Safety analysis method of airborne structural health monitoring system based on STAMP-SOTIF

Airborne structural health monitoring system is an important means of safety monitoring of aircraft airborne structures, and the safety of airborne structural health monitoring system itself is becoming more and more important with the continuous development of the application of Prognostics and Health Management technology in civil aircraft. Traditional safety analysis methods, such as Fault Tree Analysis (FTA) and Failure Mode and Effect Analysis (FMEA), are mainly based on the linear perspective of the accident chain, which makes it difficult to accurately analyze the nonlinear problems such as system component interactions and human-machine interactions. Therefore, this paper proposes a safety analysis method based on STAMP-SOTIF, which combines the system hierarchy idea of System-Theoretical Accident Model and Process (STAMP) and the functional safety analysis of Safety of the Intended Functionality (SOTIF), to identify the system's safety hazards from multiple perspectives and levels, formulate comprehensive safety constraints, and continuously improve the safety design through closed-loop evaluation and optimization. The method has been successfully applied to an airborne structural health monitoring system project, which improves the safety of the system by comprehensively identifying potential safety hazards and proves its effectiveness and application value in engineering practice.