连续热镀锌线气刀吹锌过程中锌波纹产生的大涡模拟

为寻求连续热镀锌线气刀吹锌过程中带钢上出现锌波纹的原因,采用大涡模拟（Large Eddy Simulation,LES）方法数值求解三维非稳态气刀射流湍流流场,并结合带钢表面的镀锌层厚度的零维预测模型研究锌波纹产生的机理．结果表明,在气刀射流冲击区域两侧有交替成对出现的漩涡,造成带钢表面的压强和切应力周期性波动分布,从而产生锌波纹．     

基于核偏最小二乘的锌层重量预测模型

为了给带钢热镀锌生产的质量控制提供必要的决策支持和分析手段,针对气刀对锌层重量的控制工艺,提出了基于核偏最小二乘回归的锌层重量预测模型。利用核函数将低维空间的非线性回归转化为高维空间的线性回归,克服了实际生产工艺中非线性因素对预测模型的不利影响。应用鞍山钢铁集团公司带钢热镀锌的生产实际数据进行验证,结果表明,基于核偏最小二乘的锌层重量预测方法与线性偏最小二乘、BP神经网络等方法相比,具有更好的预测精度。     

钢板表面质量机器视觉检测系统设计

针对国内钢厂采用人工方法检查钢板表面缺陷存在可靠性差的问题,开发设计了基于机器视觉技术的带钢表面缺陷自动检测系统.系统通过摄像头采集带钢表面的图像,然后采用图像处理及模式识别算法对图像进行实时处理和分析,从而检测出钢扳表面缺陷,并对缺陷进行自动分类识别.实验结果表明,系统能够对带钢表面进行实时在线监测,并能正确识别常见的带钢表面缺陷.     

烧结烟气氨法脱硫塔气液两相流数值模拟

为研究脱硫塔内的气液分布情况对脱硫效率的影响,选用FLUENT作为计算工具,以烧结烟气氨法脱硫塔作为研究对象,对塔内气相湍流采用Euler方法描述,对喷淋液滴采用Lagrange颗粒轨道模型描述,研究烟气入口倾角和入口距离浆液池液面高度对脱硫塔内气液两相流场分布的影响,并对脱硫塔的关键参数取值给出建议.     

基于局部信息熵迭代的带钢表面缺陷分割

在带钢产品的生产过程中,表面缺陷检测是其质量控制的重要环节之一。由于流水线以高速运行造成了钢板表面的震动,钢板材质可能引起光线不规律的反射,以及光照在钢板表面上分布的不均匀性,使获取的带钢图像呈现中间偏亮四周偏暗的成像效果。本文针对带钢表面图像灰度分布的特性,结合边缘点投影和信息熵迭代阈值选取,提出了基于局部信息熵迭代的带钢表面缺陷分割。试验结果表明,该方法能具有较好的分割效果。     

递推最小二乘法辨识连续带钢热镀锌退火炉模型参数

提出了用递推最小二乘法辨识连续带钢热镀锌退火炉模型参数.在已建立的连续带钢热镀锌退火炉数学模型的基础上,经过分析计算确定模型参数.考虑到最小二乘法的缺陷,选用递推最小二乘法进行参数辨识,并结合实例给出辨识结果和分析,证明了该方法的可行性.     

镀锌生产中锌合金镀层铁含量的在线检测

介绍了镀锌生产中锌合金镀层铁含量的在线检测方法和系统结构,镀锌检测仪可以有选择性地在线测量镀层中铁含量和锌层重量,并达到很高精度.另外,还介绍了热镀锌生产线合金化炉工艺控制系统,使用该合金化工艺控制器能够实现带钢镀层沿长度和宽度方向上的特性均匀一致和最高可再现性.     

