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以承钢1780热连轧机组的R1为研究对象,依据多自由度系统振动理论,提出了一种垂扭耦合动力学模型的建模方法,建立了R1的垂扭耦合振动微分方程;并结合现场实测数据,确定了系统的耦合系数;分别计算了该轧机垂振、扭振、垂扭耦合振动的固有频率,并进行了比较。分析了考虑耦合振动系统时,轧机固有频率的变化情况,给出了R1垂扭耦合振动的前15阶固有频率。通过对咬钢激励情况下垂扭耦合系统的动态响应分析,分别计算了上下辊系扭振与垂振的最大振幅。通过对振动幅值的比较,论证了扭振与垂振之间的影响程度,并通过现场实测对理论分析结果进行了验证。
Taking the R1 of 1780 hot strip mill in Chengsteel as research object, a modeling method of vertical-torsional coupled dynamic model was proposed based on multi-degree-of-freedom system vibration theory, and the vertical-torsional coupled vibration differential equation of R1 was established. The measured data were used to determine the coupling coefficient of the system. The natural frequencies of the coupled vibration of vertical, torsional, vertical and torsional vibration were calculated and compared. The variation of the natural frequency of the rolling mill considering the coupled vibration system is analyzed and the first 15 natural frequencies of the coupled vibration of vertical and torsional vibration are given. Through the analysis of the dynamic response of vertical and torsional coupling system under bite steel excitation, the maximum amplitude of torsional vibration and vertical vibration of upper and lower roller systems were calculated respectively. Through the comparison of vibration amplitude, the influence degree of torsional vibration and vertical vibration is demonstrated, and the result of theoretical analysis is verified by field measurement.