A new method of system failure analysis was proposed. First, considering the relationships between the failure subsystems,the decision making trial and evaluation laboratory(DEMATEL) method was used to calculate the d...A new method of system failure analysis was proposed. First, considering the relationships between the failure subsystems,the decision making trial and evaluation laboratory(DEMATEL) method was used to calculate the degree of correlation between the failure subsystems, analyze the combined effect of related failures, and obtain the degree of correlation by using the directed graph and matrix operations. Then, the interpretative structural modeling(ISM) method was combined to intuitively show the logical relationship of many failure subsystems and their influences on each other by using multilevel hierarchical structure model and obtaining the critical subsystems. Finally, failure mode effects and criticality analysis(FMECA) was used to perform a qualitative hazard analysis of critical subsystems, determine the critical failure mode, and clarify the direction of reliability improvement.Through an example, the result demonstrates that the proposed method can be efficiently applied to system failure analysis problems.展开更多
针对电液伺服阀FMECA(Failure Medes,Effect and Criticality Analysis)中对整体危害度分析欠缺及无法对危害度、发生概率和检测难易度进行权重分配的缺点,用模糊综合评判的方法对电液伺服阀FMECA进行了改进.通过建立因素集、评价集和...针对电液伺服阀FMECA(Failure Medes,Effect and Criticality Analysis)中对整体危害度分析欠缺及无法对危害度、发生概率和检测难易度进行权重分配的缺点,用模糊综合评判的方法对电液伺服阀FMECA进行了改进.通过建立因素集、评价集和权重集等的步骤,实施模糊综合评判,得到评判结果,给出电液伺服阀各故障模式对整个伺服阀系统的危害度等级.根据评判的结果,可以确定各故障模式之间的相对危害度大小并进行排序,同时可以通过二级评判得到伺服阀故障的危害度等级,对进一步提高可靠性和保障性水平有积极的意义.展开更多
为解决贫信息背景下对系统进行故障模式、影响及危害性分析(failure mode,effects and criticality analysis,FMECA)受故障信息少、故障数据部分未知等问题限制,同时为有限定量危害性矩阵分析方法的缺陷,提出了适用于贫信息背景的灰FMEC...为解决贫信息背景下对系统进行故障模式、影响及危害性分析(failure mode,effects and criticality analysis,FMECA)受故障信息少、故障数据部分未知等问题限制,同时为有限定量危害性矩阵分析方法的缺陷,提出了适用于贫信息背景的灰FMECA模型。首先对危害性矩阵图进行规范化改进,统一横纵坐标轴量纲,提出危害度权重比概念以规范作图比例;然后在危害度计算中引入区间灰数,提出矩域灰点概念以表征故障模式难以确知的危害性;最后依照不确定型决策思想给出矩域灰点的一般排序规则,为贫信息背景的故障模式危害性排序提供解决方案。通过某航天飞机主发动机高压燃料涡轮泵进行案例研究,验证了所提模型的有效性。展开更多
基金Project(51275205)supported by the National Natural Science Foundation of China
文摘A new method of system failure analysis was proposed. First, considering the relationships between the failure subsystems,the decision making trial and evaluation laboratory(DEMATEL) method was used to calculate the degree of correlation between the failure subsystems, analyze the combined effect of related failures, and obtain the degree of correlation by using the directed graph and matrix operations. Then, the interpretative structural modeling(ISM) method was combined to intuitively show the logical relationship of many failure subsystems and their influences on each other by using multilevel hierarchical structure model and obtaining the critical subsystems. Finally, failure mode effects and criticality analysis(FMECA) was used to perform a qualitative hazard analysis of critical subsystems, determine the critical failure mode, and clarify the direction of reliability improvement.Through an example, the result demonstrates that the proposed method can be efficiently applied to system failure analysis problems.
文摘针对电液伺服阀FMECA(Failure Medes,Effect and Criticality Analysis)中对整体危害度分析欠缺及无法对危害度、发生概率和检测难易度进行权重分配的缺点,用模糊综合评判的方法对电液伺服阀FMECA进行了改进.通过建立因素集、评价集和权重集等的步骤,实施模糊综合评判,得到评判结果,给出电液伺服阀各故障模式对整个伺服阀系统的危害度等级.根据评判的结果,可以确定各故障模式之间的相对危害度大小并进行排序,同时可以通过二级评判得到伺服阀故障的危害度等级,对进一步提高可靠性和保障性水平有积极的意义.
文摘为解决贫信息背景下对系统进行故障模式、影响及危害性分析(failure mode,effects and criticality analysis,FMECA)受故障信息少、故障数据部分未知等问题限制,同时为有限定量危害性矩阵分析方法的缺陷,提出了适用于贫信息背景的灰FMECA模型。首先对危害性矩阵图进行规范化改进,统一横纵坐标轴量纲,提出危害度权重比概念以规范作图比例;然后在危害度计算中引入区间灰数,提出矩域灰点概念以表征故障模式难以确知的危害性;最后依照不确定型决策思想给出矩域灰点的一般排序规则,为贫信息背景的故障模式危害性排序提供解决方案。通过某航天飞机主发动机高压燃料涡轮泵进行案例研究,验证了所提模型的有效性。
