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Optimization of the Production Organization Pattern in Tangshan Iron and Steel Co., Ltd.

Journal of Iron and Steel Research International 2014年第S1期21卷 17-22页

作者： zong-xi gu An-jun XU Jin-bao CHANG Shuang-wu LI You-bing xiANG State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgy and Ecology Engineering University of Science and Technology Beijing Tangshan Iron and Steel Company of Hebei Iron and Steel Group

High-efficiency production organization should be simple and "laminar". A one to one "laminar flow" operation mechanism is supposed to be accepted as a prerequisite to build high-efficiency clean steel "production platform". Concerning the fact that establishing a one to one "laminar flow" production pattern is impossible at Tangshan Iron and Steel Co., Ltd., "quasi-laminar flow" production pattern was evaluated. Result shows that rolling bar products of various specifications have great impact on the liquid steel supply model between BOF and CC. Considering the process matching issue of steelmaking-continuous casting-rolling process in bar production line, a "quasi-laminar flow" production pattern between BOF and CC was proposed according to different rolling specification in bar mills. Through analysis and research on current production pattern, combined with principles and strategy for BOF workshop control, and taking the plant layout into account, "quasi-laminar flow" production pattern was finally established. Moreover, Gantt chart of "quasi-laminar flow" production pattern was drawn. It is shown that the relative "order degree" of the "quasi-laminar flow" production pattern rises, which is conductive to production scheduling and ladle operation turnaround in comparison with "turbulence" production pattern. While a careful evaluation should be conducted due to the fluctuant temperature drop caused by the inevitable inserted heats and decreased operation rate of inserted BOF before adapting the production pattern.

关键词： steelmaking-casting process matching between converters and continuous casters 'quasi-laminar flow' production pattern Gantt chart

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Palladium-Catalzyed Atroposelective 16-Membered Macrocyclization: Total Synthesis of lsoplagiochin D

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Chinese Journal of Chemistry 2020年第10期38卷 1081-1085页

作者： Junwei xi Zhenhua gu Hefei National Laboratory for Physical Sciences ot the Microscale and Department of ChemistryUniversity of Science and Technology of China96 Jinzhai RoodHefeiAnhui 230026China Center for Excellence in Molecular Synthesis of CAS HefeiAnhui 230026China

Summary of main observation and conclusion Isoplagiochin D is a ring-strained macrocyclic bisbibenzylis,which showed stable axial chirality in one biaryl structure,and semistable axial chirality in the other biaryl *** reported here an unprecedented example for the catalytically asymmetric synthesis of ring-strained atropisomers via Pd-catalyzed macrocyclization between benzyl halides and *** newly developed Pd-catalyzed asym-metric macrocyclization protocol enabled us a quick synthesis of isoplagiochin D in a highly enantioselective manner.

关键词： cyclization benzyl catalyzed

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Modified bottleneck-based heuristic for large-scale job-shop scheduling problems with a single bottleneck

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Journal of Systems Engineering and Electronics 2007年第3期18卷 556-565页

作者： Zuo Yan gu Hanyu xi Yugeng Inst. of Automation Shanghai Jiaotong Univ. Shanghai 200240 P. R. China

A modified bottleneck-based （MB） heuristic for large-scale job-shop scheduling problems with a welldefined bottleneck is suggested, which is simpler but more tailored than the shifting bottleneck （SB） procedure. In this algorithm, the bottleneck is first scheduled optimally while the non-bottleneck machines are subordinated around the solutions of the bottleneck schedule by some effective dispatching rules. Computational results indicate that the MB heuristic can achieve a better tradeoff between solution quality and computational time compared to SB procedure for medium-size problems. Furthermore, it can obtain a good solution in a short time for large-scale jobshop scheduling problems.

关键词： job shop scheduling problem bottleneck shifting bottleneck procedure.

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Classical Dynamics of a Nucleon in Heavy Nuclei

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Chinese Physics Letters 1998年第5期15卷 318-320页

作者： gu Jian-zhong ZHAO En-guang ZHUO Yi-zhong WU xi-zhen zong Hong-shi Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080 China Institute of Atomic Energy Beijing 102413

Within the framework of the two-center shell model,the classically dynamical behaviour of a nucleon in heavy nuclei is investigated when nuclear shape parameters are changed *** is found that there is a good quantum-classical correspondence of nucleonic regular(chaotic)motion so that Bohigas,Giannoni and Schmit conjecture is confirmed once again.

