Research On Control Algorithm And Experiment Of Gas Flow Regulation System For Variable Flow Ducted Rocket

Solid rocket ramjet is widely used in various supersonic vehicles because of its many advantages,especially in tactical missiles.Gas generator is the first place where oxygen-poor propellant is burned.Whether it can actively control the gas flow is a key technology to determine the performance of the engine.Solid rocket ramjet with flow controllable function can fly in large airspace,wide Mach number and high angle of attack,which has attracted great attention of military powers.Aiming at sliding disc valve variable flow gas generator,this paper focused on gas flow control principle,design of gas flow control system,modeling and characteristic analysis of control system,analysis of generation mechanism and influencing factors of anti-regulation,control algorithm design of control system and experiment of gas flow control system.(1)Research on gas flow control principle of sliding disc variable flow gas generator.The control system of the gas generator was designed,including the design of the electric actuator driving the valve body rotation,the construction and manufacture of the embedded hardware platform,the design of embedded software and the design of the host computer acquisition system.The feasibility of the control system was verified by the physical platform.(2)Steady state model and dynamic model of gas generator with adjustable gas flow rate were studied.From the established model,it can be seen that the system is a strongly nonlinear time-varying system.The dynamic and static characteristics of the model were simulated.It was pointed out that the non-linearity of burning rate was the main non-linearity factor,and the time-varying of free volume was the main time-varying factor.At the same time,from the simulation results,it was found that anti-regulation occurred in the process of gas flow control.(3)Research on the influence of anti-regulation on the system.In order to explore the method of reducing the anti-regulation of gas flow,based on the principle of flow control and the definition of anti-regulation,the fundamental and direct causes of anti-regulation of gas flow were analyzed by establishing anti-regulation model,as well as the starting and ending conditions of anti-regulation.Based on the research results,the influencing factors of anti-regulation were analyzed.The simulation results showed that the anti-regulation theory is correct and provides a theoretical basis for the design of the algorithm.(4)The optimal design of position controller parameters of brush DC motor was carried out.The nonlinear model between position controller parameters and motor response performance was identified by using the kernel limit learning machine,and the controller parameters were optimized by using artificial bee colony algorithm.The traditional PID controller was not suitable for the non-linear time-varying system,so in order to improve the control effect of the gas flow regulation system,this paper proposed an innovative fuzzy TD-PID control algorithm on the premise of restraining anti-regulation.The traditional PID controller and the designed controller were used to simulate the large deviation non-linear model of the system.The results showed that the proposed algorithm was more suitable for the gas flow control system.(5)Design and experimental study of experimental verification system for gas flow control.The experimental scheme was designed and the engine ignition experiment is carried out.The experimental results were analyzed in detail,which verified the correctness of the theoretical research and provided valuable reference for the follow-up research.