Abstract
For the hypersonic vehicle nonlinear attitude mode in reentry process with a strong coupling, aerodynamic parameter perturbations and non-deterministic, combine extended state observer and nonlinear law state error feedback, design the hypersonic vehicle MIMO-ESO ADRC attitude controller. Put interference such as uncertainty, coupling and parameter perturbations as “the sum of interference” ,use the extended state observer to estimate and dynamic feedback compensation, use nonlinear law state error feedback to inhibit residual of compensation. ADRC controller is charged without a precise model of vehicle , and without precise perturbation boundaries of aerodynamic parameters.Simulation results show that the MIMO-ESO ADRC attitude controller can overcome the impact of large-scale perturbations of interference and aerodynamic parameters, have good dynamic qualities and tracking capabilities, also have strong robustness.
Highlights
Uncertain items, unmodeled dynamics, coupling effects, parameter perturbations, and interference influences are considered as "summation interferences." extended state observer (ESO) are used for estimation and dynamic feedback compensation, and nonlinear state error feedback law (NLSEF) is used to suppress the compensation residuals
Selecting parameters according to ESO stability conditions can obtain good dynamic quality and tracking performance, and can overcome the influence of interference and aerodynamic parameters over a wide range of perturbations, and has strong robustness
Different from ordinary low-speed vehicles, each aerodynamic parameter term is a function of angle of attack and Mach number, and contains uncertainties caused by perturbation of aerodynamic parameters, which enhances the coupling between channels and leads to more complex and difficult controller design
Summary
The controller design has been more and more difficult due to the complex nonlinearity, the strong coupling between control channels and the uncertainties of aerodynamic parameters in the non-power re-entry process. In existing methods such as robust control[2,3] and adaptive control[4,5], the linearized model of the controlled system contains complex high-order derivative function, which is not convenient for practical application of engineering. Uncertain items, unmodeled dynamics, coupling effects, parameter perturbations, and interference influences are considered as "summation interferences." ESO are used for estimation and dynamic feedback compensation, and NLSEF is used to suppress the compensation residuals. Selecting parameters according to ESO stability conditions can obtain good dynamic quality and tracking performance, and can overcome the influence of interference and aerodynamic parameters over a wide range of perturbations, and has strong robustness
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