Study on chaotic dynamic behavior of magnetic liquid double-suspension bearings under rub-impact faults

Magnetic liquid double-suspension bearing (MLDSB) is a novel type of bearing that significantly enhances load-bearing stiffness and stability by integrating an electromagnetic suspension system with a hydrostatic support mechanism. However, due to its unique structural design, a small clearance between the rotor and stator makes it susceptible to rub impact, leading to rotor instability and chaotic phenomena. This paper aims to investigate the influence of rub-impact faults on the bifurcation behavior of MLDSB systems and validate theoretical simulations through experimental verification. First, the dynamic equations of the rotor under rub-impact faults are derived and simplified. Then, a numerical integration method is used to study the effects of different structural and operational parameters on the bifurcation behavior, resulting in bifurcation diagrams and phase plots. Simulation analysis explores the system's periodic distribution under various parameter combinations, and the stable operating ranges for the system under dual-parameter combinations are determined. Finally, the simulation results are compared with experimental data to verify the validity of the simulations. The findings provide theoretical insights for the design and application of MLDSBs and offer a new perspective for studying chaotic dynamics.