锻压技术

轧机垂直振动特性研究及测试分析

英文标题：Research and test analysis on vertical vibration characteristics for rolling mill

作者：杨晋玲段牧忻

单位：中北大学西山教育中心

分类号：TP122

出版年,卷(期):页码：2021,46(7):229-236

摘要：

考虑到轧机扭振、垂直水平二向振动耦合效应，根据机械动力学理论，基于Kelvin-Vogit模型，运用牛顿第二定理，建立轧机扭转、垂直、水平耦合动力学模型，计算分析其固有频率和主阵型。构建高频周期激励，分析高频周期激励下轧机的动态响应。仿真结果表明，第5阶固有频率会引起轧机产生强烈自激振，影响轧机的工作稳定性。轧机系统的振动幅值与激励频率成正比例，使轧机系统出现高次谐波振动，当激励频率增加后，轧机系统的振动幅值随之下降，说明高激励频率和低激励振幅有利于轧机系统运行的稳定性。实验研究表明，实测与仿真得到的系统固有频率误差小于15%，验证了所建立的轧机耦合振动模型的准确性。研究结果对轧机设计时科学地确定（或选择）主要结构参数、在轧制生产中进一步规范轧制工艺规程、现场振动故障诊断等，有着重要的理论指导意义和实用价值。

Considering the coupling effect of torsional vibration and vertical and horizontal bidirectional vibrations for rolling mill, according to mechanical dynamics theory, based on Kelvin-Vogit model and using the Newton′s second theorem, the coupled dynamic model of torsional vibration, vertical vibration and horizontal vibration for rolling mill was established, and its natural frequency and main formation were calculated and analyzed. Then, the high frequency periodic excitation was constructed to analyze the dynamic response of the rolling mill under the high frequency periodic excitation. The simulation results show that the 5th order natural frequency causes strong self-excited vibration to affect the working stability for the rolling mill, and the vibration amplitude of the rolling mill system is proportional to the excitation frequency to make the rolling mill system appear high-order harmonic vibration. When the excitation frequency increases, the vibration amplitude of the rolling mill system decreases, indicating that the high excitation frequency and the low excitation amplitude are beneficial to the stability of the rolling mill system. The experimental results show that the natural frequency error of the system obtained by the actual measurement and simulation is less than 15%, which verifies the accuracy of the coupled vibration model for the rolling mill established. Thus, the research results have important theoretical guiding significance and practical value for scientifically determining (or selecting) the main structural parameters during the rolling mill design, further standardizing the rolling process regulations in the rolling production, diagnosing the on-site vibration fault and so on.

基金项目：

国家自然科学基金资助项目（61525108）

作者简介：杨晋玲（1992-），女，硕士研究生，E-mail：yangjl9212@126.com；通信作者：段牧忻（1969-），女，本科，高级工程师，E-mail：dwwqqq2021@126.com

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