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Nonlinear dynamic analysis of a rotor-porous air journal bearing system with O-rings mounted

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Abstract

Porous air journal bearings (PAJBs) with O-rings mounted are regarded as a potential choice to offer air levitation with a large load capacity and optimal start/stop characteristics, which are required in small-sized and high-efficiency turbomachinery. However, the coupling of the mechanical properties of the O-rings and lubrication induces strong nonlinear characteristics, thereby affecting the dynamic responses of the rotor. In this study, a numerical model, which is obtained by coupling the excitation frequency-influenced stiffness and damping characteristics of O-rings, Darcy’s laws, air motion equations, and rotor and bearing motion equations, is presented. The numerical model can efficiently reflect the influences of the actual mechanical property of O-rings and the coupling between aerodynamic and aerostatic effects on the performance of a rotor-PAJB system (RPS). The model is well verified by experimental results. The effects of different system parameters on the performance of the RPS are studied by analyzing bifurcation diagrams, orbit, Poincaré maps, and fast Fourier transform plots. Results show that the rotor motion is changed between periodic and quasi-periodic with the variation in rotational speed, external supply pressure, bearing clearance, and porous permeability. With O-rings mounted, the stability of the RPS can be increased to hinder the rotor motion from changing from periodic to quasi-periodic. The effectiveness in increasing the stability of the RPS for the O-rings with styrene butadiene rubber as the material is better than that with nitrile butadiene rubber but weaker than that with methyl vinyl silicone rubber. Moreover, only a limited number of O-rings have enhancing effects on the stability of the RPS.

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Acknowledgements

The authors acknowledge the financial support by National Key R&D Program of China (2019YFB1504600), National Natural Science Foundation of China (Grant No. 52005170), Natural Science Foundation of Hunan Province (2020JJ5065), the Foundation of China Academy of Space Technology (CAST), the Fundamental Research Funds for the Central Universities, China, The Presidential Foundation of China Academy of Engineering Physics (YZJJLX2018010), Hunan Transformation and Industrialization Plan of Scientific and Technological Achievements (Grant No. 2020GK2069).

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  1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China

    Kang Zhang, Kai Feng, Wenjun Li & Lijun Song

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  1. Kang Zhang
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Correspondence to Wenjun Li.

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Zhang, K., Feng, K., Li, W. et al. Nonlinear dynamic analysis of a rotor-porous air journal bearing system with O-rings mounted. Nonlinear Dyn 107, 559–586 (2022). https://doi.org/10.1007/s11071-021-07046-2

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