Design of Adjoint-Based Laws for Wing Flutter Control

摘要

In this work, we developed a feedback algorithm for the control of flutter. We demonstrated the effectiveness of this control law in 2-D simulations. We also explored possibilities for the reduction in the number of actuators. The control methodology described in this Note using blowing and suction is more flexible than using traditional oscillating trailing-edge control surfaces. We can choose to have the jets at strategic locations along the surface of the wing or airfoil. These locations can be chosen for optimum impact by doing an adjoint analysis. The actuation performed using this algorithm is the smallest amount of actuation required for control purposes (as it is derived using an LQR algorithm). Moreover, the actuation performed is based on feedback from the current flowfield, and an estimate of its future evolution is based on the reduced-order model derived. This is a scientific way of determining control input. The feedback nature of control ensures that control is robust.