关键词： behaviour chaotic correspondence

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Effect of Trace Addition of Ceramic on Microstructure Development and Mechanical Properties of Selective Laser Melted AlSi10Mg Alloy

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Chinese Journal of Mechanical Engineering 2020年第2期33卷 56-68页

作者： Yuxin Li Dongdong gu Han Zhang Lixia xi College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Selective laser melting(SLM)is an emerging additive manufacturing technology for fabricating aluminum alloys and aluminum matrix ***,it remains unclear how to improve the properties of laser manufactured aluminum alloy by adding ceramic reinforcing *** the effect of trace addition of TiB2 ceramic(1%weight fraction)on microstructural and mechanical properties of SLM-produced AlSi10Mg composite parts was *** densification level increased with increasing laser power and decreasing scan speed.A near fully dense composite part(99.37%)with smooth surface morphology and elevated inter-layer bonding was successfully obtained.A decrease of lattice plane distance was identified by X-ray diffraction with the laser scan speed decreased,which implied that the crystal lattices were distorted due to the dissolution of Si and TiB2 particles.A homogeneous composite microstructure with the distribution of surface-smoothened TiB2 particles was present,and a small amount of Si particles precipitated at the interface between reinforcing particles and *** contrast to the AlSi10Mg alloy,the composites showed a stabilized microhardness distribution.A higher ultimate tensile strength of 380.0 MPa,yield strength of 250.4 MPa and elongation of 3.43%were obtained even with a trace amount of ceramic *** improvement of tensile properties can be attributed to multiple mechanisms including solid solution strengthening,load-bearing strengthening and dispersion *** research provides a theoretical basis for ceramic reinforced aluminum matrix composites by additive manufacturing.

关键词： Selective laser melting TiB2 Aluminum matrix composites Mechanical properties Strengthening mechanism

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Reconfigurable manufacturing systems： Principles, design, and future trends

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Frontiers of Mechanical Engineering 2018年第2期13卷 121-136页

作者： Yoram KOREN xi gu Weihong guO Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA Department of Industrial and Systems Engineering Rutgers The State University of New Jersey Piscataway NJ 08854 USA

Reconfigurable manufacturing systems （RMSs）, which possess the advantages of both dedicated serial lines and flexible manufacturing systems, were introduced in the mid-1990s to address the challenges initiated by globalization. The principal goal of an RMS is to enhance the responsiveness of manufacturing systems to unforeseen changes in product demand. RMSs are cost- effective because they boost productivity, and increase the lifetime of the manufacturing system. Because of the many streams in which a product may be produced on an RMS, maintaining product precision in an RMS is a challenge. But the experience with RMS in the last 20 years indicates that product quality can be definitely maintained by inserting in-line inspection stations. In this paper, we formulate the design and operational principles for RMSs, and provide a state-of-the-art review of the design and operations methodologies of RMSs according to these principles. Finally, we propose future research directions, and deliberate on how recent intelligent manufacturing technologies may advance the design and operations of RMSs.

关键词： reconfigurable manufacturing systems responsiveness intelligent manufacturing

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MODIFIED BOTTLENECK-BASED PROCEDURE FOR LARGE-SCALE FLOW-SHOP SCHEDULING PROBLEMS WITH BOTTLENECK

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 356-361页

作者： ZUO Yan gu Hanyu xi Yugeng Institute of Automation Shanghai Jiaotong University Shanghai 200240 China

A new bottleneck-based heuristic for large-scale flow-shop scheduling problems with a bottleneck is proposed, which is simpler but more tailored than the shifting bottleneck （SB） procedure. In this algorithm, a schedule for the bottleneck machine is first constructed optimally and then the non-bottleneck machines are scheduled around the bottleneck schedule by some effective dispatching rules. Computational results show that the modified bottleneck-based procedure can achieve a tradeoff between solution quality and computational time comparing with SB procedure for medium-size problems. Furthermore it can obtain a good solution in quite short time for large-scale scheduling problems.

