Research on Dynamic Characteristics of Gear-Rotor-Bearing Transmission System in Non-inertial System

To study the dynamic characteristics of the gear-rotorbearing system under a non-inertial system.

A gear-rotor-bearing finite element dynamic model consisting of flexible shafts, rigid gear rotors, gear meshing, and bearings under non-inertial system is established and the transmission system's characteristics are investigated. First, the equations of motion of the rotor and shaft element are derived, and the gyroscopic effect in the gear rotor and shaft is considered. The subsequent step is to deduce the nodal equations of the gear mesh, which include the time-varying mesh stiffness, mesh damping, and transmission error excitation. The basic bearing stiffness and damping matrices are utilized to study the bearings’ influence as elastic support boundaries. In conclusion, a dynamic model of the gear-rotor bearing system is assembled based on the node positions. Natural properties and dynamic responses are also investigated.

The results indicate that, in a non inertial system, the carrier (jet fighter) acceleration in the X-direction can suppress the x-direction vibrations to a certain degree and amplify the vibrations in the angular direction about the z-axis. The angular motions of the carrier about the Z-axis amplifies x-direction vibrations while suppressing vibrations about the z-direction.