基于GO-Markov的飞机燃油闭环控制系统可靠性分析

飞机燃油控制系统是发动机的能量控制中枢，对飞机的飞行性能有重要影响。发动机电子控制器通过调节进入燃烧室的燃油流量来控制发动机的推力，同时旁通活门反向打开形成闭环反馈控制系统。利用GO法难以准确对其进行可靠性分析，为此提出一种基于GO法的系统可靠性计算方法。依据飞机燃油控制系统原理图建立GO模型，对闭环回路环节进行状态组合。利用马尔可夫状态转移过程获得状态转移矩阵，推导出闭环回路环节的稳态概率公式，并对某型飞机燃油控制系统进行可靠性计算。计算结果表明，在不改变GO法建模规则的前提下，该方法考虑了闭环回路反馈信号对系统可靠性的影响，能更真实地反映飞机燃油闭环控制系统的可靠性。

Reliability Analysis of Aircraft Fuel Closed-loop Control System Based on GO Methodology and Markov Process

Aircraft fuel control system is the energy control center of engine. The aircraft fuel control system has an important influence on the flight performance of aircraft. An engine electronic controller is used to control the thrust of engine by adjusting the fuel flow，while the bypass valve is reversed to open to form a closed-loop feedback control system. To enhance the reliability calculation accuracy of the system with closed-loop link，a system reliability calculation method is proposed based on GO (Goal-oriented) methodology. A GO model is established according to the principle diagram of aircraft fuel control system. The state transition matrix of closed-loop link is obtained by using Markov state transition process theory. The steady state probability formula of the closed-loop link is derived for the reliability calculation of a certain aircraft fuel control system. The results show that the proposed method considers the influence of closed-loop feedback signals on the system reliability while not changing the modeling rules of GO methodology，which can more truly reflect the reliability of the aircraft fuel closed-loop control system.