Variable Structure Adaptive Control of Wing-Rock Motion of Slender Delta Wings

Abstract

Based on the variable structure model reference adaptive control (VS-MRAC) theory, a new control system for the control of wing-rock motion of slender delta wings, using only roll angle measurement, is designed. For the derivation of the control law, it is assumed that the aerodynamic parameters and the structure of the nonlinear aerodynamic nonlinear functions in the model are unknown. Moreover, it is assumed that disturbance input is present in the system. It is shown that in the closed-loop system including the VS-MRAC system designed using bounds on uncertain functions, the roll angle tracks given reference trajectory and the wing-rock motion is suppressed. Digital simulation results show that the closed-loop system has good transient behavior and robustness to the uncertainties and disturbance input.