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| 1 | Optimization of Short Stroke Control Preset for Automatic Width Control of Hot Rolling Mill显示文摘Automatic width control is a key issue in hot strip rolling process. The edge rolling has been widely used in the roughing stand of hot strip mill to control the width of the slab. However, the edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. Based on the width reduction deformation curve of the head and tail along the longitudinal direction of slab, the short stroke control (SSC) technology has been developed to overcome this problem. The finite element method has been used to simulate the unsteady edge rolling process. Three short stroke control curves have been compared in order to obtain the best width control result. The optimized short stroke control curve has been applied to the automatic width control system of industrial hot rolling mill,and good performance is obtained. | DU Xiao-zhong YANG Quan LU Cheng WANG Ai-li Tieu A Kiet | 2010 | Journal of Iron and Steel Research(International)2010，17，6： | 12 |
| 2 | 金属塑性成形的晶体塑性学有限元模拟研究进展显示文摘综述了金属塑性成形过程中晶体塑性有限元模拟的理论背景和应用方面的研究进展,同时总结了国内研究者该领域的研究现状,指出了晶体塑性有限元模拟所要解决的问题及研究重点。晶体塑性理论起源于20世纪20 年代,包括单晶塑性本构理论和多晶塑性本构理论,能够深刻揭示材料变形的规律。与此同时,开始于30多年前的有限元法也已经日益成为求解材料成形理论公式的有效工具。晶体塑性有限元法作为一个强大的模拟工具将二者有机地结合在一起,已经广泛地用于模拟材料的微观结构和各种力学响应,越来越被材料界和力学界的研究者所重视;然而,无论是在理论方面还是应用方面晶体塑性有限元法都还不尽完善。未来晶体塑性有限元模拟的理论研究重点是建立系统的理论架构用于预测由滑移和孪晶引起塑性变形材料的各种力学响应,应用研究重点是运用各种模型模拟其他与织构相关的性能或参数。晶体塑性有限元模拟不仅能够深化人们对材料成形规律的理解, 而且可以不断推进晶体塑性理论的发展。 | 皮华春 韩静涛 薛永栋 TIEU A Kiet 姜正义 | 2006 | 机械工程学报2006，42，3： | 11 |
| 3 | Modeling uniaxial tensile deformation of polycrystalline Al using CPFEM显示文摘The crystal plasticity finite element modeling(CPFEM)is realized in commercial finite element code ABAQUS with UMAT subroutine on the basis of the crystal plasticity theory of rate dependent polycrystal constitutive relations in the mesoscopic scale.The initial orientations obtained by electron backscatter diffraction(EBSD)are directly input into the CPFEM to simulate the mechanical response of polycrystaUine 1050 pure Al in uniaxial tensile deformation.Two polycrystal models and two tensile strain rates were used in the simulations.The stress-strain curves of tensile deformation were analyzed.The predictions and the corre- sponding experiment result show reasonable agreement and slight deviation with experiments.The flow true stress of strain rate 0.01 s^(-1)is higher than that of strain rate 0.001 s^(-1).At the strain less than 0.05,the stress saturated rate of the experiment is higher than the simulated results.However,the stress saturated rate of the experiment becomes gentler than the corresponding simulated predictions at the strain over 0.05.Also,necking was simulated by the two models,but the necking strain is not well predicted.Tensile textures at strain 0.25 were predicted at the low strain rate of 0.001 s^(-1).The predictions are in good accord with the experimental results. | Huachun pi Jingtao Han Chuanguo Zhang A. Kiet Tieu Zhengyi Jiang | 2008 | Journal of University of Science and Technology Beijing2008，15，1： | 4 |
| 4 | 面心纯铝轧制织构的晶体塑性有限元模拟显示文摘基于率相关晶体塑性本构模型,分别将Taylor模型和有限单元模型两种多晶模型嵌入大型有限元程序ABAQUS,实现了晶体塑性学有限元模拟.直接将电子背散射衍射(EBSD)获取的晶粒初始取向输入晶体塑性有限元模型,预测了两种不同应变情况下面心1050纯铝轧制织构的演化.模拟结果与EBSD实验测得的织构演化结果有较好的一致性,随着变形程度的增加,预测织构与实测织构变得更加锋锐.经过比较,Taylor型模型预测出了{4411}〈11118〉的Dillamore取向,而有限单元模型预测出了铜型织构取向,比Taylor模型预测结果更接近实验验证结果.两种模型并不能预测出{011}〈211〉黄铜取向、{123}〈523〉S取向、{011}〈100〉Goss取向及其他理想取向. | 皮华春 韩静涛 章传国 A. K. Tieu 姜正义 | 2007 | 北京科技大学学报2007，29，9： | 3 |
| 5 | 纯铝单向压缩过程的晶体塑性有限元模拟显示文摘在率相关晶体塑性理论框架下,分别将Taylor模型和有限单元模型两种多晶模型嵌入有限元程序ABAQUS中,实现了纯铝单向压缩过程的晶体塑性有限元模拟。直接将电子背散射衍射(EBSD)获取的晶粒初始取向输入UMAT子程序,预测了单向压缩1050纯铝过程的力学响应与变形织构演化。结果表明:模拟力学响应结果与试验结果有较好的一致性,同时也存在一定偏差。随着真应变的增加,压缩丝织构(<110>织构)趋于锋锐,模拟结果与EBSD试验测得的织构演化结果能较好地吻合。 | 皮华春 韩静涛 章传国 李贺杰 A K Tieu 姜正义 | 2006 | 机械工程材料2006，30，11： | 3 |
