| Citation: | ZHANG Z B，JING S Z，YUAN S P，et al. Robust analysis of hydrodynamic performance under variable rotation speeds[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（4）：1219-1228 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0480
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Oil film, as the intermediate medium, offers substantial benefits for enhancing the stability and dependability of mechanical transmission systems with high rotation speeds. The high-speed bearing-rotor system is inevitably affected by environmental factors in manufacturing and operation. These factors affect the shape of the oil film, leading to changes in the performance of sliding bearing, and the actual working performance deviates from the design objectives. The high-speed dynamic pressure oil film was selected as the research object to grasp the influence of geometric parameters and rotation speeds on the fluctuation of oil film performance. Robust optimization and analysis were carried out and the robust optimization result of the oil film was extracted. The oil film pressure field of the hydrodynamic sliding bearing under various operating speeds is solved using the Computational Fluid Dynamics method in accordance with the various requirements of the transmission system. The performance properties: bearing capacity and friction power consumption are solved. The Kriging approximate model is established, and robust indices are calculated within the subspaces that are selected in the vicinity of the sample points. The non-dominated sorting genetic algorithm (NSGA-II) is used to solve the Pareto optimal solution of different objective combinations. The correlation analysis is carried out with the self-organizing maps (SOM), and the correlation characteristics between design objectives, geometric parameters, and rotation speeds are extracted. The robust optimal design is determined by analyzing the impact of the eccentricity on the robust indices in the optimized space. The results show that the proposed robust optimization method can clearly show the distribution of the robust optimality region in the design space and reduce the influence of geometrical parameters and rotation speeds on the oil film performance. The proposed method can improve the feasibility of design results and effectively promote the transition from a theoretical design to an engineering real-life practice.
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