Gas Flow Regulation Of Solid Fuel Ducted Rocket Integrated Control With Aircraft

Thrust and flow control is the key technology of the throttleable solid fuel ducted rocket.Domestic and foreign Scholars have done a lot of research on it.The anti-regulation of the gas flow during the classic control will cause the engine performance to decline and make the engine thrust anti-regulation occurs,could affecting the flight characteristics of the aircraft.In order to analyze the influence of the engine adjustment on the aircraft,an aerodynamic model,a rigid body six-degree-of-freedom trajectory model and a flight speed control model for an aircraft using an throttleable ducted rocket were established.Mathematical models of the flow control,the gas generator’s pressure control and thrust control of the ducted rocket were established.The pressure overshoot of the gas generator and the negative regulation characteristics of the gas flow were analyzed.For the closed-loop control of the pressure of the gas generator,a PID controller and a fuzzy-PID controller wer established respectively,and the pressure overshoot characteristics and response characteristics of the two controllers are compared and analyzed.It was proved that the fuzzy-PID controller can effectively eliminate the pressure overshoot,and the response is faster than PID control.Aiming at the process of anti-regulation of gas flow,the response of its flow error and change in flow error was analyzed.The relative error was used as a criterion for anti-regulation.A fuzzy-PID control systerm was established and was proved that it can efficiently suppress the anti-regulation of the gas flow rate.The fuzzy-PID controller for engine gas flow was placed in the aircraft’s speed control loop for cascade control simulation.It was proved that the flow controller had a good tracking effect on the flow command,and the aircraft could achieve closed loop control of the Mach number.The method of using gas valve opening and gas generator pressure feedback to estimate gas flow and perform closed-loop control of the flow can suppress the negative regulation of gas flow even while the flow cannot be measured.This method can improve the overall performance and reliability of the engine.