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对不同覆冰状态下的风力机叶片动力特性进行了模拟实验研究,定义叶片覆冰状态参数,包括覆冰区域起点参数、覆冰区域长度参数和覆冰厚度参数。利用人工环境实验室和模态分析系统建立风力机叶片覆冰振动测试实验台,对风力机模拟叶片在不同覆冰状态下进行模态分析,从叶片的曲率模态参数中提取判断风力机叶片覆冰参数的特征值指标,从实验结果获得的特征值较准确地诊断出风力机模拟叶片覆冰状态。通过仿真计算得到叶片结构的质量变化率和抗弯刚度变化率重合点。上述仿真及实验结果表明风力机叶片覆冰诊断理论方法以及技术具备正确性与可行性。
The dynamic characteristics of wind turbine blades under different icing conditions were simulated and studied. The parameters of blade icing condition were defined, including the starting parameters of icing region, the parameters of icing region length and icing thickness parameters. The artificial environment laboratory and the modal analysis system were used to establish the wind turbine blade icing vibration test bench. The simulation analysis was carried out on the wind turbine simulation blades under different icing conditions. The wind turbine blades were extracted from the curvature model parameters Icing parameters of the eigenvalue indicators, the experimental results obtained from the eigenvalue more accurately diagnosed wind turbine simulation of icing condition. Through the simulation calculation, the rate of change of mass ratio of leaf structure and the rate of change of bending stiffness are obtained. The above simulation and experimental results show that wind turbine blade icing diagnosis theory and technology with correctness and feasibility.