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综述了国内外在板带热连轧机活套的高度和张力控制，作为一个互相耦合的。输入双输出的多变量控制系统，不断改进的过程及最新的研究成果。在给出传统的活套控制方法的基础上，重点介绍了各种活套高度及张力的解藕控制方法，主要包括：互不相关活套控制、活套最优多变量控制，以及建立在H∝理论基础上具有扰动补偿器的活会互不相关控制系统。
The height and tension control of looper in strip hot strip mill both at home and abroad are reviewed as a couple. Input dual output multivariable control system, continuous improvement process and latest research results. Based on the traditional control method of looper, the control methods of looper height control and tension control are mainly introduced. The control methods of looper control mainly include unrelated looper control, looper optimal multivariable control, Hα theory based on the disturbance compensator of the live irrelevant control system.