Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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.

Active Publication Date: 2014-02-19
TIANJIN UNIV
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the elastic mode does not tend to a constant value, the control algorithm designed in this paper cannot satisfy the effect of asymptotic tracking, and it is even difficult to prove the stability of the system theoretically, so only a quasi-stabilization problem is considered in this paper (Journal: Journal of Guidance, Control, and Dynamics; Authors: L.Fiorentini, A.Serrani, M.A.Bolender, and D.B.Doman; Published: 2009; Title: Nonlinear Robust Adaptive Control of Flexible Air-Breathing Hypersonic Vehicles; Pages: 401-416 )

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hypersonic aerocraft nonlinear control method based on high-gain observer
  • Hypersonic aerocraft nonlinear control method based on high-gain observer
  • Hypersonic aerocraft nonlinear control method based on high-gain observer

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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.

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G05B13/04
Inventor 鲜斌张垚刘洋
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products