Adaptive Terminal Sliding Mode Control for Reentry Vehicle Based on Nonlinear Disturbance Observer

Binghe An,Yongji Wang,Lei Liu,Bo Wang

doi:10.1109/access.2019.2948963

Binghe An, Yongji Wang + Show 2 more

Open Access

https://doi.org/10.1109/access.2019.2948963

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 8	License type: CC BY 4.0

Affiliation: Huazhong University of Science and Technology

Abstract

The movement of reentry vehicle is disturbed by the atmospheric environment and changes of aerodynamic parameters. In this paper, an adaptive terminal sliding mode control method based on nonlinear disturbance observers is proposed, which is used to control the attitude of the reentry vehicle. Firstly, the attitude control system is divided into an attitude angular control loop and an angular velocity control loop. Then, novel finite time convergence nonlinear disturbance observers are designed to estimate lumped disturbances. In the design of control law, the super-twist algorithm is used to make the proposed terminal sliding mode variables converge to the origin within a finite time and reduce the chattering of the controller. The estimated value of disturbance is considered in the controller to attenuate the effect of disturbances on the vehicle. Last, the algorithm proposed is applied to reentry vehicle and a good performance can be obtained. The effectiveness and superiority of the proposed algorithm is demonstrated by numerical simulations.

Highlights

The velocity of the reentry vehicle is fast, and the flight is affected by wind disturbance, atmospheric density and change in the Earth’s gravitational force [1]
An et al.: adaptive terminal sliding mode control (ATSMC) for Reentry Vehicle Based on Nonlinear Disturbance Observer states and the sliding mode variable need to be obtained for completing the control law
To achieve an effective attitude control for reentry vehicles, an adaptive terminal sliding mode control law is proposed in this paper

Summary

INTRODUCTION

The velocity of the reentry vehicle is fast, and the flight is affected by wind disturbance, atmospheric density and change in the Earth’s gravitational force [1]. B. An et al.: ATSMC for Reentry Vehicle Based on Nonlinear Disturbance Observer states and the sliding mode variable need to be obtained for completing the control law. The disturbance observer based on the terminal sliding mode was proposed in [22], which can ensure that the estimation error converges in finite time. Another kind of sliding mode disturbance observer was used in the control problem of the reusable vehicle under uncertainties in [23]. New adaptive control laws based on the super-twist algorithm and the terminal sliding mode variables designed are proposed to control the attitude angles of the reentry vehicle. The proof of Theorem 2 is omitted, which is similar to the proof of Theorem 1

INTRODUCTION TO THE SUPER-TWIST CONTROL

The INNER ADAPTIVE TERMINAL SLIDING MODE

NUMERICAL SIMULATION

CONCLUSION