Hypersonic aircraft robust control method considering attack angle asymmetric constraints

A hypersonic and robust control technology, applied in the field of flight control, can solve problems such as asymmetric constraints on the angle of attack of hypersonic vehicles

Inactive Publication Date: 2019-12-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of asymmetric constraint of hypersonic vehicle angle of attack caused by scramjet intake requirements, the present invention proposes a robust control method for hypersonic vehicle considering the asymmetric constraint of angle of attack

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  • Hypersonic aircraft robust control method considering attack angle asymmetric constraints
  • Hypersonic aircraft robust control method considering attack angle asymmetric constraints
  • Hypersonic aircraft robust control method considering attack angle asymmetric constraints

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Embodiment Construction

[0071] The present invention will now be further described in conjunction with the embodiments and drawings:

[0072] Reference figure 1 The robust control of the hypersonic vehicle considering the asymmetric constraint of the angle of attack of the present invention is applied to a kind of hypersonic vehicle dynamics model, which is realized by the following steps:

[0073] (a) Consider the longitudinal channel dynamics model of hypersonic vehicle:

[0074]

[0075]

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[0078]

[0079] among them, Represents thrust, Represents lift, Represents resistance, Represents pitching moment; V represents speed, γ represents track inclination, h represents altitude, α represents angle of attack, and q represents pitch angular velocity. δ e It represents the deflection angle of the elevator, and Φ represents the opening of the throttle valve. Represents dynamic pressure, ρ=6.7429×10 -5 Represents air density, Means the average aerodynamic chord length, S=17 means aerod...

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Abstract

The invention relates to a hypersonic aircraft robust control method considering attack angle asymmetric constraints. The hypersonic aircraft robust control method regards an attack angle as a systemstate by considering a height tracking situation, designs a control law on the basis of an asymmetric barrier Lyapunov function, introduces attack angle tracking error asymmetric constraint information into the control law, guarantees that errors are limited in a preset asymmetric interval, meanwhile, performing amplitude limiting on attack angle virtual control, combines the errors and the attackangle virtual control to achieve the attack angle asymmetric constraints, and guarantees the normal operation of a scramjet engine. Considering uncertainty of the system, a robust term is added to estimate an upper bound of an unknown nonlinear function in the design of a controller, and the influence caused by the uncertainty is compensated. The hypersonic aircraft robust control method designsthe PID controller for a speed subsystem to realize speed tracking.

Description

Technical field [0001] The invention relates to an aircraft control method, in particular to a robust control method of a hypersonic aircraft considering the asymmetric constraint of the angle of attack, and belongs to the field of flight control. Background technique [0002] Hypersonic aircraft has the characteristics of fast flight speed and strong defense penetration capability. It makes possible rapid global strikes in the military, and can be used for intercontinental rapid transportation in the civil field. Therefore, it has attracted wide attention from all over the world. Air-breathing hypersonic aircraft are mostly powered by scramjets, and the normal intake of scramjets has strict requirements for the aircraft’s angle of attack, and the engine is more prone to failure when the angle of attack is negative, so it is necessary to ensure that its amplitude is not Out of the given range. Existing studies have mostly failed to consider the angle of attack constraint for hyp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 许斌郭雨岩梁捷凡永华张栋
Owner NORTHWESTERN POLYTECHNICAL UNIV
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