Research on reliability of hydraulic system of certain aircraft based on GO methodology

DOI：10.7511/dllgxb201905008

 作者 单位 马骏,段富海,王海朋

使用GO法(goal-oriented methodology)分析了某型民用飞机液压系统的可靠性，并解决了GO法不能考虑系统内部反馈回路的问题．首先在飞机液压系统结构原理图基础上，对各个功能部件进行合理划分，建立了飞机液压系统的GO模型，采用布尔代数思想构造反馈回路的布尔运算式，解决了GO法不能考虑反馈回路的问题；其次进行了GO运算，得到了飞机液压系统的可靠度，并将不含反馈回路和含有反馈回路的系统可靠度进行了对比，证明了含有反馈回路的GO法精确度更高；再次构建了飞机液压系统的故障树模型，用最小径集法计算了系统的可靠度；最后将含有反馈回路的GO法计算结果与故障树法计算结果进行对比，验证了GO法在飞机液压系统可靠性分析和测试评估中的有效性和正确性．

The GO (goal-oriented) methodology is used to analyze the reliability of a certain type of civil aircraft hydraulic system, and the problem that the GO methodology cannot consider the internal feedback loop of the system is solved. Firstly, on the basis of the structural schematic diagram of the aircraft hydraulic system, the GO model of the aircraft hydraulic system is established based on the reasonable division of each functional part. The Boolean operation formula of the feedback loop is constructed with the idea of Boolean algebra, which solves the problem that the feedback loop could not be considered in the GO methodology. Secondly, the GO calculation is carried out to obtain the reliability of the aircraft hydraulic system. The comparison between the reliability of the system without and with feedback loop proves that the GO methodology with feedback loop is more accurate. The fault tree model of aircraft hydraulic system is established, and the reliability of the system is calculated by the method of minimum path set. The GO methodology is compared with the fault tree method to verify the availability and correctness of GO methodology in the reliability analysis and system safety evaluation of aircraft hydraulic system.