Finite time convergence time-varying sliding mode attitude control method

An attitude control, limited time technology, applied in attitude control and other directions, can solve problems such as jumping and poor robustness, and achieve the effect of eliminating jumping problems and enhancing robustness.

Inactive Publication Date: 2016-01-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Poor robustness, high-frequency chattering, and jumping problems t

Method used

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  • Finite time convergence time-varying sliding mode attitude control method
  • Finite time convergence time-varying sliding mode attitude control method
  • Finite time convergence time-varying sliding mode attitude control method

Examples

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Example Embodiment

[0099] Example 1:

[0100] Using the hypersonic model of the Winged-Cone configuration published by NASA as the simulation platform, numerical simulation is carried out for its reentry flight process. In the simulation, the initial altitude is 28km, the speed is 2800m / s, the initial value of the attitude angle is [3120]deg, and the desired attitude angle is [000]deg. The initial attitude angular velocity is 0.

[0101] Because the flight conditions of the reentry aircraft vary widely, and often have uncertainties such as aerodynamic parameter perturbation, for the attitude control of the reentry aircraft, it is necessary to check not only the control performance under nominal conditions, but also the controller Can the system be controlled robustly and accurately when the environmental parameters change drastically and the system has strong uncertainty. In order to further verify the robustness of the system, a large external disturbance (directly applied to the control torque of...

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Abstract

The present invention discloses a finite time convergence time-varying sliding mode attitude control method, relating to a finite time convergence time-varying sliding mode reentry aircraft attitude control method based on a high order sliding mode observer, belonging to the technical field of aircraft attitude control. The invention discloses the finite time convergence time-varying sliding mode attitude control method, on the basis of aircraft attitude model feedback linearization, high-frequency vibration is weakened based on a low-pass filter, the arrival segment of slip mode control can be eliminated through introducing a time-varying item, the robustness of a system is enhanced, a jump problem caused by time-varying function first-order derivative discontinuity can be eliminated, and the time-varying sliding mode attitude control of finite time convergence is realized. According to the method, the reentry aircraft attitude control tracking error can be converged to zero in a finite time, the jump phenomenon caused by the first-order derivative discontinuity of a time-varying item can be eliminated, the high frequency vibration is weakened, and the robustness of a reentry aircraft attitude control system can be improved.

Description

technical field [0001] The invention relates to an attitude control method of a time-varying sliding mode reentry aircraft with finite time convergence, in particular to a time-varying sliding mode reentry aircraft attitude control method based on a finite time convergence of a high-order sliding mode observer, which belongs to aircraft attitude control technology field. Background technique [0002] The attitude control design problem of re-entry aircraft becomes extremely complicated due to the large range of flight conditions during re-entry flight, serious coupling between channels, strong nonlinear dynamic characteristics, various uncertain external disturbances and uncertain parameters. . The key to the design of re-entry vehicle control system is to solve the influence of the above-mentioned strong nonlinearity, strong coupling, fast time-varying and uncertainty on the system performance. [0003] Sliding mode control has the characteristics of global convergence, e...

Claims

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Application Information

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IPC IPC(8): G05D1/08
Inventor 盛永智薛晨琛刘向东
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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