The aerostatic bearing-rotor system plays a critical role in ensuring the stable operation of high-speed, high-precision rotating machinery. Despite its importance, the system is often affected by nonlinear sub-synchronous vibration instabilities, which limit its performance and development. To address this issue, this study proposes a novel tangentially supplied (TS) bearing. Modified gas lubrication Reynolds equations are derived, and a fluid–structure interaction model for the gas bearing-rotor system is established. By predicting gas film thickness distribution, the bearing lubrication equations and rotor motion equations are solved simultaneously. The nonlinear dynamics of the system are analyzed using bifurcation diagrams, rotor center orbits, and frequency spectrum plots, with comparisons to conventional radially supplied (RS) bearing. The results reveal differences in gas film pressure distribution, where the tangentially supplied bearing demonstrates slightly reduced load capacity but significantly suppresses sub-synchronous vibrations. Additionally, it raises both the bifurcation onset speed and the instability threshold speed, thereby improving system stability. Finally, theoretical predictions are validated through speed-up and coast-down experiments.

中文翻译：

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新型切向供应的空气静力轴承-转子系统的非线性动力学分析：理论与实验


空气静压轴承-转子系统在保证高速、高精度旋转机械的稳定运行方面起着至关重要的作用。尽管它很重要，但该系统经常受到非线性次同步振动不稳定性的影响，这限制了其性能和发展。为了解决这个问题，本研究提出了一种新型的切向供应 （TS） 轴承。推导了改进的气体润滑雷诺方程，并建立了气体轴承-转子系统的流固耦合模型。通过预测气膜厚度分布，同时求解轴承润滑方程和转子运动方程。使用分岔图、转子中心轨道和频谱图分析系统的非线性动力学，并与传统径向供应 （RS） 轴承进行比较。结果揭示了气膜压力分布的差异，其中切向供应的轴承表现出负载能力略有降低，但显着抑制了次同步振动。此外，它还提高了分岔的起始速度和不稳定阈值速度，从而提高了系统稳定性。最后，通过加速和滑行实验验证了理论预测。