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根据偏心补偿的要求,利用零相位数字滤波器实现对轧制力信号中偏心信号的提取,并将其反馈到控制系统,达到偏心补偿的目的.仿真结果表明,得到了较好的补偿结果,对实际应用有一定的启发作用. 相似文献
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文章分析了X-H轧制方法轧件偏心的产生原因,通过轧制线和偏心调整,减小轧制工装精度误差,优化轧边机轧槽深度等措施,可以有效地控制偏心。 相似文献
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针对天钢中厚板精轧机轧制过程中厚度控制系统产生的轧辊偏心问题,对其进行系统的分析。根据轧辊偏心高频周期波的特点及其与辊缝、轧制力、带钢厚度的关系,采用傅里叶级数分析算法对其进行补偿,将其应用于天钢中厚板的厚度控制系统中,很好地避免了AGC系统的误操作,提高了板材出口厚度的精度以及产品的质量。 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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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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可逆冷带轧机偏心的影响与检测 总被引:1,自引:0,他引:1
讨论了冷带轧机中轧辊偏心的起因 ,深入分析了偏心对带材厚度的影响 ,提出了一种将轧辊等效 ,然后作N次等分的轧辊偏心检测方法 ,并应用最小二乘方法计算轧辊偏心量的大小。 相似文献
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针对傅里叶变换、小波算法等传统信号处理方法在非线性信号的提取与重构中存在的缺陷,提出了基于聚合经验模态分解的轧辊偏心信号提取新方法。另外,针对传统自动厚度控制系统(AGC)在偏心补偿控制中的不足,设计了有偏心补偿环节的 AGC系统。新方法将轧制力信号分解为多个不同特征模态函数,从中提取表征偏心信号的特征模态函数,并用此重构偏心信号,最后将新方法重构的偏心信号投入到此系统中控制轧件厚度。仿真及实验结果表明,利用聚合经验模态分解方法重构得到的轧辊偏心模型可以很大程度减小厚度波动,补偿效果优于小波算法。 相似文献
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三辊轧制荒管壁厚偏心控制是无缝钢管壁厚精度控制的重要环节。基于生产试验分析了荒管壁厚偏心的特征,运用解析方法建立了三辊轧制荒管壁厚偏心的理论计算模型,针对实际生产条件进行了预报计算与比较,分析了三辊轧管工艺因素对荒管壁厚偏心的影响特点,并进一步讨论了改善荒管壁厚偏心的方法。研究结果表明,荒管壁厚偏心的基本特征表现为“偏心螺旋型”,在荒管壁厚不均中的占比达80%以上;毛管壁厚偏心和温度偏心是影响三辊轧制荒管壁厚偏心的最重要因素;增大三辊轧制减壁量、降低毛管温度、提高轧辊台肩高度、增大轧辊转速有利于减小荒管壁厚偏心。 相似文献