NONLINEAR OPTIMAL CONTROL OF WING ROCK INCLUDING YAWING MOTION

A nonlinear feedback optimal controller is designed for suppressing the wing rock motion, using Hamilton-Jacobi optimality equation. A positive definite Lyapunov function is derived for the fifth order system, which includes selfinduced rolling motion, yawing motion and an aileron actuator model. The derived nonlinear controller is seen to be robust with respect to variations in the aerodynamic and actuator parameters.