Under misalignment condition, the film thickness distribution of aerostatic journal bearings is changed comparing with condition without misalignment, which results in the change of performances of aerostatic journal bearings. In the paper, the effects of misalignment along two perpendicular directions (along the vertical direction θ y and along the horizontal direction θ x ) on the dynamic coefficients and stability thresholds of both critical whirl ratio and critical inertial force calculated by the motion equation of rigid rotor-aerostatic journal bearing system are studied comparatively. The results indicate that the dynamic coefficients, critical whirl ratio, and critical inertial force are more sensitive to θ x compared with θ y . Moreover, the stability threshold of whirl ratio reduces with increasing the misalignment degree, while stability threshold of inertial force increases with increasing the misalignment degree.

中文翻译：

---

两个垂直方向不对中对刚性转子-空气静力轴颈轴承系统稳定性影响的比较研究

在不对中情况下，空气静压滑动轴承的油膜厚度分布与无不对中情况相比发生了变化，从而导致了空气静压滑动轴承的性能发生变化。本文通过刚性运动方程计算出沿两个垂直方向（沿垂直方向 θ y 和沿水平方向 θ x ）的失准对临界涡流比和临界惯性力的动力系数和稳定性阈值的影响。转子-空气静力轴颈轴承系统进行了比较研究。结果表明，与θ y 相比，动力系数、临界涡流比和临界惯性力对θ x 更敏感。此外，涡流比的稳定阈值随着错位度的增加而降低，