Robust LQR control for stall flutter suppression: A polytopic approach * *This material is based on research sponsored by the US Air Force Academy under agreement number FA7000-13-2-0002 and FA7000-13-2-0009. The authors would like to acknowledge funding from Dr. Douglas Smith through the Air Force Office of Scientific Research Flow Control and Interaction portfolio. The grant of computer resources by the DoD HPCMO is gratefully acknowledged. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the French and US Air Force Academies or the French and U.S. Governments.