损伤风机叶片模态频率变化规律的试验研究  

Experimental Study on the Variation Law of Modal Frequenciesof Damaged Blades ofWind Turbines

作　　者：顾永强 冯锦飞 贾宝华 薛刚 GU Yongqiang;FENG Jinfei;JIA Baohua;XUE Gang(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《噪声与振动控制》2020年第3期84-87,共4页Noise and Vibration Control

基　　金：内蒙古自治区自然科学联合基金资助项目(2018LH05008)。

摘　　要：风力发电机叶片是一种由复合材料构成的细长结构,由于工作环境恶劣以及运行时容易发生振动和变形,叶片极易损坏,严重影响风力发电机的平稳运行,存在极大的安全隐患。基于自振频率的变化,对叶片进行了静止状态与旋转状态下的损伤实验。试验结果表明:叶片损伤位置越靠近根部、损伤面积越大,其固有频率值降得越多。旋转状态下由于动力刚化的作用,不论叶片是否发生损伤,其频率值都会增大,在6 rad/s的转速下,其频率值最大能增加6.76%。在损伤很小的情况下,动力刚化对频率的影响大于损伤带来的影响,此种情况会为损伤识别带来困难。所得结果可为后续的研究不论是数值模拟或是试验研究提供理论依据。The wind turbine blade is a slender structure made of composite materials.Due to the harsh working environment and the vibration and deformation during operation,the blade can be damaged very easily,which seriously affects the smooth operation of the wind turbine,and has a great potential danger.In this paper,based on the variation of the natural frequency,the damage tests of the blades in the static state and the rotating state are done.The test results show that the natural frequency of the blade decreases greatly when the damage position is close to the root of the blade and the damage area is large.In the rotating state,due to the effect of dynamic stiffening,the frequency value will increase regardless of whether the blade is damaged or not.At 6 rad/s speed,the frequency value can reach 6.76%.In the case of small damage,the impact of dynamic stiffening on the frequency is greater than the impact of damage.This situation will cause the difficulty in damage identification.The results obtained in this paper may provide a theoretical basis for subsequent studies in numerical simulation and experimental study.

关 键 词：振动与波 风力机叶片 损伤识别 模态参数 

分 类 号：TU317[建筑科学—结构工程]