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通过改进普通的快速傅立叶变换的计算方法,使快速傅立叶变换更适于实际分析影响热带带钢工的轧辊偏心。计算结果表明该方法计算的频谱泄漏少,主要分量幅值增大,计算精度大幅提高。 相似文献
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针对轧机普遍存在的轧辊偏心问题,结合偏心信号的特点及补偿控制方法,将一种在工业机器人重复性控制领域广泛使用的迭代学习控制方法应用在轧辊偏心补偿控制中。基于对周期误差数据不断学习,轧机偏心控制系统的压下控制调整更加精准。对构造的轧辊偏心信号进行测试,其相比于快速傅里叶变换补偿方法,迭代学习10~50次后的补偿精度提高20.1%~56.4%;经过迭代学习律参数的优化,迭代学习后补偿精度达到50%以上的同时,收敛速度大幅增加。考虑到在轧机加减速状态时偏心信号频率发生改变,通过迭代学习控制对变频信号进行补偿,经过10次的快速学习补偿,误差评价函数值达到最初的13.6%。利用冷连轧一道次的生产线实际数据进行测试,结果表明迭代学习补偿控制能够在学习过后有效提升偏心补偿精度。研究基于迭代学习控制方法,为轧辊偏心的补偿控制提供一定的参考。 相似文献
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介绍一种新研制开发的轧辊偏心补偿控制器。该控制器采用TMS320C25—D型开发/高速处理板的扩展板.配制数据采集和输出电路.可以完成信号采集与处理.然后以电压形式输出补偿偏心的信号。加到液压系统。 相似文献
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AGC系统中的轧辊偏心问题 总被引:9,自引:1,他引:8
本文介绍本钢热连轧厂引进的AGC系统中抑制轧辊偏心扰动的一种有效方法──轧制力偏心滤波器,分析了轧制力偏心滤波器的特点及其控制算法的优越性,并给出实际的滤波效果 相似文献
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通过对带钢平整过程中工作辊和支撑辊受力、变形等特点的分析,优化了轧辊辊型。生产实践表明,优化辊型提高了可应用的轧制力,增大了平整机的稳定性和消除带钢板形不良的能力,使因板形不良导致的废次品量下降。 相似文献
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Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis; however, the wavelet method had a frequency aliasing problem owing to the less than ideal cut off frequency characteristics of wavelets. This made its component reconstruction of an inaccurate signal. To eliminate inherent frequency aliases in the wavelet transform, fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) were combined with the Mallat algorithm. This synthesis was described in detail. Then, the roll eccentricity component was extracted from rolling force signal. An automatic gauge control (AGC) system added with a multi resolution wavelet analyzer was designed. Experimental results showed that the anti aliasing method could greatly restrain the inverse effect of eccentricity and the thickness control accuracy was improved from ±40 μm to ±15 μm. 相似文献
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Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis; however, the wavelet method had a frequency-aliasing problem owing to the less than ideal cut-off frequency characteristics of wavelets. This made its component reconstruction of an inaccurate signal. To eliminate inherent frequency aliases in the wavelet transform, fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) were combined with the Mallat algorithm. This synthesis was described in detail. Then, the roll eccentricity component was extracted from rolling force signal. An automatic gauge control (AGC) system added with a multi-resolution wavelet analyzer was designed. Experimental results showed that the anti-aliasing method could greatly restrain the inverse effect of eccentricity and the thickness control accuracy was im-proved from ±40 μm to ±15 μm. 相似文献
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分析了热带钢连轧的轧制条件,据此提出各机架轧辊应具备的主要性能,综述了热带钢连轧机用各类轧辊材质的技术特性,并以宝钢,武钢三套热带钢连轧机为例提出了其用辊方向。 相似文献
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