Flutter active suppression of twodimensional airfoil based on H∞controller and μ controller

LI Ming, YU Mingli, RUI Junjun

(College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and
Astronautics, Nanjing 210006, China)

Abstract: Aiming at the flutter active suppression of twodimensional airfoil, the control law of flutter active suppression and the wind tunnel experimental verification were researched. First，the airfoils equation of motion state was established based on Theodorsen unsteady aerodynamic theory. Then, the H∞ controller and the μ controller were designed based on the robust control theory and constituted the airfoil flutter active control system with pneumatic elastic system of twodimensional airfoil. Finally, the control effect of H∞ controller and μ controller was verified by numerical simulations and wind tunnel experiments. The results indicate that both H∞ controller and μ controller can make the flutter speed of twodimensional airfoil increase from 15.45 m/s to 27 m/s. Besides, the μ controller has shorter flutter active suppression convergence time and higher flutter active suppression wind speed, so the μ controller has better robust stability and robust performance.

Key words: flutter; robust control; H∞ controller; μ controller