平整分卷机组张力装置张力预报研究

在分析张力装置力学原理的基础上，建立了张力预报的解析预报模型和非线性有限元预报模型，以有限元软件MSC．MARC为平台，用Yisual Basic6．0可视化编程语言开发建立了解析公式可视化软件和上张力辊压下制度数值模拟与仿真预报系统，在梅钢热轧厂验证了张力预报的准确性与可靠性.     

冷轧带钢张力测量

以偏八辊轧机的张力测试为基础，探讨用张力测量装置的压力测定带钢张力的问题，建立了利用导向辊轴承处的压力测量带钢张力的计算模型，实测数据证实了张力计算机计算模型的实用可靠，可以用于测量带钢张力和张力的计算机控制。     

H型钢连轧张力的研究

本文首次将前滑与前、后张力的解析关系式代人到连轧张力变形微分方程中，从而导出了不包含实验系数的H型锕多机座连轧张力公式。在三机架可逆式连轧机组上进行了轧制实验研究，实验结果与计算结果吻合良好，进一步完善了H型钢的连轧理论。     

三辊张力装置增张能力的数值模拟分析

张力调节是板带材生产工艺中的重要环节,为研究平整分卷线上三辊张力装置的增张机理和张力调节能力,采用弹塑性有限元方法对其工作过程进行数值模拟,得到了板厚、开卷张力、上张力辊压下量和设备结构参数等对张力装置增张能力的影响规律。将有限元模拟结果作为训练样本,结合国内某厂实测数据,建立了三辊张力装置增张能力的BP神经网络预测模型,预测结果与实测数据吻合良好,实现了张力调节定量控制。     

带传动活套辊的立式活套的工艺分析及张力设定模型

以连续冷轧后处理线中立式活套入口的纠偏辊为张力计算基准点，通过叠加张力损失得到活套入、出口张力的模型计算思路，分析了活套内有传动活套辊时，张力损失的计算与分布。实验表明，此套模型计算得到的活套入、出口张力及张力损失等数值的精度和稳定性能满足模型在线控制的要求，为活套张力设定提供了实用的理论依据和模型方法。     

连续退火线带钢张力控制数学模型研究

 针对现代化冷轧宽带钢连续退火生产线上,连续运行中带钢的张力控制数学模型的建立问题,通过解析研究带钢的温度和速度对带钢张力大小及波动的影响而推导出其间关系模型,从带钢打滑机理出发推导出带钢与炉辊之间的打滑描述模型,进而综合建立了考虑多干扰因素的炉内带钢动态张力实时计算模型,提出了新的可改善张力控制效果的前馈控制策略,并进行了相关的仿真验证。     

三辊张力单元张力与带钢厚度、材质及压下量关系的研究

研究了三辊张力单元产生的张力与带钢厚度、带钢材质及压下量的关系,建立了相应的数学力学模型,得出了张力计算式,计算结果与实际值相比较误差很小.其研究结果可用来指导张力单元装置的设计、操作模式的制定,并为解决类似力学课题提供了参考.     

带张力轧制H型钢时腹板前滑的研究

本文较精确地分析了H型钢连轧时在万能孔型中作用在轧件上的各种水平方向作用力,最终建立了前滑与前、后张力之间的解析关系式。在三机架可逆式连轧机组上进行了实尺寸连轧实验研究,实验结果与计算结果吻合良好,为正确计算连轧张力,实现最小张力控制提供了理论依据。     

连续热镀锌机组的带钢张力控制

本文论述了带钢张力控制的主要作用，张力的设定和跟踪；张力装置的制动功能和联锁关系，以及张力控制方式对精度及张力控制范围的影响；并对张力装置传动采用交流电动机的优越怀进行了说明。     

带传动活套辊的立式活套的工艺分析及张力设定模型

以连续冷轧后处理线中立式活套入口的纠偏辊为张力计算基准点,通过叠加张力损失得到活套入、出口张力的模型计算思路,分析了活套内有传动活套辊时,张力损失的计算与分布。实验表明,此套模型计算得到的活套入、出口张力及张力损失等数值的精度和稳定性能满足模型在线控制的要求,为活套张力设定提供了实用的理论依据和模型方法。     

推/张力轧制不锈钢/碳钢复合钢筋的有限元模拟与实验研究

为了研究推/张力(0～15 MPa)对不锈钢(Cr18Ni8,2 mm壁厚管)/碳钢(0.06%～0.12%C,Φ16 mm,圆棒)复合钢筋轧制过程的影响,应用有限元软件Msc.Marc建立了复合钢筋轧制过程的有限元模型。通过模拟考察了推/张力对不锈钢/碳钢复合钢筋的宽展变形,结合面的接触应力和不锈钢圆周壁厚的影响,重点通过实验考察了推力轧制对两金属结合强度的影响。结果表明,施加张力后轧件宽展量减小,而施加推力后其值增加;不锈钢壳与碳钢芯间的接触应力随推力的增加、张力的降低而增大。推力轧制有利于两金属的复合,可以提高复合不锈钢和碳钢芯的结合强度。     

