Robust decentralized output feedback control of similar composite system with uncertainties unknown

The problem of robust decentralized output feedback control of an uncertain similar composite system is discussed. The system under consideration has uncertainties, which may be nonlinear, time-varying and bounded, but the bounds are unknown, in every subsystem and interconnections. Also the uncertainties meet a matching condition. The controller guarantees that the state of the system converges to the equilibrium point or the attractor centered at the equilibrium point of the system.