Adaptive Control for Longitudinal Dynamics of Hypersonic Vehicle at Subsonic Speeds

摘要

Abstract-Hypersonic vehicles are complex nonlinear systems with uncertain dynamics. This work presents a robust nonlinear adaptive control system for the operation of a hypersonic vehicle at subsonic speeds. The complexity of the dynamic system is considered in the design structure of the control in order to address robustness issues. The design decouples the longitudinal and lateral dynamics in order to control vehicle flight under specific conditions. In this paper, we only consider longitudinal dynamics, which are divided into aircraft speed subsystem and flight-path angle subsystem. A robust adaptive control design is implemented to provide asymptotic regulation of aircraft speed and flight-path angle. Adaptation is employed in this study because of its robustness properties. The stability analysis is performed based on a Lyapunov function candidate for the feedback closed-loop system. Simulations of the design indicates that it successfully provides flight control.