Decentralized Adaptive Stabilization of Large-Scale Nonlinear Time-Delay Systems With Unknown High-Frequency-Gain Signs

In this technical note, we propose a decentralized adaptive output-feedback stabilizer for a class of large-scale nonlinear time-delay systems without a priori knowledge of subsystem high-frequency-gain signs. The time delays can be in the outputs of subsystems and in the interconnections among subsystems. Global asymptotic stabilization results have been proved and a simulation example is given. The note enlarges the class of large-scale nonlinear systems for which global decentralized adaptive stabilizer can be designed.