Application of GO methodology in reliability analysis of aircraft flap hydraulic system

Abstract

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.

Reliability analysis of complex electromechanical systems: State of the art, challenges, and prospects

“…Although the GO method has been successfully used in RA, there are still some limitations for CES: (1) it is not suitable for system RA with feedback loops; (2) only the static dependences of a system, but not the dynamic relationships between components, can be modeled; (3) the original quantization algorithm is based on the joint probability calculation of all signal states, which makes the calculation process very complicated and redundant; (4) it is not applicable to system uncertainties caused by insufficient or fluctuating data. Aiming at the above shortcomings, Ma et al 122 introduced Boolean algebra into the GO method and proposed a system RA method with a feedback loop. The RA of a certain type of civil aircraft's flap hydraulic system was conducted and the GO model of the hydraulic system was established with a feedback loop.…”

Health Assessment of Landing Gear Retraction/Extension Hydraulic System Based on Improved Risk Coefficient and FCE Model

“…Based on statistics and a review of literatures [30][31][32][33][34] and some fault report data from The Aviation Herald (www.avherald.com (accessed on 31 December 2019)) for a specific year, Table 2 displays the most frequently occurring faults affecting the hydraulic retraction/extension of the landing gear. Defect frequency and component failure rate for the same kind of fault may be used to characterize the probability of occurring.…”