摘要
设计了一套风电叶片单点疲劳加载系统,基于拉格朗日方程建立了振动耦合数学模型,对振动特征规律(叶片振幅、电机电流)分别进行数值仿真。当驱动频率与叶片固有频率偏差较小时,固存的机电耦合现象会导致叶片振幅稳定,若偏差增大,叶片振幅则发生剧烈波动。加载源电流跟随叶片振动产生周期性波动,且转速越大,等负载下的电流相对越大,共振时电流达到最大。建立了一套单点疲劳加载试验系统,对振动过程中的叶片振幅和电流进行测试。试验结果验证了数学模型与仿真模型的准确性,该结论为疲劳加载解耦控制算法的制定提供了理论依据。
A MW wind turbine blade single fatigue loading system is designed.The vibration coupling mathematical model based on the Lagrange equation is established,and the numerical simulation of the vibration characteristics(blade amplitude,motor current)is obtained.When the deviation between the driving frequency and natural frequency of the blade is small,the electromechanical coupling phenomenon leads to the stability of the blade amplitude.If the deviation increases,the amplitude tends towards disorder.The current of the loading source follows the blade vibration fluctuation.At higher speeds,the current in the condition of the equivalent load is relatively large when the current reaches maximum resonance.Finally,a single-point fatigue loading test system is set up that measures the blade amplitude and motor current on the vibration process.Test results verify the accuracy of both the mathematical and simulation models.The above conclusions provide the theoretical basis for the fatigue loading control algorithm.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第4期732-736,782,共5页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51305243
51405275)
关键词
风电叶片
疲劳加载系统
数学模型
数值仿真
试验验证
wind turbine blade
fatigue loading system
mathematical model
numerical simulation
test verification
