Indirect (Q, S) Adaptive Control

Direct adaptive- Q design is applicable in those situations that a reasonably good model for the plant dynamics is available. It is geared towards tuning of controllers, and in particular for tuning controllers for new design criteria without sacrificing stability, and also towards disturbance rejection. In some situations, our limited knowledge of the plant dynamics may be the greatest obstacle on the route to better control performance. In such situations, the iterative and nested (Q, S) designs are needed.