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Journal of Central South University 2024年第5期31卷 1398-1411页

作者：吴靓李月陈锦微张汭张乾坤肖逸锋 School of Mechanical engineering and Mechanics Xiangtan UniversityXiangtan 411105China Key Laboratory of welding Robot and Application Technology of hunan province Xiangtan 411105China welding automation equipment engineering research center of hunan province Xiangtan 411105China

为了解决钎焊接头中脆性化合物的形成问题,我们设计了一种创新性的稀土改性还原氧化石墨烯增强AgCuTi复合钎料,进而获得了以Ag-Cu共晶为主要组织且脆性化合物生成量合适的钎焊接头。对比分析了有无稀土Ce改性的复合钎料的成分和显微组织... 详细信息

为了解决钎焊接头中脆性化合物的形成问题,我们设计了一种创新性的稀土改性还原氧化石墨烯增强AgCuTi复合钎料,进而获得了以Ag-Cu共晶为主要组织且脆性化合物生成量合适的钎焊接头。对比分析了有无稀土Ce改性的复合钎料的成分和显微组织,结果表明,经Ce改性后的还原氧化石墨烯在钎料中更加均匀分散。比较了分别采用有无Ce改性的钎料钎焊C/C复合材料-C/C复合材料接头的界面微观结构,并研究了石墨烯含量对接头组织和性能的影响。结果表明,由于经Ce改性的钎料中的还原氧化石墨烯分散性更好,从而细化了焊缝组织,且物相分布更均匀,使得接头的剪切强度明显提高。当石墨烯含量为0.5 wt.%时,使用Ce改性的钎料所得钎焊接头的平均剪切强度最高,为31.82 MPa,提高了50%。

关键词：稀土改性还原氧化石墨烯复合钎料 C/C复合材料钎焊

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A Novel Transformer Winding Design Strategy for Efficiency Improvement and Harmonic Suppression in Industrial Power System

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Protection and Control of Modern Power Systems 2024年第6期9卷 30-41页

作者： Qianyi Liu Fang Liu Yi Yang Yanjian Peng Kang-Zhi Liu Ao Wang the School of automation Central South UniversityChangsha 410083China the College of Electrical and Information engineering Hunan UniversityChangsha 410082China the Department of Electrical and Electronic engineering Chiba UniversityChiba 263-8522Japan Jiangsu province engineering research center of High-level Energy and Power equipment Changzhou UniversityChangzhou 213164China

Large-power industrial power supply system is generally recognized as high energy-consuming,while the rectifier transformer is the key for efficiency *** article proposes a novel transformer winding design strategy with the aims of harmonic elimination and loss *** means of the innovative impedance matching design,the harmonic magnetic potential self-balance between the secondary windings is realized for harmonic *** the impedance constraint and the margin of structural parameters,the method of resistance loss reduction is explored for the proposed transformer by optimizing the dimension *** transformer-filter combination is first modeled to reveal the filtering principle and obtain the impedance ***,the transformer efficiency is optimized within the *** last,the transformer prototype together with the power supply system is *** experimental results show that the transformer efficiency can be improved by 0.81%,and the current total harmonic distortion at primary side is dropped by 50%.

关键词： Power quality industrial power system rectifier transformer efficiency improvement.

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A review of welding simulation methods for large components

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Progress in Natural Science:Materials International 2023年第5期33卷 551-568页

作者： Shuai Liu Zhiqiang Wu Wenhao Zhou Honggang Zhou Keke Zhang Danqing Yin Yongping Lei Yongfeng Qiu engineering research center of Mining Development Technology and equipment for Deep Sea and Earth Ministry of Education Hunan University of Science and Technology hunan Valin Xiangtan Iron & Steel Group Co. Ltd research Institute of Technology Jianglu Electromechanical Science & Technology Co. Ltd.Xiangtan School of Materials Science and engineering Henan University of Science and Technology School of Materials Science and engineering Beijing University of Technology Guiyang Aluminum Magnesium Design & research Institute Co. Ltd

