The thermo-mechanical coupling dynamic analysis of gear-rotor-bearing system with multiple dynamic clearances

To accurately describe the dynamic behavior of a gear-rotor-bearing system, it is essential to consider the interplay between thermal effects and dynamics. Therefore, this study aims to develop a real-time coupling model that integrates thermal and dynamic aspects of the gear-rotor-bearing system. The objective of this model is to capture the combined effects of various nonlinear factors, including dynamic clearances caused by thermal deformation, thermoelastic coupling stiffness, non-uniform load distribution in bearings, and the multi-meshing state of the gear. To achieve this, the study introduces a stepwise coupled thermodynamic and dynamic associated solution method, which is used to evaluate the effects of thermal influences on dynamic characteristics, including vibration amplitude, dynamic behavior, thermal sensitivity, and meshing quality. The results demonstrate the significant impact of thermal effects on the dynamic behavior of the mechanical system, highlighting that these effects cannot be ignored. This research enhances the accuracy and comprehensiveness of dynamic modeling and multi-physical field coupling analysis methods for gear-rotor-bearing system, providing theoretical foundations that support designers in thoroughly assessing engineering variables and identifying opportunities to improve gear performance.