Research On Key Technologies Of The High Pressure Hydraulic Energy System Of Aircrafts

The high pressure of the aircraft hydraulic system is of great significance for the improvement of hydraulic system performance.This thesis studies the key technology of high pressure hydraulic energy system of aircraft,analyzes the difficulties and key technologies of high pressure aircraft hydraulic system,develops a set of test platform of high pressure hydraulic energy system,and carries out related simulation tests.The thesis is organized as follows:Chapter One,Outline of the aircraft hydraulic system architecture.High pressure hydraulic energy system is analyzed from the perspectives of background,necessity,and challenges.The development and research status of high pressure aircraft hydraulic system and its applications are summarized.The research contents and objectives of the subject are outlined.Chapter 2,Research on fluid pulsation in hydraulic energy system.The source of the fluid pulsation in the aircraft hydraulic energy system is analyzed,and the impact of key components on the pulsation is discussed.The theoretical flow model of piston pump is established and the effect of the inherent properties of the piston pump on the fluid pulsation is analyzed.The model of 11 piston pump is built and simulated in AMESim.The typical hydraulic accessories in the hydraulic system are selected,and their structural characteristics and effects on the fluid pulsation of the system are analyzed.The simulation model of the system and components are built in AMESim.The fluid-solid coupling simulation analysis of the pipeline at the outlet of the pump is carried out to obtain a stress-strain cloud diagram and the fixed positions of the pipeline are determined.Chapter 3,Analysis of thermal characteristics of hydraulic energy system.Comparison of several thermodynamic modeling methods of the aircraft hydraulic system.The factors of heat generation of the aircraft hydraulic system are summarized,and the corresponding oil temperature control measures of the aircraft hydraulic system are proposed.Establish energy loss and heat dissipation models for key components of hydraulic energy systems including piston pump,pipeline and load.The simulation of thermal characteristic of piston pump,bootstrap reservoir and load characteristic are carried out and analyzed.Chapter 4,Development of high pressure hydraulic energy system test platform.According to the overall goals and performance requirements of the subject,the principle design of the high pressure hydraulic energy system test platform is designed.The schematic diagram of the hydraulic energy system is designed,and its composition framework is established.Each module of the hydraulic system is determined,and three-dimensional model of the whole hydraulic system is built.The attenuation effect to pressure pulsation of key components of the hydraulic energy system is obtained through a set of experiments.The temperature tests of hydraulic energy systems are carried out and the temperature characteristics of piston pump and loads are obtained.Chapter 5,Summary and Perspective.The research progress and achievements are highlighted.Suggestions are also provided for the future work.