损伤叶片动力参数变化规律的数值模拟与试验研究

风力发电机叶片的结构动力特性是叶片结构设计时考虑的重要方面,其动力特性对于整个风力机的安全运行具有重要意义.为了研究损伤引起的结构自振频率的变化规律,从有限元模拟以及试验两方面结合进行了研究.通过对比两种研究方法所得的固有频率值的变化规律,找出他们的共性,从而互相印证结果的正确性.结果表明,叶片的固有频率值受损伤位置、...

Numerical Simulation and Experimental Study on Natural Frequencies of Damaged Blades

The structural dynamic characteristics of wind turbine blades are an important content in the design of blade structures and have great significance for the safe operation of the entire wind turbine.In this paper,the change law of the natural frequencies of the blade structure caused by damage is studied by means of finite element simulation and test.The natural frequency values obtained by the two research methods are compared.It is found that the closer the damage location is to the root of the blade and the larger the damage area is,the more the natural frequency value decreases.In the rotating state,due to the effect of dynamic stiffness,the frequency value will increase regardless of whether the blade is damaged or not.The mode-weighted modal flexibility value can be used to locate the damage of the blade and quantify the damage degree.When the mode weighted modal flexibility value has a sudden change somewhere,the damage position can be recognized and the damage degree can be determined according to the magnitude of the change value.