Theoretical And Experimental Study On Characteristics Of High Speed Conical Floating Ring Hybrid Bearing Rotor System

The hybrid sliding bearing has the outstanding advantages of high rotation accuracy,good stability and long service life,the conical hybrid bearing can bear radial load and axial load at the same time,and has the characteristics of compact structure and convenient adjustment.Adding a floating ring between the spindle and bearing bush can further improve the speed and stability of the tapered bearing rotor system,reduce the friction power consumption.In this paper,the conical floating ring hybrid bearing rotor system is studied,and the main research contents are as follows Based on the theory of laminar lubrication,the Reynolds equation and the corresponding boundary conditions of the oil film of the conical floating ring hybrid bearing are derived,and then the calculation formulas of the static and dynamic characteristic parameters of the oil film are obtained;the dynamic equation of the conical floating ring bearing rotor system is established.The complex method is used to optimize the structural parameters of the conical floating ring hybrid bearing.The C language program is compiled to optimize the structural parameters of the conical floating ring hybrid bearing.The pressure distribution,characteristic parameters and stiffness and damping coefficient of the conical floating ring hybrid bearing are solved on the basis of solving the multiple equation iteration of deflection angle,deep cavity flow balance and floating ring balance,The unstable speed of the bearing rotor system is solved.According to the calculation results,the bearing specimens are designed and processed,and the delicate test rig is built to collect the flow variation law under multiple working conditions;the axis trajectory and ring speed ratio of the tapered floating ring bearing under different working conditions are measured by using eddy current sensor;the system stifness and damping of the bearing rotor system are obtained by using DASP analysis software.The results of theoretical analysis and experimental verification show that:(1)When the eccentricity is between 0.1 and 0.6,the end discharge,bearing capacity and friction power consumption of tapered floating ring bearing increase with the increase of journal speed;the ring speed ratio,instability speed increases with the increase of eccentricity,and the value of instability speed is higher,which indicates that the tapered floating ring bearing rotor system has good stability.(2)By comparing the characteristic parameters with the theoretical calculation results,a more consistent result is obtained;the axis trajectory,system stiffness and system damping measured by the test show that the rotor system runs smoothly,which verifies the accuracy of the theoretical model.The research results of this paper have reference value for the design and application of conical floating ring bearing rotor system in the field of high-speed precision rotating machinery.