M. Ramesh et S. Narayanan, Controlling chaotic motions in a two-dimensional airfoil using time-delayed feedback, J SOUND VIB, 239(5), 2001, pp. 1037-1049
In this paper, the chaotic motions of a two-dimensional airfoil are control
led by the application of the time-delayed continuous Feedback method of Py
ragas. The airfoil has cubic pitching stiffness and linear viscous damping
when kept in an incompressible fluid flow. Four control strategies are impl
emented with plunging displacement, plunging velocity, pitching angle, and
pitching velocity as the feedback signals. The control signal is applied to
perturb the airspeed parameter. The response of the system under these fou
r controls is compared. It is found that the feedback control signal derive
d from the pitching variables was found to be more effective in controlling
the chaotic motion of the airfoil. (C) 2001 Academic Press.