ADAPTIVE FAULT ESTIMATION (FE) AND FAULT-TOLETANT CONTROL (FTC) FOR THE MOLTEN STEEL LEVEL IN A STRIP CASTING PROCESS

In this paper, the problem of adaptive fault estimation and fault-tolerant control is studied for molten steel level for twin roll strip casting systems with the inclined angle and actuator fault. Firstly, an intermediate estimator and an adaptive state observer are designed to estimate actuator fault and unknown states respectively. Then, based on back-stepping method, a neural fault-tolerant controller and adaptive laws are constructed, which can ensure that the output signal of the systems can track the reference signal under inclined angle and actuator fault. Finally, the effectiveness of the studied control strategy is verified by semi-experimental systems dynamic model.