热连轧机工作辊水平-垂直非线性振动特性及抑制

发布时间：2018-02-01 20:58

本文关键词： 热连轧机变摩擦力非线性振动特性振动抑制　出处：《中国机械工程》2017年16期 　论文类型：期刊论文

【摘要】：基于振动情况下轧制界面水平-垂直方向摩擦力模型和动态轧制力模型,考虑轧机的结构和工作辊轴承座与牌坊立柱间的摩擦力等因素的影响,建立了热连轧机工作辊水平-垂直系统的非线性振动模型。运用平均法求解得到幅频特性方程,分析外扰力和非线性参数等因素对系统幅频特性的影响,为抑制轧机工作辊水平-垂直振动提供理论指导。通过分析李雅普诺夫指数和位移分岔图,发现系统随外扰力幅值变化表现出周期、倍周期和混沌等不同运动状态。最后,通过分析工作辊轴承座与牌坊立柱间有无衬板间隙这两种情况下的幅频特性及衬板间隙对系统振动的影响规律,提出一种抑制工作辊水平振动和垂直振动的方法,仿真和实验结果均表明该方法有效。
[Abstract]:Based on the horizontal and vertical friction model and dynamic rolling force model of rolling interface under vibration, the influence of rolling mill structure and friction between work roll bearing seat and arch column is considered. The nonlinear vibration model of the horizontal and vertical system of the work roll of hot strip mill is established. The amplitude-frequency characteristic equation is obtained by using the averaging method, and the influence of the external disturbance force and nonlinear parameters on the amplitude and frequency characteristic of the system is analyzed. Through the analysis of Lyapunov exponent and displacement bifurcation diagram, it is found that the period of the system varies with the amplitude of external disturbance force. Finally, the amplitude and frequency characteristics of the work roll bearing and the gap between the arch column and the lining plate are analyzed, and the influence of the liner clearance on the system vibration is analyzed. A method for suppressing the horizontal and vertical vibration of the work roll is proposed. The simulation and experimental results show that the method is effective.
【作者单位】：湖南科技大学机电工程学院;
【基金】：国家自然科学基金资助项目(51505142)
【分类号】：TG333
【正文快照】： 0引言热连轧机振动在轧制领域一直备受关注。随着市场的竞争及带钢产品消费结构的变化,带钢轧制生产有以热轧代替部分冷轧的发展趋势。在轧制薄规格、高强度带钢时,热连轧机呈现出复杂的多种现象并存的振动,表现为“幽灵”式振动[1]。生产实践表明,如需获得理想质量的产品,轧

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