关键词： Flow-shop scheduling problem Heuristic Bottleneck machine

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Experimental investigations for parametric effects of dual synthetic jets on delaying stall of a thick airfoil

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Chinese Journal of Aeronautics 2016年第2期29卷 346-357页

作者： Zhao guoqing Zhao Qijun gu Yunsong Chen xi National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics Nanjing University of Aeronauticsand Astronautics Nanjing 210016 China College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A promising strategy of synthetic jet arrays （SJA） control for NACA0021 airfoil in preventing flow separation and delaying stall is investigated. Through aerodynamic forces, flowfield and velocity profiles measurements, it indicates that the synthetic jet （S J） could enlarge the mixing of the shear layer and then enhance the stability of boundary layer, resulting in scope reduction of the flow separation zone. Furthermore, the control effects of dual jet arrays positioned at 15%c （Actuator 1） and 40%c （Actuator 2） respectively are systematically investigated with different jet parameters, such as two typical relative phase angles and various incline angles of the jet. The jet closer to the leading edge of airfoil is more advantageous in delaying the stall of airfoil, and overall, the flow control performances of jet arrays are better than those of single actuator. At the angle of attack （AoA） just approaching and larger than the stall AoA, jet array with 180° phase difference could increase the lift coefficient more significantly and prevent flow separation. When momentum coefficient of the jet arrays is small, a larger jet angle of Actuator 2 is more effective in improving the maximum lift coefficient of airfoil. With a larger momentum coefficient of jet array, a smaller jet angle of Actuator 2 is more effective.

关键词： Active flow control Airfoil Dual synthetic jet arraysFlow separation Stall

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Acoustics Based Monitoring and Diagnostics for the Progressive Deterioration of Helical Gearboxes

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 98-109页

作者： Kaibo Lu James xi gu Hongwei Fan xiuquan Sun Bing Li Fengshou gu College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Engineering University of BoltonBolton BL35ABUK College of Mechanical Engineering Xi’an University of Science and TechnologyXi’an 710054China Centre for Efficiency and Performance Engineering University of HuddersfieldHuddersfield HD13DHUK. School of Industrial Automation Beijing Institute of TechnologyZhuhai 519088China

Gearbox condition monitoring(CM)plays a significant role in ensuring the operational reliability and efficiency of a wide range of critical industrial systems such as wind turbines and *** and timely diagnosis of gear faults will improve the maintenance of gearboxes operating under sub-optimal conditions,avoid excessive energy consumption and prevent avoidable damages to *** study focuses on developing CM for a multi-stage helical gearbox using airborne *** on signal phase alignments,Modulation Signal Bispectrum(MSB)analysis allows random noise and interrupting events in sound signals to be suppressed greatly and obtains nonlinear modulation features in association with gear *** coherence is evaluated for selecting the reliable bi-spectral peaks for indication of gear deterioration.A run-to-failure test of two industrial gearboxes was tested under various loading *** omnidirectional microphones were fixed near the gearboxes to sense acoustic information during *** has been shown that compared against vibration based CM,acoustics can perceive the responses of vibration in a larger areas and contains more comprehensive and stable information related to gear dynamics variation due to ***,the MSB magnitude peaks at the first three harmonic components of gear mesh and rotation components are demonstrated to be sufficient in characterizing the gradual deterioration of gear ***,the combining of MSB peaks with baseline normalization yields more accurate monitoring trends and diagnostics,allowing the gradual deterioration process and gear wear location to be represented more consistently.

关键词： Acoustics Modulation Signal Bispectrum Helical gearbox Gear wear

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Evolution of finite energy Airy beams in cubic-quintic atomic vapor system

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Frontiers of physics 2018年第1期13卷 143-151页

作者： Zhen-Kun Wu Hao guo Wei Wang Yu-zong gu Institute of Microsystem Physics School of Physics and Electronics Henan University Kaifeng 475004 China Key Laboratory for Physical Electronics and Devices of the Ministry of Education The School of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China

In a numerical investigation, we demonstrate the evolution of a one-dimensional and two-dimensional finite energy Airy beam in a A-type three-level atomic vapor with linear, cubic, and quintic susceptibilities considered simultaneously with the dressing effect. Quasi-solitons and soliton pairs are observed due to this competition mechanism. We find that the frequency detuning of the pump field and its power greatly affect the formation and evolution of generated solitons. In general, around the two- photon resonance point, and for low intensities of the pump field, it is less difficult to form solitons. This investigation enriches the study of the propagation properties of Airy beams and soliton generation in atomic vapor.

关键词： airy beam cubic-quintic nonlinear soliton atomic vapor system

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