Combined outputs variance constrained and input variance constrained design for flight control

Abstract

In this article, an algorithm combining two different variance constrained control strategies (i.e. output variance constrained: OVC controller and input variance constrained: IVC controller) is developed. Performance of the resulting novel control technique called as combined output and input variance constrained controller is evaluated on helicopters. Their linearized state-space models are used to see feasibility and efficiency of this new strategy (i.e., output and input variance constrained). Closed loop responses of some outputs and inputs of interest and also some outputs out of interest are investigated while using output and input variance constrained for air vehicle flight control system. Then, closed loop performance of output and input variance constrained is compared with respect to the two other classical control techniques (i.e. outputs variance constrained and input variance constrained). Finally, robustness of output and input variance constrained with respect to the modeling uncertainities is examined.