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New PFH-formulas for k-out-of-n:F-systems

机译:用于n:f系统中的k的新PFH公式

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摘要

Simplified formulas are popular for reliability analysis of safety instrumented systems (SISs). Both the IEC 61508 standard and the PDS-method provide such formulas for calculation of the average frequency of dangerous failures per hour (PFH). These formulas give reasonably accurate values for the PFH, but both of them also have significant weaknesses. The lEC-formulas can only be applied to systems with up to three elements while the PDS-formulas do not properly account for dangerous detected failures and are not able to include the effects of non-perfect proof-testing. This article presents new PFH-formulas for general k-out-of-n-systems, that take into account both dangerous detected and dangerous undetected failures and also allow for non-perfect proof-testing. The proposed PFH-formulas are compared with the IEC-formulas and the PDS-formulas for some selected systems in a case study, which shows that the new formulas represent an improvement compared to the IEC- and PDS-formulas.
机译:简化的公式在安全仪表系统(SIS)的可靠性分析中很受欢迎。 IEC 61508标准和PDS方法都提供了这样的公式,用于计算每小时危险故障的平均频率(PFH)。这些公式给出了PFH的合理准确值,但是它们两个都有明显的缺点。 lEC公式只能应用于最多包含三个元素的系统,而PDS公式不能正确解决危险的检测到的故障,并且不能包含非完美的证明测试的影响。本文介绍了适用于一般n个系统的新PFH公式,该公式考虑了已检测到的危险故障和未检测到的危险故障,并且还允许进行不完善的证明测试。在一个案例研究中,针对某些选定的系统,将拟议的PFH公式与IEC公式和PDS公式进行了比较,这表明与IEC和PDS公式相比,新公式代表了一种改进。

著录项

  • 来源
    《Reliability Engineering & System Safety》 |2013年第3期|112-118|共7页
  • 作者单位

    Department of Production and Quality Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway;

    Department of Production and Quality Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway;

    Department of Production and Quality Engineering, Norwegian University of Science and Technology, NO 7491 Trondheim, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    safety instrumented systems; reliability; PFH; proof-test coverage; DD-failures;

    机译:安全仪表系统;可靠性;PFH;证明测试范围;DD故障;

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