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Multimaterial additive manufacturing manipulator for fabricating magnetoelectric pressure sensors

Science China(Technological Sciences) 2022年第11期65卷 2542-2550页

作者： LIU ZhuFeng LI ZhaoQing WANG Qi WANG Yan YANG Lei NIE Xiang GENG Peng WU ZhenHua TANG SiHan YANG Lei WU HongZhi SHI YunSong CHEN Peng SU Bin ZHANG LiChao YAN ChunZe SHI YuSheng State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and Technology Wuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Schol of Materials Science and Enginering Wuhan Insitute of TechnologyWuhan 430205Chinai School of Transportation and Logisis Engineering Wuhan University of TechnologyWuhan 430063China Deparment of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Wuhan 430030China

The simultaneous placement of different types of materials including polymers,ceramics,and metals,in their desired positions could be adopted to manufacture end-use devices/apparatuses with diverse functionalities and significantly reduce the fabrication cost and ***,existing additive manufacturing(AM)approaches can only treat one material species at a time due to their intrinsic working *** we develop an AM manipulator for manufacturing a wide variety of material species,including polymers,ceramics,and metals,through a multifilament transport strategy assisted by laser *** six-jaw manipulator contains three pairs of filament delivering/cutting systems for transporting diverse materials and a beam of tunable laser as the thermal *** whole apparatus is integrated into a robotic manipulator to create a multifreedom manufacturing *** this innovation,products with multiple material species and desired complex geometries can be fabricated on ***,we synthesize a multimaterial(polymer/ceramic/metal)printed magnetoelectric pressure sensor that can convert applied mechanical forces to electricity and maintain efficiency even after undergoing 10000 cycles of pressure/*** this multimaterial filament transport and laser manufacturing strategy,our AM manipulator exhibits promising application in the advanced manufacturing of embedded electronics,sensors,soft robotics,and customizable medical devices.

关键词： multiple materials additive manufacturing laser manipulator magnetoelectric

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Virtual Impedance Control for Enhancing the Inertia Provision of Grid-forming Doubly-fed Induction Generator

Virtual Impedance Control for Enhancing the Inertia Provisio...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yanjun Liu Yifan Fang Jiabing Hu Wei He Meng Zhan State Key Laboratory of Advanced Electromagnetic Technology and School of Electrical and Electronic Engineering Huazhong University of Science and Technology China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

Grid-forming converters (GFMs) are regarded as a solution to enhancing the frequency support ability of the power grid. Applying the virtual synchronous generator (VSG) technology, GFM mimics the swing function of synchronous generators (SGs). It is found in this paper, however, that the inertia provision of VSG-based grid-forming doubly-fed induction generator (VSG-DFIG) is limited. The root cause is analyzed, indicating that the resistive-inductive internal impedance is not beneficial to providing power support under unbalanced active power disturbances. To address this issue, the terminal voltage controller (TVC) is modified by adding a virtual impedance control, rather than applying supplementary controllers on the active power control sections. The virtual impedance control optimizes the characteristic of the equivalent inertia of the DFIG and strengthens the inertial response. Finally, preliminary simulation results are presented to verify the feasibility of the proposed control strategy.

关键词： Resistors Time-frequency analysis Simulation Power system stability Synchronous generators Stability analysis Impedance

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Performance Evaluation of Novel Segmental Rotor Switch Reluctance Motor with Magnetic Bridge 27

Performance Evaluation of Novel Segmental Rotor Switch Reluc...