The challenges posed by cross-scale effects, large computational requirements, high nonlinearity, and complex interactions of multiple physical phenomena constitute major obstacles to the effectiveness and accuracy of welding simulations for large structural components. Therefore, achieving accurate welding simulation to predict and effectively control welding deformation of substantial engineering structural parts is essential to ensure welding quality and improve production efficiency. This paper reviews the current research status of welding numerical simulation of large engineering components, including the establishment of the finite element model,optimization of the heat source model, selection of appropriate finite element calculation method, and the control of welding deformation through optimization algorithm. In addition, the strategies to improve the precision and efficiency of welding numerical simulation and control welding deformation of engineering components are analyzed and discussed. The future development of welding numerical simulation will focus on balancing simulation accuracy and simulation efficiency and optimizing welding parameters to control welding deformation efficiently.

关键词： Large welded components Algorithm optimization welding deformation Simulation accuracy and efficiency

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Linearization threshold condition and stability analysis of a stochastic dynamic model of one-machine infinite-bus (OMIB) power systems

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Protection and Control of Modern Power Systems 2021年第1期6卷 242-252页

作者： Lijuan Li Yongdong Chen Bin Zhou Hongliang Liu Yongfei Liu College of automation and Electronic Information Hunan Engineering Research Center of Multi energy Cooperative Control TechnologyXiangtan UniversityXiangtan411105China College of automation and Electronic Information Xiangtan UniversityXiangtan411105China College of Electrical and Information engineering Hunan UniversityChangsha410082China College of Mathematics and Computational Science Xiangtan UniversityXiangtan411105China State Grid Jiangsu Electric Power Co.Electric Power research Institute Nanjing210000China

With the increase in the proportion of multiple renewable energy sources, power electronics equipment and new loads, power systems are gradually evolving towards the integration of multi-energy, multi-network and multi-subject affected by more stochastic excitation with greater intensity. There is a problem of establishing an effective stochastic dynamic model and algorithm under different stochastic excitation intensities. A Milstein-Euler predictor-corrector method for a nonlinear and linearized stochastic dynamic model of a power system is constructed to numerically discretize the models. The optimal threshold model of stochastic excitation intensity for linearizing the nonlinear stochastic dynamic model is proposed to obtain the corresponding linearization threshold condition. The simulation results of one-machine infinite-bus (OMIB) systems show the correctness and rationality of the predictor-corrector method and the linearization threshold condition for the power system stochastic dynamic model. This study provides a reference for stochastic modelling and efficient simulation of power systems with multiple stochastic excitations and has important application value for stability judgment and security evaluation.

关键词： Power system stability Stochastic dynamic model Stochastic excitation Stochastic processes Threshold condition

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Message from Editors

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CES Transactions on Electrical Machines and Systems 2021年第4期5卷 271-272页

作者： Ronghai Qu Shoudao Huang Jianxin Shen Fengge Zhang Xiuhe Wang Metin Aydin Xiaoyong Zhu Yongxiang Xu Zhuoran Zhang Gaolin Wang Pinjia Zhang Hong Li Dawei Li academic degrees committee State and province Joint engineering research center of Novel Electrical Machines center for Advanced Electrical Machines and Drives(CAEMD) State Key Laboratory of Advanced Electromagnetic engineering and Technology hunan University China Zhejiang University China Shenyang University of Technology China Shandong University China Kocaeli University Turkey Jiangsu University China Harbin Institute of Technology China Nanjing University of Aeronautics and Astronautics China Tsinghua University China Huazhong University of Science and Technology China

IN recent years,4th Industrial Revolution and Industry 4.0 have swept the world and deeply influenced the development of global industry *** movement arises wide attention to electric motor drive system which is playing an increasing important role in energy consumption transformation and environment *** this tremendous change in industry field,the concept of high-efficient,energy-saving and intelligent motor system has been *** one hand,motor system with advantages such as low vibration,low noise,weak magnetic interference,renewable utilization capacity,high-efficiency and high-reliability could promote the progress of major industries such as mining,renewable energy and cutting-edged equipment *** the other hand,the realization of intelligent and automated operations of motor drive system would help boosting the automation of industrial production.

关键词： operations realization boosting

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