起落架用金属关节轴承有限元分析

Finite Element Analysis on Metal Spherical Plain Bearings for Landing Gear

以大飞机起落架用WMLS17R型金属关节轴承为研究对象,基于ANSYSWorkbench建立有限元模型对3种工况下关节轴承进行静力学分析,可知:在极限载荷作用下端面沟槽底部会出现应力集中,外圈等效应力值大于材料屈服强度,会产生明显塑性变形;联合载荷下轴承最大等效应力、最大接触应力比纯径向载荷工况下要大。以外圈端面沟槽的截面形状及位置为设计变量,分析了端面沟槽结构对应力集中的影响。并考虑摩擦生热的影响,对3种工况下轴承进行了热力耦合分析,结果表明:在极限载荷下关节轴承在启动阶段会产生大量摩擦热,联合载荷工况下摩擦温升大于纯径向载荷工况,倾斜位置下摩擦温升大于正常位置情况。

Taking the metal spherical plain bearings WMLS17R for landing gear of large aircraft as research objects, the finite element model is built based on ANSYS Workbench, and the static analysis is carried out for the bearings under three operating conditions. The stress concentration appears at bottom of groove on end face under limit load, and the equivalent stress value of outer rings is greater than yield strength of material, leading to obvious plastic deformation. The maximum equivalent stress and maximum contact stress of the bearings under combined load are larger than those under pure radial load. The cross-sectional shape and position of groove on end face of outer rings are used as design variables, and the influence of structure of groove on stress concentration is analyzed. Considering influence of friction heat generation, the thermal-mechanical coupling analysis is carried out for the bearings under three operating conditions. The results show that a large amount of friction heat of spherical plain bearings is generated under limit load during starting stage, the friction temperature rise under combined load is larger than that under pure radial load, and the friction temperature rise under inclined position is larger than that under normal position.