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Determination of Optimal Deformation Temperature and Deformation Mechanism of Thermal Effect in electromagnetic Forming Based on a New Multi-Sized Workpiece Method

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SSRN 2022年

作者： Dong, Pengxin Wu, Jiawei Cao, Quanliang Chen, Qi Han, Xiaotao Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

electromagnetic forming (EMF) is a promising and rapidly developing high-speed forming technique of lightweight materials. However, there is currently a lack of accurate analysis of the thermal effect of eddy current induced in workpieces and the influence of deformation temperature on formability. In this work, a multi-sized workpiece method was proposed for electromagnetic ring expansion tests, and one-dimensional uniaxial high-speed tensile tests of 5083 Aluminum alloy (AA5083) rings with varying temperatures and the same velocity were conducted to analyze the influence of thermal effect on deformation behavior. It was found that the fracture strain first increased and then decreased with increasing temperature, and the maximum fracture strain reached 30.8%. It can be concluded that the optimal deformation temperature range of AA5083 in EMF was 161-199℃. The deformation texture and microstructure evolution were investigated using electron back-scattered diffraction. The results indicated that the temperature within the optimal deformation temperature range promoted the occurrence of dynamic recovery, which was the main reason for the enhanced ductility of AA5083 in EMF. The process was gradually replaced by dynamic recrystallization as the temperature increased, which decreased the ductility. Determination of optimal deformation temperature in EMF can further improve the formability of AA5083, and the study of the thermal effect caused by eddy current is instructive for the development and application of EMF. © 2022, The Authors. All rights reserved.

关键词： Tensile testing

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Influence of Corona Space Charge on Subsequent Streamer Inception from Horizontal Conductors during Lightning Attachment Process

Influence of Corona Space Charge on Subsequent Streamer Ince...

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advanced Electrical Equipment and Reliable Operation (AEERO), International Conference on

作者： Qiaobo Xiong Yawei Wang Qing Liu Chunqing Xiang Dezhi Xia Laboratory of Low frequency Electromagnetic Communication Technology with the 722 Research Institute CSSC Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665402651

the space charge generate by the corona discharge near the UHVDC overhead transmission lines can distort the electric field distribution under thunderstorms. this paper presents a numerical model to estimate the corona space charge produced by horizontal conductors in response the electric field generated by both thundercloud and downward leader. Secondly, the corona space charge development process from ground conductors was obtained. The transition process of corona discharge to subsequent streamer is analyzed. the inhibition effect of the space charge layer on the subsequent streamer initiation was calculated by considering different conductor diameters. It is concluded that there is an optimal diameter for horizontal conductors which can ensure a superior capability to launch subsequent streamers, which should achieve a corona-free condition under the electric field of thundercloud.

关键词： Surface waves Surface discharges Lightning Space charge Fault location Conductors Corona

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Turning a hot spot into a cold spot:polarization-controlled Fano-shaped local-field responses probed by a quantum dot

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Light(Science & Applications) 2020年第1期9卷 417-428页

作者： Juan Xia Jianwei Tang Fanglin Bao Yongcheng Sun Maodong Fang Guanjun Cao Julian Evans Sailing He Centre for Optical and Electromagnetic Research State Key Laboratory of Modern Optical InstrumentationNational Engineering Research Center for Optical InstrumentationJORCEPCollege of Optical Science and EngineeringZhejiang University310058 HangzhouChina School of Physics Huazhong University of Science and Technology430074 WuhanChina Centre for Optical and Electromagnetic Research ZJU-SCNU Joint Center of PhotonicsSouth China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouChina Department of Electromagnetic Engineering School of Electrical EngineeringRoyal Institute of TechnologyS-10044 StockholmSweden

Optical nanoantennas can convert propagating light to local *** local-field responses can be engineered to exhibit nontrivial features in spatial,spectral and temporal domains,where local-field interferences play a key ***,we design nearly fully controllable local-field interferences in the nanogap of a nanoantenna,and experimentally demonstrate that in the nanogap,the spectral dispersion of the local-field response can exhibit tuneable Fano lineshapes with nearly vanishing Fano dips.A single quantum dot is precisely positioned in the nanogap to probe the spectral dispersions of the local-field *** controlling the excitation polarization,the asymmetry parameter q of the probed Fano lineshapes can be tuned from negative to positive values,and correspondingly,the Fano dips can be tuned across a broad spectral ***,at the Fano dips,the local-field intensity is strongly suppressed by up to ~50-fold,implying that the hot spot in the nanogap can be turned into a cold *** results may inspire diverse designs of local-field responses with novel spatial distributions,spectral dispersions and temporal dynamics,and expand the available toolbox for nanoscopy,spectroscopy,nano-optical quantum control and nanolithography.

