Evolution mechanism of Mission Safety Based on SST

Faced changing operational requirements, the insufficient safety of aviation equipment has been repeatedly exposed. The fundamental to ensure the safety bottom line is to ensure the safety of the “software-hardware-environment-liveware” (SHEL) system during the mission execution and the countermeasure is to study the occurrence mechanism of safety events around the constraint effect of missions on safety. Therefore, an aviation equipment mission safety model is established to study the safety events during mission execution. The definition of mission safety (MS) and the mathematical foundation of the instability domain is given based on the Safety Structure Theory (SST) and three-way decision-making theory. And then the evolution mechanism and evolution process of safety events are analyzed. This model can be used in the evolution of safety events, the construction of mission safety analysis platform, the evaluation and prediction, accident prevention and process control.