Showing papers by "Yasmina Bestaoui published in 2012"
TL;DR: The natural wind proved itself to be a major parameter to successful flights of airships, and the stochastic part considered as perturbations, while the deterministic component is introduced into the motion planner.
Abstract: The natural wind proved itself to be a major parameter to successful flights of airships. It mostly affects a trajectory through its speed. In general, the wind speed can be modeled as a sum of two components: a nominal deterministic component (available through meteorological forecasts or measured with a Doppler radar) and a stochastic component, representing deviations from the nominal one [1, 2]. The closed loop controller takes care of the stochastic part considered as perturbations, while the deterministic component is introduced into the motion planner. In general, the optimality of a trajectory can be defined according to several objectives, like minimizing the transfer time or the energy. Traditionally, trajectories are optimized by the application of numerical optimal control methods that are based on the calculus of variations.
9 citations
24 Dec 2012
TL;DR: The proposed control laws guarantees the robustness of the system with respect to different uncertainties due to model and unknown external parameters, as well as guaranteeing the performance of proposed control strategy.
Abstract: In this paper, we study the trajectory tracking problem of autonomous small airplanes in presence of unknown wind gusts. The vehicle is represented by its center of gravity, and the mathematical translational model is derived using Newton's second law. The controller is designed using Robust Control Lyapunov Function and Sontag's feedback stabilizing universal. The proposed control laws guarantees, by structure, the robustness of the system with respect to different uncertain- ties due to model and unknown external parameters. Numerical simulations are performed to demonstrate the performance of proposed control strategy.
2 citations