航天器中润滑球轴承疲劳寿命数值仿真

Numerical Simulation of Fatigue Life of Lubricating Ball Bearing in Spacecraft

航天器通常处于加速度变化、振动、冲击以及温度梯度等极端条件,因此,固体润滑球轴承的疲劳寿命受到多种因素影响,对其数值模拟具有复杂性和高难度性。为此,提出航天器机构固体润滑球轴承疲劳寿命数值模拟方法。确定轴承类型以及相关结构参数、详细计算轴承的应力、屈服应力以及应变率等变量值,构建轴承的有限元模型;设定不同实验条件,对轴承疲劳寿命数值仿真测试,获取轴承的疲劳损伤规律。分析结果表明,航天器机构固体润滑球轴承疲劳寿命数值与轴承载荷、应力值、转速以及摩擦系数、轴承自身尺寸等因素相关;轴承会随着载荷、应力值、转速以及摩擦力的增加而缩短自身疲劳寿命,与此同时,轴承会随着尺寸的增加而提升自身的疲劳寿命值。

Typically,spacecraft are subjected to extreme conditions such as varying acceleration,vibration,shock,and temperature gradients.As a result,the fatigue life of solid lubricated ball bearings in spacecraft mechanisms is influenced by numerous factors,making their numerical simulation complex and challenging.To address this issue,a numerical simulation method for the fatigue life of solid lubricated ball bearings in spacecraft mechanisms was presented.Firstly,the types of bearings and relevant structural parameters were determined.Meanwhile,variables such as bearing stress,yield stress,and strain rate were calculated in detail.Subsequently,a finite element model of the bearing was constructed.Furthermore,various experimental conditions were set to conduct numerical simulation tests on the fatigue life,thereby obtaining the fatigue damage law of the bearing.The analysis results demonstrate that the fatigue life of solid lubricated ball bearings in spacecraft mechanisms is related to factors such as bearing load,stress,speed,friction coefficient,and the size of the bearing itself.The fatigue life of the bearing decreases with increases in load,stress,speed,and friction,while it increases with the size of the bearing.