Fault Diagnosis And Case Analysis Of Aircraft Hydraulic System

As one of the most important systems on the aircraft, the hydraulic system is an integral part of the aircraft that it provide the essential pressure support to each pressure parts of aircraft in the process of flight and it ensure the normal operation of the aircraft. The structure of aircraft hydraulic system is complicated and type of the fault is various.Therefore, we can find the solution to the failure problem only through the complete failure analysis of aircraft hydraulic system so that we can reduce the failure problem of aircraft.The main content of this article is divided into the following sections:(1) The article introduced the composition and working principle of aircraft hydraulic system. Comparing the composition and working principle of hydraulic system of two main civil aircraft, A320 and 737 ng, it's helpful for us to understand hydraulic system better. By using scientific analysis method, we do the complete analysis for case of failure of hydraulic system.(2) By mainly use fault tree analysis, event tree analysis and logical chain analysis, we can summarize the cause of the problem and find out the ways to solve the fault. At the same time, we will also compare with different fault analysis method to summarize their merits and demerits.and by connecting with the different fault analysis results, we find out the cause and the procedure of fault of aircraft hydraulic system.(3) By using different analytical methods for five cases of failure analysis, we summarize the usefulness of different failure analysis methods. Fault tree analysis and logical chain analysis are both based on theory and they focus on the causes and the working status of failure that occurs. The event tree analysis focuses on the development of the events. As a result, some limitations exist in this failure analysis method in complex system fault analysis.The research methods in this article provide important reference value for the actul work and the results provide a new way of thinking for the way of fault analysis and the procedure of other similar systems. Meanwhile, they also provide a new theoretical and technical basis for improving the reliability and efficiency of failure analysis.