基于模糊逻辑的安全苛求系统失效模式与影响分析研究

摘要

针对传统RPN(风险优先数)方法在安全苛求系统FEMA(失效模式与影响分析)过程中的不足,提出一种基于FRPN(模糊风险优先数)的新方案,即运用模糊逻辑理论进行定量的FMEA.通过运用模糊加权几何平均计算失效模式的FRPN,据此对失效模式的风险程度排序,寻找影响系统安全性的主要因素,并将其作为改善对象.最后将该方法应用到高速铁路列控系统的FMEA过程中,结果表明,所提出的FRPN方法比传统RPN更加科学严谨,更能紧密联系应用环境,具有较高的科学性和实用价值.%Due to traditional RPN's (Risk Priority Number) incapability in the Safety Critical System's FEMA process, an FRPN-based new scheme is put forward. It uses the fuzzy logic theory to carry out quantitative FMEA; then uses fuzzy weighted geometric mean to calculate FRPN of failure modes to queue failure modes by their risk priority; then searches for major elements that influences the system security and regards them as targets to improve; finally applies the method to FMEA process of high-speed railway train control system. Experiment results demonstrate that the proposed FRPN method is stricter, closer to application environment, more scientific and practically more valuable than traditional RPN.