有局部缺陷的滚动体中介轴承动力学建模及仿真研究

在考虑径向间隙及滚动体缺陷通过内、外圈时接触变形量发生变化基础上，建立两种支承形式下滚动体含单一故障缺陷的中介轴承动力学模型。对比研究不同支承形式及内、外圈不同旋转方向对中介轴承振动影响。结果表明，采用内圈支承于高压转子、外圈支承于低压转子结构振幅大于内圈支承于低压转子、外圈支承于高压转子结构；内、外圈同向旋转振幅大于反向旋转；内、外圈反向旋转冲击振幅小不利于发现故障，反向旋转时缺陷冲击滚道频繁，同等运行条件下，反向旋转中介轴承潜在危险更大；保持架旋转频率为中介轴承振动信号的主要调制频率，且内、外圈反向旋转较同向旋转调制效果更强烈。

Research of dynamics model and simulation for local defect rolling element of intershaft bearing

On the basis of considering radial clearance and the changing of contact deformation when defect rolling element passing inner and outer ring, an intershaft bearing dynamic model with local defect rolling element was established under two kinds of supporting form. The vibration effect of different supporting form and different rotating direction of inner and outer ring were comparatively researched in this paper. The result shows that，the vibration amplitude of the supporting structure with the inner ring bearing in the high-pressure rotor and the outer ring bearing in the low-pressure rotor is bigger than the supporting structure with the inner ring bearing in the low-pressure rotor and the outer ring bearing in the high-pressure rotor；compared to inner and outer ring counter-rotating, the vibration amplitude of inner and outer ring co-rotating was bigger；although the impact amplitude was small and it was not conducive to find fault when inner and outer ring counter-rotating, it is more frequently that the defect attacks the rolling element, so under the same operating condition, the co-rotating intershaft bearing has a larger potential risk；the rotating frequency of cage was the main modulation frequency of intershaft bearing vibration signal, and compared to inner and outer ring co-rotating, the modulation effect of inner and outer ring counter-rotating was more intense.