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第41届中国控制会议

作者： Han Sun Yongqiang Bai Wenbo Zhang State Key Lab of Intelligent Control and Decision of Complex Systems and School of Automation Beijing Institute of Technology

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

In recent years,the introduction of Siamese network has brought new vitality to the object tracking ***,high-performance Siamese trackers cannot run at a real-time speed on mobile devices due to their complex and huge *** distillation is a common and effective model compression method,but it is difficult to be applied to the challenging task like object *** find out the fundamental cause is that the imbalance between the foreground and background in the object tracking task,which aggravates the problem of insufficient feature extraction ability of small ***,we propose the attention mask distillation(AMD) to help the student tracker focus on the foreground area faster and more *** attention mask can be easily obtained from the feature maps and brings fine-granularity to the traditional binary *** experimental results on OTB100 and VOT2018 show that our method enables the student tracker perform as well as the teacher *** the same time,it's able to run on the CPU at a hyper-real-time of 66 fps and achieves nearly 9 times model compression *** low computational and storage costs make it possible to deploy high-performance trackers on resource-constrained platforms.

关键词： Object Tracking Siamese Network Knowledge Distillation Attention Mask

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Parameter Estimation and Tracking Control of MIMO Linear Systems Without Prior Knowledge of Control Signs and Parameter Bounds

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IEEE Transactions on Automatic Control 2024年第6期70卷 3695-3710页

作者： Xu, Yuchun Zhang, Yanjun Zhang, Ji-Feng Chinese Academy of Sciences Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Beijing100190 China Beijing Institute of Technology School of Automation Beijing100081 China Beijing Institute of Technology State Key Lab of Automation Intelligent Unmanned Systems Beijing100081 China University of Chinese Academy of Sciences School of Mathematics Sciences Beijing100149 China Zhongyuan University of Technology School of Automation and Electrical Engineering Zhengzhou450007 China Chinese Academy of Sciences Academy of Mathematics and Systems Science Beijing100190 China

Dealing with the uncertain high-frequency gain matrix, denoted as Kp, is a fundamental problem in multivariable adaptive control systems. In this paper, we propose a new solution for parameter estimation and adaptive control for a general class of multi-input multi-output discrete-time linear time-invariant systems. The proposed scheme does not require any prior knowledge of the sign or bound information of Kp, and thus, significantly relaxes the design conditions in traditional multivariable adaptive control systems. Compared with the commonly used Nussbaum gain or multi-model techniques for addressing the unknown signs of Kp, the proposed scheme does not rely on any additional design conditions or any switching mechanism, while still ensuring closed-loop stability and asymptotic output tracking. Specifically, an output feedback adaptive control law is developed based on a matrix decomposition technique, which leads to derivation of a modified estimation error model. Subsequently, a gradient-based parameter update law is formulated only relying on the non-zero condition of the leading principle minors of Kp. Through designing gain functions and stable filters, the controller is always non-singular and does not involve any causal contradiction problem. Simulation study showcases the design process and demonstrates the effectiveness of the proposed scheme. © 1963-2012 IEEE.

关键词： MIMO systems

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Review on coal-based reduction and magnetic separation for refractory iron-bearing resources

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2087-2105页

作者： Qiang Zhang Yongsheng Sun Yuexin Han Yanjun Li Peng Gao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources Shenyang 110819China

The application of coal-based reduction in the efficient recovery of iron from refractory iron-bearing resources is comprehensively ***,the development and beneficiation of refractory iron-bearing resources have attracted increasing ***,the effect of iron recovery by traditional beneficiation methods is ***-based reduction followed by magnetic separation is proposed,which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting *** metallic iron particles aggregate and grow,and the particle size continuously increases to be suitable for magnetic *** optimization and application of coal-based reduction have been abundantly researched.A detailed literature study on coal-based reduction is performed from the perspectives of thermodynamics,reduction kinetics,growth of metallic iron particles,additives,and *** coal-based reduction industrial equipment can be developed based on the existing pyrometallurgical equipments,rotary hearth furnace and rotary kiln,which are introduced ***,coal-based reduction currently mainly adopts coal as a reductant and fuel,which may result in high levels of carbon dioxide emissions,energy consumption,and *** innovation aiming at decreasing carbon dioxide emissions is a new trend of green and sustainable development of the steel ***,the substitution of coal with clean energy(hydrogen,biomass,etc.)for iron oxide reduction shows promise in the future.

