基于FMECA的水下轮缘推进器复合可靠性分析

Combined reliability analysis of underwater rim thruster based on FMECA

水下轮缘推进器可运行在较深海水的环境下,其可靠性不但受到加工制造的影响还受到严酷运行环境的影响。为了降低设备故障率,本文提出以FMECA和单元风险优先数(RPN)融合的可靠性分析策略。首先将水下轮缘推进器进行单元分解,详尽分析各单元风险优先数,并以此为作为加权因子,建立水下轮缘推进器可靠性模型以及进行各单元可靠性分配,对水下轮缘推进器的系统进行复合失效率分析,最终通过计算公式求得可靠性数据。此方法可综合考虑运行装备的多种因素,对水下轮缘推进器的实际可靠性运行具有指导意义,最终将该策略应用到一款自研的水下轮缘推进器研制过程,实践表明了该分析策略的有效性。

The underwater rim propeller can operate in deep seawater environment,its reliability is affected not only by manufacturing but also by harsh operating environment.In order to reduce the failure rate of equipment,a reliability analysis strategy based on FMECA and unit risk priority number(RPN)is proposed.Firstly,the unit decomposition of the underwater rim thruster was carried out,and the risk priority number of each unit was analyzed in detail,which was taken as the weighting factor to establish the reliability model of the underwater rim thruster and the reliability distribution of each unit.The compound failure rate of the underwater rim thruster system was analyzed,and finally the reliability data was obtained through the calculation formula.This method can comprehensively consider various factors of operating equipment,and has guiding significance for the actual reliable operation of underwater rim thruster.Finally,this strategy is applied to the development process of a self-developed underwater rim thruster,and the practice shows the effectiveness of this analysis strategy.