Kinetic model and behavior interference analysis for the gear-rotor-bearing coupled system with semi-flexible body element

To investigate potential mechanisms of behavior interference between the gearbox components, based on the modeling method of flexible rotors, an analytical model for the gear-rotor-bearing coupled system with semi-flexible body elements is developed. Through simulation investigation and experimental observation, the interference mechanisms between system components are unveiled, and the response characteristic is discussed. Then, to underscore that alterations in the motion state of a single component can initiate a cascade of reactions in the behavior response of system components, the tooth root crack faults, race faults, and misaligned rotors are introduced. In addition to the general focus on the dynamic response of the coupled system, more attention is devoted to the system coupling mechanism. Pioneering discoveries of hitherto unreported phenomena are implemented. The deformation of the flexible rotor is induced by the mesh force, leading to the gear pair and bearings consistently operating under misaligned conditions. The contact angle of ball bearings and the eccentric load distribution on tooth surface are generated. Local failures scarcely alter the vibration mode of the rotor, which intensifies the behavior interference between system components.