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Elastic properties of Cu–6wt% Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

Chinese Physics B 2025年第2期34卷 90-95页

作者： Ziyu Li Tianyi Gu Wenqi Wei Yang Yuan Zhuo Wang Kangjian Luo Yupeng Pan Jianfeng Xie Shaozhe Zhang Tao Peng Lin Liu Qi Chen Xiaotao Han Yongkang Luo Liang Li Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China

Conductor materials with good mechanical performance as well as high electrical and thermal conductivities are particularly important to break through the current bottle-neck limit(~ 100 T) of pulsed magnets. Here, we perform systematic studies on the elastic properties of the Cu–6wt% Ag alloy wire, which is a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques, i.e., resonant ultrasound spectroscopy(RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu–6wt% Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this opportunity to test the availability of our newly-built ultrasound pulse-echo facility at the Wuhan National High Magnetic Field Center(WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu–6wt% Ag alloy wire remains excellent without anomalous softening under extreme conditions,e.g., in ultra-high magnetic field up to 50 T and nitrogen or helium cryogenic liquids.

关键词： high-field magnet Cu–Ag alloy ultrasonic techniques elastic constants

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Multi-Objective Optimization of electromagneticthermal Coupling Performance for High-torquedensity PMSM based on Multi-dimensional Correction Techniques

Multi-Objective Optimization of Electromagneticthermal Coupl...

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2024 International Conference on Electrical Machines, ICEM 2024

作者： Li, Zequan Wang, Jin Sun, Lu Kang, Haoyu Liu, Liyang Zhou, Libing State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Guangzhou China Guangzhou511453 China

ISBN: (纸本)9798350370607

To address the precision limitation of traditional thermal models and the computational inefficiency of electromagnetic-thermal coupling finite element models, this work proposes a multidimensional correction-based electromagnetic-thermal coupling design optimization method for electric machines. Firstly, this method corrects the sensitive parameters in the analytical lumped parameters thermal network model (LPNM) based on prior information from historical experimental data to ensure the accuracy for thermal performance analysis. Subsequently, to enhance computational efficiency, a large number of low-fidelity (LF) samples are obtained using the corrected thermal model in a serial electromagnetic-thermal field calculation manner, complemented by a small number of high-fidelity (HF) samples obtained from the electromagnetic-thermal coupling simulation model. Then, by employing a transfer learning technique, the data information from the low- to high-fidelity sample sets is comprehensively utilized to train a multi-fidelity (MF) surrogate model for the final optimization. The proposed method applied to a high-torque-density aerospace propulsion permanent magnet synchronous motor (PMSM) with short-term strong overload capability, it not only significantly improves the accuracy of LPNM, but also reduces the training sample acquisition time by over 50% under the same model accuracy. Finally, a prototype is tested to validate the effectiveness of the proposed method. © 2024 IEEE.

关键词： Lumped parameter networks

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First spectroscopic study of HFRC plasma

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Plasma Science and technology 2024年第8期26卷 18-24页

作者：毛安程芝峰饶波杨菁珉张明 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic TechnologyWuhan 430074People’s Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China

An advanced spectral diagnostic system was developed to measure the electron temperature(T_(e)),electron density(N_(e)),and ion temperature(T_(i))of the Huazhong University of Science and technology field-reversed configuration *** system consists of an optic fiber spectrometer with a wide spectral band and a 670 mm focal length high throughout Czerny-Turner monochromator equipped with both a 3600 g mm^(-1)grating and a 2400 g mm^(-1)grating to measure the line *** these components is an electronmultiplying charge-coupled device camera to capture spectral *** relative intensity of the optical fiber spectrometer was calibrated using a standard luminance source,and the wavelength calibration of the spectrometer was accomplished using a Hg/Ar *** diagnostic setup was configured to measure electron density based on the Stark effect of H_γ(n=5→n=2;434.04 nm).Doppler broadening of an OⅢ(2s^(2)2p(^(2)P^(0))3p→2s^(2)2p(^(2)P^(0))3s;375.988 nm)emission line was measured and analyzed to obtain the ion temperature,and electron temperatures were estimated from the relative strength of H_(β)(n=4→n=2;486.14 nm)(D_(β))and H_(γ)(D_(γ))spectral lines when the electron density was obtained from Stark effect *** initial experimental results indicate that the highest electron temperature of the formation region was approximately 8 eV,the electron density of the colliding-and-merging region was approaching 10^(20)m^(-3),and the ion temperature reached about 40 eV.

