级联影响分析方法在EE舱通风冷却失效影响定级中的应用

民用飞机电子设备舱(EE舱)通风冷却功能是保证舱内各系统的电子设备安全、正常工作的基础功能。随着民用飞机航电系统集成化程度的不断提高，越来越多系统的电子设备放置在EE舱内，通风冷却功能也越来越重要。若通风冷却功能失效，如何确定电子设备舱内设备工作情况、如何确定失效设备对飞机的影响、如何确定该失效模式的影响等级，这些问题急需解决。通过制定确定失效场景、判断直接影响、分析间接影响和分析全机综合影响的原则，研究基于级联影响分析技术的EE舱通风冷却功能失效影响定级问题。通过分析EE舱通风冷却系统架构和功能，确定通风冷却功能失效机理，定义通风冷却失效场景。通过级联影响分析技术，分析通风冷却失效对全机系统和整机的影响，适用于通风冷却失效全机综合安全性评估，为通风冷却功能失效影响定级提供技术支撑。

Application of cascading effects analysis method in rating the failure ventilation and cooling system of EE bay

The ventilation and cooling function of civil aircraft electronic equipment cabin (EE cabin) is the basic function to ensure the safety and normal operation of electronic equipment in cabin. With the continuous improvement of avionics system integration of civil aircraft, more and more system electronic equipment is placed in EE cabin, and the ventilation and cooling function are becoming more and more important. If the ventilation and cooling function fail, how to determine the working condition of the equipment in the electronic equipment cabin, how to determine the impact of the failed equipment on the aircraft, and how to determine the impact level of the failure mode, these problems need to be solved urgently. Based on the principles of determining the failure scene, judging the direct impact, analyzing the indirect impact and analyzing the comprehensive impact of the whole machine, this paper studies the impact rating problem of EE bay ventilation and cooling function failure based on Cascading Effects Analysis Method. By analyzing the architecture and function of EE bay ventilation and cooling system, the failure mechanism of ventilation and cooling function was determined, and the failure scene of ventilation and cooling was defined. Using Cascading Effects Analysis Method, the influence of ventilation cooling failure on the whole machine system was analyzed, which was suitable for the comprehensive safety assessment of ventilation cooling failure, providing technical support for rating the influence of the ventilation and cooling function.