Reliability-based Fatigue Life Prediction Method for Compressor Wheel Rub of Turbocharger for Vehicle Application
The fatigue failure of compressor wheel rub is one of important failure modes of turbocharger for vehicle application.Because the operating state of turbocharger in the life cycle changes as the work condition of diesel engine changes,the compressor wheel rub of turbocharger is applied by the variable stress which can causes the fatigue failure.In this paper,the effect of centrifugal load,thermal load and aerodynamic load on the stress of compressor wheel rub is studied,and then the fatigue stress spectrum of compressor wheel rub is developed based on the endurance test profile of vehicle engine.In order to research the fatigue strength of compressor wheel rub,the fatigue specimen is designed and the relationship between the stress and fatigue life of compressor wheel rub is built.Then,utilizing the linear Miner cumulative damage rule and the first-order reliability method,the reliability model of compressor wheel rub with fatigue failure mode is derived,and the rule that the reliability of compressor wheel rub changes with life is studied.Based on the reliability model of compressor wheel rub with fatigue failure mode developed,the method for determining the reliable fatigue life of compressor rub of turbocharger is proposed.The result shows that with the method developed in this paper the fatigue life of compressor wheel rub for the given reliability can be predicted reasonably,and the reliability of compressor wheel rub can also be calculated for the given fatigue life.
Fatigue Life prediction Turbocharger Compressor wheel Reliability Reliable life
WANG Zheng WANG Zeng-quan XING Weidong WANG A-na
National Key Laboratory of Diesel Engine Turbocharging Technology,China North Engine Research Instit Center of Engine Test and Measurement,China North Engine Research Institute,Tianjin 022,China
国际会议
北京
英文
1-6
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）