Average consensus problems in networks of agents with delayed communications

The present paper is devoted to the study of average consensus problems for undirected networks of dynamic agents having Communication delays. By focusing on agents with integrator dynamics, the accent is put here on the Study of the time-delay influence: both constant and time-varying delays are considered, as well as uniform and non-uniform repartitions of the delays in the network. The main results provide sufficient conditions (also necessary in most cases) for the existence of average consensus under bounded Communicaiton delays. Simulations are provided that show adequation with these results. (C) 2008 Elsevier Ltd. All rights reserved.