张晓爽,罗宿明,金向明,周 坤.基于风险优先数的航空发动机可靠性设计方法[J].航空发动机,2024,50(1):102-108
基于风险优先数的航空发动机可靠性设计方法
Aeroengine Reliability Design Method Based on Risk Priority Number
  
DOI:
中文关键词:  风险优先数  严酷度  故障模式发生概率  故障被检测难度  密封装置  风险改进项  航空发动机
英文关键词:risk priority number  severity  occurrence probability of failure modes  failure detection difficulty  sealing device  risk improvement items  aeroengine
基金项目:航空动力基础研究项目资助
作者单位
张晓爽,罗宿明,金向明,周 坤 中国航发湖南动力机械研究所湖南株洲 412002 
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中文摘要:
      为了解决故障模式和影响分析难以融入航空发动机设计中的难题,提高可靠性水平,在型号研制工作中摸索出利用故 障模式和影响分析中风险优先数的概念开展零部件某故障模式设计改进。运用风险优先数(RPN)的概念对设计故障模式和影响 分析中严酷度和故障模式发生概率划分了1~10级评分原则,增加了故障被检测难度,且结合航空发动机特点,对故障被检测难 度也划分了1~10级评分原则,得出了故障模式的风险优先数,确定了故障模式的优化排序,提出了确定风险改进项的方法。以 某发动机的密封装置为例,利用严酷度、故障模式发生概率和故障被检测难度等级评分原则,得出了密封装置各故障模式风险优 先数,确定了2项风险改进项。结果表明:利用严酷度、故障模式发生概率和故障被检测难度划分的1~10级评分原则进行风险优 先数计算,可得出风险改进项,为提高发动机的可靠性水平提供了方向。
英文摘要:
      In order to solve the difficulty in integrating failure mode and effects analysis into aeroengine design, and improve product reliability, the concept of risk priority number in failure mode and effects analysis was explored to conduct component failure mode design improvement during product R&D activities. Using the concept of risk priority number (RPN), the severity and occurrence probability of failure mode were classified into 1-10 ranking criteria. The failure detection difficulty was added, and the 1-10 ranking criteria were also established for it considering the characteristics of aeroengine. The risk priority numbers of failure modes were obtained, the priority of the failure modes was determined, and the method of determining risk improvement items was put forward. Taking the sealing device of an engine as an example, using the ranking criteria of severity, occurrence probability, and detection difficulty, the risk priority number of each failure mode of the sealing device was obtained, and two risk improvement items were determined. The results show that the risk prior? ity number calculated by using the 1-10 ranking criteria of severity, occurrence probability, and detection difficulty, can be used to obtain risk improvement items, which provides directions for improving engine reliability level.
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