某航空电机主轴轴承的多轴振动应力响应分析

基于随机振动载荷作用的轴承疲劳寿命分析较复杂,其关键是要得到准确的应力分布。因此,对某航空电机的主轴轴承进行应力响应分析。首先,基于某航空电机主轴轴承的特点,在轴向、航行和垂向的功率谱密度下,建立了多轴随机振动作用下的Von Mises应力分布模型。其次,采用Ansys Workbench对其进行有预应力的模态分析和随机振动应力响应分析。最后通过对比理论计算与仿真获得的应力均值和应力标准差值结果,验证了功率谱密度作用下的应力响应分析方法的可行性,为疲劳寿命分析提供依据。

Analysis for Multiaxial Vibration Stress Response of the Main ShaftBearing of an Aviation Motor

The bearing life analysis under the random multiaxial loading was the very complex, the key was to get the exact stress distribution. Therefore, the stress analysis was carried out for the main shaft bearing of an aviation motor. Firstly, based on the characteristic of air motor axis bearing, the Von Mises stress distribution model of the random multiaxial loading was built up under the axial, sailing and vertical direction power spectrum density. Secondly, the modal with prestress analysis and random vibration analysis were carried out through Ansys Workbench. Finally, the mean value of the stress was compared. The correctness stress analysis method was validated, which lays the basis for the bearing fatigue life analysis.