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27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Su, Sinian Sun, Jianbo Zhang, Shuixi Wang, Honggang Wang, Shuanghong Yang, Yang Zhao, Ziqi Qu, Ronghai Wu, Huangyuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Henan Power Company Luohe Power Supply Company China Henan Tailong Power EquipmentCo. Ltd China Cyan Exploring Power Technology Wuxi Co Wuxi China

ISBN: (纸本)9784886864406

The segmented rotor switched reluctance motor (SSRM) has the characteristics of a short magnetic circuit, high torque density, low wind resistance, and high efficiency compared to the traditional switched reluctance motor (SRM). However, the complex manufacturing process of SSRM acts against their use. In this paper, a new type of segmented rotor switched reluctance motor with a rotor magnetic bridge (SSRMMB) is proposed, which connects the rotor blocks into a whole. The static inductance characteristics of the SSRM and SSRMMB are investigated through electromagnetic simulation. The performance of the two motors is then comparatively analyzed under angle position control (APC) and unipolar sinusoidal excitation control (USC), with a further analysis of the reasons for any differences. The simulation results show that there is little difference in the performance of the two motors during normal operation. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Reluctance motors

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

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

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

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

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

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.

关键词： Rails Particle beams Contacts Dynamics Current distribution Armature Market research Numerical models electromagnetics Optimization

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Small-Signal Stability Analysis of Parallel Grid-Connected System with Grid-Forming Converter and Grid-Following Converter

Small-Signal Stability Analysis of Parallel Grid-Connected S...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Xiayan Li Changsong Chen Lin Gan Chenxi Bai Taihang He State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

In order to guarantee the stable operation of new energy sources when connected to the power system through converters, it is of paramount importance to conduct thorough research the small-signal stability of parallel grid-connected system with grid-forming converter (GFM) and grid-following converter (GFL). Initially, the state-space small-signal model of the parallel grid-connected system with GFM and GFL are derived. Subsequently, the impact of the phase-locked loop (PLL) bandwidth, virtual inertia, and reactive power loop integral coefficient on system stability is assessed using the eigenvalue locus method. Moreover, the participation factor analysis method is employed to identify the dominant state variables of the oscillatory mode. Finally, the correctness of the theoretical analysis is validated using PLECS.

关键词： Reactive power Grid following Bandwidth Power system stability Stability analysis Eigenvalues and eigenfunctions Circuit stability Phase locked loops Integrated circuit modeling Grid forming

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Strain engineering in electrocatalysis:Strategies,characterization,and insights

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Nano Research 2024年第5期17卷 3603-3621页

作者： Qibo Deng Peng Xu Hassanien Gomaa Mohamed A.Shenashen Sherif A.El-Safty Cuihua An Li-Hua Shao Ning Hu School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China Department of Chemistry Faculty of ScienceAl-Azhar University71524AssiutEgypt Department of Petrochemical Egyptian Petroleum Research Institute(EPRI)Nasr City11727CairoEgypt Center for Functional Materials National Institute for Materials Science(NIMS)1-2-1 SengenTsukubaIbaraki-ken305-0047Japan State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of Educationand School of Mechanical EngineeringHebei University of TechnologyTianjin 300401China National Key Laboratory of Strength and Structural Integrity Institute of Solid MechanicsSchool of Aeronautic Science and EngineeringBeihang UniversityBeijing100191China Advanced Equipment Research Institute Co. Ltd.of HEBUTTianjin 300401China

Strain engineering,as a cutting-edge method for modulating the electronic structure of catalysts,plays a crucial role in regulating the interaction between the catalytic surface and the adsorbed *** electrocatalytic performance is influenced by the electronic structure,which can be achieved by introducing the external forces or stresses to adjust interatomic spacing between surface *** challenges in strain engineering research lie in accurately understanding the mechanical impact of strain on *** paper first introduces the basic strategy for generating the strain,summarizes the different strain generation forms and their advantages and *** progress in researching the characterization means for the lattice strains and their applications in the field of electrocatalysis is also ***,the challenges of strain engineering are introduced,and an outlook on the future research directions is provided.

关键词： strain electrocatalysis characterization chemical reaction kinetics lattice mismatch

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

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

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Electrical engineering and Control Science (IC2ECS), International Conference on

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

ISBN: (数字)9798331510107

ISBN: (纸本)9798331510114

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.

