Unknown Time-Varying Input Delay Compensation for Cold Rolling Mill System

An unknown time-varying input delay compensation control is developed for cold rolling mill system. Firstly, a hydraulic automatic gauge control (HAGC) model with mismatched uncertainties and unknown time-varying input delay is established. Then, a controller is proposed based on the integral of past values of control and a novel filter error signal, which can effectively compensate input delays. In stability analysis, suitable Lyapunov-Krasovskii (L-K) functions are chosen to achieve a ultimately ultimately bounded result. Finally, simulation results for HAGC system illustrate the effectiveness of the developed control strategy.