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Three-Dimensional Thermo-mechanical Coupled FEM Simulation for Hot Continuous Rolling of Large-Diameter Mandrel Bar

Journal of Materials Science & Technology 2003年第Z1期19卷 228-230页

作者： Huiping HONG Yonglin KANG Changtao feng xiqiang CHEN School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China

Based on the important boundary conditions of rolling simulation including friction, heat conduction and interactionsof the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrel round bar (200 mm indiameter) in 6VH-stand hot tandem mill are successfully simulated by three-dimensional coupled thermomechanicalelastoplastic finite element method (FEM). The distributions of stress, strain, temperature and the rolling force andtorque for the two-pass and four-pass continuous rolling are calculated respectively. Thus, the two and four-passroll schedules are verified, respectively. The simulation results show that it is safe to produce 200 mm round barby the two-pass (oval pass and round pass) continuous rolling on the existing equipment compared to the four-passcontinuous rolling. There are concave surfaces and increased widths occurring at the end of rolled billet due touneven deformations between the outside and inside of the workpiece as well as the free spreading close to the rollgap of the final pass.

关键词： Mandrel, Round bar, Hot continuous rolling, Thermomechanical coupled analysis,Finite element method.

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Passive source range estimation with a single receiver in shallow water

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Chinese Journal of Acoustics 2015年第1期34卷 1-14页

作者： QI Yubo ZHOU Shihong REN Yun WANG Dejun LIU Jianjun feng xiqiang State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences University of Chinese Academy of Sciences Qingdao Branch Institute of AcousticsChinese Academy of Sciences

An approach for long-range passive impulsive source ranging with a single receiver in shallow water is proposed, which utilizes the frequency spectrum of the warped signal autocor- relation function via warping transform. For an ideal waveguide, there are invariable frequency features both in the frequency spectrum of the warped signal corresponding to modal cut-off frequencies and the warped signal autocorrelation function due to modal interference. These intrinsic frequency features can be used to passive source ranging. So, the approximate rela- tionship between the frequency of warped signal at an unknown source range and the intrinsic frequency extracted by the time warping transform is derived. These rules can be generalized to an actual shallow water waveguide. Employing an acoustic model to offer the invariable frequency spectrum features, the impulsive signal data collected by a single hydrophone in the North Yellow Sea in December 2011 are analyzed to verify the proposed source ranging ap- proach. The estimated ranges are in good agreement with the ranges measured by GPS, and the mean relative error of range estimation is less than 10%.

关键词： Passive source range estimation with a single receiver in shallow water mode

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浅海中利用单水听器的声源被动测距

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声学学报 2015年第2期40卷 144-152页

作者：戚聿波周士弘任云刘建军王德俊冯希强中国科学院声学研究所声场声信息国家重点实验室北京100190 中国科学院大学北京100049 中国科学院声学研究所北海研究站青岛266023

针对浅海声波导中远距离脉冲声源被动测距问题,提出了一种利用单水听器接收信号自相关函数进行warping变换的声源被动测距方法。理想水下声波导中,接收信号warping变换输出的傅里叶变换频谱中具有不变性频率特征,即与声源距离无关的各... 详细信息

针对浅海声波导中远距离脉冲声源被动测距问题,提出了一种利用单水听器接收信号自相关函数进行warping变换的声源被动测距方法。理想水下声波导中,接收信号warping变换输出的傅里叶变换频谱中具有不变性频率特征,即与声源距离无关的各简正波截止频率;信号自相关函数中不同简正波相干成分也存在不变性频率特征;推导了未知声源距离时特征频率提取值与不变性频率特征之间的近似关系式。这些规律可推广到实际浅海声波导,并用于声源被动测距。利用声场计算模型来提供具有不变性频率特征的频谱,对2011年12月北黄海海域水声实验中单水听器接收的脉冲声数据进行了处理,验证了方法的有效性,测距结果和实际距离符合良好,平均测距误差在10%以内。

关键词：声源定位水听器简正波自相关函数频率特征测距方法脉冲声频谱特征截止频率傅里叶变换

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Understanding the local structure and thermophysical behavior of Mg-La liquid alloys via machine learning potential

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 439-449页

作者： Jia Zhao Taixi feng Guimin Lu National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China Joint International Laboratory for Potassium and Lithium Strategic Resources East China University of Science and TechnologyShanghai 200237China

The local structure and thermophysical behavior of Mg-La liquid alloys were in-depth understood using deep potential molecular dynamic(DPMD) simulation driven via machine learning to promote the development of Mg-La alloys. The robustness of the trained deep potential(DP) model was thoroughly evaluated through several aspects, including root-mean-square errors(RMSEs), energy and force data, and structural information comparison results;the results indicate the carefully trained DP model is reliable. The component and temperature dependence of the local structure in the Mg-La liquid alloy was analyzed. The effect of Mg content in the system on the first coordination shell of the atomic pairs is the same as that of temperature. The pre-peak demonstrated in the structure factor indicates the presence of a medium-range ordered structure in the Mg-La liquid alloy, which is particularly pronounced in the 80at% Mg system and disappears at elevated temperatures. The density, self-diffusion coefficient, and shear viscosity for the Mg-La liquid alloy were predicted via DPMD simulation, the evolution patterns with Mg content and temperature were subsequently discussed, and a database was established accordingly. Finally, the mixing enthalpy and elemental activity of the Mg-La liquid alloy at 1200 K were reliably evaluated,which provides new guidance for related studies.

