混合润滑状态下板带轧机垂直振动特性研究  

A study on vertical vibration characteristics of strip mill under mixed lubrication

作　　者：侯东晓 徐良 时培明[2] HOU Dongxiao;XU Liang;SHI Peiming(School of Control Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]东北大学秦皇岛分校控制工程学院,河北秦皇岛066004 [2]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《振动与冲击》2021年第24期243-248,304,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(61973262,51405068);河北省自然科学基金(E2019203146,E2020501013);中央高校基本业务费(N2023023)。

摘　　要：考虑轧制界面混合润滑状态的影响,基于卡尔曼力平衡理论建立了含润滑油膜厚度的动态轧制力模型。在此基础上,考虑板带轧机机械结构振动影响,建立了混合润滑状态下板带轧机的非线性垂直振动动力学模型;采用多尺度法对该振动模型进行求解,得到了系统的主共振幅频率方程。最后采用实际参数进行仿真,分析了三次刚度系数和外扰力幅值对系统主共振幅频特性的影响,得到了外扰力幅值和入口油膜厚度变化下的全局分岔图,发现外扰力和入口油膜厚度变化时会导致系统出现周期和混沌运动,同时发现轧机刚度系数对系统的运动行为影响很大,在合适的刚度下油膜厚度的变化将对系统振动行为不再敏感。Considering that the lubrication friction state in the rolling process is mixed lubrication,a dynamic rolling force model was established based on the Karman force balance theory.On this basis,a nonlinear dynamic model of strip rolling mill in vertical direction under the mixed lubrication was established according to the structure of the rolling mill.The vibration model was solved by using a multi-scale method,then the primary resonance amplitude-frequency equation of the system was obtained.Numerical simulations were carried out using actual parameters.The effects of nonlinear parameters and external disturbance force on the amplitude-frequency characteristics of the primary resonance were analyzed.Bifurcation diagrams with external disturbance force amplitude and inlet oil film thickness as variables were obtained.When the amplitude of the external disturbance force and the thickness of the inlet oil film change,the system appears a variety of movements such as periodic-double and chaotic,but the appropriate stiffness makes the system insensitive with the oil film thickness changing.

关 键 词：垂直振动 动态轧制力 混合润滑 主共振 分岔 

分 类 号：TH113.1[机械工程—机械设计及理论]