直升机高速四点接触球轴承接触疲劳可靠性评估方法

为了准确高效地分析高速四点接触球轴承的接触疲劳可靠性,将蒙特卡罗随机有限元(MC SFEM)与应力-强度干涉理论相结合提出了一种有效的可靠性分析方法.在高速、高温和弹流润滑（EHL）的复杂工况下,利用有限元法(FEM)建立了基于热 结构耦合分析的有限元模型.考虑到轴承材料属性、润滑油参数及接触疲劳强度的随机性对可靠性的影响,在借助MC SFEM和K S (Kolmogorov Smirnov)检验确定了高速四点接触球轴承疲劳接触应力分布类型的条件下,根据应力-强度干涉理论建立了高速四点接触球轴承接触疲劳可靠性评估方法.结果表明:与传统的MC SFEM方法相比,该方法的耗时仅是传统MC SFEM的0.243％,两者之间的可靠性误差仅为1.48％,进一步验证了该方法的有效性. 

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.