六辊冷连轧机电工钢矩形断面控制弯辊力模型

为满足新一代高技术冷连轧机宽幅电工钢薄板等高端板材“Dead flat”矩形断面超平材超高板形质量要求,采用显式动力学有限元法建立六辊冷连轧机一体化仿真模型,利用现场工业轧制试验数据验证有限元模型的准确性,定量分析电工钢完整轧制过程中不同轧制因素对有载辊缝凸度的影响规律;基于6辊UCM冷轧机板形控制机理和课题组自主设计的EDW-N(Edge Drop Control Work Rolls for Non-shifting of the Work Rolls)工作辊非窜辊辊形建立六辊冷连轧机电工钢矩形断面控制的弯辊力数学模型;由有限元仿真与现场工业轧制试验结果确定了六辊冷连轧机电工钢矩形断面控制弯辊力数学模型的参数,并验证了其准确性;某大型1 420 mm六辊冷连轧机生产应用现场连续检测反馈数据表明：取得电工钢高精度出口凸度均值C15≤7μm的比例从38.58%提高到67.74%的显著生产实绩,充分发挥了六辊冷连轧机的高精度板形控制能力,可在很大调节范围内对板形质量进行调控,为解决无工作窜辊的6辊UCM冷连轧机宽幅电工钢薄板矩形断面控制瓶颈难题提供了解决方案和实现路径。     

14辊轧机辊系变形的有限元分析

针对现场应用的14辊轧机,利用三维有限元软件MSC.MARC建立三维辊系弹性变形有限元模型,求解三维辊系复杂变形,分析第一中间辊抽动和中间辊凸度对承载辊缝的影响。研究得出第一中间辊抽动量在0-50mm时,带材边部厚度的调节范围;中间辊凸度与轧后板凸度呈线性关系,即中间辊凸度越大,辊系的横向刚度也越大。     

Preset model of bending force for 6-high reversing cold rolling mill based on genetic algorithm

The hydraulic roll-bending device was studied, which was widely used in modern cold rolling mills to regulate the strip flatness. The loaded roll gap crown mathematic model and the strip crown mathematic model of the reversing cold rolling process were established, and the deformation model of roll stack system of the 6-high 1 250 mm high crown (HC) reversing cold rolling mill was built by slit beam method. The simulation results show that, the quadratic component of strip crown decreases nearly linearly with the increase of the work roll bending force, when the shifting value of intermediate roll is determined by the rolling process. From the first pass to the fifth pass of reversing rolling process, the crown controllability of bending force is gradually weakened. Base on analyzing the relationship among the main factors associated with roll-bending force in reversing multi-pass rolling, such as strip width and rolling force, a preset mathematic model of bending force is developed by genetic algorithm. The simulation data demonstrate that the relative deviation of flatness criterions in each rolling pass is improved significantly and the mean relative deviation of all five passes is decreased from 25.1% to 1.7%. The model can keep good shape in multi-pass reversing cold rolling process with the high prediction accuracy and can be used to guide the production process.     

Multi-objective optimization of rolling schedule based on cost function for tandem cold mill

In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.     

Backup roll contour of a SmartCrown tandem cold rolling mill

SmartCrown was a new system developed by VAI for improving the strip profile and flatness control first applied in 1700mm tandem cold rolling mills at Wuhan Iron & Steel (Group) Corporation (WISCO). After tracing and testing, the application of the conventional crown backup roll matching the SmartCrown work roll of the production mill led to heavy and nonuniform wear, and the edge spalling of the backup roll often occurred. A 3-dimension finite element model of roll stacks was established, which was used to analyze the above-mentioned problems, and it was found that the main reason was the highly nonuniform contact pressure distribution between the work roll and the backup roll. A new FSR (flexible shape backup roll) was developed and applied in 1700mm tandem cold rolling mills. A lot of good actual effects of FSR, such as evident improvement in profile and flatness of strips,non-occurring edge spalling, wear uniform, and remarkable decrease in roll consumption were validated by long-term industrial applications.     

