Chebyshev Neural Network-Based Adaptive Nonsingular Terminal Sliding Mode Control for Hypersonic Vehicles

Ruimin Zhang,Qiaoyu Chen,Haigang Guo

doi:10.1155/2020/6830141

Abstract

This paper presents an adaptive nonsingular terminal sliding mode control approach for the attitude control of a hypersonic vehicle with parameter uncertainties and external disturbances based on Chebyshev neural networks (CNNs). First, a new nonsingular terminal sliding surface is proposed for a general uncertain nonlinear system. Then, a nonsingular sliding mode control is designed to achieve finite-time tracking control. Furthermore, to relax the requirement for the upper bound of the lumped uncertainty including parameter uncertainties and external disturbances, a CNN is used to estimate the lumped uncertainty. The network weights are updated by the adaptive law derived from the Lyapunov theorem. Meanwhile, a low-pass filter-based modification is added into the adaptive law to achieve fast and low-frequency adaptation when using high-gain learning rates. Finally, the proposed approach is applied to the attitude control of the hypersonic vehicle and simulation results illustrate its effectiveness.

Highlights

In recent years, hypersonic vehicles have received much attention because they are viewed as a cost-effective and promising method for access to space. e dynamics of hypersonic vehicles is severely nonlinear, fast time-varying, highly uncertain, and strongly coupled
To achieve finite-time convergence, terminal sliding mode control (TSMC) techniques have been proposed by introducing a nonlinear term into the sliding surface design [15, 16]
In [20], an adaptive nonsingular terminal sliding mode control scheme was proposed for the attitude control of the hypersonic vehicle

Summary

Introduction

Hypersonic vehicles have received much attention because they are viewed as a cost-effective and promising method for access to space. e dynamics of hypersonic vehicles is severely nonlinear, fast time-varying, highly uncertain, and strongly coupled. To achieve finite-time convergence, terminal sliding mode control (TSMC) techniques have been proposed by introducing a nonlinear term into the sliding surface design [15, 16]. In [20], an adaptive nonsingular terminal sliding mode control scheme was proposed for the attitude control of the hypersonic vehicle.

Results

Conclusion