In view of the problem of coupling influence in the system safety analysis of aero-engines

the coupling fault modeling and safety analysis of aero-engines based on Simscape model were studied. Combined with the general characteristics of fault extension in model based safety analysis (MBSA)

two ways of fault external expansion and internal fault expansion based on modeling language of Simscape model were analyzed

so as to establish a model considering the coupling faults. Taking the main fuel control subsystem in full authority digital engine control (FADEC) as a research example

formal safety analysis of the independent and coupling fault was conducted. The results showed that the Simscape model of aero-engines system safety analysis based on the system design environment can be used as a common tool for system design and safety analysis

which can ensure the consistency of design and safety analysis. Based on the principle of fault mathematics

the model expansion method and modeling language can flexibly and quantitatively describe the component independency and coupling fault characteristics in different physical domains of the actual system. The safety analysis based on the extended fault model had the advantages of formalization

intuitiveness and objectivity.