Transactions of Materials and Heat Treatment

Title：Research on vibration characteristics and mechanism for rolling mill rolls under nonlinear action of hydraulic cylinder

Authors： Peng Rongrong

Unit： School of Education Nanchang Institute of Science and Technology Nonlinear Dynamics and Application Research Center Nanchang Institute of Science and Technology

KeyWords： rolling mill hydraulic cylinder nonlinear effect amplitude-frequency characteristics bifurcation and chaos

ClassificationCode：O322；TH113

year,vol(issue):pagenumber：2022,47(11):172-178

Abstract：

The structural characteristics and motion characteristics of hydraulic cylinder and the influence of related factors in the rolling mill vibration system were analyzed. The theoretical research shows that the nonlinear elastic action of the hydraulic cylinder can be described by the triple-well Mathieu-Duffing oscillator. At the same time, considering the influence of the structure and external excitation for rolling mill rolls, the chatter model of rolling mill under the nonlinear action of hydraulic cylinder was established by the nonlinear dynamic principle, and the influences of the first-order linear term, the cubic nonlinear term and the quintic nonlinear term of elastic force for the hydraulic cylinder on the amplitude-frequency characteristics of the rolling mill vibration system were analyzed by numerical simulation. Finally, the critical condition for the rolling mill system to enter chaotic motion in the sense of Smale horseshoe was obtained by the Melnikov′s theorem. And it was found that the rolling mill system had rich bifurcation behaviors such as periodic motion, multiple periodic motion and chaotic motion with the change of the quintic nonlinear term coefficient. Thus, the research results had a certain reference value for revealing the nonlinear elastic action of hydraulic cylinder and the vibration mechanism of rolling mill.

Funds：

2021年度江西省教育厅科学技术研究项目 (GJJ212504)；2021年度南昌工学院科技计划博士专项(NGKJ-21-02)；南昌工学院非线性动力学及应用研究中心阶段性成果（NGYJZX-2021-04）

作者简介：彭荣荣（1987-），男，博士，副教授，E-mail：15294476178@163.com

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