关键词： quantum local dispersion

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New Automatic Reclosing Scheme on Substation Lines for Renewable Energy Source Access

New Automatic Reclosing Scheme on Substation Lines for Renew...

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Power and Energy engineering (ICPEE), International Conference on

作者： Qiu Yutao Qian Zhengxu Pan Wulue Wang Song Xu Feng Zhang Zanzan Wen Minghao State Grid Zhejiang Power Dispatching Control Center Hangzhou China State Grid Zhejiang Electric Power Co. Ltd. Research Institute Hangzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

In order to avoid the adverse effects of the access of renewable energy sources on automatic reclosing, reclosing is usually done by cutting out renewable energy power supply after the fault occurs and extending the reclosing setting time. But this will lead to the interruption of power supply to a large number of local loads, which is not conducive to the efficient use of renewable energy sources. In this paper, a new reclosing method for substation lines with inverter-type renewable energy source access is proposed. This method can keep the inverter-type renewable energy source running continuously during reclosing, and ensure the continuity of power supply of important loads. Firstly, it is pointed out that the control strategy of renewable energy source must be switched during reclosing, to make it have the basic island operation capability. Then, to maintain the power balance between renewable energy source and load, the method of using load shedding cooperating with unloading resistors during reclosing is proposed. Finally, the reclosing operation will be performed when the synchronization conditions are met. And simulation under different working conditions is carried out on PSCAD/EMTDC platform, which verified the feasibility of the proposed reclosing strategy.

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Characterization of the High Graded Magnetic Material based Linear Generator for Wave Energy Conversion 13

Characterization of the High Graded Magnetic Material based ...

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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Molla, Selim Farrok, Omar Islam, Md. Rabiul Xu, Wei Department of Electrical and Electronic Engineering Ahsanullah University of Science and Technology Dhaka1208 Bangladesh School of Elect. Comput. and Telecommun. Eng. University of Wollongong WollongongNSW2522 Australia State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728172101

Characterization of a permanent magnet linear generator (PMLG) for harvesting oceanic wave energy is presented in this paper. For the characterization, a PMLG has been designed which has a translator containing permanent magnet and vertically symmetric stator. Different high graded magnetic materials are applied to the PMLG to generate high amount of electrical power. As a part of characterization, load profile is analyzed to determine its peak generated power for each of the magnetic materials. Comparison of generated voltage, generated voltage, load current, output power, and magnetic flux linkage of the PMLG are presented in detail. Translator force and velocity are determined to calculate the efficiency of the PMLG. The analysis is performed with finite element method by using ANSYS/Maxwell software. Armature reaction, demagnetization, and core loss that occurs in the PMLG are considered for the analysis. © 2021 IEEE

关键词： Permanent magnets

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Finite-Set Model Predictive Current-Control in Field Weakening Region for Linear Induction Machines

Finite-Set Model Predictive Current-Control in Field Weakeni...

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Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Mahmoud F. Elmorshedy Wei Xu Faculty of Engineering Tanta University Egypt State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781665425582

The main purpose for the execution of this strategy is to control the linear induction machines (LIMs) over the rated linear speed. This is developed by one field weakening by finite-set model predictive current control (FW-FSMPCC). The reference values of Id and Iq are continuously adapted as a function to control the speed. This enhances the drive capability where the machine can work under both rated speed and over rated speed. The maximum current and voltage are taken into consideration to keep the machine working with safe operation. Only the primary currents are used in the optimized cost function and therefore no weighting factor is needed like the thrust control. The primary current errors would occur in αβ-coordinates, which is estimated by considering the absolute value of subtraction of primary reference current from the predicted primary current. The end-effect phenomenon is also taken under consideration for the design process of the suggested control method and for dynamic model of the LIM. All theoretical analysis has been validated by comprehensive simulation results based on parameters of one arc induction machine with estimated power 3 kW and large radius.

关键词： Current control Adaptation models Simulation Conferences Predictive models Cost function Power electronics

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Heterogeneously integrated quantum-dot emitters efficiently driven by a quasi-BIC-supporting dielectric nanoresonator

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Photonics Research 2022年第8期10卷 1971-1977页

作者： LI LIU RUXUE WANG XUYI ZHAO WENFU YU YI JIN QIAN GONG AIMIN WU State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Terahertz Solid State Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Centre for Optical and Electromagnetic Research and International Research Center for Advanced Photonics College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

Bound states in the continuum(BICs) can make subwavelength dielectric resonators sustain low radiation leakage, paving a new way to minimize the device size, enhance photoluminescence, and even realize lasing. Here, we present a quasi-BIC-supporting Ga As nanodisk with embedded In As quantum dots as a compact bright on-chip light source, which is realized by heterogeneous integration, avoiding complex multilayered construction and subsequent mismatch and defects. The emitters are grown inside the nanodisk to match the mode field distribution to form strong light–matter interaction. One fabricated sample demonstrates a photoluminescence peak sustaining a quality factor up to 68 enhanced by the quasi-BIC, and the emitting effect can be further promoted by improving the epilayer quality and optimizing the layer-transferring process in the fabrication. This work provides a promising solution to building an ultracompact optical source to be integrated on a silicon photonic chip for high-density integration.

