基于应变模态参数的结构瞬态载荷识别方法研究

The identification of transient loads was focused and a load identification model was proposed based on strain response and strain modal parameters. Assuming that the load is constant in a time step, the load recognition model based on displacement response was derived via the Duhamel integral and the corresponding regularization method was presented. The conversion relation between strain responses and displacement responses was introduced by using the displacement mode and the strain mode, which results in a strain-based load identification method. The proposed method avoids the spatial integral process from strain to displacement and the stability of the conversion process is ensured by introducing the regularization method. The simulation of a marine satellite was used to demonstrate the method. The distortion of recognition under single point excitation was analysed. The practical effect of the method was demonstrated by a free beam hammering experiment. The results prove that the recognition model has a good identification effect on the transient load, and the conversion precision and robustness of the strain-displacement conversion relation are ideal.