The Goal-Oriented methodology (GO methodology) is an effective method for the reliability analysis of complex systems. It is especially suitable for the reliability analysis of multi-state complex systems containing the actual logistics, such as current, airflow and liquid flow. In order to solve the limitation that the GO methodology is not suitable for the reliability analysis of the system with feedback loop, the Boolean algebra idea is introduced to construct the Boolean operation formula of the feedback loop. In this paper, a certain type of civil aircraft flap hydraulic system with feedback loop is taken as the research object. According to the structural schematic diagram of the flap hydraulic system, the GO model of the flap hydraulic system is established. Next, the GO calculation is carried out to obtain the reliability of the flap hydraulic system. The comparison between the system reliability without feedback loop and that with feedback loop proves that the GO methodology with feedback loop is more accurate. The reliability of the system is analyzed by using the fault tree analysis (FTA) method, and the GO methodology with feedback loop is compared with the FTA method to verify the availability and correctness of the GO methodology in the reliability analysis and safety evaluation of aircraft flap hydraulic system.

中文翻译：

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GO方法在飞机襟翼液压系统可靠性分析中的应用

面向目标的方法（GO方法）是复杂系统可靠性分析的有效方法。特别适用于包含实际物流的多状态复杂系统的可靠性分析，如电流、气流和液体流动。为解决GO方法不适用于带反馈环系统可靠性分析的局限性，引入布尔代数思想构造反馈环的布尔运算公式。本文以某型民机襟翼反馈回路液压系统为研究对象。根据襟翼液压系统的结构示意图，建立了襟翼液压系统的GO模型。下一个，进行GO计算以获得襟翼液压系统的可靠性。没有反馈环和有反馈环的系统可靠性比较证明了有反馈环的GO方法更准确。采用故障树分析（FTA）方法对系统可靠性进行分析，并将带反馈回路的GO方法与FTA方法进行对比，验证GO方法在飞机可靠性分析和安全评估中的有效性和正确性襟翼液压系统。