Operator based nonlinear control of processes with unknown input disturbances

In this paper, robust nonlinear control using operator based right coprime factorization for processes with unknown input disturbances is studied. In order to estimate the disturbances, an estimated unit which is described by stable operator is given. Since the disturbances are unknown, a new robust condition using robust right coprime factorization is proposed to the unit. As a result, based on the proposed condition, a desired estimation of the disturbances is obtained. A numerical example is presented to validate the effectiveness of the proposed method.