基于Fuzzy-PI方法的可逆式冷轧机液压压下系统的控制

针对可逆式冷轧机液压压下系统的特点，提出了基于Fuzzy-PI复合控制的方法，并进行了计算机仿真，取得了较好的控制效果。     

Improvement on strip flatness of cold temper mills by modifying roll contour shape

A study on roll gap profile (strip profile) control was accomplished in a 1700 mm single-stand temper mill. Some critical problems such as the deviation of work roll contour caused by grinding and wear, the effectiveness of work roll bending were discussed. Using a finite element model, the effects of roll contours (ground and wear) on strip profile were investigated. The roll bending effect on strip thickness was also analyzed. It is pointed out that there are some special features of flatness control in the temper mill: during temper rolling, roll deformation is slight due to small rolling load, and the loaded roll gap profile mainly depends on work roll contour, while the backup roll has a little effect on gap crown; the effect of bending force on gauge can not be ignored due to the coupling between flatness control and gauge control. A new roll contour arrangement adaptable to the mill was presented and has been put into practical production. The application of the new set of rolls showed some good results: larger crown control range of work roll bender, higher rolling stability, better strip profile and flatness quality.     

Compound control for speed and tension multivariable coupling system of reversible cold strip mill

To weaken the nonlinear coupling influence among the variables in the speed and tension system of reversible cold strip mill, a compound control (CC) strategy based on invariance principle was proposed...     

基于Lagrange乘数法悬臂施工连续梁桥线形最优控制

大跨径连续梁桥悬臂施工过程中各种误差的存在,使得实际结构的线形很难精确达到期望的数值.结合长珲一级公路在建的长新高架桥悬臂浇注的施工状况,对待建结构的几何线形最优控制问题进行了深入探讨,以优化控制理论的数学模型为基础,选择适当状态方程及量测方程,引入约束条件下的拉格朗日优化方法,通过求解目标函数在约束条件下的极值来实现对结构几何线形的最优控制.结果表明,该方法不仅计算简便、适用性强,而且具有较高的精度,为桥梁的安全施工和合理的成桥几何线形提供了有力的技术依据.     

弯辊和串辊对带钢板形影响

基于有限元软件ANSYS建立了冷轧六辊轧机的三维弹塑性有限元参数化模型。将轧机实体模型转换成有限元模型,根据轧机的工作方式提炼出边界条件和载荷条件,施加在有限元模型上。参数化模型采用ANSYS参数化设计语言APDL编写。通过修改程序中的参数,计算分析了弯辊力、中间辊的串辊量以及带钢宽度等参数对带钢形状和辊缝的影响。计算结果表明:当带钢宽度小于1 300 mm时,调整弯辊力对带钢板形的改变较为明显;当带钢宽度大于1 700 mm时,调整弯辊力对改变带钢板形的作用变得非常小,此时通过连续可变凸度轧辊（CVC）的串辊来调节板形更有效。该结论与冷轧厂实践结论一致。     

Algorithm design and application of novel GM-AGC based on mill stretch characteristic curve简

As the spring equation is limited to the accuracy of mill stiffness and the linearity of the mill spring curve, the traditional gaugemeter automatic gauge control （GM-AGC） system based on spring equation cannot meet the requirements of practical production. In allusion to this problem, a kind of novel GM-AGC system based on mill stretch characteristic curve was proposed. The error existing in calculating strip thickness by spring equation were analyzed first. And then the mill stretch characteristic curve which could effectively eliminate the influence of mill stiffness was described. The novel GM-AGC system has been applied successfully in a hot strip mill, the application results show that the thickness control precision is improved significantly, with the novel GM-AGC system, over 98.6% of the strip thickness deviation of 3.0 mm class can be controlled within the target tolerances of ±20 μm.     

球磨机模糊解耦控制系统的一种实现方法

中储式钢球磨煤机制粉系统是一个多变量,大惯性,大迟延,三输入三输出的强耦合系统。针对强耦合多变量特性,依据解耦补偿原理和模糊控制的思想,提出了一种新的解耦方法——利用模糊规则进行补偿解耦。介绍了将解耦补偿器的模型模糊化,由模糊规则实现的解耦算法,并由此设计了新型的磨煤机控制系统。对300 MW机组球磨机制粉系统的仿真结果表明:该方法具有较好的解耦能力,动态和静态特性,从而验证了利用模糊规则实现解耦是有效的。     

