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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： He, Meng Zhang, Yu Qu, Erya Chen, Yangfan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic China Eu Institute for Clean and Renewable Energy Wuhan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350307832

An integrated six-switch Buck-Boost and CLLLC cascaded converter (ISSBB-CLLLC) is proposed in this paper, which is suitable for high-voltage applications. To realize the flying capacitor voltage balance, current ripple optimization and output voltage regulation, a model of the converter is established, and a control strategy is proposed. Firstly, the balance of flying capacitor voltage in six-switch Buck-Boost circuit is analyzed, and a voltage balance control method (FCV-BCM) is proposed, which is implemented by alternatively using the redundant switching states. Next, a model of the ISSBB-CLLLC is derived and a dual closed-loop control based on phase shift control (DLC-PSC) is proposed to regulate the output voltage, which can further optimize the current ripple of inductor in six-switch Buck-Boost circuit as well. Finally, the experimental results are given to verify the effectiveness of the control strategies. © 2023 IEEE.

关键词： Buck-Boost converter

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Lifetime Performance of Pulsed Capacitors under the Combined Effect of Gamma Irradiation and High Electric Field 10

Lifetime Performance of Pulsed Capacitors under the Combined...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xiaohui, Su Hua, Li Yvcheng, Wang Qin, Zhang Chenghan, Ding Fuchang, Lin Huazhong University of Science and Technology State Key Laboratory of Strong Electromagnetic Engineering and New Technology Wuhan China

ISBN: (纸本)9789038661353

Metalized film capacitors (MFC) are widely used in many fields such as electromagnetic emission. In some irradiated operating scenarios, MFC are inevitably subjected to gamma irradiation, which affects their operational reliability. When a pulsed capacitor is discharged, the discharge circuit will oscillate due to the influence of inductance and resistance in the load. At this time, the capacitor will be affected by the reverse voltage, which seriously affects its lifetime. In this paper, the lifetime performance of metallized polypropylene film capacitors (MPPFC) under different irradiation cumulative doses from 0kGy to 1000kGy is investigated by lifetime experiments with two types of discharge reverse peak factors of 70% and 10%. The experimental results show that the lifetime of MPPFC with two kinds of discharge reverse peak factors have the tendency of increasing and then decreasing, but there is a difference in the trend of the MPPFC lifetime between the two groups of experiments. The theoretical analysis shows that the space charge effect after γ irradiation is the reason for the first increase and then decrease of the MPPFC lifetime, while the difference of the electric field distortion during the discharge process is the reason for the different trends of the MPPFC lifetime at different reverse peak factors after γ irradiation. © 2024 Eindhoven University of technology.

关键词： Gamma rays

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The impact of toroidal mode coupling on high-density discharges in J-TEXT

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Plasma Science and technology 2024年第12期26卷 1-8页

作者： Peng DENG Wenzhe MAO Zhipeng CHEN Yinan ZHOU Peng SHI Zhoujun YANG Li GAO Tao LAN Jinlin XIE Hong LI Zian WEI Adi LIU Chu ZHOU Weixing DING Wandong LIU Ge ZHUANG School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

Density limit has long been a widely studied issue influencing the operating range of *** rapid growth of the m/n=2/1(where m and n are poloidal and toroidal mode numbers,respectively)tearing mode is generally regarded as a primary precursor to the density limit *** this experiment,the coupling of the m/n=1/1 mode and the m/n=2/1 mode in highdensity plasma was *** a sawtooth cycle,the frequencies of the two modes gradually converge until they become *** that,toroidal coupling occurs between the 1/1 and 2/1 modes,resulting in a mutually fixed phase *** the occurrence of toroidal coupling,the 2/1 mode is *** to the disruption,the cessation of the 1/1 and 2/1 mode coupling,along with the rapid growth in the amplitude of the 2/1 mode,can be ***,under the same parameters,comparing discharges with or without the 1/1 mode,it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.

关键词： toroidal coupling tearing mode density limit sawtooth

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Facile construction of Mxene-supported niobium hydride nanoparticles toward reversible hydrogen storage in magnesium borohydride

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Rare Metals 2024年第9期43卷 4387-4400页

