The dynamic characteristics model of the blade,the concept of modal strain energy and its calculation model of a structural body were stated in this paper. The modal strain energy changes rate concept under structure damage state was defined and the calculation model was presented. On this basis, taking a 15 kW wind turbine blade as the study object,the finite element model of the blade was modeled in ANSYS. By calculating frequency and element modal strain energy changes rate of wind turbine blade in different locations and under different damage rate, and using modal strain energy ratio as the damage sign parameters, the healthy status of wind blade is supervised. By using of artificial neural network to seek the essential relations between the damage sign parameters and the damage/ healthy status, an online diagnosis theoretical basis of wind turbine damaged blade is established.%文章给出了风力机叶片的动力特性计算模型、结构体模态应变能的概念及其计算模型,定义了结构体损伤状态下的模态应变能变化率概念并给出其计算模型.在此基础上,以15 kW风力机叶片为研究对象,在 ANSYS中建立有限元分析模型,计算该叶片在不同损伤位置与不同损伤程度下的频率以及模态应变能变化率,并以模态应变能变化率作为表征结构损伤的标识量,对含损伤的风力机叶片结构进行损伤辨识仿真.通过神经网络建立起损伤标识量和损伤状态之间的映射模型,为实现叶片损伤的诊断提供理论依据.
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