检索结果-内蒙古大学图书馆

2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, Zhenyi Zhou, Zijian Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

Quadrupole magnet is an important element in the beam transport and manipulation. Permanent magnet quadrupole (PMQ) lenses appear frequently in various beamline attributed to their compact structure. In this paper, a method applicable to the fringing field transformation of a short permanent magnet quadrupole lens is proposed. The large electron beam envelope error, which occurs during the focusing process of short PMQ lenses, has been addressed. This achieved by replacing sharp cut-off fringing field with multi-rectangle cut-off fringing field. The causes of fringe field transformation errors are investigated by theoretical calculations of beam dynamics. The law of magnetic field gradient curve change of a short PMQ lens is analyzed. The scale parameters in the multi-rectangle approximation method are optimized by multi-particle tracking and finite element simulation. Applying the method to PMQ lenses of varying mechanical lengths confirms the feasibility and universality of the multi-rectangle approximation method for PMQ fringe field transformation. © 2024 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

Interaction Quantification of MTDC Systems Connected with Weak AC Grids

引用

CSEE Journal of Power and Energy Systems 2024年第5期10卷 2088-2099页

作者： Wanning Zheng Jiabing Hu Li Chai Bing Liu Zixia Sang Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China State Grid Hubei Economic Research Institute Wuhan 430077China

The small-signal stability of multi-terminal high voltage direct current(HVDC)systems has become one of the vital issues in modern power *** among voltage source converters(VSCs)have a significant impact on the stability of the *** paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general N-terminal HVDC system with a weak AC network ***,we derive the explicit formulae of self-/en-stabilizing coefficients for any N-terminal HVDC system,which can quantify the interactions through different paths *** relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability ***,we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of ***,extensive examples are given to demonstrate the effectiveness of the proposed method.

关键词： Interactions multi-terminal HVDC self-/enstabilizing coefficients small-signal stability

来源：评论

学校读者我要写书评

暂无评论

Influence of 3D helical magnetic perturbations on runaway electron generation in J-TEXT tokamak

引用

Plasma Science and technology 2025年第3期27卷 36-44页

作者： Wei YAN Guinan ZOU Zhongyong CHEN You LI Jiangang FANG Zhifang LIN Zhonghe JIANG Nengchao WANG Bo RAO Yangbo LI Zhengkang REN Chuanxu ZHAO Yu ZHONG Fanxi LIU Yinlong YU Zisen NIE Xun ZHOU Yuan SHENG Yuwei SUN Song ZHOU Xiaoqing ZHANG Zhoujun YANG Zhipeng CHEN Yonghua DING the J-TEXT Team 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 School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People’s Republic of China 不详

A large number of runaway electrons(REs)generated during disruption can cause significant damage to next-generation large-scale *** influence of three-dimensional(3D)helical magnetic perturbations on the suppression of RE generation was explored using a set of 3D helical coils in J-TEXT tokamak,which can excite m/n=-2/2 helical magnetic *** evidence shows that the-2/2 magnetic perturbations caused by the opposite coil current direct plasma toward the high-field side,simultaneously enhancing the magnetic fluctuations,which would enhance the radial loss of REs and even prevent RE *** the other hand,-2/2 magnetic perturbations can also reduce the cooling time during the disruption phase and generate a population of high-energy REs,which can interact with high-frequency magnetic fluctuations and in turn suppress RE *** critical helical coil current was found to correlate with electron density,requiring higher coil currents at higher *** to the statistical analysis of RE generation at different electron densities,the applied-2/2 magnetic perturbations can increase the magnetic fluctuations to the same level at lower electron densities,which can decrease the threshold electron density for RE *** will be beneficial for RE mitigation in future large tokamak devices.

关键词： 3D helical magnetic perturbations runaway electron J-TEXT tokamak

来源：评论

学校读者我要写书评

暂无评论

Multi-point discharge model: study on corona discharge of double-ended needle in large space

引用

Plasma Science and technology 2023年第3期25卷 62-69页

作者：李丁晨李家玮李传张明王鹏宇刘志杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Digital Grid Research Institute China Southern Power GridGuangzhou 510670People’s Republic of China The Fifth Bureau of China State Construction Engineering Corporation Changsha 410000People’s Republic of China

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However,the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter(25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.

