Intelligent FMEA based on model FIORN

FMEA automation and intelligence are studied, which is an effective way to improving FMEA in product development. Firstly, we formed an intelligent FMEA framework that is an intelligent failure effect inference mechanism based on the target system model as well as using expert experience and considering failure modes input and output relationship between products in the system. This framework is comprised of three parts, failure mode analyzer, failure effect analyzer and FMEA report creator. Failure effect analysis based on system models. We form two system modeling methods, system hierarchical model based on expert knowledge and fault input/output relationship net (FIORN) model which describes the relationship among products belonging to the same level in the system. The latter based on failures´ relationship and it could analyse correlated failures and common cause failures. Inference mechanism is presented based on these two models. Lastly, a prototype software - iFMEA (intelligent FMEA) is developed. Intelligent FMEA technique is used in analysis of an aircraft´s main gear system through which detail steps of intelligent FMEA method are described. System modeling method and inference mechanism are validated by this example.