Research On Intake Pressure Control Technology Based On Expanded State Observer

The altitude test facility as a ground platform that simulates the flight test environment of aero-engines in high-altitude,is an important test equipment for ensuring the advanced nature of aero-engines and propulsion systems in China.The air intake pressure control system in the altitude test facility is the key to ensuring the validity and reliability of high-altitude simulation test.It can provide an air intake pressure that meets the requirements of the simulated flight environment and improves the air intake when the aircraft engine is tested at different flight altitudes and speeds.The quality of pressure regulation is an issue of great concern in aviation simulation test.In this paper,an aero-engine simulation test is carried out,because the engine thrust transients will cause strong external interference to the intake pressure control system and affect the quality of the intake pressure control.Intake environment simulation active disturbance rejection control method.Mainly carry out research from the following aspects:The first is to study the model of the existing high-altitude intake pressure control system,and to analyze the technical characteristics of the altitude platform transient state environment simulation and the reasons why it is difficult to achieve the altitude quality control indicators;the second is to easily measure the signal in the altitude intake pressure control system Contaminated by random noise,a measurement noise suppression algorithm based on improved tracking differentiator is studied.Using the fast tracking of the tracking differentiator and the non-linear characteristics of the Fal function filter to achieve the suppression of noise in the measurement signal;the third is to solve the problem of large-scale disturbances in the transition state of the intake pressure control system of the altitude test facility,and the switch is designed type extended state observer,by combining the advantages of linear and non-linear extended state observers,improves the ability of extended state observers to estimate large disturbances.The fourth is to solve the problem of parameter tuning of active disturbance rejection controller.Controller parameter tuning method of intelligent optimization algorithm.Based on the standard whale optimization algorithm,the adaptive weight,variable spiral update,and optimal neighborhood perturbation strategies are introduced to improve the global search capability of the whale optimization algorithm.It is applied to the active disturbance rejection controller,which improves the controller the dependence of the disturbance controller on the parameter setting;Finally,an intake pressure control algorithm based on the expanded state observer is designed,and a digital simulation test is performed on the intake pressure control system of the altitude test facility.By comparing the PID control algorithm,based on the expanded state The intake air pressure control method of the observer can effectively improve the control quality of the intake pressure in the altitude test facility,and the control system can suppress the influence of unknown interference,and realize the fast and stable control of the intake pressure of the altitude test facility.