Title Decentralized H ∞-controller design for nonlinear systems

©1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. 578 IEEE TRANSACTIONS ON AUTOMATIC CONTROL, VOL. 44, NO. 3, MARCH 1999 the PPC policy. In this case, one approach is to identify a stable service period and use it as a supervisor for another, more intuitive (e.g., PCLB) policy. As a supervisor, the purpose of the PPC policy is simply to guarantee stability of the system. In practice, the supervising PPC policy is invoked when some measure of system performance (e.g., the sum of the buffer levels) exceeds some preset threshold (i.e., once the sum of FMS buffer levels grows beyond some preset limit, a predefined, stable periodic service sequence is implemented)