Abstract
This paper investigates the adaptive fuzzy vertical vibration suppression control problem for the six-high rolling mill system. Firstly, a new vibration model is established with the consideration of the coupling of mechanical and hydraulic systems and the unknown uncertainty on nonlinear rolling force. Then, the adaptive active control strategy is proposed to suppress chatter of the rolling mill under the input dead-zone and output constraints. The adaptive fuzzy logic systems are used to deal with the unknown nonlinear functions and the unknown system parameters. Based on the designed controller, the mechanical-hydraulic coupling rolling system is proven to be stable and the performance of the displacement of work roll is preserved. Finally, the simulation comparison shows the validity and the advantages of the proposed algorithm.
Highlights
Vibration often occurs in the high speed rolling process of strip steel [1]–[3]
Inspired by the above motivations, the adaptive fuzzy chatter suppression strategy for the mechanical-hydraulic coupling rolling mill system with input dead-zone and output constraints is investigated in this paper
SIMULATION RESULTS The vibration suppression algorithm proposed in this paper is applied in the 650mm cold rolling mill to verify the effectiveness
Summary
Vibration often occurs in the high speed rolling process of strip steel [1]–[3]. The categories of vibration mainly include torsional vibration [4], [5] and vertical vibration [6], [7]. Combining mechanical and hydraulic systems, [32] and [33] established linear 2-DOF(degree of freedom) coupling chatter models for 4-high rolling mill system and designed the corresponding robust vibration suppression controllers. By modeling the dead-zone input as a combination of a linear term and a disturbance-like term, [38]–[40] studied the memoryless controllers for the strict feedback nonlinear system with unknown asymmetric dead-zone input These factors have not been considered in the rolling vertical vibration system. Inspired by the above motivations, the adaptive fuzzy chatter suppression strategy for the mechanical-hydraulic coupling rolling mill system with input dead-zone and output constraints is investigated in this paper. Based on the design frame of backstepping, an adaptive fuzzy chatter suppression controller is proposed for the non-lower triangular rolling vertical vibration system subject to input dead-zone and output constraints, which can suppress the vibration effectively and ensure the stability of the system.
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