The study of control design method

This paper presents the robustness of the coefficient diagram method (CDM) which has been developed recently [Manabe, S, 1994]. We are supposed to approach the goal through comparative studies of several design methods. These consist of two parts: the first part is of competitive comparisons of classical controller design methods such as ITAE, LQR, and dominant second order pole placement, the second part is to compare the CDM with a H^∞ design. These comparisons are carried out in parameter space, root space and frequency domain and parametric uncertainties in both plant and controller are considered. We show that the CDM has some significant characteristics in robustness viewpoints. The results can be referred as a background when we want to choose a design method.