基于多体动力学的双馈式风机复合主轴传动链建模与仿真分析

Modeling and simulation analysis of composite mainshaft drive train of doubly-fed wind turbinebased on multi-body dynamics

文章设计了风电机组的复合主轴,采用了柔性多体动力学理论对风电机组传动链进行高精度建模,建立了风电机组传动链系统拓扑结构和动力学微分方程组,构建了风电机组传动链系统的动力学数学模型,通过时域瞬态动力学分析研究各部件的力、速度、加速度等的响应,揭示了传动链的模态、阶次和共振特性。基于柔性多体动力学平台建立了风电机组传动链高精度仿真模型,对传动链的激励频率及固有频率进行模拟分析,并与通用软件计算结果及实测数据进行了对比验证。验证结果表明,柔性多体动力学仿真结果与通用软件计算结果的仿真载荷时序曲线趋势一致,且载荷均值、幅值比较一致,与动态频率的实测结果平均相差1.51%。同时设计了复合主轴,编写复合材料主轴优化程序,与传统主轴相比,重量轻、刚度更好,优化后的传动链位移、速度、加速度、载荷的极限值分别降低了1.0%,42.7%,13.8%和2.1%,表明了系统更加稳定。

The composite mainshaft of wind turbine is designed,the flexible multi-body dynamics theory is used to model the wind turbine drive train exactly,the topological structure and dynamic differential equations of the wind turbine drive train system are established,and the dynamic mathematical model of the wind turbine drive chain system is constructed.The response of force,velocity and acceleration of each component is studied through time-domain transient dynamic analysis,so as to reveal the mode order and resonance characteristics.After the results are processed,the multi-body dynamics simulation results are compared with the measured data.The average difference of dynamic frequency is 1.51%,which proves the consistency between the simulation model and the measured model.At the same time,Compile the optimization program of composite mainshaft,compared with the traditional mainshaft,the composite mainshaft has light weight and better stiffness.After optimization,the limit values of displacement,speed,acceleration and load of the driver train are reduced to different degrees,which are 1%,42.7%,13.8%and 2.1%respectively,which indicates that the system is more stable.Using multi-body dynamics model instead of physical prototype to test and evaluate various characteristics of its candidate design,which can effectively reduce R D cost and shorten R D time.