Estimation of Tension in Cables with Intermediate Elastic Supports Using Finite-Element Method

Cables with intermediate elastic supports are widely used in bridge engineering, but there is a lack of effective methods for estimating the tensions in these cables. In this paper, an analytical form of the equilibrium equation for a tension bar has been used to provide a shape function to develop a suitable finite-element model for a cable. A program for estimating the tension in cables with intermediate elastic supports has been developed in which the bending stiffness of the cable, the stiffness of the end restraints, and the stiffness of the intermediate supports are taken into account by using this element and MATLAB. The program has been verified by comparison of the results from laboratory experiments. The method has been applied to compute the tension in the tie bars of a concrete-filled steel tube arch bridge. This demonstrates that the cable tension estimated by the present method is suitably accurate.     

张力对PQF连轧成形过程的影响机制

 基于PQF限动芯棒连轧孔型及工艺特点,建立PQF连轧全过程三维非线性有限元模型,预报了荒管的尺寸形状和力学性能参数,对比某厂现场数据,两者吻合良好。分析PQF连轧过程中张力的形成机制,研究张力对金属流变规律、中性曲线分布、钢管截面尺寸、设备力能参数等的影响规律,为PQF连轧工艺设定优化和产品质量控制提供理论指导。     

Analytical Model of Circular CFRP Confined Concrete-Filled Steel Tubular Columns under Axial Compression

This study intends to provide a simplified analytical model of the laterally confined concrete filled steel tube (CCFT) column system which adopts carbon-fiber-reinforced polymer (CFRP) jackets in order to make up for major defects of the traditional concrete filled steel tube (CFT) column system. This CCFT analytical model, by adding one additional parameter for CFRP confinement to the CFT column analytical solution, is greatly simplified and expedites the analytical processes to explain the stress-strain relationship of the CCFT column system. In the study, several types of the CCFT column systems with different parameters are analyzed by the proposed simplified analytical model and its associated numerical program (USC-CFT). To verify the accuracy of the analytical model, this study compares the load-strain relationship calculated by USC-CFT both to the experimental results conducted by the traditional method and to the results calculated by the computer-aided finite element method (FEM) analysis method. This study shows equilibrium conditions, deformation compatibilities, constitutive models, and an analysis procedure used in the proposed simplified analytical solution and presents finite element models and analysis procedure used in FEM analysis.     

Optimising tension levelling process by means of genetic algorithms and finite element method

Abstract

This paper presents a method based on genetic algorithms and the finite element method which is useful for automatically adjusting the parameters of a tension levelling process. First, the optimum parameters of the steel to be used in the simulation programme are sought. The process consists of simulating controlled cyclical deformation tests on finite element (FE) models of standard steel test pieces with different laws of cyclical behaviour. Genetic algorithms are used to optimise the parameters of the simulation model so that the behaviour of the material is as close as possible to the results obtained in real experimental tests. This ensures that the behaviour of the material in the FE model is as realistic as possible. The model of behaviour of the material selected is used to design and check out a second tension levelling FE model. Based on this second model, the roll penetration, the lengthwise tension and the strip feedrate are adjusted. There is also optimisation with genetic algorithms so that the final residual tensions in the product are below a specified threshold and as even as possible. For a solution to be considered as valid, it must be confirmed that the steel plate is subject to the tensions envisaged at various process control points. From the best solutions found, the one with the fastest feedrate is selected so as to maximise output.     

带钢拉弯矫直机机架结构的优化分析

拉弯矫直机下机架现在常采用钢板焊接结构,组成下机架钢板的厚度、材质的差异,不仅对整体刚度影响较大,还直接影响到结构重量、产品成本。运用有限元方法对一种带钢拉弯矫直机的下机架在受载后的变形进行分析。以设备的总体刚度为目标值,重量、安全系数等为约束函数,选择钢板的最佳厚度值,为拉弯矫直机的结构最优化设计提供了参考。     

张力对大宽厚比铝箔板形影响的有限元分析

在铝箔宽厚比为5300的条件下，采用大型商用显式动力学有限元分析软件ANSYS／LS—DYNA模拟了铝箔轧制状态，得到了改变前后张力时，铝箔的出口厚度、轧制压力、压下方向应变的横向分布规律，分析了张力变化对铝箔板形的影响，提出铝箔轧制宜采用的最佳张力制度。