Effect of bearing wear on linear and nonlinear responses of a rigid rotor supported by journal bearings

• Main Authors: Moorthi L.R., Inayat-Hussain J.I., Zakaria A.A.
• Other Authors: 59161510100
• Format: Article
• Published: Korean Society of Mechanical Engineers 2025
• Subjects: Journal bearings; Nonlinear analysis; Vibration analysis; Bearing wear; Highly loaded; Linear; Linear response; Linearized dynamics; Non-linear response; Nonlinear; Operating regimes; Vibration response; Worn bearings; Wear of materials

Linearized dynamic bearing coefficients are commonly used to determine the vibration response of rotors supported by journal bearings. Journal bearings can, however, behave nonlinearly, particularly in the presence of bearing wear. This work was undertaken to examine the effect of bearing wear severity on the linear and nonlinear responses of a rigid rotor at low, moderately, and highly loaded operating regime. Numerical results showed that the center of the nonlinear orbit coincides with the center of the linear orbit for all three operating regimes in non-worn bearing. However, in worn bearings, the center of the nonlinear orbit shifts away from the center of the linear orbit for all three operating regimes. The nonlinear analysis also showed that super-synchronous vibration response may occur, particularly at highly loaded operating regimes and at the maximum wear depth investigated in this work. ? The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2024.