Steady-state interaction indices for decentralized unknown

A set of steady-state interaction indices is defined and analyzed in this paper. These indices are found to play a very important role in characterizing solvability conditions of decentralized feedback control problems, and general interaction analysis of multi-loop systems. Furthermore, these interaction indices may be determined experimentally for stable plants, and therefore, no a priori knowledge of the plant model is necessary. Comparison with the relative gain array method shows that the indices are more complete and accurate to apply.