Two-degree-of-freedom control of an actively controlled wind-tunnel model

A robust two-degree-of-freedom controller is designed for an actively controlled wind-tunnel model. The wind-tunnel model is geometrically similar to the High Incidence Research Model that was used in the design challenge set up by the Group for Aeronautical Research and Technology in Europe. The design procedure with which the two-degree-of-freedom controller is designed is based on standard two -degree-of-freedom H-proportional to loop shaping. This design procedure enables the designer to meet time-domain specifications, defined with respect to the transfer matrix from references to controlled outputs (or a subset of the controlled outputs), accurately and robustly, subject to a robust stability constraint. The controller is flight tested and very satisfactory performance is achieved.