风电叶片疲劳加载系统的运动分析及优化

Kinematical analysis and optimization on fatigue loading system for wind turbine blades

采用两轴加载(翼面向共振)方式实现兆瓦级风电叶片疲劳寿命检测,并就关键部件——翼面向加载装置和翼弦向加载装置之间的运动耦合问题进行分析.对翼弦向加载机构的设计与分析,采用协调曲线法,利用MATLAB优化工具箱实现机构多目标函数的优化,得到翼弦向加载机构优化的偏心距、杆长及位移曲线,并得到同频和异频条件下叶片的运动轨迹.为后续的动力学分析、液压系统及控制系统设计等提供必要的理论分析基础,同时,也为该技术的实际工程应用提供理论依据.

By applying dual-axial loading,i.e.flap-wise resonance,to detect the fatigue life of MW-level wind turbine blades,the kinematical coupling between flap-wise and lead-lag loading devices are analyzed.Specifically for lead-lag loading mechanism,the coordinated curve method is developed using MATLABTM optimization toolbox for multi-objective function optimization.In this way,the optimized eccentricity,bar length and displacement curve,together with motional blade tracks under same and different frequencies,are attained.Therefore,this approach sets a theoretical basis on on-going dynamic analysis,hydraulic and control system design,and industrial applications.