... disturbances can Robust Control, Theory and Applications 66 [38] Devarakonda, N. and Yedavalli, R. K., “Engineering Perspective of Ecological Sign Stability and its Application in Control Design”, ... R., Flight Stability and Automatic Control. McGraw Hill. Chap. 1998. Robust Control, Theory and Applications 64 [3] Skelton, R. “Dynamic Systems Control, ” John Wiley and Sons, New York, ... induction motor drive, Archives of Control Sciences,V2. Robust Control, Theory and Applications 36 time ]1[ct ]2[ct ]3[ct Fig. 9. Command signal issued by the interface....