Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system
ZHANG Yong-shun1,2, JIANG Wan-lu1, LI Zhen-bao1, LI Jing-jing1
1. Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：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.
张永顺, 姜万录, 李振宝, 李静静. 轧机液压压下系统非线性振动诱因分析[J]. 钢铁, 2020, 55(4): 106-112.
ZHANG Yong-shun, JIANG Wan-lu, LI Zhen-bao, LI Jing-jing. Inducement analysis of nonlinear vibration in rolling mill hydraulic screw down system. Iron and Steel, 2020, 55(4): 106-112.
[1] 张伟,王益群,高英杰.板带轧机液压压下系统的建模与仿真[J]. 液压与气动, 2004(1):21.(ZHANG Wei, WANG Yi-qun, GAO Ying-jie. Modeling and simulation of hydraulic screw-down system in a strip mill[J].Chinese Hydraulics and Pneumatics,2004 (1):21.) [2] 姜万录, 朱勇,郑直,等. 电液伺服系统非线性振动机理及试验研究[J]. 机械工程学报,2015, 51(4): 175.(JIANG Wan-lu, ZHU Yong, ZHENG Zhi,et al. Nonlinear vibration mechanism of electro-hydraulic servo system and its experimental verification[J].Journal of Mechanical Engineering, 2015, 51(4):175.) [3] 凌启辉,张维,赵前程,等. 轧机垂直系统动力学参数辨识[J]. 钢铁, 2019, 54(11): 123.(LING Qi-hui,ZHANG Wei,ZHAO Qian-cheng,et al. Dynamic parameter identification of rolling mill vertical system[J]. Iron and Steel, 2019, 54(11):123.) [4] 王林鸿,吴波,杜润生,等. 液压缸运动的非线性动态特征[J]. 机械工程学报, 2007,43(12):12. (WANG Lin-hong, WU Bo, DU Run-sheng, et al. Nonlinear dynamic characteristics of moving hydraulic cylinder[J].Chinese Journal of Mechanical Engineering,2007,43(12):12.) [5] 沈新玉,胡柯,李宏洲,等. UCM冷连轧机边降控制工作辊辊形优化[J]. 中国冶金, 2019, 29(11): 55. (SHEN Xin-yu,HU Ke,LI Hong-zhou,et al. Work roll contour optimization for edge drop control based on UCM cold rolling mills[J]. China Metallurgy, 2019, 29(11): 55.) [6] ZHU Yong, QIAN Peng-fei, TANG Sheng-nan, et al. Amplitude-frequency characteristics analysis for vertical vibration of hydraulic AGC system under nonlinear action[J]. AIP Advances, 2019, 9: (35):19. [7] 任新意,王松涛,高慧敏,等. 冷连轧机ESS辊型板形控制性能分析[J]. 钢铁, 2018, 53(3): 50. (REN Xin-yi,WANG Song-tao,GAO Hui-min,et al. Analysis on shape control performance of cold tandem mill with ESS roll profile[J]. Iron and Steel, 2018, 53(3): 50.) [8] 王少飞,屈子路,窦爱民,等. 多辊轧机在冷轧高强钢生产中的应用[J]. 中国冶金, 2019, 29(6): 81. (WANG Shao-fei,QU Zi-lu,DOU Ai-min,et al. Application of multi-roll mill in cold rolled high strength steel production[J]. China Metallurgy, 2019, 29(6): 81.) [9] 刘彬,潘贵翔,李鹏,等.液压缸非线性弹簧力下的轧机特性及控制[J]. 中国机械工程, 2018,29(24): 2925.(LIU Bin,PAN Gui-xiang, LI Peng, et al. Characteristics and control of rolling mills under nonlinear spring forces of hydraulic cylinders[J].China Mechanical Engineering, 2018, 29(24):2925.) [10] 汪净. 常规热连轧粗轧工作辊磨损分析与应用[J]. 中国冶金, 2018, 28(5): 54. (WANG Jing. Analysis and application of work roll wear of rough mill in hot strip mills[J]. China Metallurgy, 2018, 28(5): 54.) [11] 张瑞成, 马寅洲,高峥,等. 轧机液压压下垂直系统非线性振动机理研究[J]. 机械强度,2016,38(1): 6.(ZHANG Rui-cheng, MA Yin-zhou, GAO Zheng, et al. Study on the non-linear vibration in the hydraulic screw down vertical system for rolling mill[J].Journal of Mechanical Strength,2016, 38(1):6.) [12] 刘彬, 李鹏,刘飞,等. 液压缸非线性刚度约束系统的混沌预测及控制[J]. 中国机械工程,2017,28(5): 559.(LIU Bin, LI Peng, LIU Fei, et al. Chaotic prediction and control of hydraulic cylinder nonlinear stiffness constraint system[J].China Mechanical Engineering,2017, 28(5):559.) [13] 金晓宏, 李杰杰,刘文浩,等. 与输出变量相关的非线性三阶系统运动行为[J]. 科学技术与工程,2014,14(4): 55.(JIN Xiao-hong, LI Jie-jie, LIU Wen-hao, et al.Movement behavior of three order nonlinear system correlation with output variables[J].Science Technology and Engineering,2014,14(4):55.) [14] 李谋渭. 轧机振动研究的新进展[J]. 重型机械,1994 (6): 8.(LI Mou-wei. The new progress of study on rolling mill vibration[J].Heavy Machinery,1994 (6):8.) [15] 高亚南,彭艳,孙建亮,等. 1 580热连轧机F2精轧机振动综合测试与分析[J]. 钢铁,2013,48(1): 52.(GAO Ya-nan, PENG Yan, SUN Jian-liang, et al. Vibration comprehensive test and analysis on finisher 2 of 1 580 hot strip mill[J]. Iron and Steel,2013,48(1):52.) [16] Khan H, Seraphin C A, Sepehri N. Nonlinear observer-based fault detection technique for electro-hydraulic servo-positioning systems[J]. Mechatronics, 2005(15): 1040. [17] LIU J X,QIAO B J, ZHANG X W. Adaptive vibration control on electrohydraulic shaking table system with an expanded frequency range: Theory analysis and experimental study [J]. Mechanical Systems and Signal Processing, 2019, 132:125.
2020, Vol. 55 