作者： Ao Xia Jia-Guang Zheng Qing-Bo Zhang Yu-Gang Shu Cheng-Guo Yan Liu-Ting Zhang Zhan-Liang Tao Li-Xin Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The facile construction of nanoscale NbH_(x)supported by Ti_(3)C_(2)(NbH_(x)@Ti_(3)C_(2))was achieved using facile ball milling strategy to improve the hydrogen desorption kinetics and reversibility of magnesium borohydride(Mg(BH_(4))_(2)).The doping of 30 wt%NbH_(x)@Ti_(3)C_(2)catalyst reduced the onset dehydrogenation temperature of Mg(BH_(4))_(2)to 71.2℃.Additionally,the Mg(BH_(4))_(2)+30NbH_(x)@Ti_(3)C_(2)composite achieved remarkable hydrogen release of over 9.2 wt%at a temperature as low as 230℃,indicating unexpected dehydrogenation ***,the reversibility of NbH_(x)@Ti_(3)C_(2)doped Mg(BH_(4))_(2)was retained to more than 4.2 wt%after four cycles,which was increased by 68%compared to that of undoped Mg(BH_(4))_(2).The strong catalysis of NbH_(x)@Ti_(3)C_(2)catalyst could be attributed to the synergistic effect of NbH_(x)and Ti_(3)C_(2)in hydrogen spillover and ***_(x)acted as a"hydrogen pump"for effective hydrogen spillover,while Ti_(3)C_(2)created numerous diffusion channels for hydrogen dissolution and provided the active catalytic site to facilitate the re/dehydrogenation of Mg(BH_(4))_(2).

关键词： Hydrogen storage Magnesium borohydride Catalysts Mxene

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Laser-upgraded coal tar for smart pavements in road and bridge monitoring applications

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Microsystems & Nanoengineering 2024年第2期10卷 231-239页

作者： Jincai Huang Man Zhang Haoyun He Qingang Li Yixin Zhao Qiulin Tan Xining Zang Department of Mechanical Engineering Tsinghua UniversityBeijing100084China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing100083China

The implementation of an intelligent road network system requires many sensors for acquiring data from roads,bridges,and vehicles,thereby enabling comprehensive monitoring and regulation of road *** this large number of required sensors,the sensors must be cost-effective,dependable,and environmentally ***,we show a laser upgrading strategy for coal tar,a low-value byproduct of coal distillation,to manufacture flexible strain-gauge sensors with maximum gauge factors of 15.20 and 254.17 for tension and compression ***,we completely designed the supporting processes of sensor placement,data acquisition,processing,wireless communication,and information decoding to demonstrate the application of our sensors in traffic and bridge vibration *** novel strategy of using lasers to upgrade coal tar for use as a sensor not only achieves the goal of turning waste into a resource but also provides an approach to satisfy large-scale application requirements for enabling intelligent road networks.

关键词： gauge bridge smart

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Bending and Vibration Analysis of Trigonometric Varying Functionally Graded Material via a Novel Third-Order Shear Deformation Theory

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Acta Mechanica Solida Sinica 2024年第6期37卷 919-931页

作者： Fei Chen Xiaofei Zhao Zhifeng Huang Jun Lei Chi Zhang Pin Wen Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration ZoneXiangyang441000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China Department of Engineering Mechanics Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China

Given the significant potential of multi-directional functionally graded materials(MFGMs)for customizable performance,it is crucial to develop versatile material models to enhance design optimization in engineering *** paper introduces a material model for an MFGM plate described by trigonometric functions,equipped with four parameters to control diverse material distributions *** bending and vibration analysis of MFGM rectangular and cutout plates is carried out utilizing isogeometric analysis,which is based on a novel third-order shear deformation theory(TSDT)to account for transverse shear *** present TSDT,founded on rigorous kinematics of displacements,is demonstrated to surpass other preceding *** is derived from an elasticity formulation,rather than relying on the hypothesis of *** effectiveness of the proposed method is verified by comparing its numerical results with those of other methods reported in the relevant *** results indicate that the structure,boundary conditions,and gradient parameters of the MFGM plate significantly influence its deflection,stress,and vibration *** the periodic parameter exceeds four,the model complexity increases,causing result ***,MFGM cutout plates,when clamped on all sides,display almost identical first four vibration frequencies.

关键词： Functionally graded material Third-order shear deformation theory Isogeometric analysis Cutout plate

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Chinese Chemical Letters 2024年第8期35卷 25-35页

作者： Yatian Deng Dao Wang Jinglan Cheng Yunkun Zhao Zongbao Li Chunyan Zang Jian Li Lichao Jia School of Materials Science and Engineering State Key Lab of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China College of Science Qiongtai Normal UniversityHaikou 571127China Kunming Sino-Platinum Metals Catalyst Co. Ltd.Kunming 650106China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and TechnologyWuhan 430074China

