风电叶片全尺寸疲劳试验加载方法研究  

STUDY ON LOADING SCHEME FOR FULL-SCALE FATIGUE TEST OF WIND TURBINE BLADES

作　　者：安宗文[1] 马军霞 马强[1] 张永明 An Zongwen;Ma Junxia;Ma Qiang;Zhang Yongming(School of Mechatronics Engineering,Lanzhou University of Technology,Lanzhou 130050,China)

机构地区：[1]兰州理工大学机电工程学院,兰州730050

出　　处：《太阳能学报》2021年第10期250-257,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51665029)。

摘　　要：针对风电叶片疲劳试验中存在弯矩分布误差大及试验周期长的缺点,提出并验证一种新的全尺寸疲劳试验加载方法。首先,将疲劳试验中的风电叶片简化成悬臂梁模型并进行离散化处理,计算其固有频率以及风电叶片展向各截面之间状态量的传递关系;其次,计算风电叶片疲劳加载系统中所需的激振力;然后,分析计算单点激励多点配重疲劳试验方案下风电叶片实际承受的试验弯矩,找出影响其试验弯矩分布的主要参数;最后,以配重加载位置、加载质量以及加载数量的合理布置为目标进行多参数优化设计、建模,并通过算例验证了所建模型的准确性。结果表明所确定的试验方法是合理可行的,可为风电叶片疲劳试验技术及可靠性评估提供一定指导意义。A new full-scale fatigue test loading method is proposed and validated to overcome the shortcomings of large error in bending moment distribution and long test cycle in fatigue test of wind turbine blade.Firstly,the wind turbine blade in the fatigue test is simplified into a cantilever beam model and discretized.Based on this method,the natural frequency and the state transfer relationship between the wind turbine blades are calculated.Secondly,the excitation force required in the wind turbine blade fatigue loading system is calculated.Then,the single-point excitation and multi-point counterweight fatigue are analyzed and calculated.The main parameters affecting the distribution of test bending moments are found out by the actual test bending moments of wind turbine blades in the test scheme.Finally,multiple parameter optimization modeling is carried out to optimize the loading position,loading mass and loading point number,and the accuracy of the model is verified by a calulation example.The results show that the test method is reasonable and feasible,which can provide some guidance for wind turbine blade fatigue test technology and reliability evaluation.

关 键 词：风力机 疲劳试验 叶片 弯矩 优化设计 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]