Mill Vertical-Torsion Coupling Dynamic Vibration Analysis Based on Experimental Study
基于实验研究的轧机垂扭耦合振动分析

According to multiple-degree-of-freedom (MDOF) system vibration theory, a modeling method of vertical-torsion coupling dynamic model is proposed in this paper, and differential equations describing the vertical-torsion coupling dynamic vibration were established for the 1780 hot-rolling mill R1 of Cheng De Iron & Steel Group CO., LTD. Corresponding system coupling coefficients were confirmed based on the field test measured data. Then, mill inherent frequency of the vertical vibration, the torsion vibration and the vertical-torsion coupling vibration was calculated respectively and compared. According to the inherent frequency variation in vertical-torsion coupling vibration, the first 15-order inherent frequencies were achieved. Through dynamic response analysis for the vertical-torsion coupled system during steel biting excitation, maximum vibration amplitude of the vertical vibration and the torsion vibration for upper and lower roller system were calculated respectively. By comparing the vibration amplitudes, interaction of torsion vibration and vertical vibration was demonstrated, and the theoretical analysis results were verified by field testing.