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Physics Informed Neural Network-based High-frequency Modeling of Induction Motors

Chinese Journal of Electrical Engineering 2022年第4期8卷 30-38页

作者： Zhenyu Zhao Fei Fan Quqin Sun Huamin Jie Zhou Shu Wensong Wang Kye Yak See School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design and Research InstituteWuhan 430000China

The high-frequency(HF)modeling of induction motors plays a key role in predicting the motor terminal overvoltage and conducted emissions in a motor drive *** this study,a physics informed neural network-based HF modeling method,which has the merits of high accuracy,good versatility,and simple parameterization,is *** proposed model of the induction motor consists of a three-phase equivalent circuit with eighteen circuit elements per phase to ensure model *** per phase circuit structure is symmetric concerning its phase-start and phase-end *** symmetry enables the proposed model to be applicable for both star-and delta-connected induction motors without having to recalculate the circuit element values when changing the motor connection from star to delta and vice *** physics knowledge,namely per-phase impedances,are used in the artificial neural network to obtain the values of the circuit *** parameterization can be easily implemented within a few minutes using a common personal computer(PC).Case studies verify the effectiveness of the proposed HF modeling method.

关键词： Equivalent circuit high-frequency(HF)modeling induction motor parameterization physics informed neural network

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Effects analysis of handrail height on sit-to-stand movement under knee joint support in healthy young adults

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Research on Biomedical Engineering 2022年第2期38卷 617-628页

作者： Li, Min Xue, Qiang Yang, Shuo Han, Xiaolong Zhang, Shouwei Tianjin Key Laboratory of Integrated Design and On-Line Monitoring for Light Industry & Food Machinery and Equipment College of Mechanical Engineering Tianjin University of Science & Technology Tianjin300222 China

Purpose: Sit-to-stand (STS) is a basic skill for maintaining a high-quality life. The purpose of this study was to examine the effect of handrail height on the peak moment of the lower extremity joint under the support of the knee joint in ST and to provide quantified kinematics and kinetics data to help determine the STS movement strategy under the optimal handrail height. This research could also provide a starting point for the design and control of STS assistive devices. Methods: Thirty healthy young adult subjects participated in this experiment. They grabbed handrails of different heights to perform STS at a speed of their choice. Kinematics data from the marker points at the subject’s joints were obtained through a high-definition camera, and the reaction forces at the foot, hip, and knee were measured through force-measuring devices. The inverse kinetics method was used to calculate the moment of the subject’s lower limb joints. Finally, kinematics data and kinetic data were analyzed and compared. Results and conclusions: The peak moments of the knee joint and hip joint at different handrail heights were significantly different (P = 0.005, P © 2022, Sociedade Brasileira de Engenharia Biomedica.

关键词： Inverse problems

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Boosting the electrochromic performance of TiO_(2) nanowire film via successively evolving surface structure

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science China Chemistry 2021年第5期64卷 745-752页

作者： Baohu Dai Changzheng Wu Yi Xie Department of Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Chemistry for Energy Materials University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of ChinaHefei 230026China

Electrochromic transition metal oxides(ETMOs)are useful in energy saving devices and smart *** these ETMO candidates,titanium dioxide(TiO_(2))is intriguing for its abundance and environmental safety,but the low color efficiency and slow coloring rate are still barricades to promote its electrochromic ***,we demonstrate an amorphization strategy to comprehensively enhance the performance of TiO_(2) nanowire film(TNF)via atomic layer deposition(ALD)of an additional TiO_(2) conformal layer onto TNF surface,of which the layer structure evolves successively from ordered to disordered,achieving tunable electrochromism by controlling ALD *** the remarkable increment of charging efficiency by~35% and color efficiency by~40%,bleached transmittance rectified optical density(BTR density)and ion diffusion coefficient are boosted by~90% and over 15 times,respectively for TNF deposited with 150 cycles.A large number of self-doped Ti^(3+) defects and hydroxyl units together with order-disorder interconnections in the ALD TiO_(2) layer are responsible for the performance *** concept for successively evolving surface structure shares the feasibility of upgrading conventional ETMOs as well as designing new electrochromic materials.

关键词： electrochromism TiO_(2) evolving surface structure BTR density ALD

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High-performance non-Fermi-liquid metallic thermoelectric materials

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npj Computational Materials 2023年第1期9卷 1943-1949页

作者： Zirui Dong Yubo Zhang Jun Luo Ying Jiang Zhiyang Yu Nan Zhao Liusuo Wu Yurong Ruan Fang Zhang Kai Guo Jiye Zhang Wenqing Zhang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering Department of Physicsand Shenzhen Institute for Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices and Guangdong Provincial Key Lab for Computational Science and Materials DesignSouthern University of Science and TechnologyShenzhen 518055China Materials Genome Institute Shanghai UniversityShanghai 200444China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

