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仪表着陆系统是飞机导航系统的重要子系统,其可靠性直接关系到飞机能否安全运行。为了准确描述故障对仪表着陆系统功能的影响程度,文中基于对仪表着陆系统接收机故障概率的分析,将模糊数学和故障树方法相结合,以AIR-BUS 320仪表着陆系统接收机为例,详述了模糊故障树的建模过程,并通过对其进行失效分析,给出了仪表着陆系统接收机的故障诊断算法。仿真结果表明,所建立的模型满足仪表着陆系统对接收机的故障诊断要求,且建模方法具有广泛的适用性。
Instrument landing system is an important subsystem of the aircraft navigation system, and its reliability is directly related to the safe operation of the aircraft. In order to accurately describe the impact of faults on the instrument landing system function, based on the analysis of the instrument landing system failure probability of the receiver, the fuzzy mathematics and fault tree method are combined to AIR-BUS 320 instrument landing system receiver as an example, the details The modeling process of fuzzy fault tree is described and the failure diagnosis algorithm of IFL receiver is given through the failure analysis. The simulation results show that the proposed model can meet the requirements of fault diagnosis of receiver in landing system and the modeling method has a wide range of applicability.