ABSTRACT
In control engineering research, problems of decentralized control and stabilization of interconnected systems are receiving considerable interest in recent years [151-154, 183, 184, 187, 188] where most of the effort is focused on dealing with the interaction patterns. Quadratic stabilization of classes of interconnected systems have been presented in [189, 190, 233] where the closed-loop feedback subsystems are cast into H∞ control problems. De-centralized output tracking has been considered in [153, 154] for a class of interconnected systems with matched uncertainties and in [234, 235] us ing norm-bounded uncertainties. When the interconnected system involves delays, only few studies are available. In [154, 189], the focus has been on delays in the interaction patterns with the subsystem dynamics being known completely. The same problem within the scope of uncertain systems was treated in [238], In [236, 237], a class of uncertain systems is considered where the delays occur within the subsystems.
