基于模态应变能变化率的大型风力发电机叶片损伤识别与定位  

DAMAGE IDENTIFICATION AND POSITIONING OF WIND TURBINE BLADE BASED ON ELEMENT MODAL STRAIN ENERGY CHANGE RATIO

作　　者：李雅峰[1,2] 徐玉秀[1] 

机构地区：[1]天津工业大学机械工程学院,天津300387 [2]天津工业大学现代机电装备技术天津市重点实验室,天津300387

出　　处：《太阳能学报》2015年第9期2251-2256,共6页Acta Energiae Solaris Sinica

基　　金：天津市应用基础及前沿重点资助项目(09JCZDJC24300);天津市自然科学基金重点项目(10JCZDJC23400)

摘　　要：基于模态分析理论推导风力机单叶片结构的单元模态应变能变化率计算模型,使用有限元软件ANSYS建立某风场运行的1.5 MW风力发电机单叶片有限元模型,对叶片结构进行模态分析选择4个危险截面设置损伤单元,分8种不同损伤工况研究叶片的低阶模态频率以及模态应变能变化率,以模态应变能变化率作为表征叶片结构损伤的标识量,利用单元模态应变能变化率计算模型得到叶片在不同损伤位置与不同损伤程度下的损伤辨识结果。结果表明对于叶片位置和程度损伤的评估准确有效,可作为进一步研究和实现运行监测的方法。The element modal strain energy change ratio calculation model of wind generator blade was deduced on the modal analysis theory, eight different damage conditions of 1.5 MW wind blade were established by finite element software ANSYS, element modal strain energy change ratio was took as a representative method for blade model structure damage identification and positioning. Modal strain energy change concepts of the large scale wind generator blade structure damage conditions were defined and the calculation model of the blade in different damage position and simulates structure damage of the wind turbine blade was given. The results showed that strain energy change ratio evaluation method is effective for blade damage location and damaged degree determination, and it can be used for operational monitoring of large scale wind generator blade.

关 键 词：风力发电机叶片 应变能变化率 有限元分析 损伤位置 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]