以简支钢梁动态分析模型为研究对象,利用ANSYS软件对梁不同位置的裂缝损伤所引起的动态响应进行数字仿真,并对所获得的响应信号利用小波包进行信号分解,对分解后的各层小波系数取平方和,提取出各分解层的能量特征,又以能量特征作为神经网络的训练数据,结合BP神经网络模型的训练仿真方法,从而实现模型梁裂缝位置的检测.并与结构模型相似研究定律相结合,根据动力相似与静力相似规律开展仿真研究,仿真结果较为满意. Taking the dynamic analysis model of simply supported steel beam as the research object, the dynamic response caused by the crack damage at different positions of beam was simulated by ANSYS software. The response signal was decomposed by wavelet packet, Taking the square coefficients of layer wavelet coefficients, the energy features of each decomposition layer are extracted, and the energy characteristics are taken as the training data of neural network, combined with the training simulation method of BP neural network model to detect the crack position of the model beam. Based on the similar research laws, the simulation research based on the similar laws of dynamic similarity and static force is carried out. The simulation results are satisfactory.