关键词： refractory iron-bearing resources coal-based reduction iron recovery equipment carbon dioxide emissions

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Sensing characteristics of a limiting current oxygen sensor with (8YSZ)0.85(Cr2O3)0.15 dense diffusion barrier

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IONICS 2023年第3期29卷 1221-1228页

作者： Qi, Min Wang, Xiangnan Shu, Hui Dong, Yihang Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China Shandong Univ Sci & Technol Sch Mat Sci & Engn Qingdao 266590 Peoples R China Guangdong Acad Sci Inst Resources Utilizat & Rare Earth Dev Guangzhou 510650 Peoples R China State Key Lab Rare Met Separat & Comprehens Utiliz Guangzhou 510651 Peoples R China Trumps New Energy Technol Co Ltd Xian 713702 Peoples R China

(8YSZ)(1-x)(Cr2O3)(x) (x = 0, 0.05, 0.10, 0.15) are prepared by the co-precipitation method. Diffraction peaks of the samples belonged to the cubic fluorite structure. Conductivity decreases first and then increases with increasing Cr2O3 content. An oxygen sensor based on 8YSZ solid electrolyte and (8YSZ)(0.85)(Cr2O3)(0.15) diffusion barrier is prepared by the Pt slurry bonding method. The sensor has a limiting current plateau at 2% oxygen concentrations within 720 similar to 870 degrees C. The oxygen sensor has a linear relationship between the log I-L and 1000/T. At 850 degrees C, a linear relationship between the limiting current I-L and oxygen concentration x(O-2) is established for the oxygen sensor. The oxygen sensor is provided with a limiting current plateau within the experimental concentration division, and the limiting current plateau is not affected by x(CO2) and p(H2O). I-V curves of the oxygen sensor overlap, and the limiting current plateaus are almost equal under the long-term high-temperature operating conditions of 144 h.

关键词： (8YSZ)(1-x)(Cr2O3)(x) Solid electrolyte Limiting current Oxygen sensor

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6th International Conference on ThermoMechanical Processing, TMP 2022

作者： Jing, Yi Xu, Yunbo Yu, Yongxin Wang, Dongxiao Yu, Yongmei State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang110819 China School of Mechanical and Power Engineering Shenyang University of Chemical Technology Shenyang110142 China

ISBN: (纸本)9787502492441

In this paper, different resistance spot welding strategies have been carried out for Q&P980 steel with thickness of 1.8 mm, including similar welding (Q&P+Q&P, Q/Q) and dissimilar welding (Q&P+DP, Q/D). The study found that the nugget of dissimilar welding can be divided into four regions, fusion zone, partially melted zone, heat-affected zone and base metal. An obvious partially melted zone accompanied by liquation crack characteristics can be observed on the Q&P steel, but not on the DP steel. There is local softening in the heat-affected zone on the DP side of the D/Q specimen, and the hardness of the nugget zone is also slightly lower than that of the Q/Q specimen. When the welding parameters are the same, the nugget sizes obtained under the two welding strategies are approximately the same, the shear-tensile properties of D/Q specimens are significantly better than those of Q/Q specimens. © TMP 2022 - Proceedings. All rights reserved.

关键词： Spot welding

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Strengthening mechanisms of reduced activation ferritic/martensitic steels:A review

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 335-348页

作者： Jin-hua Zhou Yong-feng Shen Nan Jia Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China The State Key Lab of Rolling&Automation Northeastern UniversityShenyang 110819China

This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic(RAFM)***-angle grain boundaries,subgrain boundaries,nano-sized M_(23)C_(6),and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength.M23C6 carbides are easily coarsened under high temperatures,thereby weakening their ability to block *** properties are improved through the reduction of M23C6 ***,the loss of strength must be compensated by other strengthening *** review also outlines the recent progress in the development of RAFM *** dispersion-strengthened steels prevent M23C6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced *** plastic deformation methods can substantially refine subgrains and MX carbides in the *** thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain *** procedure increases the creep life of TMT(thermo-mechanical treatment)9Cr-1W-0.06Ta steel by~20 times compared with those of F82H and Eurofer 97 steels under 550℃/260 MPa.

关键词： reduced activation ferritic/martensitic steel strengthening mechanism high-angle grain boundary subgrain boundary precipitate

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New Insights into Factors Affecting Austenite Mechanical Stability in Medium Mn Steels 6

New Insights into Factors Affecting Austenite Mechanical Sta...