Searching for high-performance thermoelectric(TE)materials in the paradigm of narrow-bandgap semiconductors is hampered by a *** we report on the discovery of metallic compounds,TiFe_(x)Cu_(2x−1)Sb and TiFe1.33Sb,showing the thermopower exceeding many TE semiconductors and the dimensionless figure of merits zTs comparable with the state-of-the-art TE materials.A quasi-linear temperature(T)dependent electrical resistivity in 2–700 K and the logarithmic T-dependent electronic specific heat at low temperature coexist with the high thermopower,highlighting the strong intercoupling of the non-Fermi-liquid(NFL)quantum critical behavior of electrons with TE *** structure analysis reveals a competition between the antiferromagnetic(AFM)ordering and Kondo-like spin compensation as well as a parallel two-channel Kondo *** T-dependent magnetic susceptibility agrees with the quantum critical scenario of strong local *** work demonstrates the correlation among high TE performance,NFL quantum criticality,and magnetic fluctuation,which opens up directions for future research.

关键词： materials metallic Fermi

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On the Accuracy and Efficiency of the reactor Operation Digital Twin for Parameter Identification and State Estimation

SSRN

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SSRN 2023年

作者： Hong, Lizhan Gong, Helin Ji, Hongjun Lu, Jialiang Li, Han Li, Qing Paris Elite Institute of Technology Shanghai Jiao Tong University Shanghai200240 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

Accurate and efficient online parameter identification and state estimation are crucial to leveraging Digital Twin simulations for optimizing the operation of near-carbon-free nuclear energy systems. In previous works, we have developed the idea of reactor Operation Digital Twin (RODT). However, non-differentiabilities and discontinuities arise when employing some machine learning based surrogate forward models, challenging traditional gradient-based inverse methods and their variants. This study investigates deterministic and metaheuristic algorithms and further develops hybrid algorithms to address such issues. An efficient modular RODT software framework is presented incorporating these methods into its post-evaluation module for comprehensive comparison. Methods are rigorously assessed based on convergence profiles, stability with respect to noise, and computational performance. Numerical results demonstrate that the hybrid KNNLHS algorithm delivers the optimal balance of accuracy and efficiency for real-time online applications. Meanwhile, algorithms like FSA, DE and ADE exhibit slower yet highly accurate performance. This work advances RODT methodologies to harness machine learning and systems modelling for improved reactor monitoring, systematic diagnosis of off-normal events, lifetime management strategies, etc. The developed modular software and novel optimization methods presented offer pathways to realize the full potential of RODT for transforming energy engineering practices. © 2023, The Authors. All rights reserved.

关键词： State estimation

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A Low-loss X-band Frequency-Selective Rasorber 7

A Low-loss X-band Frequency-Selective Rasorber

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7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： He, Fan Hao, Wenyu Ji, Xiao China Ship Development and Design Center National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment WuHan China Huazhong University of Science and Technology School of Optical and Electronic Information Wuhan China

ISBN: (纸本)9798350384437

This paper proposes a wideband and low insertion loss frequency-selective Rasorber (FSR). The proposed FSR structure consists of windmill-shaped resistive absorbers and double-layer square-ring frequency selective surfaces. The absorber layer incorporates a U-shaped metal structure that acts as an LC parallel resonator, achieving wideband electromagnetic wave transmission. Simulation results show that this FSR design has -1 dB insertion loss from 8.0 to 12.2 GHz, with a minimum of -0.4 dB. A wideband FSR was fabricated and measured to validate the design. © 2024 IEEE.

关键词： Frequency selective surfaces

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China's progress in radionuclide migration study over the past decade(2010–2021):Sorption,transport and radioactive colloid

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Chinese Chemical Letters 2022年第7期33卷 3405-3412页

作者： Zongyuan Chen Siyuan Wang Huijuan Hou Kang Chen Pengyuan Gao Zhen Zhang Qiang Jin Duoqiang Pan Zhijun Guo Wangsuo Wu Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China The Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou UniversityLanzhou 730000China Radiochemistry Laboratory School of Nuclear Science and TechnologyLanzhou UniversityLanzhou 730000China

The radionuclide(RN)migration study is not only helpful to understand environmental behavior of RNs,but also can establish the basis for the safety assessment of geological disposal of high-level radioactive waste(HLW).In the context of China’s HLW disposal,this review briefly summaries the progress of China’s RN migration studies over the past decade regarding three aspects,RN sorption,RN transport and radioactive *** studies from other disciplines(such as geology and environmental science)are also included in this review because they can provide references for the RN migration ***,China has achieved clear progress in RN migration study over the past decade,although large-scaled field experiments are lacked and a gap still exists comparing with the international advanced ***,several suggestions are proposed for future RN migration research in China.