连续热镀锌退火炉设备配置和特点

随着我国工业生产水平的不断提高,钢板热镀锌工艺的要求也越来越高。简要叙述了连续热镀锌工艺及其影响因素,介绍了连续热镀锌退火炉的设备配置和特点,以期能够更好地促进连续热镀锌工艺的发展,提高产品质量。     

带钢表面缺陷在线检测系统的设计与实现

带钢表面质量的优劣将直接影响到最终产品的性能和质量。本文研究了一种基于图像处理和模式识别的带钢表面缺陷检测系统,它采用了特殊的软件设计结构和模块化设计的理念,实验表明该软件对钢板表面进行在线式缺陷实时检出,具有较高精度,而且系统对缺陷数据管理并提供报表及打印功能。     

基于BP神经网络的冷轧带钢表面缺陷分类研究

冷轧带钢表面检测系统作为带钢表面质量的检测设备,在钢铁生产中具有重大的应用价值.本文首先从冷轧带钢表面缺陷检测系统的总体结构以及神经网络在冷轧带钢表面检测系统中的应用两个方面介绍冷轧带钢表面缺陷检测系统.然后采用BP神经网络对在线冷轧带铜表面缺陷进行检测分类,结果表明检测系统总识别率达到了96%.     

带钢连续热镀锌退火过程的模型化

针对大型冷轧带钢连续热镀锌退火过程的模型化和控制难题，本文以目前国内最先进的宝钢热镀锌生产线为对象，建立了用于实进控制的两类新疑数学模型，带温分布模型和带温跟踪模型，仿真和工业运行效果良好。     

带钢磁悬浮防抖系统的研究

在镀锌生产线中垂直带钢水平晃动会造成镀层不均。基于磁悬浮技术能够实现无接触稳定的特点,研制了用于带钢防抖的磁悬浮系统。分析建立了系统的数学模型,设计了PID控制器。研究设计了包括传感器、控制器、功率放大器的磁悬浮电控系统。在模拟试验台上对系统的性能进行了试验研究。通过试验证明了该磁悬浮系统能够稳定地悬浮带钢,减小带钢在外力扰动下的振幅和回到稳态所需的调节时间,并且在激振试验中成功地使带钢的振幅减小了71.4%。     

Sensitivity of turbulent Schmidt number and turbulence model to simulations of jets in crossflow

Environmental discharges have been traditionally designed by means of cost-intensive and time-consuming experimental studies. Some extensively validated models based on an integral approach have been often employed for water quality problems, as recommended by USEPA (i.e.: CORMIX). In this study, FLOW-3D is employed for a full 3D RANS modelling of two turbulent jet-to-crossflow cases, including free surface jet impingement. Results are compared to both physical modelling and CORMIX to better assess model performance. Turbulence measurements have been collected for a better understanding of turbulent diffusion's parameter sensitivity. Although both studied models are generally able to reproduce jet trajectory, jet separation downstream of the impingement has been reproduced only by RANS modelling. Additionally, concentrations are better reproduced by FLOW-3D when the proper turbulent Schmidt number is used. This study provides a recommendation on the selection of the turbulence model and the turbulent Schmidt number for future outfall structures design studies.     

连续热镀锌退火炉控制系统的设计与实现

针对大型冷轧带钢连续热镀锌退火过程模型化及控制这一技术难题，本文以某实际系统为背景，提出了一种具体的设计与实现方案。本系统的研制成功地填补了国内空白，具有显著的经济效益和社会效益，对于其它类似的大型引进项目的技术消化和技术改造也有一定的参考价值。     

Comparison of models created for the prediction of the mechanical properties of galvanized steel coils

The mechanical properties of steel coils can be predicted prior to the galvanizing process, thereby preventing the production of galvanized steel coils that are not suitable for the customer’s purpose. At the same time, this will reduce the waste of zinc and unfriendly effects on the environment. The purpose of this paper is to present a comparative assessment of the different techniques currently being used to estimate the mechanical properties of steel coils before being processed on the hot dip galvanizing line (HDGL). The authors have evaluated the models established by linear and non-linear, bagging and other more aggregated construction techniques. Using a total of 30 models, predictions were made for each parameter in order to obtain valuable information about the capabilities of these models and techniques. Each model was tested against each data set ten times. Also, models were constructed to determine the relevance of steel grade to the accuracy of the models’ predictions by excluding from the models any consideration of steel grade. As a result of our tests of these models, it is possible to recommend the model to choose for each parameter.     

