The paper analyzes a variety of reasons differential fault automobile differential and establishes the corresponding fault tree by using Fault Tree Analysis of reliability theory. The failure spectrum of automobile differential is constructed through qualitative analysis of the fault tree. Meanwhile the study gives the theoretical methods about the solving of top event’s probability and bottom event’s importance for design, fault diagnosis and repair of automobile differential.
The paper introduce the analysis method of FMMECA and compile the table of the refrigerator aim at BD-248 refrigerator technological difficulties which appeared in the systems assembling process.Through qualitatively analysizing of the failure mode and mechanism of the refrigerator, the risk priority value of assembly process has be obtained,which provide a benefical theorical foundation for fault diagnosis and repair of refrigerator system.
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