal processing using experimentally measured sensor signals is demonstrated in this paper. After measuring the electrical sensor signals corresponding to scattered wave filed of the plate experimentally, time reversal processing is applied to the measured signals in the numerical wave back propagation simulation for localizing the impact loading point on the plate. A time-reversed wave travels back through the plate and is focused on the region around a point where hits by the impact hammer. The illustrative experimental and numerical results demonstrate impact identification capability of the proposed method.