关键词： Stark effect Doppler effect ion temperature electron density electron temperature

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Numerical study of current density on armature and rail interface with dynamic contact 10

Numerical study of current density on armature and rail inte...

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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： Xu, Jinghan Xia, Shengguo Chen, Lixue Huazhong University of Science and Technology Key Laboratory of Pulsed Power Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electrical contact between the armature and rail is acknowledged as an imperfect electrical contact (ImPEC), exhibiting properties distinct from the bulk. It is necessary to understand the current distribution for future structure design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. The contact pressure and area vary with the input current, sharing similar trends, which show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current is re-distributed with the contact area, which is concluded as forced shifts of current caused by dynamic contact. © 2024 Eindhoven University of technology.

关键词： Digital elevation model

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Variable dead zone pulse width modulation to reduce conducted electromagnetic interference 2

Variable dead zone pulse width modulation to reduce conducte...

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2nd China Power Supply Society electromagnetic Compatibility Conference, CPEMC 2024

作者： Liu, Hui Jiang, Dong Yan, She State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331509552

—The switching of the switch will produce a lot of electromagnetic interference (EMI). The time scale of the dead zone is very small, and the actual conduction situation is determined by the direction of the current, and therefore affects the EMI at the MHz level. Based on the principle of spread spectrum modulation, a pulse width modulation (PWM) technique with variable dead zone (VDZ) is proposed in this paper. The simulation and experimental results show that the differential mode EMI can be reduced by about 5dB at 600kHz-5MHz by using VDZPWM at a constant switching frequency. ©2024 IEEE.

关键词： Pulse width modulation

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Shape-position perceptive fusion electronic skin with autonomous learning for gesture interaction

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Microsystems & Nanoengineering 2024年第4期10卷 225-238页

作者： Qian Wang Mingming Li Pingping Guo Liang Gao Ling Weng Wenmei Huang State Key Laboratory of Reliability and Intelligence of Electrical Equipment TianjinChina Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province School of Electrical EngineeringHebei University of TechnologyTianjin 300130China

Wearable devices,such as data gloves and electronic skins,can perceive human instructions,behaviors and even emotions by tracking a hand's motion,with the help of knowledge *** shape or position single-mode sensor in such devices often lacks comprehensive information to perceive interactive ***,the limited computing power of wearable applications restricts the multimode fusion of different sensing data and the deployment of deep learning *** propose a perceptive fusion electronic skin(PFES)with a bioinspired hierarchical structure that utilizes the magnetization state of a magnetostrictive alloy film to be sensitive to external strain or magnetic *** at the joints of a hand,the PFES realizes perception of curvature(joint shape)and magnetism(joint position)information by mapping corresponding signals to the two-directional continuous distribution such that the two edges represent the contributions of curvature radius and magnetic field,*** autonomously selecting knowledge closer to the user's hand movement characteristics,the reinforced knowledge distillation method is developed to learn and compress a teacher model for rapid deployment on wearable *** PFES integrating the autonomous learning algorithm can fuse curvature-magnetism dual information,ultimately achieving human machine interaction with gesture recognition and haptic feedback for cross-space perception and manipulation.

关键词： alloy electronic interaction

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Characterization of on-state resistance of electrically triggered vacuum surface flashover switch 4

Characterization of on-state resistance of electrically trig...

