共查询到18条相似文献,搜索用时 78 毫秒
1.
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
2.
3.
本文介绍液压自动厚度控制(AGC)技术在厚板轧机上的应用和取得的成果并阐述AGC系统的分类及功功能以及压力型液压AGC技术的基本原理。 相似文献
4.
新的液压AGC技术在1200WS四辊可逆冷轧机上的应用 总被引:5,自引:0,他引:5
新的液压AGC技术成功地应用在1200WS四辊可逆冷轧机上,取得了较好的控制效果,0.5~1.5mm带材的最终厚度公差小于带材厚度的±1%。本文介绍了该液压AGC系统的组成及功能,论述了几种AGC的控制模型和特点以及新技术在AGC中的应用,对AGC应用中的有关问题进行了讨论。 相似文献
5.
6.
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
7.
本文简介了首钢中厚板轧钢厂3340mm四辊精轧机压下系统液压AGC改造的总体方案、系统设计的功能和特点,主要硬件的选取和参数,以及AGC系统的各种补偿,并着重讨论了本次改造采用的AGC系统工作方式,轧制过程数学模型和改造后的使用效果。 相似文献
8.
9.
AGC系统控制模型与结构的研究 总被引:11,自引:3,他引:8
针对几种厚度自动控制系统(AGC系统)控制模型的特点,分析,研究了各种AGC控制模型对系统结构的特殊要求,并给出基本的系统结构。对各种AGC控制模型及系统之间的关系做了推导和比较。 相似文献
10.
具有偏心补偿功能的P-AGC系统 总被引:3,自引:0,他引:3
本文论述了一种具有轧辊偏心补偿功能的压力AGC(P-AGC)系统。它借助于自适应数字陷波滤波器提取偏心信号,消除偏心影响。计算机仿真结果表明,该系统控制精度比传统P-AGc系统的控制精度提高了60%以上。 相似文献
11.
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
12.
13.
本文论述了一种用于冷轧机的新型厚度自动控制系统。它采用预报与估计的方法,既可以避免直接测厚仪所造成的时间延迟,又可以消除内支持辊偏心而引起的厚度计式厚度自动控制系统控制质量的恶化。 相似文献
14.
15.
16.
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
17.
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