关键词： High-level radioactive waste Sorption Transport Colloid Spectroscopic analysis Theoretical calculation

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Bidirectional Evacuation in Subway Fires Considering the Number of Retrograders and Proactive Avoidance Behavior Based on Experiments and Simulations

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International Journal of Disaster Risk science 2024年第6期15卷 919-934页

作者： Qing Deng Zheng Zhou Shirong Zhang Li Deng Ye Xu Jialing Zhu Huiling Jiang Feng Yu Research Institute of Macro-Safety Science University of Science and Technology BeijingBeijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Honghe Cigarette Factory Hongyunhonghe Tobacco(Group)Co.LTDKunming 652399China Central South Architectural Design Institute Co Wuhan 430071China Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting University of Science and Technology BeijingBeijing 100083China School of International and Public Affairs Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratory of Urban Complex Risk Control and Resilience Governance Shanghai Emergency ManagementShanghai Jiao Tong UniversityShanghai 200030China

Subway fires often cause significant casualties and property *** are some special bidirectional coupling scenarios during subway fires,such as firefighters moving against the evacuation flow to extinguish fires,emergency managers going to the fire scene to respond to emergencies,or other similar *** to evacuate passengers quickly and enable responders to enter the fire scene has become a big challenge for subway fire evacuation and *** core goal is to reduce the degree of mutual interaction between these people moving in opposite *** this study,the impact of counterflow individuals and proactive avoidance behavior on evacuation processes was investigated through experiments and *** Fire Dynamic Simulator was used to simulate the development of a fire scenario to determine the available safe egress ***-evacuation experiments were conducted to obtain actual evacuation parameters,such as the speeds of different *** these parameters as input,a macro subway fire scenario was built to simulate the bidirectional evacuation *** conclusions were obtained from the experiments and evacuation *** results indicate that the overall evacuation time increases with the number of *** avoidance behavior can effectively reduce the travel time of counterflow individuals,but it causes slight delays for forward-moving *** optimization strategy was implemented through conductor *** passengers can successfully evacuate under the optimization strategy,with a 25.3%improvement in overall evacuation *** research provides some insights into the coordinated evacuation and emergency response during subway fires or similar scenarios.

关键词： Bidirectional pedestrian flows Evacuation experiment Macro-evacuation simulation Proactive avoidance behavior Subway fire

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Tunable meron pair excitations and Berezinskii-Kosterlitz-Thouless phase transitions in the monolayer antiferromagnet MnPSe3

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Physical Review B 2024年第10期109卷 L100403-L100403页

作者： Guokai Liao Shunhong Zhang Ping Cui Zhenyu Zhang International Center for Quantum Design of Functional Materials (ICQD) University of Science and Technology of China Hefei 230026 Anhui China Hefei National Laboratory University of Science and Technology of China Hefei Anhui 230088 China

Exploration of exotic quantum physics in magnetic systems of reduced dimensionality is among the central themes of condensed matter physics. Here we investigate the nature of magnetic couplings, topological excitations, and critical phenomena in monolayer MnPSe3, a representative two-dimensional antiferromagnet. We first establish, based on first-principles calculations, that the S=5/2Mn2+ ions possess single-ion anisotropy, favoring in-plane magnetization, and exhibit isotropic antiferromagnetic pairwise couplings. Next, our atomistic magnetics simulations identify antiferromagnetically coupled meron pairs to be the characteristic topological excitations, whose size, polarity, and dynamics can be delicately tuned by an external magnetic field. Significantly, a critical temperature of ∼30 K is indicated in both the susceptibility and specific heat, and detailed scaling analyses on the spin correlations and stiffness unambiguously attribute the critical behavior to the Berezinskii-Kosterlitz-Thouless universality class. Our findings thereby provide an ideal candidate antiferromagnetic counterpart of the recently identified monolayer XY ferromagnet of CrCl3, the former may harbor distinct topological excitations and multicriticality.

关键词： Magnetic phase transitions Magnetic vortices Density functional calculations Heisenberg model

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Research on the Measurement of Driving Shaft Angle of Automobile Air Conditioning Actuator Based on Image Processing technology

Research on the Measurement of Driving Shaft Angle of Automo...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Luo, Bo Peng, Wenjing Xiao, Jing Fang, Chonghua Changjiang Polytechnic Electromechanical Automobile Academy Wuhan China Graduate School of Education Tohoku University Sendai Japan Hubei Science and Technology College Wuhan China China Ship Development and Design Centre Science and Technology on Electromagnetic Compatibility Laboratory Wuhan China

ISBN: (纸本)9798350358971

Based on the OpenCV image processing technology and the special geometric structure of the object to be tested, the rotation angle of the transmission shaft of the automobile air conditioning actuator is measured by the secondary data processing of the calculated angle. Through the verification of 10 samples, the measurement error is less than% of the 0.19, which provides key technical support for the realization of automatic zero and rotation accuracy detection of the transmission shaft. © 2023 IEEE.

关键词： Angle detection Automobile air conditioning actuator OpenCV

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