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4th International Conference on Electrical engineering and Control Science, IC2ECS 2024

作者： Fu, Yingjie Dong, Luokang He, Mengbing Liu, Zhengzheng Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9798331510107

Electrically triggered Vacuum Surface Flashover Switches (VSFS) are suitable for high voltage and high power conversion applications because of their advantages of high turn-on speed, high insulation recovery speed, small size, and simple structure. Low on-state resistance, which determines the output efficiency of the pulsed power system and its own lifetime, is an important index of high-performance VSFS. In this paper, the variation rule of the on-state resistance of VSFS under square wave current condition and exponential decay current condition and the influencing factors are investigated by experiment. The experimental results show that in the on-state stage, the operating voltage has a greater effect on the VSFS on-state resistance, and the trigger energy have a smaller effect on the VSFS on-state resistance. © 2024 IEEE.

关键词： Flashover

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Power-to-Hydrogen by Electrolysis in Carbon Neutrality: technology Overview and Future Development

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1266-1283页

作者： Zhiyao Zhong Jiakun Fang Kewei Hu Danji Huang Xiaomeng Ai Xiaobo Yang Jinyu Wen Yuan Pan Shijie Cheng the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China. Hitachi Energy Research Hitachi Energy(China)LimitedBeijing 100015China.

Power-to-hydrogen by electrolysis(PtHE)is a promising technology in the carbon-neutral evolution of *** not only contributes to renewable energy integration but also accelerates decarbonization in industrial sectors through green hydrogen *** paper presents a comprehensive review of PtHE ***,technical solutions in PtHE technology are introduced to clarify pros and cons of one ***,the multiphysics coupling and the multi-energy flow are investigated to reveal the insight mechanism during operation of compactly assembled industrial PtHE ***,the development trends of core components in PtHE plants,including electrocatalysts,electrode plates and operation strategy,are reviewed,*** thrusts needed for PtHE in carbon-neutral transition are also ***,three configurations of the PtHE plant in energy system integration are introduced,which can achieve renewable energy integration and efficient energy *** Terms-Carbon neutrality,power-to-hydrogen nby electrolysis(PtHE),multiphysics coupling,multidisciplinary.

关键词： Carbon neutrality power-to-hydrogennby electrolysis(PtHE) multiphysics coupling multidisciplinary.

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A high energy density hybrid EMI filter based on improved MCMC 2

A high energy density hybrid EMI filter based on improved MC...

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2nd China Power Supply Society electromagnetic Compatibility Conference, CPEMC 2024

作者： Li, Shuo Zhang, Junzhao Jiang, Dong Liu, Zicheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798331509552

This paper proposes an improved MultiFunction Common Mode Choke (MCMC), and designs a high energy density hybrid EMI filter (HEF). MCMC improves the suppression effect and energy density of the filter by using the Current Transformer (CT) of the active EMI filter (AEF) as the common mode inductor in the passive EMI filter (PEF). By adding inductance to the secondary side of the CT, the improved MCMC strengthens the effective working bandwidth. And the HEF with the improved MCMC, compared to the one with the original MCMC, has significantly better noise suppression effects at both low-frequency and peak noise points, and it also has slight improvements at high frequencies. It is especially suitable for tasks that require higher filter bandwidth. ©2024 IEEE.

关键词： Interference suppression

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A Novel Method for Determining the Source of the Second Traveling Wave in Fault Location of VSC-HVDC Lines 5

A Novel Method for Determining the Source of the Second Trav...

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5th International Conference on Power engineering, ICPE 2024

作者： Shen, Yi Zhao, Zhenting Chen, Luocheng Li, Yinhong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan China

ISBN: (纸本)9798331531140

The traveling wave-based fault location methods for VSC-HVDC lines typically require detecting the second traveling wave after faults occur. However, the second traveling wave may come from different reflected traveling waves, leading to different ways of calculating the fault distance. Therefore, it is necessary to determine the source of the second traveling wave, which is one of the difficulties. This paper analyzes the characteristics of the second voltage traveling wave from different sources and proposes a novel determination method. It uses the sign of the voltage change rate at the arrival time of the second traveling wave front to determine its source and is applicable to both sin-gle-line-to-ground faults and line-to-line faults. The effectiveness of the proposed method is verified in PSCAD/EMTDC. The simulation results demonstrate that this method can accurately determine the source of the second traveling wave under various fault conditions. © 2024 IEEE.

关键词： Wavefronts

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