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4th International Conference on Power and Energy technology, ICPET 2022

作者： Chen, Liang Xu, Yijie Yang, Chunyu China Ship Development and Design Centre Science and Technology on Electromagnetic Compatibility Laboratory Wuhan430064 China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

An adaptive active power filter (APF) for the DC grid in ships is proposed to suppress harmonic currents above kilohertz. The delay notch Filtered X-Least Mean Square (FXLMS) algorithm is introduced as the control algorithm of adaptive APF in this paper. Taking the typical twelve-pulse rectifier device of DC grid in ships as an example, a MATLAB / Simulink simulation model of APF based on both delay notch FXLMS algorithm and classical FXLMS algorithm are built, and the calculation amount of the two algorithms is compared. The harmonic suppression effect of delay notch FXLMS algorithm in the situation that harmonic source changes dynamically is also simulated. © 2022 IEEE.

关键词： Ships

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Recent progress and perspectives in additive manufacturing of magnesium alloys

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Journal of Magnesium and Alloys 2022年第6期10卷 1511-1541页

作者： Zhuoran Zeng Mojtaba Salehi Alexander Kopp Shiwei Xu Marco Esmaily Nick Birbilis College of Engineering and Computer Science Australian National UniversityACT.2601 Australia Additive Manufacturing Group Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A∗STAR)73 Nanyang Drive637662 Singapore Meotec GmbH Philipsstr.8AachenGermany State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsh1410082 China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States of America Volvo Materials Technology Laboratory Volvo GroupLundbyGothenburg 41715Sweden

Magnesium alloys remain critical in the context of light-weighting and advanced devices. The increased utilisation of magnesium(Mg)each year reveals growing demand for its Mg-based alloys. Additive manufacturing(AM) provides the possibility to directly manufacture components in net-shape, providing new possibilities and applications for the use of Mg-alloys, and new prospects in the utilisation of novel physical structures made possible from ‘3D printing’. The review herein seeks to holistically explore the additive manufacturing of Mg-alloys to date, including a synopsis of processes used and properties measured(with a comparison to conventionally prepared Mg-alloys). The challenges and possibilities of AM Mg-alloys are critically elaborated for the field of mechanical metallurgy.

关键词： Magnesium Additive manufacturing Microstructure 3D printing Mechanical properties Electrochemical properties

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Research on a Fin-Rudder-Propeller Integrated Underwater Robot 8

Research on a Fin-Rudder-Propeller Integrated Underwater Rob...

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8th International Conference on Control, Automation and Robotics, ICCAR 2022

作者： Ge, Zhuo Yang, Bin Xiong, Wen Marine Design And Research Institute Of China Science And Technology On Water Jet Propulsion Laboratory Shanghai China

ISBN: (纸本)9781665481168

This paper focuses on the design of a novel fin-rudder-propeller integrated underwater robot, which has high maneuverability and bionic movement ability. According to the structural form, Degree of Freedom (DOF) configuration and motion mode, the control model and vector control method of the robot is presented. In order to improve energy efficiency, driving performance, and obtain high torque density, electromagnetic design, simulation verification and structural design of the underwater rim motor used in the robot are carried out, and the physical prototype development of the underwater motor is completed. Based on the overall hardware design of the robot, the kinematics control model of the robot is established. Using the sliding-mode control method, a trajectory tracking controller is designed and verified by simulation experiments. © 2022 IEEE.

关键词： Vector control (Electric machinery)

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Study on low cycle fatigue of ferritic-martensitic steel at high temperature 2

Study on low cycle fatigue of ferritic-martensitic steel at ...

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2023 2nd International Conference on Materials Engineering and Applied Mechanics, ICMEAAE 2023

作者： Feng, Zhao Hu, Yifeng Cheng, Pengming Liu, Xiao Wang, Hui Department of Engineering Mechanics Xi'An University of Technology China School of Materials Science and Engineering Xi'An Jiaotong University China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu610213 China School of Mechanical Engineering Chengdu University Chengdu610106 China

In 2011, a serious nuclear accident occurred in Fukushima, Japan, and one of the major causes was the destruction of the cladding material mainly made of Zr alloy due to a violent chemical reaction with high-temperature water vapor. Since then, scholars in various countries have been trying to find a better nuclear fuel cladding material. Because of its high temperature strength, ferritic/martensitic(F/M) steel is used in thermal power units. Over the past hundred years, the high temperature performance of ferritic/martensitic steel has developed simultaneously with the operating temperature of thermal power system. F/M steel is widely used in nuclear power system as well as thermal power, The fatigue life of nuclear fuel cladding material is an important parameter to study its service life, due to the special shape of the cladding material, especially for the pipe with a thickness of less than 0.5mm, it is difficult to directly measure its mechanical properties, this paper through special experimental materials and fixtures F/M pipe steel at room temperature and high temperature tensile test, as well as low cycle fatigue performance test, and its fracture port, surface crack analysis. Through the analysis and processing of experimental data, typical stress-cycle life curves, total strain amplitude-life curves, elastic strain amplitude-life curves, hysteresis curves with different strain amplitudes, and fatigue life prediction curves were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Nuclear fuels

