双动力源作用下热连轧机工作辊非线性水平振动特性研究  

Nonlinear horizontal vibration characteristics of working rolls of a hot rolling mill with dual power source

作　　者：凌启辉[1] 闫晓强[1] 张清东[1] 张义方[1,2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]马鞍山钢铁股份有限公司,安徽马鞍山243003

出　　处：《振动与冲击》2014年第12期133-137,175,共6页Journal of Vibration and Shock

摘　　要：建立双动力源作用的热连轧机工作辊非线性水平振动动力学模型,利用平均法求解系统主共振解析解近似表达式。以某厂热连轧机组为例,分析带钢刚度线性项、非线性二次项、阻尼线性项及双动力源总激励幅值对系统主共振幅频响应曲线影响。依据水平振动微分方程求解主传动系统扭振、压下系统垂振共同作用下的响应;以加速度有效值描述振动强弱,对比分析获得垂振对水平振动贡献量大于扭振贡献量;改变扭振、垂振两激励间相位角,两者相位约180°时水平振动最小,此可为抑制轧机水平振动提供理论依据。A nonlinear horizontal vibration dynamic model was built for a top working roll of a hot rolling mill,with dual power source.The averaging method was used to solve the analytical solution approximate expression of the primary resonance of the system.Taking a hot strip mill for example,the effects of linear terms of strip steel stiffness,its nonlinear quadratic terms,linear terms of damping and total excitation amplitude of dual power source on the amplitude-frequency response curve of the system primary resonance were analyzed.The system response was solved with its horizontal vibration differential equations under the combined action of the main drive system＇s torsional vibration and the hydraulic screwdown system＇s vertical vibration.The intensity of the system response was described with RMS of its acceleration.It was shown that the contribution of the vertical vibration hydraulic screwdown system to the horizontal vibration of the system is larger than that of the torsional vibration of the main drive system; the horizontal vibration of the system is the minimum when the phase angle between torsional vibration excitation and vertical vibration one is 180°.The results provided a theoretical basis for suppressing the mill horizontal vibration response.

关 键 词：热连轧机 双动力源 非线性 水平振动 频响特性 

分 类 号：TH113.1[机械工程—机械设计及理论]