基于FMECA方法的车用燃料电池发动机风险评估

Failure evaluation of vehicle fuel cell engines based on FMECA

在新能源汽车燃料电池发动机的产品开发过程中,对燃料电池发动机开展有效的风险评估对产品可靠性提升具有重要作用。今借助于失效模式影响及严重度分析(FMECA)方法对燃料电池发动机进行了风险评估。以某型燃料电池发动机样机为例,建立因素集、因素水平集、模糊因素水平评价矩阵、影响因素权重集等评估流程,利用模糊数学工具将FMECA的评价指标予以量化替代传统定性分析,避免了主观评价方法的随意性。运算得到一级模糊综合评价和综合危害等级,对该发动机9种典型失效模式的严重度评估和排序。分析结果与工程实践有较好的一致性,表明FMECA是一种适合燃料电池发动机可靠性开发过程中的风险评估方法。

Efficient failure evaluation plays an important role in product reliability improvement during the development of fuel cell engines for new energy vehicles.Failure evaluation of fuel cell engines was studied based on the failure mode effect and criticality analysis(FMECA).A typical fuel cell engine was used as a model,and factor set,factor level set,fuzzy factor level evaluation matrix and weight set for each influential factor were established.A fuzzy mathematical tool was employed to quantify the evaluation indicators instead of qualitative analysis to improve the robustness of traditional subjective evaluation methods.The first-level fuzzy comprehensive evaluation and hazard level were calculated,and severity of nine typical failure modes was evaluated and ranked.The analysis results are in good accordance with the engineering practice,which indicates that FMECA is a suitable method for failure evaluation of reliability improvement processes of fuel cell engines.