| 6 | Stock-Price Forecasting Based on XGBoost and LSTM显示文摘Using time-series data analysis for stock-price forecasting(SPF)is complex and challenging because many factors can influence stock prices(e.g.,inflation,seasonality,economic policy,societal behaviors).Such factors can be analyzed over time for SPF.Machine learning and deep learning have been shown to obtain better forecasts of stock prices than traditional approaches.This study,therefore,proposed a method to enhance the performance of an SPF system based on advanced machine learning and deep learning approaches.First,we applied extreme gradient boosting as a feature-selection technique to extract important features from high-dimensional time-series data and remove redundant features.Then,we fed selected features into a deep long short-term memory(LSTM)network to forecast stock prices.The deep LSTM network was used to reflect the temporal nature of the input time series and fully exploit future con-textual information.The complex structure enables this network to capture more stochasticity within the stock price.The method does not change when applied to stock data or Forex data.Experimental results based on a Forex dataset covering 2008–2018 showed that our approach outperformed the baseline autoregressive integrated moving average approach with regard to mean absolute error,mean squared error,and root-mean-square error. | Pham Hoang Vuong Trinh Tan Dat Tieu Khoi Mai Pham Hoang Uyen Pham The Bao | 2022 | Computer Systems Science & Engineering2022，40，1： | 2 |
| 7 | 薄带冷轧接触力学(英文)显示文摘极薄带冷轧给轧制生产带来了挑战,其中包括接触力学、带材的凸度和表面质量。在考虑工作辊边部接触的前提下,采用自行开发的改良影响函数法对薄带的对称和非对称冷轧过程进行了分析。文章的重点是通过薄带冷轧来阐述辊缝接触力学,分析辊缝处的摩擦对轧制力学和带材凸度的影响,同时还对轧辊边部接触对轧制力学和带材凸度影响进行了讨论,认为轧辊边部接触将对工作辊边部磨损产生影响,并对轧制力计算值与实测值进行了比较。 | 姜正义 韦东滨 李贺杰 谢海波 朱洪涛 A. K. Tieu 刘相华 张晓明 | 2008 | 塑性工程学报2008，15，3： | 2 |
| 8 | Simulation of polycrystalline aluminum tensile test with crystal plasticity finite element method显示文摘The crystal plasticity was implemented in the finite element method(FEM) software ABAQUS through the user subroutine UMAT. By means of discretizing the space at the grain level with the Voronoi diagram method, a polycrystal model was built and used in the FEM analysis. The initial orientation of each grain was generated based on the orientation distribution function(ODF). The developed model was successfully applied in simulation of polycrystalline aluminium samples deformed by the tensile tests. The theoretical strain—stress relation was in good agreement with the experimental result. The simulation results show that the grain size has significant effect on the deformation behavior. The initial plastic deformation usually occurs at grain boundaries, and multiple slip often results in an enhanced local hardening at grain boundaries. | 司良英 吕程 K. Tieu 刘相华 | 2007 | 中国有色金属学会会刊:英文版2007，17，6： | 2 |
| 9 | The energy of a dynamical wave-emitting system in general relativity 显示文摘 | Cooperstock F I Tieu S | 2003 | Foundations of Physics2003，33，7： | 1 |
| 10 | Prospective study of perioperative factors predicting hypocalcemia after thyroid and parathyroid surgery 显示文摘 | Chia SH Weisman RA Tieu D | 2006 | Arch Otolaryngol Head Neck Surg2006，132，1： | 1 |
| 11 | Effect of rolling parameters on cold rolling of thin strip during work roll edge contact显示文摘 | Jiang Z Y Zhu H T Tieu A K | 2003 | Journal of Materials Processing Technology2003，140，123： | 1 |
| 12 | A simulation of three-dimensional metalrolling process by rigid-plastic finite element method显示文摘 | Jiang Z Y Tieu A K | 2001 | Journal of Material Processing Technology2001，112，： | 1 |
| 13 | Influence of shearing direction on slope fringe distributions in the presence of in-plane displacement and strain components in double-aperture speckle shearing interferometry显示文摘 | Wang K F Tieu A K Li E B | 2000 | Opt Commun2000，174，14： | 1 |
| 14 | High Temperature Oxide Scale Charac teristics of Low Carbon Steel in Hot Rolling 显示文摘 | Sun W H Tieu A K | 2004 | Materials Processing Technology2004，，155： | 1 |
| 15 | Robotic-assisted Roux-en-Y gastric bypass:update from 2 high-volume centers显示文摘 | Tieu K Allison N Snyder B | 2013 | Surg Obes Dis2013，9，2： | 1 |
| 16 | Mixed film lubrication of strip rolling using O/W emulsions显示文摘 | Kosasih P B Tieu A K | | 0，，： | 1 |
| 17 | A three-dimensional thermo-mechanical finite element model of complex strip rolling considering siticking and slipping friction显示文摘 | Jiang Z Y Tieu A K Lu C | 2002 | Journal of Materials Processing Technology2002，，： | 1 |
| 18 | Prospective study of perioperative pactors predicting hypocalcemia after thyroid and parathyroid surgery显示文摘 | Chia SH Weisman RA Tieu D | 2006 | Arch Otolaryngol Head Neck Surg2006，132，1： | 1 |
| 19 | Influence of in-plane displace- ment on slope fringe formation in electronic speckle shearing interferometry 显示文摘 | Wang K F Tieu A K | 2003 | Opt Commun2003，224，13： | 1 |
| 20 | Fluid resuscitation increases in- flammatory gene transcription after traumatic injury显示文摘 | Watters JM Tieu BH Todd SR | 2006 | J Trauma2006，61，2： | 1 |
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