Dynamic load identification on launch vehicle

In this paper, the fundamental equations of load identification in time domain are established, using the modal coordinates based on acceleration measurement DOF as the modal normalized DOF. Then, using the preliminary identified load as driving force, structural dynamical response is calculated. On the base of comparing the structural dynamical response and the measuring acceleration in frequency domain, the component of frequency domain in the preliminary identified load is modified. Thus, the final result of load identification in time domain is obtained through inverse transform. And the modification of frequency domain in this method is very important. This method of single point exciting/single point measuring has been successfully applied to identify the practical dynamic loads on Launch Vehicle.