轧机液压压下系统非线性振动诱因分析  

Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system

作　　者：张永顺 姜万录[1] 李振宝 李静静 ZHANG Yong-shun;JIANG Wan-lu;LI Zhen-bao;LI Jing-jing(Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control,Yanshan University,Qinhuangdao 066004,Hebei,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学河北省重型机械流体动力传输与控制重点实验室,河北秦皇岛066004 [2]国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《钢铁》2020年第4期106-112,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51875498,51475405);河北省自然科学基金重点项目资助项目(E2018203339);燕山大学基础研究专项课题青年课题资助项目(15LGB005)。

摘　　要：具有液压压下系统的轧机被广泛应用在板带生产过程中,为解决液压压下系统引起的轧机非线性振动问题,在闭环控制情况下分别研究了不同阻尼系数、泄漏系数以及控制器比例系数3种系统参数对压下系统垂振的影响。考虑压下缸非线性液压弹簧力建立了轧机液压压下系统垂振模型,通过振动位移时域图和位移-速度相图分析了不同系统参数与系统垂振的相关性。仿真结果表明,由于轧机液压压下系统采用传统PID控制器,液压系统本身阻尼系数、泄漏系数等具有慢时变特性,会使得原有PID控制可能出现功能失效情况,造成系统垂振的发生,该研究为后续设计控制器消除液压系统参数变动引起的垂振有一定的理论和工程实际意义。The rolling mill with the hydraulic screw-down system is widely used in the strip production process,in order to solve the nonlinear vibration problem of rolling mill hydraulic screw-down system,the influence of three system parameters which are different damping coefficients,leakage coefficients and controller proportional coefficients on vertical vibration of the hydraulic screw-down system is studied under closed-loop control.Firstly,a vertical vibration model of the hydraulic screw-down system for the rolling mill is established considering the nonlinear spring force of the press cylinder.Secondly,the correlation between different system parameters and vertical vibration is analyzed by a vibration displacement-time diagram and a displacement-velocity phase diagram.Simulation results show that due to the hydraulic screw-down system of rolling mill adopts the traditional PID controller,the damping coefficient and leakage coefficient of the hydraulic system have slow time-varying characteristics,which may lead to the failure of the original PID control and cause vertical vibration of the system eventually.This research has a certain theoretical and practical engineering significance for the subsequent design of controllers to eliminate the vertical vibration caused by the fluctuation of hydraulic system parameters.

关 键 词：液压压下系统 非线性弹簧力 垂振 非线性振动模型 

分 类 号：TG333[金属学及工艺—金属压力加工]