共查询到19条相似文献,搜索用时 109 毫秒
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为解决利用传统方法难以解决的轧钢过程控制,开发出基于BP神经网络的钢材轧制力预报系统软件.该预测程序是基于VC++6.0,Matlab和数据库混合编程技术基础上完成的,程序设计的核心是应用BP网络预报钢材的变形抗力,然后结合轧制力数学模型计算轧制力,最后提出了该系统在热轧生产中的在线应用方案. 相似文献
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为了进一步提高热连轧精轧机组轧制力的设定精度,采用小波神经网络建立轧制力预报模型。并采用改进的快速BP算法来训练网络。仿真结果表明:建立的轧制力预报模型的预报值与实际值之间的相对误差在±6%以内,且学习算法收敛速度快。 相似文献
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采里柯夫在对轧制变形区的卡尔曼微分方程处理时,用一条弦代弧得到平均单位压力数值。由于大压下量时弦比弧高很多,使轧件计算厚度增加,故用此平均单位压力不可能得到确切轧制力。用分段直线贴近圆弧的方法对单位轧制力分别进行计算,与采里柯夫、Sims等理论公式的计算值以及现场实测数据进行比较,该模型更为接近实际值。 相似文献
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基于平整机伸长率控制基本原理,针对目前伸长率控制模式下轧制力等预设定值不准确问题,提出采用BP神经网络控制技术,对平整机的轧制力设定、轧制力速度补偿以及平整机入出口张力设定进行优化。实际应用表明,基于BP神经网络的伸长率控制系统大大提高了伸长率控制的响应速度,有效减小了平整机过焊缝伸长率不符合带钢长度,从而提高了产品的成材率。 相似文献
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基于将轧制变形区划分为若干微单元的思想,对轧制变形区内轧制力影响因素变化规律进行研究,根据Von-Mises塑性变形方程,建立单位轧制压力的数学模型。经现场生产数据验证,轧制力计算偏差在10%以内,具有较高的计算精度和效率。 相似文献
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Three-Dimensional Model for Strip Hot Rolling 总被引:3,自引:0,他引:3
ZHANG Guo-min XIAO Hong WANG Chun-hua 《钢铁研究学报(英文版)》2006,13(1):23-26
Steel stripis widely usedin many fields such asautomobile ,building,transportation and householdappliance ,etc·. Withthei mprovement in productiv-ity and automation of strip processing,the require-ments for crown and flatness of strip have been in-creasingly severe ,and“crown free”steel strips arerequired for some special applications such as for au-tomobile parts andtinplate cans .In order toi mprovethe strip quality , an effective three-di mensionalmodel is needful to further study on the… 相似文献
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To improve the accuracy and speed of finite element calculation,a new friction model was proposed,in which a layer of thin friction element between the roller and workpiece was introduced to consider the contact friction.This model was used in the three-dimensional elastic-plastic finite element model of strip rolling process.Taking the geometrical size and physical characteristics of intermediate medium between roller and workpiece into consideration,the stiffness of the friction element was corrected by two factors,i.e.,the thickness of friction element and β factor.Without any assumption about the value and direction of friction force and neutral point position,the rolling process was simulated by using this model.The results obtained by this model were compared with the experimental results and the feasibility of the model was verified. 相似文献
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To reveal the basic deformation mechanisms under the conditions of high friction, small reduction, and long contact length in thin strip temper rolling process, an elastoplastic finite element analysis of plane strain upsetting was made based on the FEM software Marc. The results indicated that a near flat ‘zero reduction’ region was present in the center of the contact arc. The simulation results about the effect of rolling parameters on the central flat region showed that any change of increasing the rolling force could result in or enlarge the central flat region in the deformation zone. Stress distribution results illustrated that the metal was in triaxial compression state. Although the maximum and minimum principal stresses were all much larger than the yield stress of the strip, the equivalent stress became lower than that, and no further plastic strain, even a small elastic spring back occurred in the central flat region. That was the problem of ‘hydrostatic pressure’ in thin strip temper rolling. 相似文献