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Aircraft hydraulic system is an important part of an aircraft, its reliability is of great significance to the aircraft flight safety. This paper puts forward an aircraft reliability analysis method of hydraulic control system based on the GO methodology, which is based on the thorough research of GO methodology and aircraft hydraulic control system. Firstly, simplify the aircraft hydraulic control system principle diagram and establish the GO diagram. Then, establish the GO diagram according to the reliability of each component. Finally, calculate the reliability of the hydraulic control system based on the principle of GO diagram and operation rules and improve the reference for the design of aircraft hydraulic system. Introduction Aircraft hydraulic system is an important part of aircraft electromechanical system [1], which mainly provides power of control to the aircraft control system, landing gear system and reverser sleeve. It is frequently used frequently in the phase of flight and landing [2], its performance directly affects the safety of the aircraft flight. So it is very important to guarantee the reliability and safety of the aircraft hydraulic system that is vital to reduce the accidents and ensure the safety of flight. GO methodology is a kind of reliability analysis technology of system oriented by success and failure states [3][4], which can be applied to the reliability and security analysis of system with multi-state, timing, and feedback. GO methodology was firstly proposed by the United States science company named Kaman in the 60's [4]. In the 1980s, the United States Electric Power Research Institute (EPRI) developed a common program of GO methodology [5], which can be used to solve the reliability problem of complex systems. In the 90’s, scholars had studied the GO-FLOW methodology, which can be used to analyze the reliability of orderly and changing state system. In this paper, we first analyze the working principle of a certain type of aircraft hydraulic system, then convert the system schematic diagram to GO diagram. Finally, use the calculation formula of GO methodology, incorporate the operator and the signal flow in the GO diagram for quantitative calculation of the system and compute the reliability of hydraulic system. GO Methodology The main step of using GO methodology is to analyze the reliability of the system which includes the establishment of GO diagram and the GO operation whose two elements are operators and signal flow. The basic principle is the representation of the elements and the connections between the units with the operators and signal flows respectively and then conversion of the system diagram into GO diagram. Input the data of all operators and start GO operations which includes qualitative and quantitative calculation after establishing GO chart. GO methodology has 17 types of standard operators, as shown in Figure 1, including the name of the operator type , t operator type No. represented with number, the input signal represented with ‘S’, output signal represented with ‘R’. The property of operator includes type, data and operation rules, Type is the main property of the operator, which reflects the functions and characteristics of 4th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2016) © 2016. The authors Published by Atlantis Press 1602 the unit represented by the operator. Different operators represent different unit functions, data requirements and operation rules. The signal flow represents the input, output of the system unit, the connection of units and connects GO operators to generate GO diagram [6]. The property of the signal flow includes state value and probability. When the GO methodology is used for the multi-state system, the system has 0, , N in total of (N+1) state, 0 represents the state of advance, the state value 1, , N-1 represents a variety of successful states, N represents failure state, the corresponding state probability value is P (0), P (1), P (N);

Reliability Analysis of Aircraft Hydraulic Control System based on GO Methodology