Development Of The Test System For The Brake Control Servo Valve Of The Commercial Aircraft Landing Gear

Landing gear brake system is very important for ensuring aircraft taking off and landing safely, and its key component is the brake control servo valve. Development of the test system of the commercial aircraft brake control servo valves is useful to the aircraft safety, improving development progress of new aircrafts, developing new brake control servo valves.According to the ATP (product acceptance test procedure), the test system of the aircraft brake control servo valve is developed, and the system includes multi-function test of the valve. The main parts of the paper are given as:Chapter 1:The working principle and the configuration of the aircraft landing gear brake system are explained and the brake control servo valve is analyzed. Research status of the test system of brake control servo valves is summarized. Significance and goal of the project is given, and research contents and key technologies are briefly introduced.Chapter 2:Requirements, functional composition and layout of the test system are illustrated. The function modules of system namely hydraulic module, electronic module, data acquisition module are analyzed. Parameters of the brake control servo valve were listed, the acceptance test procedures and current servo test national standards were compared and the appropriate testing methods and procedures are analyzed. Hydraulic circuit and procedures of the test system are designed. Key components are calculated and selected. Model and simulation the test system are carried out to verify its correctness.Chapter 3:Research status of hydraulic system oil pollution monitoring is introduced. The oil pollution monitoring system of the test system is proposed; especially the gas content on-line monitoring system is analyzed and developed. Experiments of the gas content on-line monitoring of oil is carried and analyzed.Chapter 4:Development of the electrical module and the data acquisition is carried out. Based on the requirements of the test system, the electrical control logical is analyzed and electrical components are selected. The data acquisition system andⅤⅪbus are introduced, and type of the data acquisition and control module is selected as based on virtual instrument. Development of software and hardware of the data acquisition system is carried out.Chapter 5:The hydraulic system and mechanical structure of the test system are designed and setup. Some key mechanical components are checked by finite element software.Chapter 6:The paper is summarized, and some suggestions are given for further improvement.