Impact source identification in finite isotropic plates using a time-reversal method: experimental study

An impact source identification technique for finite isotropic plates using a time-reversal method with associated signal processing algorithms is investigated experimentally. A series of low velocity impact experiments on an aluminum plate is performed to verify this impact identification method using merely four piezoelectric sensors. Validation of the experimental system for impact source identification using the time-reversal method is first examined. Critical issues concerning the spacing of calibrated points, and associated problems, have been studied in detail. The appropriate spacing of the transfer function is determined and both the impact location and impact loading history are well estimated. The factors which affect the accuracy of impact location detection and force reconstruction are analyzed. The results of the impact identification experiments are repeatable and stable. The time-reversal method is suited to identifying impact events in plate-like structures. (Some figures may appear in colour only in the online journal)