基于N4SID子空间辨识的轧机系统性能改进分析

利用N4SID子空间辨识方法对南钢2800 mm中厚板精轧机系统的性能进行了分析。选取轧机的测量信号构成辨识对，利用子空间辨识方法，得到轧机在工作时的高阶动态数学模型。机架在0.63 Hz处有一振动频率，当轧辊旋转频率与该频率一致或接近时容易激发机架振动，对板形和设备正常运转影响较大。实际生产中，精轧机应避免在上述振动频率对应的转速范围36.0~39.0 r&;#8226;min-1内进行轧制，速度调整后板形得到很好控制，表明模型在轧机系统性能改进分析中是有效的。

Performance improvement analysis of a rolling mill based on N4SID subspace identification method

The stability of roll system was identified on the 2800 mm heavy plate finishing rolling mill in Najing Steel Company using the Subspace Identification Approach N4SID. High order dynamic mathematical model for working mill was constructed by signal choice and identification pair construction. When the rotation frequency of roll is about 0.63 Hz, a mode of vibration will exist in the mill, vibration of the mill stands will be induced and the plate shape and normal function of equipments will be influenced. In practical production, the rotation rate range 36.0~39.0 r•min-1 for the finishing rolling mill must be avoided and the plate shape was controlled after speed adjustment. The valid of this model in the analysis on the stability of roll system was verified by which.