【摘要】 建立了风电机组齿轮箱高速轴端轴承的热阻网络模型,研究了在变风速、变载荷情况下轴承的动态热特性.采用Ansys Workbench有限元方法进行三维热-应力耦合分析,并模拟轴承及其在故障条件下的温度、形变及热应力特征.结果表明:风速、轴承内圈和滚动体之间的接触热阻及润滑油的对流接触热阻对轴承的温度有显著影响;轴承正常运行时,最大形变出现在内圈与滚动体接触面,最大热应力出现在外圈外表面边缘;当轴承出现胶合以及磨损故障时,其温度分布、热流量及热应力均有不同程度变化.更多还原

【Abstract】 A thermal resistance network model was established for the high-speed end bearing of a wind turbine gearbox,based on which dynamic thermal characteristics of the bearing were studied at varying wind speeds and loads.Ansys Workbench finite element method was used for three dimensional thermalstress coupling analysis to simulate the temperature,deformation and thermal-stress characteristics of the bearing under fault conditions.Results show that the wind speed,the contact thermal resistance between inner ring and roller element of bearing as well as the convective thermal resistance of oil would significantly influence the bearing temperature.In the case of normal bearing operation,the maximum deformation occurs at the contact surface between inner ring and roller element,while the maximum stress occurs at the edge of outer surface of outer ring.When bonded and wear failures appear to the bearing,its temperature distribution,heat flux and thermal stress would change in different degrees.更多还原