Global decentralized adaptive control for large scale nonlinear systems without strict matching

Decentralized adaptive control design is developed for a class of large-scale interconnected nonlinear systems which do not satisfy the strict matching restriction. To this end, large-scale nonlinear systems transformable to the decentralized strict feedback form are considered. The interconnections are assumed to be bounded by unknown polynomials in states. The controller maintains a global uniform boundedness of the model reference tracking error to a compact set which can be made arbitrarily small based on appropriate choice of control gains. In the regulation case, global asymptotic performance is achieved