Abstract
Simple adaptive control (SAC) method is fundamentally applicable to the plants which satisfy the so-called almost strictly positive real (ASPR) condition. This condition is not satisfied by most of actual plants. However, as being indicated by several researchers, the non-ASPR plant can be made ASPR approximately by implementing a parallel feedforward compensator to the plant. For SISO systems, a practical design method for SAC systems with parallel feedforward compensator has been proposed and high control performance has been obtained. In this paper, we deal with a problem concerning actual realization of MIMO SAC system. A practical design procedure of parallel feedforward compensator, which makes non-ASPR MIMO plant into ASPR approximately, is considered so that practical realization of MIMO SAC is attained for broad class of MIMO plant. The effectiveness of the proposed method is confirmed through numerical simulations for the 2-inputs 2-outputs systems.