CMG中角接触球轴承在随机振动下的安全性分析

Safety Analysis of Angular Contact Ball Bearing in CMG under Random Vibration

研究CMG中角接触球轴承在随机振动下的安全性。推导轴承在轴向力和径向力联合作用下的轴向刚度和径向刚度,建立轴承的等效线性弹簧模型,并利用ANSYS的谱分析迭代求取轴承在随机振动下的轴向力和径向力,将径向当量静载荷和轴向载荷分别与径向基本额度静载荷和极限轴向载荷比较,分析其安全性。以某种角接触球轴承为例,验证了其在给定输入功率谱密度下任意方向加载都安全。

The safety of angular contact ball bearing in CMG under random vibration is investigated. The axial stiffness and radial stiffness of the bearing under both axial force and radial force are derived firstly, then an equivalent linear spring model is established so that the axial force and radial force of the bearing under random vibration can be iteratively obtained using the spectrum analysis of ANSYS. The safety is valuated by comparing radial equivalent static load and axial load with radial base rated static load and limit axial load separately. An analysis of a type of angular contact ball bearing under given input power spectrum density is performed. The result demonstrate that the bearing is safe in any load direction.