| 安全联锁设备SIL验证中的参数估计偏差分析* |
| |
| 引用本文： | 李敏睿,王海清,姚竣瀚,毛奇.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. |
| |
| 作者姓名： | 李敏睿 王海清 姚竣瀚 毛奇 |
| |
| 作者单位： | (中国石油大学(华东） 安全科学与工程系，山东 青岛 266580) |
| |
| 基金项目： | * 基金项目: 国家重点研发计划项目(2019YFB2006305) |
| |
| 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。
|
| 关 键 词： | 威布尔分布 指数分布 参数估计 IEC61508 安全完整性等级 偏差分析 |
Deviation analysis of parameter estimation for SIL verification of safety interlock equipment |
| |
| LI Minrui,WANG Haiqing,YAO Junhan,MAO Qi.Deviation analysis of parameter estimation for SIL verification of safety interlock equipment[J].Journal of Safety Science and Technology,2021,17(6):24-29. |
| |
| Authors: | LI Minrui WANG Haiqing YAO Junhan MAO Qi |
| |
| Affiliation: | (Department of Safety Science and Engineering,University of Petroleum of China (East China),Qingdao Shandong 266580,China) |
| |
| 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. |
| |
| Keywords: | Weibull distribution exponential distribution parameter estimation IEC61508 safety integrity level (SIL) deviation analysis |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国安全生产科学技术》浏览原始摘要信息 |
|
点击此处可从《中国安全生产科学技术》下载全文 |
