Transactions of Materials and Heat Treatment

Title：Vibration characteristics and control on rolling mill roll system with dynamic clearance under influence of hydraulic cylinder nonlinear characteristics

Authors： Liu Fei Xu Shuhui Wang Xiaoting Wang Xinzhuo Feng Mengyu

Unit： College of Electrical and Control Engineering Xi′an University of Science and Technology

KeyWords： multi-segment elastic force dynamic clearance amplitude-frequency characteristic bifurcation characteristic feedback variable control vibration

ClassificationCode：TH113；O332

year,vol(issue):pagenumber：2023,48(8):176-184

Abstract：

In order to suppress the vibration in vertical direction of four-roll strip mill, firstly, considering the segmental nonlinear elastic force under the influence of dynamic clearance, the dynamic model of rolling mill roll system under the joint action of segmental nonlinear elastic force and dynamic rolling force was established, and the amplitude-frequency characteristic equation of the system was solved by using the average method. Then, the time-domain characteristics and frequency characteristics of the roll system when the elastic modulus of hydraulic oil changes were simulated with the actual parameters of rolling mill, and the influence laws on the vibration behavior of the roll system was obtained. Furthermore, the change laws of the amplitude-frequency response of the roll system under different hydraulic system parameter changes were compared, the influence of the hydraulic cylinder parameter change on the vibration behavior of the system was analyzed through the bifurcation characteristics, and the parameter interval was obtained when the system cycle was running stable. Finally, a state feedback controller was designed to realize the vibration control of the dynamic clearance rolling mill roll system. The analysis of amplitude-frequency characteristics and bifurcation characteristics shows that the controller can effectively weaken the influence of the dynamic clearance on the stability of rolling mill roll system, and suppress the chaotic behavior of the roll system, which provides a theoretical reference for suppressing the vibration of rolling mill roll system.

Funds：

国家自然科学基金资助项目 (51905416); 陕西省教育厅科学研究计划项目（20JK0758）

作者简介：刘飞(1986-)，男，博士，讲师,E-mail：liufei@xust.edu.cn;通信作者：续书慧(1996-)，男，硕士研究生,E-mail：xushuhui1996@126.com

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