Research On Test And Control Technology Of Aircraft Power Supercharging System

The power system is the most important part of the aircraft,and its ground integrated measurement and control directly affects the carrying capacity and market competition of the aircraft.In the test stage of the power system of the original model aircraft,different test systems and software are needed due to the different needs and locations of the objects under test,which leads to a great amount of repeated investment in hardware equipment and personnel waste.The data in each test stage cannot be interconnected,so the utilization rate of data resources is low,resulting in the inflexible change of the power supercharging system.Taking the control of aircraft power system as the research object and according to the modular modeling idea and experimental simulation,a high-precision control strategy is studied,and a distributed measurement and control system are designed to realize the test and control of aircraft power supercharging.The main work of the thesis is as follows:(1)Modeling and characteristic research of aircraft power supercharging system.The characteristics of the proportional pressure-reducing valve of the key valve in the power supercharging system and the establishment of the transfer function between the controlling current and the pressure inside the controlled volume storage tank in the supercharging system are studied,Firstly,the pressurization loop of aircraft is designed,and the key valve proportional pressure-reducing valve is analyzed and modeled.Secondly,by analyzing the structure and working principle of the power supercharging system,the transfer function between the control quantity current and the internal pressure of the controlled quantity storage tank in the system is established,and the subsequent performance analysis of the power supercharging system is provided with theoretical support.(2)Research on high-precision control strategy of aircraft power supercharging system.Based on the relevant theoretical analysis of PID control,fuzzy control is proposed to realize the high-precision control strategy combining PID control and fuzzy control,and an improved fuzzy PID controller with self-tuning parameters is designed.Based on the mathematical modeling of the power system,the Matlab modular simulation is carried out to analyze the static and dynamic performance of proportional pressure reducing valve,and the simulation comparison between the high-precision control strategy and the conventional PID control on the control performance of the power system is realized.(3)Design of experimental platform and measurement and control system for aircraft power supercharging.The existing hardware resources are used to test and verify the high-precision control strategy,and an experimental platform for power supercharging is built.A distributed real-time measurement and control system including hardware,upper computer software and lower computer software design is designed for the power supercharging of the aircraft to be developed.(4)Experimental verification and analysis.In this thesis,the experimental verification and analysis are carried out through the simulation aircraft power pressurization experimental platform and the measurement and control system,It mainly makes quantitative analysis on the practicability and effectiveness of high-precision control strategy and conducts qualitative experiments through distributed real-time measurement and control system.It evaluates the accuracy and real-time performance of the system's high-precision control strategy,and the test results show that the aircraft's power supercharging system achieves the expected goal and can meet the requirements of engineering applications.