OUTPUT RESPONSE TUNING OF ONE-DEGREE-OF-FREEDOM AND 2-DEGREE-OF-FREEDOM CONTROLLERS USING AN H-INFINITY APPROACH

Most H(infinity) designs have concentrated on loss functions defining sensitivity and robustness. In this paper it is shown how the desired input-output response can be added to the loss function. This is first done with a one-degree-of-freedom controller and then extended to a t wo-degree-of-freedom controller. Suggestions are made for the choice o f weighting functions for these new components of the loss function, b y directly relating the weighting functions to the expected influences on the system.