Research On Integrated Management Of Hydraulic Systems For Trunk Line Aircrafts

The development of the integrated management of hydraulic power systems is required for the high safety and reliability of the trunk line aircraft. As one of the key technologies of the developing trunk line aircraft, research on the integrated management of hydraulic power systems in this thesis was carried out.The scheme of the integrated management of aircraft hydraulic power systems was given. The Hydraulic Control Logic, Crew Alerting Logic and Central Maintenance Logic were designed and validated by logic simulation.According to the research content, this article is divided into the following six chapters.In chapter 1, the construction of the trunk aircraft hydraulic systems was introduced. The history and current research status of the integrated management of hydraulic power systems were reviewed. The goal, significance, contents, and method of the research were presented.In chapter 2, based on the detailed analysis of flight assignment and hydraulic users distribution of the trunk line aircraft, the flow rate demand of the hydraulic users and the supply capacity of hydraulic power systems were estimated. The researched objects of the integrated management were confirmed and the technical route was put forward.In chapter 3, the hydraulic logical control system was analyzed in detail, including system introduction, general conditions analysis, signal definition and the design of hydraulic control logic. Key technical problems namely the integrated signal definition based on conditions analysis and the priority tactic of the hydraulic control logic were analyzed and resolved.In chapter 4, the Crew Alerting System and the Central Maintenance System were studied thoroughly. Furthermore Crew Alerting Logic and Central Maintenance Logic were designed. Key technical problems namely the analytic relation among Crew Alerting Logic, Central Maintenance Logic and failure instances were analyzed and resolved.In chapter 5, computer simulation method and semi-physical simulation method were applied to test and verify various logics designed in the foregoing chapter. Computer Simulation Platform was established, and the implementation plan of Semi-physical Simulation Platform was designed. Key technical problems namely the computer simulation of failure instances and the semi-physical simulation of actual signals were analyzed and resolved.In chapter 6, Conclusions were given and suggestion on the further research was proposed.