Air Exhaust Environment Simulation of Altitude Test Facility Control Based on Model-Assisted Active Disturbance Rejection Control

In order to research the continuous simulation of flight trajectory, this paper designs a model-assisted active disturbance rejection control (ADRC) method for pressure control of altitude test facility (ATF) exhaust system. First, the ATF exhaust system is modeled, including the modeling of the exhaust pipe cavity and the modeling of the butterfly valve characteristics. Secondly, according to the affine nonlinear model of the exhaust system, the model-assisted ADRC method is designed. Then, based on the altitude command given by the actual task profile, the pressure command is obtained by the formula of height conversion pressure, and the mass flow rate command is given. Finally, the simulation of pressure control is verified by ADRC and model-assisted ADRC, while the simulation results are compared on the basis of the same controller parameters and observer parameters. The model-assisted ADRC method is 54.03% and 50% less than the ADRC method for the integral absolute error of the pressure and the integral absolute error of the disturbances, respectively. Therefore, the model-assisted ADRC control is more effective and more resistant to disturbances, which has engineering value in the study of continuous ATF simulation.