Identification of impact load using transient statistical energy analysis method

Abstract

A new identification method for impact loads is proposed based on the transient statistical energy analysis theory. The load identification problems of structure subjected to single excitation are classified into three cases according to the completeness of load location information and subsystem response set. The input energy of impact load and the load location is firstly identified from the averaged vibration energy responses of subsystems according to energy balance equation for three cases. The load amplitude spectrum is thereafter derived under the assumption of constant value of itself from the identified input energy within each analytical frequency band. Finally, the time history of impact load is further determined for the given load time domain waveform using a developed fitting method. The experimental studies of impact load identification are conducted on a plate-shell assembled structural system. The results show that the location and input energy of impact load can be identified with fairly accuracy using the presented identification method. Besides, both the load spectrum and time history of impact load have good agreements with the measured ones.