Numerical computation and approximations of H/sup infinity / optimal controllers for a 2-parameter distributed model of an unstable aircraft

The numerical computation of H/sup infinity / optimal controllers for an unstable aircraft model with a time delay is discussed. It is shown that the optimal H/sup infinity / controller for this infinite-dimensional model can be computed from a finite determinantal formula. The properties of the optimal controller are examined. For a particular choice of weights, it is shown with an example that the optimal controller is stable and continuous. Approximations of this controller and suboptimality of the controllers obtained from these approximations are shown.<>