A New Adaptive Controller

In recent years, several attempts have been made in expanding the scope of adaptive control as well as in relaxing the assumptions under which stability and robustness of adaptive controllers can be achieved. Despite this, the underlying adaptive controller is complex, has an order twice as large as that of the plant being controlled, and requires several adjustable parameters, making its implementation impractical, or even infeasible. In this paper, we suggest a new controller, whih has a simple structure, can stabilize a class of linear time-invariant plants with unknown order, and possesses desirable robustness properties. The controller proposed is found to be attractive in practical applications such as flexible structures.