基于PCTSP的热轧单元计划模型与算法

根据钢铁企业热轧产品生产工艺约束条件,将热轧生产轧制单元计划模型归结为奖金收集旅行商问题,设计了蚁群最优化算法对模型进行求解.引用某钢铁企业热轧生产轧制单元计划编制的实际问题对模型和算法进行了验证,并与遗传算法的求解结果进行了对比.实验结果表明模型和算法的优化效果和时间效率都是令人满意的.该模型和算法经过改进后可应用到包含多个轧制单元计划的轧制批量计划优化问题中.     

基于MFC的雨滴水纹动画模拟

基于MFC的框架结构仿真实现雨滴三维水纹动画效果。提出利用MFC框架结构和8像素方法实现三维水纹的仿真。首先通过MFC的框架结构降低了编程的难度;其次通过采用8像素方法建立水波数学模型减少了计算工作量;最后通过偏微分方程绘制模拟圆形扩散水纹的效果。实验结果表明,该方法既减少了计算工作量,降低了编程难度又形象逼真的模拟了水纹动画仿真效果,对于在线实时游戏场景、影视动画制作中的雨滴水纹扩散效果的仿真模拟具有实际应用意义。     

热轧带钢卷取温度联合控制算法设计与仿真

在热轧带钢生产线上,卷取温度的精确控制对带钢质量是至关重要的。详细研究了一个实际的热轧带钢卷取温度控制系统。建立了一种简化的动态控制模型,并用一个改进的遗传算法在线调整模型的参数。基于该模型提出了一个包括冷却反馈控制、前馈及自适应联合控制算法的控制器。通过建立一个更精确的仿真系统,达到指导现场生产的目的。实践结果证明提出的控制方法是有效的,仿真系统也具有较大的实际意义。     

Implementation of synthetic turbulence inlet for turbomachinery LES

Large eddy simulation (LES) has the potential to model complex separated flows, where Reynolds Averaged Navier–Stokes (RANS) based methods often fail. An important aspect of LES is specifying correlated turbulent fluctuations at the inlet boundary. This is particularly important in turbomachines, where turbulence length scale and intensity play a key role in the correct prediction of component performance.In this work, a method is implemented into an unstructured Computational Fluid Dynamics (CFD) solver to impose correlated turbulent fluctuations in a compressible form. It is shown that compressibility effects are particularly important in turbomachinery and must be taken into account. The method uses a pre-processing method to generate a cube of isotropic, homogeneous turbulence. The velocity fluctuations so obtained are used to determine a fluctuating Mach number in order to evaluate the instantaneous total pressure and temperature fluctuations at domain inlet. In the authors knowledge this is one of the first attempts to define correlated fluctuations in a compressible form.The method is successfully applied to two turbomachinery related flows. Firstly, the jet flow from a propelling nozzle is investigated. Following this, the flow over a low pressure (LP) turbine blade is predicted. Results from the LES simulations show that modifications to the inlet conditions can significantly affect flow development. For the jet, changes in the shear layer and peak shear stress are shown, important in the context of high frequency sideline noise generated by the jet. Despite what is suggested in the literature the differences in shear stresses are important also in a non-swirling jet.For the LP turbine, incoming turbulent fluctuations modify the onset of transition and the extent of separation bubble. Without imposed turbulence fluctuations, loss is overpredicted by up to 50%. Moreover it is important to use a compressible solver. Despite the fact that the majority of the results proposed in literature on LP turbine is using incompressible solvers, the difference in terms of pressure coefficient, Cp, is comparable to turbulence contribution.