热轧机主传动系统疲劳设计负荷选取原则与方法

热轧机主传动系统咬钢时受到强大的冲击扭矩作用,每年的冲击次数达10^5～10^6次,因此应以咬钢时的冲击扭矩峰值载荷谱作为主传动系统的疲劳设计负荷。通过抽象简化,建立主传动系统的动力学模型并进行动力学仿真,计算出扭矩放大系数TAF。对于新设计的轧机,可按产品大纲通过理论公式计算出轧制各产品时的稳态轧制力矩;对于现有轧机,可以通过监测轧机主电动机的电流或功率来得到稳态轧制力矩载荷谱。将各稳态轧制力矩分别乘以扭矩放大系数TAF,就得到轧机咬钢时的冲击扭矩峰值载荷谱。采用累积损伤理论,再计及低于受力零件材料疲劳极限的循环应力对疲劳裂纹扩展的影响,按此进行疲劳设计,就能保证轧机主传动系统在预期寿命内安全工作。     

基于ICAP的步进传动控制系统的仿真研究

作为电气调速传动的主流——交流调速传动控制方式很多，交流步进传动是在运动控制的发展中形成的一个新的研究分支，它基于位置和速度输出的控制，是一种新型传动控制方式．依据变频器的结构及同步电动机的电路与状态方程，运用电路电子仿真软件包ICAP对步进传动系统进行了仿真研究，取得了良好的效果．     

Dynamic characteristics of cold rolling mill and strip based on flatness and thickness control in rolling process简

The dynamic model of cold rolling mill based on strip flatness and thickness integrated control was proposed,containing the following sub-models：the rolling process model,the dynamic model of rolls along axial direction,and the compensation model.Based on the rule of volume flow rate,the dynamic rolling process model was built.The work roll and backup roll were taken as elastic continuous bodies,the effect of shear and moment of inertia were taken into consideration,and then the dynamic model of rolls was built.The two models were coupled together,and the dynamic model of rolling mill was built.In the dynamic model,the thermal expansion of the rolls,the wear of the rolls and other related parameters can not be considered.In order to compensate the dynamic model,the coupled static model of rolls and strip was applied.Then,according to the inner relationship of these models,the dynamic model and the compensation model were coupled,and the dynamic model of rolling mill based on the strip flatness and thickness integrated control was built.The dynamic simulation of the rolling process was made,and the dynamic thickness and the dynamic flatness information were obtained.This model not only provides a theory basis for the virtual rolling,but also provides a platform for the application of advanced control theory.     

梅钢1420冷连轧机轧制力模型的开发及应用

梅钢1420轧制力模型在Hill方程基础上,分解提炼3个关键因子,建立了显函数的轧制力模型,并进行变形抗力参数和摩擦系数参数的自适应修正以提高轧制力模型精度．经生产实践数据检验,该模型自适应系数在0．9～1．1以内,满足模型在线控制要求．     

四辊轧机电液辊缝系统变刚度建模与控制研究

针对轧机压下缸行程变化带来的变刚度问题,借助轧制区动力学关系的引入,讨论了四辊轧机辊缝控制的机电液系统数学模型和控制要点。通过仿真与实测对比,验证了模型的有效性;以全工况下系统响应特性一致为目标,通过引入位移正反馈补偿,得到了改善大范围变刚度辊缝控制系统响应的方法;实测数据表明,所述方法能满足目标要求。最后简要讨论了用于提高板厚精度的自适应模型控制方法,并给出了实例。     

基于模糊神经元网络的阀控马达系统仿真

提出了一种基于模糊神经元网络的阀控马达控制方案．在系统中，将模糊控制技术与神经元网络技术相结合，构建了模糊神经元网络控制器．该控制器结合模糊控制与神经元网络各自的优点，既具有模糊控制器简单和有效的非线性控制作用，又具有神经元网络自学习和自适应能力，改善了控制系统的性能．     

基于MATLAB的模糊控制器控制规则优化研究

在模糊控制器中,只有合理有效地调整控制规则,才能充分发挥其效能,利用MATLAB提供的基于Windows平台的图形界面仿真工具SIMULINK,对带有自调整加权因子的模糊控制器控制规则进行单参数和多参数的仿真优化,通过参数标定和响应效果的比较,使模糊控制系统得到最快阶跃响应。优化结果表明,所采用的仿真方法具有方便、直观和准确等优点。