VALVE FUZZY RELIABILITY EVALUATION METHOD BASED ON THE INFLUENCE OF NON-CRITICAL STATE OF THE SYSTEM

YU ShuRong; LUO WeiYe; XUE RuiYuan; YIN SiMin; LI YongLin

doi:10.16579/j.issn.1001.9669.2020.06.015

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VALVE FUZZY RELIABILITY EVALUATION METHOD BASED ON THE INFLUENCE OF NON-CRITICAL STATE OF THE SYSTEM

更新时间：2022-09-22

- VALVE FUZZY RELIABILITY EVALUATION METHOD BASED ON THE INFLUENCE OF NON-CRITICAL STATE OF THE SYSTEM
- Journal of Mechanical Strength Vol. 42, Issue 6, Pages: 1369-1376(2020)
- 作者机构：
  
  1. 兰州理工大学石油化工学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2020.06.015
  CLC：
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YU ShuRong, LUO WeiYe, XUE RuiYuan, et al. VALVE FUZZY RELIABILITY EVALUATION METHOD BASED ON THE INFLUENCE OF NON-CRITICAL STATE OF THE SYSTEM. [J]. 42(6):1369-1376(2020)
DOI：

YU ShuRong, LUO WeiYe, XUE RuiYuan, et al. VALVE FUZZY RELIABILITY EVALUATION METHOD BASED ON THE INFLUENCE OF NON-CRITICAL STATE OF THE SYSTEM. [J]. 42(6):1369-1376(2020) DOI： 10.16579/j.issn.1001.9669.2020.06.015.

摘要

目前运用常规可靠性模型对阀门进行单一指标的可靠性评估,其结果只有两种状态:系统完全正常、系统完全故障。很难判断阀门系统处在从"完好"到"失效"之间的何种状态。同时忽视系统非关键状态对系统可靠度影响和仅用单一指标进行评估,会造成评估结果不够充分的问题。为此提出一种基于三重指标的阀门模糊评价方法。该方法将阀门系统失效概率PF、考虑系统非关键状态影响的失效概率PEF及平均故障间隔时间MTBF作为指标进行可靠性灰数聚类评估。其中考虑系统非关键状态影响的失效概率通过系统累计失效概率及期望状态转换次数求得。算例结果表明该方法可以很好的表达系统非关键状态对可靠度的影响且能得出系统可靠的具体处在何种水平。

Abstract

At present,the reliability of a single indicator is evaluated by a conventional reliability model.The results have only two states:the system is completely normal and the system is completely faulty.It is difficult to determine what state the valve system is between "good" and "failed".At the same time,ignoring the impact of non-critical state of the system on system reliability and evaluating method with a single indicator will result in insufficient evaluation results.Therefore,a fuzzy evaluation method based on triple index was proposed.The valve system failure probability PF,the failure probability considering the influence of non-critical states of the system P,EF, and the mean time between failures MTBF as the indicators to evaluate the reliability gray number clustering were considered.The failure probability considering the influence of the non-critical state of the system was obtained by the cumulative failure probability of the system and the number of expected state transitions.The experimental results indicated that the method can well describe the influence of the non-critical state of the system on the reliability and can determine the reliable level of the system.

关键词

失效概率可靠性评估模糊理论MTBF

Keywords

Failure probabilityReliability assessmentFuzzy theoryMTBF

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