Contact fatigue reliability assessment method of high speed fourpoint contact ball bearing of helicopter

In order to efficiently and precisely analyze contact fatigue reliability of high speed fourpoint contact ball bearing, an effective reliability analysis method was proposed by combination with MCSFEM (stochastic finite element method based on Monte Carlo) and stressstrength interference theory. Under the complex working condition of high speed, high temperature and EHL (elastohydrodynamic lubrication), the finite element model based on the thermalstructure coupling analysis was established by using the FEM (finite element method). Considering the influence of the stochastic performance of material parameters, lubricant parameters and contact fatigue strength factors on the reliability, under the premise that the distribution type of contact stress of highspeed fourpoint contact ball bearing was determined by means of the MCSFEM and the KS (KolmogorovSmirnov) method, contact fatigue reliability assessment method of high speed fourpoint contact ball bearing was established based on stressstrength interference theory. Result showed that,compared with the traditional MCSFEM method, the consuming time of the proposed method only accounted for about 0243% of the traditional method, and the error between the above two methods was only 148%, validating the efficiency of the proposed method.