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Proceedings of the 2022 International Conference on Big Data, IoT, and Cloud Computing

作者： Yu Chen Feng Ma Hu Shun Huang Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science & TechnologyKey Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science & Technology China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science & Technology Precision Manufacturing Institute Wuhan University of Science and Technology China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science & Technology. Precision Manufacturing Institute Wuhan University of Science and Technology China

ISBN: (纸本)9781450399548

Abstract—While consumer credit report is used as important reference for lending institutions to make lending decisions, personal credit score is regarded as the key tool to make decisions quickly and accurately. Problems arise in the utilization of traditional clustering algorithm to deal with credit risk problem, as a large number of redundant features may cause clusters to be distributed in a certain feature subspace of high-dimensional space, and the sparse high dimensional space makes the similarity of samples difficult to measure. In order to address the issues, this paper constructs a bank credit white list access system based on the grey clustering algorithm. This paper first lists all the factors that may affect personal credit, and makes a qualitative analysis one by one, and then screens these factors. When the characteristic variables of a new applicant are known, this discriminant function is used to predict whether the applicant is a good customer, and then decide whether to grant a loan to it. Combine multiple source data into a consistent data store by using data integration technology, and then store it as a data cube; Finally, data reduction and aggregation are used, redundant features are deleted, and data is compressed to obtain effective and usable data. In this paper, the accuracy of constructing bank credit white list based on grey clustering algorithm is 92.14%. The research results show that the model is effective.

关键词： Bank credit Grey clustering white list

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Customized Heat Treatment Process Enabled Excellent Mechanical Properties in Wire Arc Additively Manufactured Mg-RE-Zn-Zr Alloys 75

Customized Heat Treatment Process Enabled Excellent Mechanic...

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75th World Foundry Congress, WFC 2024

作者： Ma, Dong Xu, Chunjie Sui, Shang School of Materials Science and Engineering Xi’an University of Technology Shaanxi Xi’an China Xi’an Shechtman Nobel Prize New Materials Institute Shaanxi Xi’an China Xi’an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Shaanxi Xi’an China

Customized heat treatment is essential for enhancing the mechanical properties of additively manufactured metallic materials, especially for the alloys with complex phase constituents and heterogenous microstructure. However, the interrelated evolutions of different microstructure features make it difficult to establish optimal heat treatment processes. Herein, we proposed a method for customized heat treatment process exploration and establishment to overcome this challenge for such kind of alloys, and a wire arc additively manufactured (WAAM) Mg-Gd-Y-Zn-Zr alloy with layered heterostructure was used for feasibility verification. Through this method, an optimal microstructure (fine grain, controllable amount of LPSO structure and nano-scale β' precipitates) and the corresponding customized heat treatment process (520 °C/30 min + 200 °C/48 h) were obtained to achieve a combination of a high strength of 364 MPa and a considerable elongation of 6.2 %, which surpassed those of other state-of-the-art WAAM-processed Mg alloys. Furthermore, we evidenced that the favorable effect of the undeformed LPSO structure on the mechanical properties was emphasized only when the nano-scale β' precipitates were present. It is believed that the findings promote the application of magnesium alloy workpieces and help to establish customized heat treatment process for additively manufactured materials. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Magnesium alloys

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Regulating Lithium Deposition via 3D Printed Current Collectors with Dual-Scale Roughness

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ACS applied materials & interfaces 2025年第23期17卷 2025 May 29页

作者： Meng Cheng Kehao Tang Zhuoyuan Yang Mingfan Zhao Wei Duan Xin Lin Kunpeng Zhu Haolin Tang Yizhou Jiang Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China. Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan 430081 China. Department of Aerospace Engineering Embry-Riddle Aeronautical University Daytona Beach Florida 32114 United States. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan 430081 China. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China.

With the growing demand for future electric vehicles, mobile devices, and wearable electronics, lithium metal has emerged as a promising anode material, offering high theoretical capacity and low density. However, uncontrolled lithium dendrite growth and significant volume changes during cycling remain major challenges. In this study, to mitigate such challenges, we present a three-dimensional (3D) current collector design of a triply periodic minimal surface structure, fabricated using selective laser melting 3D printing of copper and modified through mechanical polishing to achieve dual-scale roughness. The resulting 3D current collector features a gyroid lattice with polished top surfaces and rough inner caverns, designed to induce preferential lithium nucleation within the caverns and promote confined growth. This gyroid structure increases the surface area and improves current density distribution, leading to highly improved Li deposition uniformity and reduced dendritic growth. As expected, cells using the 3D current collectors demonstrate a low nucleation overpotential, enhanced cycling stability, and improved rate performance. The manufacturing approach and structural design can be readily extended to other metal-based batteries, providing a versatile pathway for enhancing the performance and safety of metal electrode batteries.

