Hypersonic aerocraft nonlinear control method based on high-gain observer

A high-gain observer, nonlinear control technology, used in adaptive control, general control systems, control/regulation systems, etc., can solve problems such as inability to meet progressive tracking and difficulty in proving system stability.

CN103592847AActive Publication Date: 2014-02-19TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-02-19

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Abstract

A hypersonic aerocraft nonlinear control method based on a high-gain observer comprises the steps that a dynamical model of a hypersonic aerocraft is determined; the speed, the altitude and an attack angle tracking error of the hypersonic aerocraft are defined; a set sigma is defined as a bicompact set representing that system states of the hypersonic aerocraft are within a set range, and when all system states and inputs of the hypersonic aerocraft is kept in the set sigma, an elastic modal vector has an Euclidean norm upper bound; a speed channel control system of the hypersonic aerocraft is designed, namely the high-gain observer and a speed channel controller are designed, the high-gain observer carries out on-line estimation on unknown functions and disturbance in a speed error system; an altitude channel and attack angle channel control system of the hypersonic aerocraft is designed. According to the method, good robustness for modeling robustness, parameter perturbation and external unknown disturbance of the hypersonic aerocraft is achieved, the calculation amount is small, adjustable control gains are rich, and most flight situations can be met.
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Description

technical field

[0001] The invention relates to a nonlinear control method for a hypersonic aircraft. In particular, it relates to a hypersonic vehicle nonlinear control method based on a high-gain observer for controlling a class of nonlinear hypersonic vehicle dynamic models. Background technique

[0002] The flight environment of hypersonic vehicles has a wide range of changes, the flight dynamics are complex, and they have extremely high nonlinear characteristics. In addition, there is a strong coupling between aerodynamics, propulsion systems, and thermal protection structures. The hypersonic aerodynamic force / aerodynamic heat will cause the thermoelastic deformation and vibration of the airframe structure, and the thermoelastic deformation and vibration of the airframe structure will have a serious impact on the aerodynamic force and the flight control system, making the near-space hypersonic vehicle an aerodynamic / structure / control system. Severely coupled systems p...

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Embodiment Construction

[0105] A high-gain observer-based nonlinear control method for a hypersonic vehicle of the present invention will be described in detail below in conjunction with the embodiments and drawings.

[0106] A hypersonic vehicle nonlinear control method based on a high-gain observer of the present invention uses a hypersonic vehicle control design model as a controlled object, and estimates system unknown functions and external disturbances through a high-gain observer. The high-gain observer is a special design method of the observer, and its main property is robustness to uncertain parameters of nonlinear functions. And when the observer gain is high enough, the output feedback controller has the performance of state feedback. The invention respectively obtains the bounded values ​​of the channel unknown functions of speed, height and angle of attack, and then uses a high-gain observer to estimate. The difficulty of this method is how to analyze the joint stability of the observe...