Abstract
Identification of the plants is not an easy task especially in the fields of process control. From this point of view, Kitamori developed a method of control system design based upon partial knowledge about controlled processes. However, it is difficult to control the oscillatory plant by Kitamori's control system design method. Because the Kitamori's partial knowledge is preferential in lower frequency range, then the higher order differential controller is needed for the oscillatory plant. Also there is a practical difficulty with the one. Besides, considering the knowledge of higher frequency about the controlled plant corresponds to increasing in controller's order.
In this paper, we develop a method of control system design, which have the following properties (1)-(3) in order to improve the above defects.
(1) Designed controller is given as a practical real rational transfer function.
(2) Closed loop characteristics are designed to match the desire model up to as higher frequency as possible, by means of varying limited parameters of controller.
(3) We guarantee the controller stability. (It is not always required)
Design methods for the PID type and I-PD type control systems are derived, and some results show the effectivenss of the methods. In the last chapter it is briefly mentioned the metod is applied to sampled-data control systems.