关键词： corona discharge numerical simulation multi-point discharge large space double needle tip electrode

来源：评论

学校读者我要写书评

暂无评论

Suppression of the m/n=2/1 tearing mode by electron cyclotron resonance heating on J-TEXT

引用

Plasma Science and technology 2024年第8期26卷 8-17页

作者：方建港陈忠勇严伟王能超毛飞越罗蔷玄子健陈曦璇任正康张峰黄梅夏冬辉杨州军陈志鹏丁永华 the J-TEXT Team 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 Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Stabilization of tearing modes and neoclassical tearing modes is of great importance for tokamak *** cyclotron waves(ECWs)have been extensively used to stabilize the tearing modes with the virtue of highly localized power *** suppression of the m/n=2/1 tearing mode(TM)by electron cyclotron resonance heating(ECRH)has been achieved successfully on the J-TEXT *** effects of ECW deposition location and power amplitude on the 2/1 TM suppression have been *** is found that the suppression is more effective when the ECW power is deposited closer to the rational *** the ECW power increases to approximately 230 k W,the 2/1 TM can be completely *** island rotation frequency is increased when the island width is *** experimental results show that the local heating inside the magnetic island and the resulting temperature perturbation increase at the O-point of the island play dominant roles in TM *** the ECW power increases,the 2/1 island is suppressed to smaller island width,and the flow shear also plays a stabilizing effect on small magnetic *** the stabilizing contribution of heating and flow shear,the 2/1 TM can be completely suppressed.

关键词： tearing mode electron cyclotron resonant heating tearing mode suppression

来源：评论

学校读者我要写书评

暂无评论

Optimization Design of Coated Armature in electromagnetic Railgun Based on Multi-objective Genetic Algorithm 10

Optimization Design of Coated Armature in Electromagnetic Ra...

引用

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： Xu, Xuan Chen, Lixue Xu, Shengqin Zhang, Wenhao Zhao, Bingxuan Xiao, Tingyun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electromagnetic railgun is an advanced launch device that accelerates the armature to ultra-high speed through electromagnetic force. The contact between the armature and the two rails is a kind of ultimate sliding electrical contact beyond high pulse current, high speed, and high contact pressure. It leads to excessive local electromagnetic field distribution at the contact interface, which is not conducive to launch performance. In this paper, armatures of different coated structures are considered to improve the electromagnetic field distribution. First, the characteristic-difference scheme based on the bilinear interpolation method is presented to solve the electromagnetic governing equation of the railgun when launching armatures of different coated structures. Second, an optimization design based on NSGA-II is constructed to obtain the Pareto optimal solution set, and an optimized armature of coated structure that brilliantly meets the design objectives is selected. Finally, numerical calculations are conducted based on the optimized parameters to verify the effectiveness of the multimaterial coated armature structure. Results show that the maximum current density of the optimized armature is reduced by 54% compared to the uncoated armature, current diffusion time at the contact interface along the x-direction is shortened by 80 μs, and the penetration depth of the current along the ydirection at the armature-rail contact interface is increased by 1.6 mm, which significantly optimizes the current distribution during the launch process of the electromagnetic railgun. © 2024 Eindhoven University of technology.

关键词： Multiobjective optimization

来源：评论

学校读者我要写书评

暂无评论

Enhancing solid-state lithium metal battery performance via indium-based modification of electrolytes and lithium metal surfaces:mechanistic insights and optimization

引用

Science China Chemistry 2025年第3期68卷 1144-1158页

作者： Zhongkai Wu Chen Liu Ziling Jiang Lin Li Siwu Li Chaochao Wei Qiyue Luo Xia Chen Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China

