<正>利用测量模态参数建立结构柔度矩阵来确定结构损伤的具体位置，然后应用神经网络技术对损伤部位进行程度识别。通过对一个简支梁的仿真计算表明，柔度矩阵差值法能准确识别损伤位置，且只用差值中最具识别特征的4个值作为输入向量即能取得较好的程度识别精度要求。

A method of structural damage identification by step was introduced. Flexibility used to locate structural damage was established with a few modal parameters of structure. Then damage extent was identified with neural network technique. A simply supported beam was used for simulation. The Method of flexibility differences can identify damage location accurately. Four numbers for characteristic recognition in differential flexibility as input vec- tors were accurate enough to identify the damage extent.