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6th International Conference on ThermoMechanical Processing, TMP 2022

作者： Jing, Songyang Ding, Hua School of Materials Science & Engineering Northeastern University Shenyang110819 China State Key Lab of Rolling and Automation Northeastern University Shenyang110819 China

ISBN: (纸本)9787502492441

The mechanical stability of austenite plays a key role in adjusting the mechanical properties of medium Mn steels. It is generally suggested that the mechanical stability of austenite decreases gradually with increasing annealing temperature in the two-phase region. In this study, it was found that the austenite in samples annealed at different temperatures exhibited similar and low mechanical stability. The presence of austenite grains containing low Mn content caused by the non-equilibrium Mn partition and the strain incompatibility between austenite and tempered martensite with inactive recovery are responsible for the low austenite mechanical stability in the experimental steel annealed at a low temperature in the two-phase. This study emphasized the critical role of the existence of non-equilibrium Mn partition in austenite and the recovery of tempered martensite, providing new insights into the regulation of austenite mechanical stability. © TMP 2022 - Proceedings. All rights reserved.

关键词： Mechanical stability

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Eﬀects of manganese and chromium on sulﬁde stress cracking in 125 ksi grade high-strength low-alloyed steel for oil country tubular goods

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Corrosion Science 2025年 245卷

作者： Wu, Zihan Wang, Chao Wang, Yunkai Si, Tingzhi Kang, Jian Yuan, Guo State Key Laboratory of Rolling and Automation Northeastern University Shenyang110004 China School of Materials Science and Engineering Anhui University of Technology Maanshan243002 China

In this study, 125 ksi-grade oil casing steels with three chromium and two manganese contents were investigated through orthogonal experiments, and the resulting sulphide stress cracking (SSC) behaviours were analysed using the NACE-A method. The impact of manganese and chromium on the SSC performance was examined through a series of experiments involving microstructural assessments and hydrogen permeation tests. Limiting the chromium and manganese content proved to be pivotal in reducing the quantity of reversible hydrogen traps and Σ3 grain boundaries. Therefore, the proportion of manganese sulphide (MnS) precipitation was reduced, ultimately improving the resistance of the material to SSC. © 2025 Elsevier Ltd

关键词： Grain boundaries

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Controlling Carbide Evolution to Improve the Ductility in High Specific Young’s Modulus Steels

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1703-1711页

作者： Peng Chen Xin Xu Chao Lin Fuming Yang Jiachen Pang Xiaowu Li Hongliang Yi Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang110819China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Angang Steel Company Limited Technology Centre Anshan114009China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang110819China

A high specific Young’s modulus steel could be achieved by introducing a large fraction of kappa-carbides(κ-carbide),and its ductility was improved by efficiency divorced eutectoid transformation(DET)*** this steel,carbon and aluminum contents affect not only the carbide fraction,but also the type and morphology of carbides,and consequently the mechanical *** this work,the alloy was designed by considering both the carbide morphology and Young’s modulus,and the carbides in the high specific Young’s modulus steels were adjusted by controlling carbon content in a suitable range for achieving a good combination of strength and *** detailed microstructure evolution process during DET reaction was studied,and it was found that a higher austenitizing temperature and the cooling rate lower than 300℃ h^(−1) are *** blocky carbides could be avoided by designing the carbon content in a limited content *** microstructure-property relationship of the experimental steels was also discussed for giving an impetus to the future development of high specific Young’s modulus steels.

关键词： κ-carbide High aluminum High carbon Divorced eutectoid transformation Ductility

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Quasi-in-situ observations of crack propagation and microstructure evolution of high manganese austenitic steel at-196 °C

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ENGINEERING FRACTURE MECHANICS 2022年 268卷 1页

作者： Chen, Jun Li, Shuang Ren, Jia-kuan Liu, Zhen-yu Northeastern Univ State Key Lab Rolling & Automation Shenyang 110819 Peoples R China

The crack propagation behaviors and microstructure characteristics in the high manganese austenitic steel were comprehensively investigated by quasi-in-situ observations at-196 C. The steel exhibits a superior fracture toughness at-196 degrees C than at room temperature. It is found that a severe plastic deformation is necessary for a crack initiation. Although the main crack propagates along the {111} planes due to the plastic strain localization caused by an extensive planar slip, the steel still possesses a superior crack propagation resistance, which is attributed to the activations of multiple twinning and slipping systems, which provide two positive effects on blocking a crack propagation: (1) the plastic deformation further enhanced by multiple twinning and slipping systems as well as (2) a tortuous crack propagation path caused by numerous twin boundaries. Besides, the pronounced deflections at grain boundaries also have a large contribution to block a crack propagation.

关键词： High manganese austenitic steel Quasi-in-situ Crack propagation Twinning Planar slip

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