风电叶片多点加载系统的机电耦合特性及试验研究

Experiment and Electromechanical Coupling Characteristics of Multi point Excitation Fatigue Loading System

摘要:

针对风电叶片加载多点激振时出现耦合问题，对多点疲劳加载系统进行合理简化，以两点摆锤激振加载为对象建立动力学数学模型，构建系统的机电耦合方程.在共振条件下的对机电耦合关系进行求解，通过相平面法得到振动系统的机电耦合特性、平衡奇点处的谐振同步性及稳定性条件，揭示加载系统出现耦合现象的机理.试验研究系统动态分岔耦合、主共振机电耦合特性及机电耦合作用下的同步控制，验证理论分析的正确性及控制算法的有效性，为疲劳加载系统的工程应用提供指导及试验参考.

关键词:风电机组叶片; 非线性; 激振加载; 机电耦合

Abstract:

The multi point fatigue loading system was simplified for the coupling problem occuring in case of wind turbine blade loading multi point excitation. The dynamic mathematical model was established by using the two eccentric block vibration loading as object, constructed electro mechanical coupling equations for the system, and then the electro mechanical coupling was solved by the small parameter cycle average method in resonance conditions. Electromechanical coupling characteristics and stability conditions of vibration system were obtained by the phase plane method. The mechanism of system coupling was revealed. The mechanical and electrical coupling characteristics of primary resonance, system dynamic bifurcation coupling and synchronization control were studied. The coupling characteristics of dynamic bifurcation and its avoidance method were obtained. Finally, the correctness of theoretical analysis through the test, provide guidance for the engineering application of the fatigue loading system, and which provides a reference for similar engineering application and test.

Key words:wind turbine blade; nonlinear; excitation loading; electro mechanical coupling