When using the risk priority number method to perform a criticality analysis of the failure modes of mechanical products, different subjective factors exist on the part of experts regarding the severity level (S), occurrence probability level (O), and failure modes. The estimation of the detection difficulty level (D) is different, which causes the problem of inaccurate evaluation of the criticality of failure modes. This study proposes a harm analysis method that combines group decision-making and fuzzy comprehensive evaluation. The similarity and difference between an individual expert and the group are used in group decision-making to assign the weight of the expert, thus reducing the influence of subjective factors on the evaluation results. On the basis of the fuzzy comprehensive evaluation method, the weight of three risk elements (S, O, and D) is determined, and a hazard ranking of the interval obtained by group decision-making is performed. The CA (criticality analysis) improvement method is used to analyze the hazard posed by low-temperature shut-off valves. Results indicate that this method can effectively assess the weak links of the low-temperature shut-off valves and improve the accuracy of the hazard evaluation in comparison with the risk priority coefficient method.

中文翻译：

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基于组合群决策和模糊综合评价的低温截止阀风险评估

当使用风险优先级数字方法对机械产品的故障模式进行关键度分析时，专家在严重性级别（S），发生概率级别（O）和故障模式方面存在不同的主观因素。检测难度等级（D）的估计是不同的，这导致了对故障模式的临界性的评估不准确的问题。本研究提出了一种将群体决策与模糊综合评价相结合的危害分析方法。在小组决策中，使用个体专家与小组之间的异同来分配专家的权重，从而减少主观因素对评估结果的影响。在模糊综合评价方法的基础上，确定了三个风险要素（S，O，确定D），并进行通过群体决策获得的区间的危险等级。CA（临界分析）改进方法用于分析低温截止阀带来的危害。结果表明，与风险优先系数法相比，该方法可以有效地评估低温截止阀的薄弱环节，提高危害评估的准确性。