关键词： Electrical engineering Insulation Surface waves Surface resistance High-voltage techniques Flashover Market research Power conversion Voltage control Pulsed power systems

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The Impact Analysis of Line Inductance on System Amplitude and Frequency Stability in the Converter Interfaced System

The Impact Analysis of Line Inductance on System Amplitude a...

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International Conference on Power and Energy technology (ICPET)

作者： Qiumeng Xu Sicheng Wang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

With the transition to cleaner energy sources, a high proportion of renewable devices often needs to be connected to the grid through long transmission lines, which increases the risk of system instability. The system is composed of device and network, both of which have influence on system stability. The impact of device control parameters on system stability has been widely studied, but the impact of network on system stability should not be overlooked. This paper focuses on the line inductance in the network. Firstly, it elucidates the implications of the system Amplitude and Frequency (A&F) stability, considering the dynamic characteristics of both device and the network. Secondly, it analyzes the high-order dynamic characteristics of the inherent relationship between the excitation of the amplitude/frequency of internal voltage and the response of active/reactive current, under the constraints imposed by line inductance in the network. This analysis reveals the essence of the dominant feature of this relationship, which is influenced by the system oscillation frequency. Finally, the system oscillation frequency was analyzed through closed-loop simulation, which affects the A&F stability of the system by affecting the energy storage capacity of the line inductance. This paper establishes a general understanding of the energy storage capacity of line inductor in the grid and lays the foundation for further understanding and analyzing of the mechanism of power system instability problems.

关键词： Inductance Renewable energy sources Power transmission lines Power system dynamics Voltage Power system stability Stability analysis Inductors Oscillators Energy storage

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Control Delay Compensation of Three-Level Synchronous SVPWM Based on Smith Predictor

Control Delay Compensation of Three-Level Synchronous SVPWM ...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zhengxiao Wang Kaifeng Liu Caiyong Ye Haoqi Liu Shanming Wan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

High-speed and high-power motor drive systems are critical for applications such as electric vehicles and industrial automation. These systems often utilize synchronous space vector pulse width modulation (SSVPWM) strategies to optimize performance. However, the multi-mode synchronous SVPWM will bring about a sudden change in the phase angle due to the switching of the number of pulses. This paper proposes a method employing the Smith predictor to correct phase and amplitude errors caused by digital control delays. Compared with the existing methods, this method can respond to phase error more quickly, especially at low carrier ratio, thus improving the stability and performance of the system.

关键词： Space vector pulse width modulation Electrical engineering Motor drives Error compensation Switches Predictive models Electric vehicles Stability analysis Inverters Delays

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Multivariate Evaluation and Enhancement Methods of the Hosting Capacity of Distributed Photovoltaic

Multivariate Evaluation and Enhancement Methods of the Hosti...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Yaowen Liu Haishun Sun Suyue Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331530174

ISBN: (纸本)9798331530181

Distributed photovoltaic (DPV), represented by household rooftop PV, has been developing rapidly under the promotion of county-wide rooftop PV policy in China. However, its large-scale integration has brought serious challenges to the reliability of the distribution network. It is of great significance to scientifically evaluate the hosting capacity of DPV and provide hosting capacity improvement strategies. By constructing distribution network operational reliability evaluation indexes, the maximum hosting capacity of DPV is evaluated by considering several factors, such as power flow, bus voltage, new energy consumption, etc. The DPV capacity is dispersed evenly to each distribution network bus, which more accurately simulates the dense distribution scenario of household PV and improves the accuracy of the hosting capacity results. A demand response (DR) model based on a two-layer game between load aggregators and distribution network operators is constructed, and the results of the calculation show that the maximum hosting capacity of DPV can be effectively improved based on guaranteeing the maximum interests of both parties. This research provides a scientific basis for the rational planning of the construction scale of DPV.

关键词： Photovoltaic systems Distribution networks Games Minimization Planning Reliability Indexes Load modeling Capacity planning Load flow

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