关键词： emitter resonator dielectric

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Comparative Analysis of Bilateral Permanent Magnet Linear Synchronous Motors With Different Structures

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CES Transactions on Electrical Machines and Systems 2020年第2期4卷 142-150页

作者： Fengrui Cui Zhaolong Sun Wei Xu Weichang Zhou Yi Liu School of Naval University of Engineering Wuhan430000China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan430074China

Permanent magnet linear synchronous motor(PMLSM)has the advantages of high thrust density and good control accuracy,which can be applied in high-power and high-speed *** this paper,the analytical models are established to obtain the electromagnetic performance for the PMLSMs with dual secondaries and dual *** air-gap flux density and the electromagnetic thrust are also obtained by the finite element model to verify theoretical ***,an improved structure is also put forward in order to suppress the thrust fluctuation of the ***,the advantages and disadvantages of two PMLSMs topologies are *** analyses would provide a guide for the design of PMLSMs applied in high-power and high-speed occasions.

关键词： Bilateral permanent magnet linear synchronous motor(BPMLSM) analytical method finite element algorithm(FEA) electromagnetic performance.

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Sc-Doping in Na3zr2si2po12 Electrolytes Enable Preeminent Performance of Solid-State Sodium Batteries in a Wide Temperature Range

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SSRN 2022年

作者： Wang, Qiao Yu, Chuang Li, Liping Liu, Xiaoqing Zhang, Xin Gao, Guichen Wang, Yaowen Li, Guangshe State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun130012 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430000 China

Solid-state sodium batteries (SSSBs) display great potential in scale energy storage for their safety, cost and sustainability. However, it is a great challenge to achieve high ionic conductivity and temperature adaptability for most sodium-ion solid electrolytes. Here, we demonstrate that Sc 3+ -doped Na 3 Zr 2 Si 2 PO 12 (NASICON) is a promising electrolyte for a wide temperature range utilizing in SSSBs from 0 to 50 °C. Optimal Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 shows a superior Na-ion conductivity, up to 1.77×10 -3 S cm -1 at room temperature, and excellent Na metal compatibility, as confirmed by symmetrical cell test. Furthermore, the solid-state sodium battery with the configuration of Na 3 V 2 (PO 4 ) 3 /Na 3.4 Zr 1.6 Sc 0.4 Si 2 PO 12 /Na maintains a discharge capacity of 98.7 mAh g -1 at 1C after 300 cycles at room temperature. Even at 0 °C, the battery still displays a reversible capacity of 99.2 mAh g -1 at 0.1C after 100 cycles. Through the structure analysis and ex-situ and in-situ characterizations, the reasons that dominate the excellent performance of the assembled all-solid-state sodium battery with NASICON electrolytes is revealed. © 2022, The Authors. All rights reserved.

关键词： Solid electrolytes

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electromagnetic Design and Optimization of 13 T Split Superconducting Magnet for Neutron Scattering

Electromagnetic Design and Optimization of 13 T Split Superc...

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2020 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2020

作者： Zhu, Sihua Tan, Yunfei University of Science and Technology of China Hefei China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728152158

Neutron scattering is one of the most exceptional experimental techniques used to investigate the structure and dynamics of condensed matter at the atomic scale. Neutron scattering magnet system provide high magnetic field sample environment as an ideal tool platform for science research. A hybrid optimization approach including four steps for the neutron scattering superconducting magnet design is introduced in the paper. The method adopted fourth-order solenoid ideal model for magnetic field calculation, and adopted linear programming to obtain initial ideal parameters of superconducting coils. After checking viability, a practical design for neutron scattering superconducting magnet has been obtained. The magnet employs seven split coils winded on five pairs bobbins, the inner diameter of coil is 70.4 mm and outer diameter is 397.8 mm, the total length of coils is 380 mm. The central field of superconducting magnet is 13 T when the magnet is charged to the maximum operating current of 114.13 A. The magnetic field and stress are calculated and simulated by finite element software, the inhomogeneity of sample volume is less than 0.231% over a 10 mm×10 mm volume. All of the magnet specification satisfied the design requirements. © 2020 IEEE.

关键词： Linear programming

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