具有随机退化特性的柱塞泵性能可靠性分析.pdf

第 46 卷第 14 期 机 械 工 程 学 报 Vol.46 No.14 2 0 1 0 年 7 月 JOURNAL OF MECHANICAL ENGINEERING Jul. 2 0 1 0 DOI ：10.3901/JME.2010.14.189 具有随机退化特性的柱塞泵性能可靠性分析* 马纪明 詹晓燕 (北京航空航天大学可靠性与系统工程学院 北京 100191) 摘要：对于存在性能退化的系统，以性能指标作为评价可靠度的判据具有实际的工程意义。基于系统组元退化的机理及性能 退化的过程，阐述柱塞泵的性能可靠性分析方法，该方法综合路径追迹法注重性能退化机理和图解分析法注重退化过程的优 点。根据柱塞泵的流量响应面，对影响柱塞泵流量的组元参数及其退化路径进行分析。受内因(设计参数)和外因(环境、负载) 不确定性影响，柱塞泵组元的退化路径具有随机性，这也导致作为柱塞泵性能可靠性判据的流量特性的退化具有随机性。根 据柱塞泵性能可靠性判据和集理论，给出柱塞泵性能可靠性的解析方法，并基于一种高效的 Monte-Carlo 仿真方法得到柱塞 泵的性能可靠度的累计分布函数曲线。提出的柱塞泵性能可靠性分析方法以性能为判据，综合内外因素对组元退化轨迹的影 响，并考虑到了性能退化的随机性，能够克服传统基于二元逻辑的可靠性分析方法的不足，可以推广应用于其他存在性能退 化的复杂系统中。 关键词：柱塞泵 性能可靠性 退化 机理 过程 中图分类号：TB114.3 Performance Reliability Analysis of a Piston Pump Affected by Random Degradation MA Jiming ZHAN Xiaoyan (Department of System Engineering, Beihang University, Beijing 100191) Abstract ：Taking performance indexes as reliability criterion for systems with performance degradation has practical engineering significance. A performance reliability analysis method based on component regressive mechanism and performance degradation process is presented, which integrates the advantages of path tracing methods and graphical methods. The response surface of the piston pump flow rate is created, and the parameters of the variables and their regressive path are analyzed simultaneously. The degradation path of the component parameter has some randomness caused by the uncertainties of the internal and external factors, this causes the degradation of flow, which is taken as reliability criterion for piston pump performance, also to have randomness. Based on the per