Catalyst with high performance has drawn increasing attention recently due to its significant advantages in chemical reactions such as speeding up the reaction,lowering the reaction temperature or pressure,and proceeding without itself being *** the superior catalytic performance of precious metal catalysts,transition metal oxides offer a promising route for substitution of precious metals in catalysis arising from their low cost,intrinsic activity and sufficient ***-type oxide SmMn_(2)O_(5) exhibits a unique crystal structure containing double crystalline fields,and nowadays is used widely as the catalyst in different chemical reactions,including the reactions of vehicle emissions reduction and oxygen evolution reaction,gas sensors,and metal-air batteries,promoting attention in catalytic perfor-mance *** our knowledge,there is no review article covering the comprehensive informa-tion of SmMn2 O 5 and its *** we review the recent progress in understanding of the crys-tal structure of SmMn_(2)O_(5) and its basic physical *** then summarize the catalytic sources of SmMn_(2)O_(5) and reaction mechanisms,while the strategies to improve catalytic performance of SmMn_(2)O_(5) are further ***,we provide a perspective on how to make further progress in catalytic applications.

关键词： Catalyst SmMn_(2)O_(5) Mullite-type oxide Catalytic oxidation Oxygen reduction reaction Oxygen evolution reaction Reaction mechanisms

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Numerical simulation of melt flow and temperature field during DC casting 2024 aluminium alloy under different casting conditions

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china Foundry 2024年第4期21卷 387-396页

作者： Jin-chuan Wang Yu-bo Zuo Qing-feng Zhu Jing Li Rui Wang Xu-dong Liu Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationShenyang 110819China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Casting speed,casting temperature and secondary cooling water flow rate are the main process parameters affecting the DC casting *** parameters significantly influence the flow and temperature fields during casting,which are crucial for the quality of the ingot and can determine the success or failure of the casting *** simulation,with the advantages of low cost,rapid execution,and visualized results,is an important method to study and optimize the DC casting *** the present work,a simulation model of DC casting 2024 aluminum alloy was established,and the reliability of the model was ***,the influence of casting parameters on flow field and temperature field was studied in detail by numerical simulation *** show that with the increase of casting speed,the melt flow becomes faster,the depths of slurry zone and mushy zone increase,and the variation of slurry zone depth is greater than that of mushy *** an increase in casting temperature,the melt flow rate increases,the depth of the slurry zone becomes shallower,and the depth of the mushy zone experiences only minor *** simulation results further indicate that the increase of the flow rate of the secondary cooling water slightly reduces the depths of both slurry and mushy zone.

关键词： aluminium DC casting flow field temperature field numerical simulation

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Efficiency Estimates of Integrated Two-Speed e-Powertrain System under WLTP Driving Cycle for Electric Vehicle 26

Efficiency Estimates of Integrated Two-Speed e-Powertrain Sy...

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26th International Conference on Electrical Machines and Systems, ICEMS 2023

作者： Feng, Shun Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798350317589

Efficiency is always one of key metrics for electric powertrain system to make the most of battery stored energy and boost electric vehicle's range. This paper presents a systematic method to estimate efficiency capability for an integrated two-speed e-Powertrain system. Overall system is modelled in MATLAB/Simulink. Inverter power, voltage and current requirements are defined from system specifications. Inverter losses, efficiencies and thermal conditions are investigated at switching frequencies of SkHz and 12kHz. With both traction motor and gearbox efficiency maps, 93.2% system peak efficiency and 90.2% Worldwide Harmonized Light Vehicle Test Procedure (WLTP) Class 3b driving cycle efficiency are obtained to verify that design targets are met in simulations. A prototype is built to validate system efficiency performance in the thermal chamber during tests. © 2023 IEEE.

关键词： Traction motors

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Modulation Strategy for Cascaded DC/DC Converter through Integration of CLLLC and Six-Switch Buck-Boost Topology

Modulation Strategy for Cascaded DC/DC Converter through Int...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Qu, Erya Zhang, Yu He, Meng Chen, Yangfan State Key Laboratory of Advanced Electromagnetic China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology WuHan China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic School of Electrical and Electronic Engineering WuHan China

ISBN: (纸本)9798350307832

This paper proposes a cascaded DC/DC converter which integrates the six-switch Buck-Boost circuit with CLLLC converter by sharing a bridge arm and shows advantages of bidirectional energy flow, high voltage rating, high efficiency and wide input voltage range. First, an alternative PWM strategy (APWM) for the six-switch Buck-Boost circuit is proposed to balance its flying capacitor voltage. Next, a control method for both current ripple optimization and power control (CRO-PC) is proposed which can reduce 73.5% of current ripple. Finally, a 2 kW/ 20 kHz prototype was built to demonstrate the performance of the proposed method. © 2023 IEEE.

关键词： Buck-Boost converter

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