作动器连接耳环—关节轴承系统Link单元等效建模及结构分析

EQUIVALENT MODELING AND STRUCTURAL ANALYSIS OF TRUNNION-KNUCKLE BEARINGS OF ACTUATOR

作动器连接耳环—关节轴承系统的结构与载荷的复杂性决定了其力学计算的复杂性。因为在完全润滑的条件下,关节轴承内外环之间的切向作用可以忽略,而其间的法向作用可用只能承受压力的Link单元来代替,同时这种方法避免了由于双曲率曲面接触、单元形状畸变及其他力学难题等带来的收敛困难。采取这种等效建模的方法对连接耳环的受力情况做了详尽的分析,计算了与之相连的关节轴承的载荷及变形状况,为结构设计的改进提供指导。

Due to the structural and loading complexities, difficulties arise in the analysis of trunnion-knuckle bearing system of actuator. An equivalent model is developed to investigate the structural characteristics of the trunnion-knuckle bearing system of actuator. The interaction between inner ring and outer ring of knuckle bearings is identified as the key factor in the system analysis. With well lubrication, the tangential action of the inner-outer ring can be omitted and there is only compression action in normal direction. In this paper, a new link element model is presented to simulate inner-outer ring interaction under pure compressive condition. This model can avoid contact analysis of hyperbolic surfaces and element distortion, therefore the calculation convergence is assumed. With this model, the strength of trunnion-knuckle bearing system is analyzed, which is helpful to structural design.