Simulation Analysis On Working Characteristics Of High-Speed Rolling Bearings Under High Pulsating Load

Rolling bearings are widely used as an important part in all kinds of machinery. With the development of modern industry, rolling bearings must work under the extreme conditions, such as heavy load, high speed and high temperature, which require them should have higher performance, longer life and higher reliability. If the real effects of rolling bearings used in actual engineering need to be determined, their working performance must be known. In the practical research, simulation is an effective method for acquiring working performance of the rolling bearings.Two quasi-static analysis mathematic models are established. One is an analysis model of high-speed angular-contact ball bearings under both axial load and radial load. The other one is an analysis model of high-speed cylindrical roller bearings under radial load. When the two kinds of rolling bearings are in running, the inner race is stationary and the outer race on which the radial load acts is rotational. The two analysis models include centrifugal force and gyroscopic movement of the rollers, variety reciprocity among all of the components as well as the effect of the elastohydrodynamic lubrication and radial clearance.The nonlinear equations of the quasi-static analysis models are solved by the method of Newton-Raphson. Its initial values are the results that acquired from analyzing the static load distributions and deformations of the rolling bearings. In order to ensure that the nonlinear equations of angular-contact ball bearings could converge rapidly and be solved correctly, restrictions for unknowns are presented. During the course of solving the model of cylindrical roller bearings, the two sets of equations which about dynamic load distributions and angular velocity of rolling elements are solved respectively and the results are used as known data mutually. Using this method, veracity and precision of the results are ensured.Working characteristics of the two kinds of high-speed rolling bearings are analyzed, mainly including contact angle and deformation of the angular-contact bearings, maximal contact stress, power consumption, additional load of high- speed rolling elements, micro-slippage on the Hertzian contact area of the angular-contact bearings, skidding in cylindrical roller bearings, lubrication characteristic as well as fatigue life when rolling bearings are subjected to variable load and speed.An analytical simulation computer program of rolling bearings'working characteristics is given. It was worked out by using Matlab and Visual Basic. Furthermore, it was tested by simulating the working characteristics of six models rolling bearings. The data obtained from the analytical software will be the numerical basis for the optimization of rolling bearings in configuration and performance.