关键词： 3D printing current collectors dendrite suppression lithium metal anode triply periodic minimal surface

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25 Years Field Test History and Fatigue Damage Analysis for a Scrapped Ladle Crane

SSRN

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SSRN 2024年

作者： Wei, Guoqian Xu, Huan Zhao, You Dang, Zhang Lu, Zhiwen Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China

Fatigue performances of ladle cranes will gradually decrease with the increase of service years. The service history and the fatigue damage of a scrapped ladle crane were investigated and analyzed in this paper. The test history of the ladle crane was collected and concluded, and the statistical parameters of lifting capacity and the crack condition during service were determined. The last comprehensive field test before scrapping the ladle crane was introduced in detail and the damage evolution was analyzed. The geometry measurement showed that the main girders’ stiffness had changed obviously. The stress test of the crack-prone positions of the metal structure revealed their remaining bearing capacity and the damage evolution characteristics. Further analysis proved that the static stiffness of the main girder has a closer relationship with damage deterioration. Some material property inspections were carried out for samples cut from the the scrapped crane’s main girder, which were of the load-carrying part and the non-load-carrying part respectively. Results showed that the elastic modulus and hardness of the materials decreased evidently after service, while other mechanical properties did not change significantly. This study will provide useful references for further understanding of the fatigue characteristics and evolution behaviors of ladle cranes. © 2024, The Authors. All rights reserved.

关键词： Stiffness

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Internal Flow and Thermodynamic Performance Study of Straight and Screw Claw-Type Hydrogen Circulation Pump

SSRN

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SSRN 2024年

作者： Wang, Wei Yan, Di Li, Chengpeng Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China

As one of the core components of hydrogen fuel cell, the performance of the hydrogen circulation pump will directly affect its energy conversion efficiency. In this paper, a claw rotor profile is designed for hydrogen circulation pump for the first time. Firstly, the design method of the rotor profile is clarified and the meshing equations are derived, on the basis of which, the models of claw pumps with straight and screw rotors are separately established. For claw rotor profile with large curvature change, a numerical 3-D CFD model of the transient flow inside the pump is established by using cartesian cut-cell dynamic grid, and the grid independence is verified. The pressure, velocity and temperature fields are analysed in detail, and the performance characteristics including discharge pressure pulsation and volume flow pulsation during the working process of the pump are obtained. The local transient flow characteristics such as intensity and distribution of vortex, as well as the heat transfer mechanism on the rotor surface are revealed. The performance of the pumps with straight rotor and screw rotor are compared and analysed under the same initial conditions, which provides a reference for the design and optimization of high-performance hydrogen circulation pumps. © 2024, The Authors. All rights reserved.

关键词： Pumps

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Mechanical properties and deformation mechanisms of surface-modified 6H-silicon carbide

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Journal of Materials science & technology 2021年第31期90卷 58-65页

作者： Zhonghuai Wu Liangchi Zhang Laboratory for Precision and Nano Processing Technologies School of Mechanical and Manufacturing EngineeringUniversity of New South WalesNSW 2052 Australia Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics Southern University of Science and TechnologyShenzhenGuangdong 518055China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhenGuangdong 518055China

The effect of amorphous film on the deformation mechanism and mechanical properties of 6 H-SiC were systematically explored by a combination of both experiments and molecular dynamic(MD)simulations in *** experimental results showed that the plastic deformation of surface-modified6 H-SiC is mainly accommodated by dislocation activities in the subsurface and an amorphous layer with uniform *** MD results indicated that the amorphous layer on the surface of the residual indentation mark consists of both amorphous SiO_(2)and SiC due to direct *** addition,the amorphous SiO_(2)film undergoes densification and then ruptures with the indentation depth *** modulus and hardness increase with increasing the indentation depth at the initial stage but will reach their stable values equivalent to monocrystalline 6 H-SiC.

关键词： Nanoindentation Surface-modified 6H-SiC Amorphous SiO_(2)film Amorphization Dislocation evolution MD simulation

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An Effective Cooperative Coevolutionary Algorithm with Global and Local-Oriented Cooperative Mechanisms for Multi-Objective Hybrid Flowshop Lot-Streaming Scheduling with Limited and Flexible Sub-Lots

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SSRN 2024年

作者： Zhu, Yingying Tang, Qiuhua Zhang, Zikai Zhang, Liping Zhao, Lianpeng Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China

