| Roll Eccentricity Compensation Based on AntiAliasing Wavelet Analysis Method |
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| 引用本文： | CHEN Zhiming,LUO Fei,XU Yuge,YU Wei. Roll Eccentricity Compensation Based on AntiAliasing Wavelet Analysis Method[J]. 钢铁研究学报(英文版), 2009, 16(2): 35-0. DOI: 10.1016/S1006-706X(09)60024-8 |
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| 作者姓名： | CHEN Zhiming LUO Fei XU Yuge YU Wei |
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| 作者单位： | College of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, ;Guangdong, China |
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| 基金项目： | Item Sponsored by National Natural Science Foundation of China （60774032）; Provincial Natural Science Foundation of Guangdong Province of China （06025724） ; Key Project of Guangzhou Scientific Program of China （2007Z2-D0121）; Special Research Fund of Ministry of Education of China for College Doctoral Subjects （20070561006） |
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| 摘 要： | 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.
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| 关 键 词： | 小波分析方法 轧辊偏心 偏心补偿 Mallat算法 小波变换算法 快速傅立叶变换 快速傅里叶变换 锯齿 |
| 收稿时间： | 1900-01-01; |
Roll Eccentricity Compensation Based on Anti-Aliasing Wavelet Analysis Method |
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| CHEN,Zhi-ming LUO,Fei XU,Yu-ge YU,Wei. Roll Eccentricity Compensation Based on Anti-Aliasing Wavelet Analysis Method[J]. Journal of Iron and Steel Research, 2009, 16(2): 35-0. DOI: 10.1016/S1006-706X(09)60024-8 |
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| Authors: | CHEN Zhi-ming LUO Fei XU Yu-ge YU Wei |
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| Affiliation: | College of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China |
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| Abstract: | 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. |
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| Keywords: | hot strip rolling roll eccentricity compensation wavelet analysis frequency alias |
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