Argyrodite-based solid-state lithium metal batteries exhibit significant potential as next-generation energy storage ***,their practical applications are constrained by the intrinsic poor stability of argyrodite towards Li metal and exposure to air/***,an indium-involved modification strategy is employed to address these *** optimized doping yields a high Li-ion conductivity of 7.5 mS cm^(-1)for Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte,accompanied by enhanced endurance against air/moisture and bare Li *** retains 92.0%of its original conductivity after exposure to air at a low dew point of-60℃in dry ***,a composite layer comprising Li-In alloy and Li F phases is generated on the surface of lithium metal anode via the reaction between InF_(3)and molten *** layer effectively mitigates Li dendrite growth by creating a physical barrier from the robust LiF phase,while the Li-In alloy induces uniform Li-ion deposition and accelerates Li transport dynamics across the interphase between the solid electrolyte/Li ***,the In-doped electrolyte facilitates the in-situ generation of Li-In alloy within its voids,reducing local current density and further inhibiting lithium dendrite ***,the combination of the Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte and the InF_(3)@Li anode provides exceptional electrochemical performances in both symmetric cells and solid-state lithium metal batteries across different operating ***,the LiNbO_(3)@LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)/Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)/InF_(3)@Li cell delivers a high discharge capacity of 167.8 mAh g^(-1)at 0.5 C under 25℃and retains 80.0%of its initial value after 400 *** work offers a viable strategy for designing functional interfaces with enhanced stability for sulfide-based solid-state lithium batteries.

关键词： Li_(5.5)PS_(4.5)Cl_(1.5)solid electrolyte In_(2)O_(3)dual-doping InF_(3)surface-modification chemical/electrochemical stability electrochemical performance

来源：评论

学校读者我要写书评

暂无评论

Influence of arc armature geometric parameters on current distribution at the armature/guideway interface 10

Influence of arc armature geometric parameters on current di...

引用

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： Chen, Lixue Zhao, Bingxuan You, Penghao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

In this paper, a parametric model of arc armature is established. And simulation models considering velocity skinning effect and pre-contact resistance are also established in this paper using COMSOL. Through this model, the effects of each parameter of the armature on the current distribution at the armature-rail interface are investigated, and by processing the results, the effects of different parameters on the current distribution at the armature-rail interface are compared. It is shown that the curvature of the arc surface, the amount of internal retraction and the length of the tailplane have the greatest influence on the current distribution at the armature-rail interface. © 2024 Eindhoven University of technology.

关键词： electromagnetic launchers

来源：评论

学校读者我要写书评

暂无评论

Launch Efficiency of Capacitive Energy-Storage electromagnetic Railgun System 10

Launch Efficiency of Capacitive Energy-Storage Electromagnet...

引用

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： Xiao, Tingyun Chen, Lixue Xu, Xuan Xu, Shengqin Zhang, Wenhao Zhao, Bingxuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

electromagnetic railgun have high initial velocity, long range and other advantages. Improving the launch efficiency is one of the most important needs for the application of electromagnetic rail launch technology. Based on the subsystem models of pulse power supply, rail and armature of railgun, the equivalent circuit mathematical model of the electromagnetic rail gun system under lumped parameters is established. The effects of capacitance, voltage, inductance, resistance and acceleration distance on the system efficiency were simulated and analyzed. The results of the study are of great significance in guiding the design of the electromagnetic launch system. © 2024 Eindhoven University of technology.

关键词： Rail guns

来源：评论

学校读者我要写书评

暂无评论

Effect of surface morphology on armature melt wear 10

Effect of surface morphology on armature melt wear

引用

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： Zhao, Bingxuan Chen, Lixue Xu, Shengqin Xu, Xuan Zhang, Wenhao Xiao, Tingyun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

Armature melting during electromagnetic launch affects the electrical contact characteristics between armature and rail, which in turn affects the launching process and the service life of the launcher. A coupled multi-physics field model considering rough surfaces is constructed. Based on this, the influence law on armature erosion characteristics is *** results show that the higher the armature surface characteristic scale factor the lower the overall armature temperature, the later the melting onset time, but the more uneven armature surface melting;the higher the surface fractal dimension the less armature melting. The results provide a reference for the optimization of armature surface processing. © 2024 Eindhoven University of technology.

关键词： Fractal dimension

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：