低速冲击载荷下的风电叶片刚度退化规律  

STIFFNESS DEGRADATION RULE OF WIND TURBINE BLADE UNDER LOW-VELOCITY IMPACT LOAD

作　　者：白学宗[1] 安宗文[1] 侯运丰[1] 马强[1] Bai Xuezong;An Zongwen;Hou Yunfeng;Ma Qiang(School of Mechatronics Engineering,Lanzhou University of Technology,Lanzhou 730050,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》2022年第1期132-139,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51265025);甘肃省高等学校产业支撑引导项目(2020C-12)。

摘　　要：该文主要研究低速冲击载荷下叶片的刚度退化规律。首先用相邻2个时段风速的线性增量来定义风速突变量并获得低速冲击载荷,然后通过实验获得低速冲击载荷下的损伤规律,最后基于实测风速对疲劳试验结果进行修正,并对服役1年内的叶片刚度退化量进行分析并与实测记录进行对比。结果表明:考虑低速冲击损伤时,疲劳试验结果更准确且在役叶片刚度退化分析结果更接近实测值,这有助于合理评估叶片疲劳性能和准确分析在役叶片刚度退化量。The stiffness degradation law of blades under low-velocity impact load is taken as the main research objective.Firstly,the linear increment of wind speed in two adjacent periods is used to define the sudden change of wind speed,and then the low-velocity impact load is obtained.Secondly,the stiffness degradation rule of blades under low-velocity impact load is obtained by a specific experiment.Finally,the stiffness degradation curve under the fatigue test is modified based on the measured wind speed,and the stiffness degradation value of the in-service blade within one year is analyzed and compared with the measured results.It shows that the fatigue test results are more accurate and the stiffness degradation analysis results of the in-service blades are closer to its measured values when low-velocity impact damage is considered,which is helpful to evaluate the blade fatigue performance reasonably and analyze the in-service blade stiffness degradation accurately.

关 键 词：风电叶片 疲劳试验 刚度退化规律 低速冲击载荷 风速突变 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]