Abstract
In this paper, we deal with the problems of robust stabilizability and model output following control by using output feedback in the presence of additive and/or multiplicative unmodelled dynamics. An allowable range of unmodelled dynamics, which guarantees the uniformly boundedness of all signals in closed-loop by output feedback, is examined for the plant of which dominant part satisfies the almost strictly positive real (ASPR) condition. The design method of model output following control by output feedback is proposed for the plant with ASPR dominant part and unmodelled part which belongs to stabilizable range. The practical design method using precompensator is also considered in case that the dominant part of the plant is not ASPR.
