Order reduction of higher order interval systems by stability preservation approach

This paper proposes an extended approach for order reduction of high order interval models through stability preservation approach. The numerator and denominator of reduced order model are obtained by β & α table respectively. The proposed method is computationally simple and preserves the stability of reduced order system if higher order system is stable. A numerical problem is discussed to exemplify the algorithm. Further, approximation error between the higher order and reduced order system is determined to demonstrate the efficacy of the proposed technique.