Research On Automated FMEA For Mechatronic Systems Based On Functional Role Model And Its Application

As one of effective techniques to improve weapon's supportability and maintainability, BIT depends on FMEA considerably. The earlier FMEA is performed, the better BIT is achieved. In this paper, a novel FMEA technique based on Functional Role Model (FRM), which can be performed from the concept design stage of weapon system thanks to its "Top-Down" ideology and therefore advantage BIT design, is proposed. Some related key theoretical and practical problems are investigated deeply and systemically. The main contents are described in brief as follow.1. Some FMEA methods are reviewed based on a detailed investigation on the related literatures. According to such an investigation, it is believed that functional model of artificial system is foundational to FMEA orienting to design for testability (DFT) & BIT design. Furthermore, the formal description of the extended FRM (EFRM) is given based on C. Lucas' initial FRM. And it's fault propagation disciplines are investigated.2. A new multi-modeling approach for EFRM, which utilizing functional information of engineering systems in a hierarchical mode likes C. Lucas, is proposed. Some experiments show that this method is effective and efficient in constructing EFRM.3. The fault propagation disciplines of feedback system are inferred from its principle and its corresponding FRM. And the range of applications of EFRM-based FMEA is extended.4. A black-box packaged model of EFRM, which expresses functional information of engineering system in a higher level, is proposed. As a result, the analysis ability of EFRM based FMEA is enhanced considerably.5. Based on the thorough researches on the function modeling and failure propagations discipline, a computer aided FMEA system is implemented by utilizing C++ Builder. It can be used to construct visible EFRM models and perform FMEA automatically.6. To realize the testability specifications of a mechatronic track and stable servo platform, a complete FMEA task is performed based on methods proposed in this paper. Some important results that are very helpful to further BIT design of the platform are obtained.In a summary, a general EFRM based FMEA approach is studied orienting BIT design systemically. Thus a considerably complete technical frame to perform FMEA is obtained fromour researches. Some experiments make us believe that BIT design tasks can benefit from such investigations.