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Engineering Exciton-Phonon Interactions for Suppressing Nonradiative Energy Loss in Energy-Transfer-Initiated Photocatalysis

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CCS Chemistry 2023年第1期5卷 234-244页

作者： Hui Wang Sen Jin Aolei Wang Xiang Jiang Wenxiu Liu Xiaodong Zhang Wensheng Yan Kuai Yu Jin Zhao Yi Xie Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefeiAnhui 230026 Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui 230031 Department of Physics CAS Key Laboratory of Strongly-Coupled Quantum Matter PhysicsInternational Center for Quantum Design of Functional MaterialsUniversity of Science and Technology of ChinaHefeiAnhui 230026 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefeiAnhui 230029 Institute of Microscale Optoelectronics Shenzhen UniversityShenzhenGuangdong 518060 Department of Physics and Astronomy University of PittsburghPittsburghPA 15260 CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefeiAnhui 230031

The prevalent excitonic effects in low-dimensional semiconductors enable energy-transfer-initiated photocatalytic solar-to-chemical energy ***,the generally strong interactions between excitons and lattice vibrations in these low-dimensional systems lead to robust nonradiative energy loss,which inevitably impedes photocatalytic performance of energy-transfer-initiated ***,we highlight the crucial role of engineering exciton-phonon interactions in suppressing nonradiative energy losses in low-dimensional semiconductor-based *** taking bismuth oxybromide(BiOBr)as an example,we demonstrate that phonon engineering could be effectively implemented by introducing Bi-Br vacancy *** on nonadiabatic molecular dynamics simulations and spectroscopic investigations,we demonstrate that the defective structure can promote exciton-low-frequency phonon coupling and reduce exciton-high-frequency optical phonon *** from the tailored couplings,nonradiative decay of excitons in defective BiOBr is significantly suppressed,thereby facilitating exciton accumulation and hence energy-transfer-initiated photocatalysis.

关键词： photocatalysis exciton-phonon interaction nonradiative decays energy transfer

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An IGBT Device Health Status Assessment Method Considering the Influence of Operating Conditions

An IGBT Device Health Status Assessment Method Considering t...

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IEEE/IAS Industrial and Commercial Power System Asia (I&CPS Asia)

作者： Cheng Yang Zeyu Duan Ran Yao Hui Li Wei Lai Yuan Min Yannan Yuan Wenxing Han State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China ChengDu China

The Insulated Gate Bipolar Transistor (IGBT) is a critical component of power electronic equipment, and its health is of utmost importance to ensure the reliability and stability of the entire system. This paper proposes a method for assessing the health status of IGBT device under various operating conditions. Firstly, a finite element model of the IGBT device is established to analyze the influence of solder layer void and bond line detachment on the saturation voltage of the device. Secondly, the device parameters are simulated under different working conditions, and an adaptive neural network algorithm is used to establish the IGBT equipment health state evaluation model. Finally, the results of the model are analyzed, and the prediction results under random conditions are compared with the simulation results. The results show that this method effectively evaluates the health status of IGBT devices.

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High-performance Cu_(0.95)V_(2)O_(5) nanoflowers as cathode materials for aqueous zinc-ion batteries

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Rare Metals 2022年第1期41卷 29-36页

作者： Xin Yu Fang Hu Zhi-Qiang Guo Lei Liu Gui-Hong Song Kai Zhu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Weifang City Planning&Design Institute Weifang 261000China Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150010China

Exploring high-performance cathode materials for aqueous zinc ion batteries(ZIBs)is still one of the critical *** vanadate compound has become a potential cathode material for ZIBs with a novel displacement reaction mechanism of reversible reduction/oxidation of Cu^(2+)/Cu^(0).Herein,we reported Cu_(0.95)V_(2)O_(5)nanoflowers prepared using a hydrothermal synthesis method as a capable cathode material for *** Cu_(0.95)V_(2)O_(5)nanoflowers exhibit high specific capacity of 405 mAh·g^(-1) at the current density of 100 mA·g^(-1),benefiting from the displacement reaction mechanism and phase transformation mechanism from Cu_(0.95)V_(2)O_(5)to the open and stable architecture Cu_(0.4)V_(2)O_(5)and Zn3(OH)2V2O7·2H2O *** cathode exhibits excellent rate performance with a high capacity of-200 mAh·g^(-1)at 5 A·g^(-1) and outstanding cycle stability with a capacity retention of 92%after 1000 *** is anticipated that the novel Cu_(0.95)V_(2)O_(5)nanoflowers are promising cathode material in the application for zinc ion batteries.

