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《Journal of Mechanical Strength》 2007-06
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YU XiaoHong ZHANG LaiBin WANG ZhaoHui DUAN LiXiang(School of Mechanical and Electronic Engineering,China University of Petroleum,Beijing 102249,China)  
According to the question of model precision in mechanical equipment reliability life analysis,a new method estimating the Weibull distribution model's parameters by combining least-sauares method and mean rank order is put forward.The usual parameter-estimation methods have disadvantages such as man-made effect,low precision and discommodious use in site,but all of them have been effectively resolved by the method that put forward.When using least-sauares method to make parameter estimation of Weibull distribution,empirical distribution function is used as the benchmark to ascertain the life model and the lifetime model's precision is directly affected by its precision.The mean rank order estimating all rank order based on fault samples and ceasing samples to calculate the mean rank order,then putting mean rank order into approximate formula of middle rank to get empirical distribution function and the parameter precision is effectively improved by this.Thirty engines were selected to progress reliability life analysis,the result showed that this method has very strong practicability and high precision.
【Fund】: 中国石油天然气集团公司创新基金;; 教育部新世纪优秀人才支持计划资助项目(NCET050110)~~
【CateGory Index】: TB114.3
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