Automatic Failure Mode Based On The Functional Role Model Impact Analysis And Its Implementation

Failure modes and effects analysis (FMEA) is necessary for designing BIT (Built-in Test) systems. Unfortunately, almost all the existing FMEA systems are not very suitable for BIT tasks due to their natures of orienting to the detail design phases. In this paper, a new FMEA approach is proposed based on Lucas's hierarchical functional models. The theory and analysis method are studied in detail. Meanwhile, a computer aided analysis system is implemented based on such researches.Firstly, some FMEA methods are investigated and outlined based on thorough probing and analyzing on related literatures. The urge for FMEA oriented to BIT is also highlighted based on such proposed FMEA methods. Based on BIT requirement and generalized process for FMEA, a functional model based approach for FMEA is prompted.Secondly, a new functional mode, directed functional role model (DFRM), is proposed based on Lucas's hierarchical functional model. The guidelines of constructing DFRM are also outlined to improve the efficiency of FMEA.Thirdly, the failure propagations discipline is researched by utilizing qualitative algebras. Some failure propagations rules are achieved based on such researches. Two typical examples including a resistor network and an electrical gear pump are tested.Finally, based on our thorough researches on DFRM, a computer aided FMEA system is implemented by utilizing Java. The electrical gear pump example is analyzed in this system. The results show such FMEA system is more suitable for BIT tasks.