关键词： flowers performance cathode

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In-situ study of damage mechanisms in Mg-6Li dual-phase alloy

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Journal of Materials science & technology 2024年第12期179卷 114-124页

作者： Jing Li Li Jin Sangbong Yi Xin Zhang Jie Dong Ming Luo Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi'an 710072China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute of Materials and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany

Interfaces play a crucial role in influencing the mechanical properties of Mg *** Mg-Li dual-phase alloy,the type of interfaces is complex,which includes both grain boundary and phase boundary,and the influence of such interfaces on the damage nucleation is yet to be *** this paper,in-situ scanning electron microscopy(SEM)based measurements were carried out to investigate the meso-scale damage nucleation mechanisms of the Mg-6Li dual-phase *** show that 94.8%of cracks are nucleated at the α-Mg grain boundary in the post-uniform elongation stage,while 5.2%are at phase boundary and almost no crack at the β-Li grain *** initiation of α-Mg grain boundary cracks is attributed to strain incompatibility,which induces micro-strain localization,and then causes grain boundary sliding(GBS)and crack *** compatibility analysis reveals that the geometric compatibility factor(Mk)can be used to predict the nucleation of α-Mg grain boundary *** Mk is lower than 0.075,α-Mg grain boundary cracks tend to *** cracks are generated at the phase boundary is due to the mild strain partitioning between α-Mg phase and β-Li phase and may also be partly attributed to multiple slip systems in body-centered cubic(BCC)-structured β-Li phase,which can accommodate well with the deformation of adjacent α-Mg phase.

关键词： Crack nucleation Strain localization Grain boundary sliding Phase boundary Mg–6Li dual-phase alloy

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Evaluation of a Numerical Model for Predicting Flow and Heat Transfer in a Hexagonal Helical Cruciform Seven-Rods Bundle and Analysis of Rod Bundle Size Independence

SSRN

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SSRN 2024年

作者： Jiang, Dianqiang Deng, Jian Zhang, Dalin Zhou, Xingguang Xiao, Changzhi Tian, Wenxi Qiu, Suizheng Su, Guanghui H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu610213 China China Institute of Atomic Energy Beijing611731 China

In this study, the accuracy and applicability of the numerical model are comprehensively evaluated based on the experimental data of a hexagonal helical cruciform (HC) seven-rods bundle. The STAR CCM+ is utilized as a tool to obtain predicted results of flow and heat transfer in different flow regions. The numerical results indicate that it is an improved method to set a negative heat flux on the hexagonal wall in the laminar flow region. The Reynolds stress transport model can accurately predict the experimental results of heat transfer in the transitional flow region, with an average wall temperature deviation of 2.8℃. The SST k-ω model with cubic constitutive option can accurately predict the experimental results of the flow resistance, and a relative error of f is 1.8%. In the turbulent flow region, the SST k-ω model with cubic constitutive option provides an accurate prediction, with an average wall temperature deviation of 3.7℃. The realizable k-Ε two-layer model can accurately predict the flow resistance, and the relative error of f is 0.1%. The preferred numerical model is used to analyze the size independence of the HC rod bundle. This work provides certain guidelines for the accurate simulation in the HC seven-rods bundle. © 2024, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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An intelligent target detection method of UAV swarms based on improved KM algorithm

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Chinese Journal of Aeronautics 2021年第2期34卷 539-553页

作者： Xiangming ZHENG Chunyao MA Key Laboratory of Fundamental Science for National Defense Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Complete and efficient detection of unknown targets is the most popular application of UAV swarms. Under most situations, targets have directional characteristics so that they can only be successfully detected within specific angles. In such cases, how to coordinate UAVs and allocate optimal paths for them to efficiently detect all the targets is the primary issue to be solved. In this paper, an intelligent target detection method is proposed for UAV swarms to achieve real-time detection requirements. First, a target-feature-information-based disintegration method is built up to divide the search space into a set of cubes. Theoretically, when the cubes are traversed, all the targets can be detected. Then, a Kuhn-Munkres(KM)-algorithm-based path planning method is proposed for UAVs to traverse the cubes. Finally, to further improve search efficiency, a 3 D realtime probability map is established over the search space which estimates the possibility of detecting new targets at each point. This map is adopted to modify the weights in KM algorithm, thereby optimizing the UAVs’ paths during the search process. Simulation results show that with the proposed method, all targets, with detection angle limitations, can be found by UAVs. Moreover, by implementing the 3 D probability map, the search efficiency is improved by 23.4%–78.1%.

关键词： 3D probability map Kuhn-Munkres algorithm Path planning Real-time control Swarm intelligence Target detection Unmanned aerial vehicle(UAV)

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