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Safety analysis for the fly-by-wire system based on the Simulink model

  

  • Received:2022-04-26 Revised:2022-09-25 Online:2022-09-30 Published:2022-09-30
  • Contact: LU Zhong

Abstract: Safety analysis is the main method to improve safety in the process of aircraft development. It’s also an important method to show that the design meets the safety requirements of airworthiness standards. Traditional safety analy-sis methods lag behind the system design process and are significantly dependent on the skills and experiences of analysts. They cannot meet the requirements of safety analysis for modern complex systems gradually. This paper presents a model-based safety analysis method for the fly-by-wire system. The nominal model and extended model of the fly-by-wire flight control system are established with Simulink. Failure mode and effect analysis can be conducted by injecting the single fault mode and evaluating the impact through the system response. An analy-sis method of obtaining the minimum cut sets is proposed based on the system response by traversing all failure combinations. Finally, the correctness and effectiveness of the proposed method are illustrated by an engineering case. Compared with the classical Markov method, our method can generate safety analysis results automatically and avoid the dependence on designers' experience. In addition, our method has higher accuracy. What’s more, with the change of design, our method can update the results of safety analysis automatically, which saves avoid the tedious work of re-modeling and re-analysis.

Key words: system safety analysis, flight control system, fault injection, state traversal, recursive method, minimal cut set

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