Reliability allocation is a very critical step of product development process for setting achievable reliability goals.However,most research on reliability allocation have ignored the correlation between faults in a complex electromechanical system.In view of this problem,this work proposed an optimization method of reliability allocation by combining Quality Function Deployment(QFD)and Failure Tree Analysis(FTA).First,a fault tree ofthe system is build,and failure mode of the system is discovered in the bottom events of the fault tree.Second,the failure mode in previous step is input into House of Reliability(HoR),and the correlation of faults and fault severity could be calculated in the HoR.Finally,according to the results of HoR,the fault severity of each component is transformed into the importance degree,and the system reliability target is allocated to each component on the basis ofthe importance degree.A case study of a transmission agent was conducted to illustrate the analysis and application processes of the proposed method.The result showed that this method made the distribution more reasonable by considered the correlation between failures.
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