关键词： magnesium-lanthanum liquid alloys local structure macroscopic properties thermodynamic behavior deep potential mo-lecular dynamic simulation

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Three-Dimensional Thermo-Mechanical Coupled FEM Simulation for Hot Continuous Rolling of Large-Diameter Mandrel Bar

Three-Dimensional Thermo-Mechanical Coupled FEM Simulation f...

引用

The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Huiping HONG, Yonglin KANG, Changtao feng and xiqiang CHEN School of Materials Science and Engineering, University of Sicence and Technology Beijing, Beijing 100083,China Baoshan Iron and Steel Co., Ltd., Shanghai 201900,China

Based on the important boundary conditions of rolling simulation including friction, heat conduction and interactions of the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrel round bar (200mm in diameter) in 6VH-stand hot tandem mill are successfully simulated by three dimensional coupled thermo-mechanical elastoplastic Finite Element Method (FEM). The . distributions of stress, strain, temperature and the rolling force and torque for the two-pass and four-pass continuous rolling are calculated respectively. Thus, the two and four-pass roll schedules are verified, respectively. The simulation results show that it is safe to produce 200mm round bar by the two-pass (oval pass and round pass) continuous rolling on the existing equipment compared to the four-pass continuous rolling. There are concave surfaces and increased widths occurring at the end of rolled billet due to uneven deformations between the outside and inside of the workpiece as well as the free spreading close to the roll gap of the final pass.

关键词： Mandrel Round bar Hot continuous rolling Thermo-mechanical coupled analysis Finite Element Method

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三维有限元分析张力对连轧大规格芯棒钢变形及温度的影响

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特殊钢 2003年第2期24卷 10-12页

作者：洪慧平康永林冯长桃陈溪强韩畴北京科技大学北京100083 宝山钢铁股份有限公司

采用MSC .Marc Autoforge 3 .1三维热力耦合弹塑性有限元软件对Φ2 3 0mm合金钢热连轧过程进行了有限元模拟仿真 ,分析了轧辊转速变化引起张力变化对轧件应力、应变、温度分布、轧制力能参数变化以及轧件宽展等的影响。

关键词：棒材三维有限元分析张力连轧芯棒钢变形温度

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椭-圆孔型连轧大圆钢三维热力耦合弹塑性有限元分析

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特殊钢 2002年第5期23卷 5-8页

作者：洪慧平康永林冯长桃陈溪强韩畴北京科技大学北京100083 宝山钢铁股份有限公司

采用MSC .Marc三维大变形热力耦合弹塑性有限元软件和接触分析技术 ,对Φ2 3 0mm大圆钢两机架热连轧过程中轧件三维变形进行了有限元仿真 ,计算了轧件主要力能参数的分布值和极值 ,以此对轧辊强度、孔型尺寸及相关的轧制工艺参数进行分... 详细信息

采用MSC .Marc三维大变形热力耦合弹塑性有限元软件和接触分析技术 ,对Φ2 3 0mm大圆钢两机架热连轧过程中轧件三维变形进行了有限元仿真 ,计算了轧件主要力能参数的分布值和极值 ,以此对轧辊强度、孔型尺寸及相关的轧制工艺参数进行分析 ,得出采用道次小变形量和快速轧制工艺 ,有助于减缓热作模具钢轧后端部表面残余应力升高和温度降低。

关键词：椭-圆孔型连孔大圆钢有限元分析接触分析

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Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang feng Gao Yu-Gui Peng Peng Wu Zong-Lin Li Xue-feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

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热作模具钢立椭孔中变形时温度场的三维模拟仿真

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特殊钢 2002年第6期23卷 9-11页

作者：洪慧平康永林冯长桃陈溪强韩畴北京科技大学北京100083 宝山钢铁股份有限公司

采用CAE模拟仿真软件MSC .Marc ,对热作模具钢在立椭孔中热变形的温度分布规律进行了三维模拟仿真研究 ,所得结果对轧制工艺方案的制定具有重要作用。

关键词：仿真热作模具钢立椭孔型温度场三维模拟 MSC.Marc 轧制工艺有限元

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开轧温度对Φ250mm芯棒钢热连轧力能参数影响有限元分析

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特殊钢 2003年第1期24卷 18-19页

作者：洪慧平康永林冯长桃陈溪强韩畴北京科技大学材料科学与工程学院北京100083 宝山钢铁股份有限公司

采用MSC .Marc/Autoforge 3 .1软件 ,对不同开轧温度 (95 0℃、10 0 0℃、10 5 0℃ )条件下Φ2 5 0mm热作模具钢热连轧过程进行了模拟仿真 ,准确地分析了开轧温度对连轧过程轧制力和力矩的影响。

关键词：开轧温度芯棒钢热连轧有限元分析力能参数

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