摘要
针对轧制薄规格高强度带钢时引起轧机运行不稳的问题,基于传动系统受到轧制力矩和电磁力矩的共同作用,建立双源作用下的传动系统两自由度等效非线性动力学模型,通过平均法求解得出幅值、相位及非线性阻尼和刚度参数之间的函数关系.引入Morlet复小波变换理论,利用模极大值法提取小波脊线,对工业现场测试所得咬钢冲击信号进行非线性刚度和阻尼参数辨识,仿真结果表明两者拟合误差为2.5%;将辨识参数与实际参数用于双源扰动的非线性动力学研究,理论研究表明可以通过增加阻尼一次、三次项和减小刚度三次项等参数来抑制振动的强度.
When rolling the high-strength thin steel strip,the running instability of the rolling mill actually exists. Therefore,based on both the rolling torque and electromagnetic torque applied to the main drive system at the same time,one two-degreefreedom equivalent nonlinear dynamic model of transmission system subjected to rolling and impacting under double power,is correspondingly established. The function relationship among the amplitude, phase, nonlinear clamping and stiffness parame-ters are obtained by the averaging method. The Morlet complex wavelet transform theory and the modulus maxima method are respectively introduced and applied to excavate the wavelet ridge line. Hence, the nonlinear stiffness and clamping parameters are identified using the rolling ancl impacting signal obtained from the industrial test. The simulation results suggest 2.5% fit-ting error. Eventually, combined with the real parameters,the recognized stiffness ancl damping parameters are applied to the nonlinear dynamic study on the system under dual source disturbance, and the theoretical study indicates that the vibration is effectively reduced by increase the item ancl cubic damping, decrease the cubic stiffness and initial load parameters.
作者
吴继民
张义方
朱小龙
闫晓强
WU Ji-min;ZHANG Yi-fang;ZHU Xiao-long;YAN Xiao-qiang(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Mechanical Engineering,Anhui University of Technology,Maanshan 243002,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2019年第4期581-589,共9页
Journal of Vibration Engineering
关键词
轧机振动
非线性动力学特性
参数辨识
双源作用
小波变换
roll mill vibration
nonlinear dynamics characteristics
parameter identification
double power application
wavelet transform
