【摘要】 航电系统作为安全关键系统,必须对其进行共模分析和区域安全性分析,以满足系统的隔离性需求。随着航电系统综合化程度的提高,传统的共模分析和区域安全性分析方法主要依赖于分析人员对系统的理解程度,无法确保隔离性需求的完整性。同时由于安全性分析人员与系统设计人员对系统的理解不同而导致系统需求难以追溯,尤其在设计方案频繁变更的情况下,会出现安全性分析结果不准确、不一致的情况。针对上述问题,设计并实现了一种基于航电系统架构模型的安全性分析工具,通过采用物理架构中数据信号路径追溯的方法自动完成故障树建模,并基于此故障树完成共模分析和区域安全性分析,得出共模检查单和区域隔离性需求。以某飞机驾驶舱显示系统为案例的实验结果表明,该工具能对SysML语言描述的航电系统架构模型进行故障树自动建模,并能对需要隔离的系统组件进行标记,确保了共模分析和区域安全性分析结果的完整性。更多还原

【Abstract】 Common mode analysis and zone safety analysis need to be conducted to the safety critical avionics system in order to form new separation requirements.As the avionics system is becoming more and more integrated,the traditional common mode analysis and zone safety analysis methods can’t ensure the completeness of the separation requirements as they mainly rely on how well the analyzers understand the system.Meanwhile,the requirements of the system are hard to be traced due to the differences between the understanding of the safety analyzers to the system and that of the system designers,especially when the design changes frequently,safety analysis results are always inaccurate and inconsistent.Aiming at the above problems,a safety analysis tool based on avionics system architecture model was designed and implemented.Fault tree auto-modeling was conducted through tracing the data signal path in physical architecture.Then common mode analysis and zone safety analysis were conducted based on the generated fault tree,getting a common mode checklist and some zone separation requirements.The results of the case study on one cockpit display system indicate that the tool is able to conduct auto fault tree modeling based on the avionics system architecture model described in SysML,and also can mark the components need to be isolated,ensuring the completeness of the results of common mode analysis and zone safety analysis.更多还原