Model Based Damage Detection Method by using Time-reversal processing

摘要

In this paper, a model based damage detection method by using a time reversal processing for the structural health monitoring is proposed. One of the surfaced bonded PZT patches in unimorph configuration generates an incident pulse to propagate along the structure should be inspected. The guided wave in the structure is scattered by the defect and reflected by the boundary, then the other PZT patches can generate the electrical signals from the scattered wave. Applying the time reversal processing, the time-reversed electrical signals are applied as excitations to the same PZT patches where the electrical signals are measured. The wave generated by the PZT patches is refocused on the target defect again. The time-reversed wave travels back through the structure and is refocused on the point corresponding to the target defect. The location of the target defect can be identified by the numerical simulation. An illustrative numerical example to demonstrate the feasibility of the proposed method is performed for a rectangular plate structure with nine surface bonded unimorph PZT patches.