Job-splitting is a universally recognized approach to improve production efficiency, particularly in cases where the job lot size is excessively large. Flexible sub-lots that have unequal sizes and can be processed by parallel machines at each stage promote the on-time delivery of the full lot of a job. However, the tool resources in the workshop are limited, and the number of available tools strictly limits the maximum number of sub-lots. Hence, this work addresses a hybrid flowshop lot-streaming scheduling problem with limited and flexible sub-lots for simultaneous minimization of makespan and due time deviation. A mixed-integer linear programming model is formulated to identify the particular character, the coexistence of two types of time overlaps, which contributes to the simultaneous optimization of two objectives to a large extent. An effective cooperative coevolutionary algorithm with global and local-oriented cooperative mechanisms is thereafter proposed. Specifically, the semi-random initialization and heuristic decoding respectively advocates time-overlaps among sub-lots processed by parallel machines within stages and by machines at successive stages. A global-oriented cooperative mechanism, containing multipoint preservative crossover and critical machine-based crossover, is developed to enable the coevolution of two populations and enhance global convergence. A local-oriented cooperative mechanism, consisting of critical path/pair-based local search heuristics and a restart operator, is designed for deep exploitation in the complete solution space. A slope-based dichotomy is proposed to improve computational efficiency. Finally, experimental results demonstrate the effectiveness of three improvements and the superiority of the proposed algorithm. © 2024, The Authors. All rights reserved.

关键词： Multiobjective optimization

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Fabrication and characterisation of La0.8Sr0.2CrO3-ITO thermocouples for high-temperature sensing

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International Journal of Nanomanufacturing 2022年第1期18卷 1-8页

作者： Chen, Bohan Huang, Manguo Zhang, Meiju Liang, Xiaobo Liu, Dan Wang, Lingyan Niu, Gang Zhang, Zhongkai Tian, Bian Shi, Peng Ren, Wei Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric Research School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an710049 China Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing101111 China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing101111 China State Key Laboratory for Mechanical Manufacturing Systems Engineering School of Mechanical Engineering Xi’an Jiaotong University Xi’an710049 China

La0.8Sr0.2CrO3-ITO thermocouples were successfully fabricated by screen printing. The La0.8Sr0.2CrO3 powder used for screen printing was obtained by the sol-gel method. The highest thermal voltage output was maintained at 270 mV at 1270°C. The microstructure of La0.8Sr0.2CrO3 and ITO electrode films were analysed by SEM. Thermoelectric response test was implemented to measure the performance of La0.8Sr0.2CrO3-ITO thermocouple by three times of thermal cycles. The results indicated that La0.8Sr0.2CrO3-ITO thermocouple showed good stability at high temperature. Copyright © 2022 Inderscience Enterprises Ltd.

关键词： Screen printing

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Design and Numerical Modelling of a New Rotor Profile for Claw Screw Pump

SSRN

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SSRN 2024年

作者： Li, Chengpeng Yan, Di Zhu, Jianyang Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Wuhan430081 China Precision Manufacturing Institute Wuhan University of Science and Technology Wuhan430081 China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Wuhan430081 China

The rotor profile design determines the mechanical properties and flow field characteristics of screw pump. This paper proposed a new rotor profile which is composed of six cycloids, two involutes and four arcs, and the design method is derived. The geometric evolution of the new profile is demonstrated. The relationship between design parameters and area utilization rate is quantified. FEM method is employed for analyzing the mechanical properties of the rotors, while CFD modelling based on dynamic grid method is utilized to simulate the internal three-dimensional transient flow field. A comparative analysis is conducted on both the mechanical properties and flow field characteristics between the new and the traditional claw screw pump. The results show that the new profile reduces the processing difficulty of the rotors due to simpler geometry, the fluid pressure deformation of the rotor is reduced by 7.75% compared with the traditional profile, the contact deformation is reduced by 5.18% while the vacuum degree is increased by 0.0061MPa. The accuracy of the numerical modelling is analyzed and verified by a case study of a piston pump. The new rotor is superior to the traditional claw rotor in terms of geometric simplicity, mechanical property and vacuum degree. © 2024, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Combination of eddy current and heat treatment for crack healing and mechanical-property improvement in magnesium alloy tube

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Journal of Magnesium and Alloys 2021年第5期9卷 1788-1801页

作者： Wenchen Xu Chuan Yang Haiping Yu Xueze Jin Guojing Yang Debin Shan Bin Guo School of Materials Science and Engineering&National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyangSichuan621900China

The continuous eddy current pulse treatment(ECPT)combined with heat treatment was employed to heal the microcracks in spin formed Mg alloy tubes and improve their mechanical properties in this *** results show that all the microcracks in different tube specimens were almost healed after different continuous ECPT schemes up to 15 *** schemes with less cooling intervals exhibited better healing effect and increased the strength and elongation of Mg alloy tubes more *** aging treatment,the strength improvement of the specimens with ECPT was more remarkable than that of the specimens without ECPT,and the elongation decrease of the specimens with ECPT was less evident than that of specimens without ECPT due to the segregation of RE elements on the crack ***,after solution treatment,the strength reduction and ductility improvement of the specimens with ECPT were more pronounced than that of the specimens without ECPT owing to the notable decrease of dislocation density of the specimens with *** narrowed cracks induced by ECPT and the segregation of precipitates in the vicinity of microcrack surface during aging treatment contributed to the maximum strength in the as-spun specimens with ECPT followed by aging treatment.

关键词： Microcrack Healing Eddy current pulse treatment Heat treatment

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