基于STAMP/STPA的机轮刹车系统安全性分析

把机轮刹车系统在飞机降落过程中的安全性问题当作系统控制问题,不采用基于故障概率模型的事故模型,而是采用基于系统理论的事故模型和过程(STAMP),构建机轮刹车系统在飞机降落过程中的STAMP控制关联模型和系统理论过程分析(STPA)反馈控制回路。根据系统运行的上下文信息识别机轮刹车系统在飞机降落过程中的不安全控制行为,分析产生不安全控制行为的关键原因。对机轮刹车系统在飞机降落过程中的不安全控制行为进行仿真研究,结果表明了STAMP/STPA的有效性和用仿真方法分析安全性问题的可行性。

Safety analysis of wheel brake system based on STAMP/STPA

The safety analysis of wheel brake system in the aircraft landing process is regarded as a system control problem in this paper.Instead of the accident model based on failure probability,we use the systems-theoretic accident model and process (STAMP) accident model based on systems thinking to construct the STAMP control interaction model and the systems-theoretic process analysis (STPA) feedback control loop of wheel brake system.Furthermore,the unsafe control actions in the aircraft landing process are identified by the context of running system,and the causes of unsafe control actions are analyzed.Finally,the unsafe control actions of wheel brake system in the aircraft landing process are studied by simulation.It is shown that the STAMP/STPA method is effective and the simulation method is feasible with respect to safety analysis.