Abstract
Many methods to design the control system which are known up to now are formed under the assumption that there are no variation in the parameters and no noises in the controlled object. The variation means the measurment error and the change with time.
But, it is apparent that this assumption is not satisfied in many practical controlled objects. Therefore, some means are necessary to approximate the practical controlled object by an idealized model which satisfies this assumption.
This paper proposes one way to compose the model following system. This system can be applied to the practical controlled objects in which there are multi inputs and outputs and only the outputs can be observed directly. Its structure is such that the outputs of the practical controlled object follow the outputs of the model which is constructed with the measured values of the parameters of the practical controlled object.
In this system, the following error can be controlled at will. Consequently, we can consider the model following system as the new controlled object which has not the influence of the variation of parameters and noises. And in addition, all state variables can be observed directly, for they can be obtained from the model.
