蒙特卡洛法在共轨系统可靠性分析中的应用

发布时间：2018-05-13 00:37

本文选题：共轨系统 + 蒙特卡洛法　；参考：《江苏大学学报(自然科学版)》2016年02期

【摘要】：为了在共轨系统自主研发过程中实现结构可靠性的量化分析,采用蒙特卡洛法对建立的1种"泄漏-限流"失效模型进行计算研究.此失效模型涉及共轨系统的限流器、循环喷油量、动态回油量以及控制活塞偶件和油嘴针阀偶件的余隙泄漏.模型中的变量参数取自试验检测统计值.将蒙特卡洛法的直接抽样法、重要抽样法的计算精度和应用可行性等进行了对比分析.结果表明:采用重要抽样法得到"泄漏-限流"失效率的计算结果为7.97×10-5;限流器临界值、油嘴针阀偶件工作间隙和控制活塞偶件工作间隙对此失效率的影响较大;油嘴针阀偶件工作间隙的标准差对此失效率的敏感性较大,约为控制活塞偶件对应量的3.1倍;蒙特卡洛重要抽样法适用于共轨系统的结构可靠性计算分析,此应用简便且有效.
[Abstract]:In order to realize the quantitative analysis of structural reliability in the process of independent research and development of common rail system, the Monte Carlo method is used to calculate and study a kind of "leakage-current limiting" failure model. The failure model involves the current limiter, circulating fuel injection, dynamic oil return and clearance leakage control of piston coupling and nozzle needle valve coupling in common rail system. The variable parameters in the model are obtained from the test statistics. The accuracy and feasibility of direct sampling and important sampling of Monte Carlo method are compared and analyzed. The results show that the calculated failure rate of "leakage and current limiting" is 7.97 脳 10 ~ (-5) by using the important sampling method, and the critical value of the current limiter, the working clearance of the needle valve coupling of the oil nozzle and the working gap of the control piston pair have a great influence on the failure rate. The standard deviation of the working clearance of the needle valve coupling is sensitive to the failure rate, which is about 3.1 times that of the control piston couple, and the Monte Carlo important sampling method is suitable for the structural reliability calculation and analysis of the common rail system, which is simple and effective.
【作者单位】：江苏大学流体机械工程技术研究中心;中国一汽无锡油泵油嘴研究所;
【基金】：国家自然科学基金重点资助项目(51239005) 国家科技重大专项(2011ZX04001-061)
【分类号】：TK403

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