Design of a robust controller for the VEGA TVC using the L1-Adaptive Control

Abstract

The purpose of this study is to Design of a robust controller for the VEGA TVC using the L1-Adaptive Control. The performance of the system with an L1 adaptive controller has been compared with that of a classical controller. The L1 adaptive controller optimization is an efficient as well as an effective approach for the design of a robust controller. The L1 adaptive controller ensures the robustness of the system against uncertainties, noise, and disturbances[10]. In a launch vehicle parameters like mass, thrust, and aerodynamic properties are time-varying. Due to the time-varying nature of these parameters gain scheduling is necessary with the classical control design methods otherwise the closed-loop system might become unstable for some values of these parameters. This procedure is costly and has no robustness. In addition to this, there are external disturbances also which can make the control system unstable. This is the reason why robust control is necessary. There is a trade-off between achievable performance and robustness. So, we need to compromise between required performance and robustness as per the requirement.

Keywords

• classical controller
• l1 adaptive controller
• rigid body model
• robustness and performance
• stability