重庆理工大学学报（自然科学版）2025，Vol.39Issue(3)：180-186,7.DOI:10.3969/j.issn.1674-8425(z).2025.02.022
疲劳试验机主轴轴承动力学分析及其疲劳寿命预测方法
Fatigue testing machine spindle bearing dynamics analysis and fatigue lifespan prediction method
摘要
Abstract
The fatigue testing machine is an essential apparatus for investigating the fatigue characteristics of various metallic materials and their components.The key performance metric requiring assurance is the machine's prolonged and stable operation,which is constrained by the fatigue life of the main shaft bearings of the rotor system.Hence,the prediction and analysis of the fatigue life of spindle bearings are indispensable and critical phases in the development of fatigue testing machines. The conventional methods for predicting bearing fatigue life based on the L-P theory,which calculates life expectancy solely through static loads and corresponding adjustment coefficients,fails to accurately account for the influence of the dynamic characteristics of bearings within fatigue testing machines.To address this issue,we propose a novel approach for predicting the fatigue life of cylindrical roller bearings in the spindles of fatigue testing machines.Our approach integrates multibody dynamics,finite element analysis,and I-H theory,thereby considering the dynamic properties of the bearings. The principal computational procedure of our approach is as follows:first,by conducting a mechanical analysis,one calculates the radial load borne by the roller bearings within the fatigue testing machine.Then,a multibody dynamic model for the running bearing,as well as a finite element model for the contact between the roller and the raceway,are built to compute the stress-strain distribution on the rollers and the raceway.Lastly,employing the I-H theory,the fatigue life of the bearing's inner ring,outer ring,and rollers are calculated individually,from which the aggregate life expectancy of the bearing is derived. A theoretical validation of the multibody dynamics model and finite element model is conducted.Next,the fatigue life of rolling bearings under various radial load conditions is simulated and analyzed,with a comparison made to the computational outcomes based on the ISO standard algorithm and the L-P theory. Our approach takes into account the distribution of loads during the actual operation of the bearing and the deformation of its components,offering a comprehensive consideration of the fatigue life of both the rollers and the raceways.Thus,the predictions are more conservative compared to those of the ISO and L-P theories,with the discrepancy diminishing as the radial load increases.This study furnishes a potent tool for forecasting and analyzing the fatigue life of main spindle bearings in fatigue testing machines.关键词
轴承疲劳寿命预测/疲劳试验机/多体动力学/有限元方法/数值模拟Key words
fatigue life prediction of bearings/fatigue test machine/multibody dynamics/finite element method/numerical simulation分类
机械制造引用本文复制引用
张自影,朱峻炜,杨岩,刘妤,梁举科,杨鄂川..疲劳试验机主轴轴承动力学分析及其疲劳寿命预测方法[J].重庆理工大学学报（自然科学版）,2025,39(3):180-186,7.基金项目
重庆市教委科学技术研究项目(KJQN202101117) （KJQN202101117）
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0010) （cstc2021jcyj-msxmX0010）
重庆市技术创新与应用发展专项重点项目(cstc2020jscx-dxwtBX0048) （cstc2020jscx-dxwtBX0048）
