温度对小型风力机叶片固有频率的影响  

Influence of Temperature on Natural Frequency of Small Wind Turbine Blade

作　　者：李飞宇 崔红梅[1] 苏宏杰 LI Fei-yu;CUI Hong-mei;SU Hong-jie(College of Electromechanical Engineering,Inner Mongolia Agricultural University,Hohhot,China,Post Code:010018)

机构地区：[1]内蒙古农业大学机电工程学院,内蒙古呼和浩特010018

出　　处：《热能动力工程》2020年第10期140-145,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(11262015);内蒙古农业大学优秀青年科学基金(2014XYQ-9)。

摘　　要：以2 kW小型风力机叶片为研究对象,采用数值分析和模态试验相结合的方法,从叶片材料弹性模量和结构状态变化的角度,分析温度对叶片固有频率的影响,并得出叶片前4阶固有频率和环境温度之间的拟合方程。结果表明:环境温度变化使得材料弹性模量改变,其对叶片固有频率的影响远大于结构状态改变产生的影响;叶片基频试验结果和仿真结果基本相等,误差在2%以内;温度为-20~30℃时,随着温度的升高,叶片前4阶固有频率逐渐降低,两者变化呈线性关系,与20℃时固有频率相比,前4阶阶频率变化率在4.18%~5.23%之间。In this paper,a 2 kW small wind turbine blade is used as the research object,and the influence of temperature on blade natural frequency is analyzed by combining finite element numerical analysis and modal experiment.With the change of blade material elastic modulus and structural state,the fitting equation between the first four natural frequencies of blade and ambient temperature is obtained.The results show that the influence of the change of material elastic modulus on the natural frequency of the blade is much greater than that of the structural state change.The results of the blade fundamental frequency from the experimental tests and simulations are basically the same;the error is within 2%.The results show that the first four order natural frequencies of the blade decrease with the increase of temperature in the range of-20℃~30℃.The change rate of the first four order natural frequencies is 4.18%~5.23%compared with that at 20℃.

关 键 词：风力机叶片 温度 固有频率 试验模态 仿真模态 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]