Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (7): 62-67.doi: 10.3969/j.issn.1000-565X.2014.07.010

• Mechanical Engineering • Previous Articles     Next Articles

Investigation into Induction of Nonlinear Coupling Vibration of Main Drive System of Rolling Mill by Harmonics of Variable Frequency

Zhang Yi-fang Yan Xiao-qiang Ling Qi-hui   

  1. School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2013-12-04 Revised:2014-04-23 Online:2014-07-25 Published:2014-06-01
  • Contact: 闫晓强(1961-)，男，教授，博士生导师，主要从事轧机耦合振动监测及抑振控制研究． E-mail:yxqzhw@263.net
  • About author:张义方(1980-)，男，博士生，主要从事轧机机电耦合动力学研究．E-mail:zhangyifang2008@126．com
  • Supported by:

    国家自然科学基金钢铁联合基金资助项目( 51174248 ) ; 吉林省科技发展计划工业高新技术重点项目( 20080324)

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Abstract:

When the torsional vibration of the drive shaft of rolling mill is monitored on-line by means of the torquetelemetry system,the signal features show that the electromechanical coupling vibration occurs in the main drivesystem.In order to reveal its mechanism,the harmonic components with fundamental wave in the cycloconverteroutput current and the corresponding harmonic torque are obtained by a Matlab /Simulink simulation,the characteristicsof drive mechanical structure are analyzed by means of ANSYS.Then,an equivalent kinetic model of drive mechanicalstructure with nonlinear stiffness and damping term is built,and the coupling mechanism and characteristicof harmonic excitation and mill structure are revealed. Simulation results indicate that both reducing harmonicamplitude and increasing damping can decrease vibration energy to a large extent.

Key words: cycloconverters, harmonic, coupling, rolling mill, vibration