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Intelligent backstep switching control method for wide-area flight with unknown aerodynamics

A control method and intelligent technology, applied in the field of flight control, can solve the problems of poor practicability, achieve the effects of facilitating engineering applications, preventing jumps, and improving estimation accuracy

Active Publication Date: 2022-08-09
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor practicability of the existing wide-area flight switching system control methods, the present invention provides an intelligent backstepping switching control method for wide-area flight facing unknown aerodynamics

Method used

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  • Intelligent backstep switching control method for wide-area flight with unknown aerodynamics
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  • Intelligent backstep switching control method for wide-area flight with unknown aerodynamics

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Embodiment Construction

[0081] Now in conjunction with embodiment, accompanying drawing the present invention is further described:

[0082] refer to figure 1 The specific steps of the present invention are as follows:

[0083] Step 1: Consider a class of rocket based combined cycle (RBCC) aerospace vehicles, whose wide-area climb process can be divided into ejection mode, sub-ramjet mode, scramjet mode and rocket mode 4 stable modes.

[0084] The RBCC aerospace vehicle attitude subsystem is written as the following multiple-input multiple-output switching system

[0085]

[0086] Among them, the three-channel attitude angle X 1 =[θ ψ φ] T and attitude angular velocity X 2 =[ω x ω y ω z ] T are the state variables, θ, ψ, φ, ω x , ω y and ω z are pitch angle, yaw angle, roll angle, roll angular velocity, yaw angular velocity and pitch angular velocity; u σ(t) =[δ x,σ(t) δ y,σ(t) δ z,σ(t) ] T is the control input, δ i,σ(t) , i=x, y, z are the roll rudder deflection, yaw rudder ...

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Abstract

The invention relates to a wide-area flight intelligent back-step switching control method oriented to unknown aerodynamics, which is used to solve the technical problem of poor practicability of the existing wide-area flight switch control methods. The technical solution is to consider the wide-field flight multi-mode switching system with uncertain aerodynamic parameters, and design a stable mode switching controller based on the technical framework of the backstepping method; introduce a first-order filter to deal with the virtual control quantity and solve the problem of complexity explosion. ;Using the neural network intelligent system to approximate the uncertainty, constructing the prediction error representing the performance of the uncertain estimation based on the parallel estimation model, and using the prediction error to adjust the weight update law of the neural network; Designing the transition modal controller based on the inertial link to ensure more Soft switching of the modal controller; the invention combines the characteristics of the multi-modal process of the wide-area flight of the aircraft, and effectively improves the uncertainty estimation accuracy by designing the wide-area flight intelligent back-step switching control for unknown aerodynamics, realizes the smooth switching of the control, and ensures the flight safety.

Description

technical field [0001] The invention belongs to the field of flight control, and relates to an aircraft control method, in particular to a wide-area flight intelligent back-step switching control method for unknown aerodynamics. Background technique [0002] With the rapid development of aerospace technology, the envelope of the aircraft is getting wider and wider, making it possible for the aircraft to take off horizontally from the ground and fly in a wide area. During the wide-area climb, the speed of the aircraft continues to increase to hypersonic speeds, which will play an important role in long-distance rapid transportation, space travel, and global rapid strikes. [0003] During wide-area flight, the aircraft may face different power modes, aerodynamic configurations and flight tasks, resulting in the existence of multiple flight modes. Multi-modality is a common feature of the aircraft's wide-area climb process. It is necessary to build different models and design ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042Y02T90/00
Inventor 许斌程怡新尤明戴磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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