基于阶比跟踪的带钢冷轧过程轧辊偏心信号分析  

Analysis of Roll Eccentricity Signal in Strip Cold Rolling Process Based on Order Tracking

作　　者：刘涛[1,2] 崔会宝 陈刚[1,2] 

机构地区：[1]燕山大学河北省重型机械流体动力传输与控制重点实验室,秦皇岛066004 [2]先进锻压成形技术与科学教育部重点实验室(燕山大学),秦皇岛066004

出　　处：《机械工程学报》2015年第6期104-108,共5页Journal of Mechanical Engineering

摘　　要：针对板带轧制厚度控制过程中轧辊偏心扰动难以在线测量和准确表达问题,提出新的系统解决方法。根据板带轧制原理,建立轧辊偏心在线软测量模型,通过采集得到的压下缸位移、轧制力、出口板厚等数据对轧制过程中的轧辊偏心信号进行计算,从而解决轧辊偏心难以在线测量的问题。为解决轧制过程速度变化带来的偏心信号频率和周期的变化问题,在轧辊偏心分析中,引入阶比跟踪技术计算角域等角度采样时标,通过拉格朗日插值计算实现角域重采样,把轧制过程数据的时间序列转化为轧辊转动等角度采样的角域序列。同时,通过厚度信号的角域平移,解决由板厚信号滞后带来的数据不匹配问题。利用小波滤波、相干时间平均法实现依据带钢冷轧过程数据进行轧辊角域偏心波形的分析和提取,为实现轧辊偏心的有效补偿打下基础。Aim at the problem of roll eccentricity in measuring on line and presenting accuracy, an new effective solution isprovided. According to the theory of plate and strip rolling, the roll eccentricity online soft measurement model is established, through the collected pressing cylinder displacement, rolling force, export plate thickness data during the rolling process, the roll eccentricity can be estimated. In order to solve the roll eccentricity signal frequency and cycle diversification when the rolling speed changes, the order tracking technique is applied, the time marks of same angle sampling are calculated, and the values of resample in angle domain are calculated by Lagrange interpolation method. The time sequence of rolling process data is translated into angle domain sequence. And the mismatching of data due to the lag of thickness signal is solved by moving in angle domain. The signal of roll eccentricity is analysis and extracted by wavelet filtering and coherence time average method, which is the basement work to compensate the roll eccentricityeffectively.

关 键 词：阶比分析 轧辊偏心 冷带轧机 相干平均 

分 类 号：TG331[金属学及工艺—金属压力加工]