Combined reliability analysis of underwater rim thruster based on FMECA
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 underwa-ter 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 devel-opment process of a self-developed underwater rim thruster,and the practice shows the effectiveness of this analysis strategy.
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