基于变载工况的海上风电机组主轴轴承刚柔耦合动态响应分析

Dynamic Response Analysis on Rigid-Flexible Coupling of Main Shaft Bearings for Offshore Wind Turbines Under Variable Loads

针对海上风电机组主轴用三排圆柱滚子轴承在恒载工况下的仿真结果存在局限性、片面性的问题,提出了一种变载工况下的仿真分析方法,建立了轴承接触力学模型和柔性体模型并对轴承内圈、外圈、保持架进行了刚柔耦合处理。基于变载工况,分析了刚性模型与刚柔耦合模型的理论速度、仿真速度以及加速度响应,并通过刚柔耦合模型研究了三排圆柱滚子轴承内部不同接触表面的接触力特性,结果表明:刚性模型的自转误差比刚柔耦合模型大3.67~22.6倍,刚柔耦合模型的加速度趋势更加平稳且速度波动更小;近风叶轮毂端的推力滚子受力约是远端推力滚子的1.85倍,保持架的平均受力是远端保持架的1.6倍。

Aimed at limitations and biases of simulation results of three-row cylindrical roller bearings for offshore wind turbine main shafts under constant load conditions,a simulation analysis method under variable load conditions is proposed.The contact mechanics models and flexible body models of the bearings are established,and the rigid-flexible coupling is applied to inner rings,outer rings and cages of the bearings.Based on variable load conditions,the theoretical velocities,simulated velocities and acceleration responses of both rigid model and rigid-flexible coupling models are analyzed.The contact force characteristics of different contact surfaces inside the bearings are studied by rigid-flexible coupling model.The results indicate that the rotational errors in rigid model are 3.67~22.6 times larger than those in rigid-flexible coupling model,the rigid-flexible coupling model shows smoother acceleration trends and smaller velocity fluctuations;the force on thrust rollers at hub end close to wind turbine blades is about 1.85 times larger than that on the rollers at far end,and the average force on cages at hub end is 1.6 times larger than that on cages at far end.