改进的区域安全性分析方法

Improved Zonal Safety Analysis Method

区域安全性分析(ZSA)是系统安全性分析的一个重要内容,对中国在研制大飞机的安全性设计有重要的意义。针对中国在区域安全性分析领域缺乏具体的、明确的实施方法这一现状,提出了改进的ZSA方法。一方面,明确了传统ZSA流程中故障模式影响分析(FMECA)和故障模式影响与危害分析(FMEA)对ZSA的信息输入方式,增加ZSA方法面向型号工程的可操作性;另一方面,从能量危险和系统硬件故障危险两方面开展危险源分析,并在此基础上,分析由于系统复杂性所导致各危险因素之间存在交错耦合关系而引起的危险,建立可全面分析区域内设备间相互影响的危险因素集,扩展了ZSA的内涵;将风险分析引入区域危险分析阶段,为制定分析准则,提高产品的安全性提供了更为详实、可信的依据。最后,简要介绍了该方法对某型飞机起落架系统的应用实例与分析结论。

Zonal safety analysis（ZSA） is important to system safety analysis,and it is especially required for the safety design of large airplanes now being developed in China.As the present ZSA method is not specific or definite enough to implement,an improved ZSA method was proposed in this paper. It first made definite how the results of FMEA and FMECA are input to ZSA in the traditional operation process,which made the method more practicable in the field of engineering.Moreover,hazard sources including both energy factors and failures of system hardware were analyzed,and hazard induced by coupling among those hazard factors in a complicated system was also analyzed.Thus a general set of hazard factors were established,which could be applied to analyze ZSA effect among the equipment inside a zone.Risk analysis was introduced to formulate rules of ZSA.The improved method could enhance safety of products,which was illustrated by an example of the undercarriage system on a certain airplane.