| With the rapid development of the Aero engine industry in our country,the performance of Aero engine rotor supporting system is more demanding,of which the vibration and stability of Aero engine system have become the key technical problems in the engine development.It is of great significance to reduce the vibration reasonably that the dynamic characteristics of the rotor bearing system are rationally designed and analyzed,and the stability and reliability of the aero engine system are improved.On the basis of ball bearing dynamics,the modified Craig-Bampton substructure modal synthesis method is used for coupling the mouse cage elastic supporting with both the bearing outer ring and bearing seat.The user-written subprograms include the interaction between the various components of the bearing,the elastic support body of the cage,the extrusion film damper structure and the bearing components.Also the GSTIFF(Gear Stiff)variable step integral algorithm is used to solve the dynamic differential equations for the ball bearing with the elastic supporting body of the mouse cage and the structure of the extruded oil film damper.The dynamic simulation model of the referred rolling bearings(hereinafter referred to as the SFD ball bearing)with coupling of the cage elastic support body and the extruded oil film damper is established.Firstly,the stiffness of a specific SFD ball bearing is analyzed and studied by solving the dynamic model of the SFD ball bearing.Then it is studied that the influence of the structural parameters of the cage elastic support and the extrusion oil film damper on the vibration of the SFD ball bearing and the influence of the bearing condition on the stability of the SFD ball bearing holder are studied,and compared with the ball bearings without squeeze film damper.The results show that reasonable selection of elastic supporting structure parameters can effectively reduce the vibration of the support system and improve the stability of the cage.Finally,the slip rate test of the SFD ball bearing is carried out to verify the correctness of the established SFD ball bearing dynamics model in this paper.The findings can provide the structural design,performance analysis and optimum design of integrated bearing and oil film dampe. |
