[1]李敏睿,王海清,姚竣瀚,等.安全联锁设备SIL验证中的参数估计偏差分析*[J].中国安全生产科学技术,2021,17(6):24-29.[doi:10.11731/j.issn.1673-193x.2021.06.004]
LI Minrui,WANG Haiqing,YAO Junhan,et al.Deviation analysis of parameter estimation for SIL verification of safety interlock equipment[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2021,17(6):24-29.[doi:10.11731/j.issn.1673-193x.2021.06.004]
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安全联锁设备SIL验证中的参数估计偏差分析*
LI Minrui,WANG Haiqing,YAO Junhan,et al.Deviation analysis of parameter estimation for SIL verification of safety interlock equipment[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2021,17(6):24-29.[doi:10.11731/j.issn.1673-193x.2021.06.004]
《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]
- 卷:
- 17
- 期数:
- 2021年6期
- 页码:
- 24-29
- 栏目:
- 学术论著
- 出版日期:
- 2021-06-30
文章信息/Info
- Title:
- Deviation analysis of parameter estimation for SIL verification of safety interlock equipment
- 文章编号:
- 1673-193X(2021)-06-0024-06
- Keywords:
- Weibull distribution; exponential distribution; parameter estimation; IEC61508; safety integrity level (SIL); deviation analysis
- 分类号:
- X937
- 文献标志码:
- A
- 摘要:
- 为提高安全联锁系统（SIS）不可用度计算的准确性，减少SIL验证的不确定性偏差，研究参数估计置信度分别为70%和90%时功能安全标准IEC61508的恒定失效率算法与实际非恒定失效率（威布尔分布）算法结果的偏差。结果表明：在70%置信度时，采用指数分布算法计算PFDavg，比威布尔分布算法的计算结果偏大，2者的相对偏差平均值为68.01%；90%置信度时，2者的相对偏差平均值为42.63%，揭示功能安全标准IEC61508恒定失效率计算将显著高估SIS的不可用性，可能造成企业不必要的整改和相应的维护成本。
- Abstract:
- In order to improve the accuracy of unavailability calculation for the safety interlock system (SIS) and reduce the uncertainty deviation of SIL verification,the deviation between the calculation results of the constant failure rate of functional safety standard IEC61508 and the actual nonconstant failure rate (Weibull distribution) when the confidence of parameter estimation was 70% and 90% respectively was studied.The results showed that when the confidence was 70%,the calculation results of PFDavg by the failure rate of exponential distribution was larger than that of Weibull distribution,and the average relative deviation was 68.01%.When the confidence was 90%,the average relative deviation was 42.63%,It was revealed that the constant failure rate calculation of functional safety standard IEC61508 would significantly overestimate the unavailability of SIS,which may cause the unnecessary rectification and corresponding maintenance costs to the enterprises.
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备注/Memo
- 备注/Memo:
-
收稿日期： 2020-12-24
* 基金项目： 国家重点研发计划项目(2019YFB2006305)
作者简介： 李敏睿，硕士研究生，主要研究方向为安全联锁系统的可靠性分析。
通信作者： 王海清，博士，教授，主要研究方向为安全仪表系统、工艺灾害分析报警管理和可靠性RAM分析。
