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Research on current decoupling control of six-phase permanent magnet linear synchronous motor for electromagnetic launch

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International Journal of Mechanical System Dynamics 2021年第2期1卷 267-277页

作者： Xingfa Sun Jin Xu Junjie Zhu Department of Electrical Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power SystemNaval University of EngineeringWuhanChina

Six-phase permanent magnet linear synchronous motor(PMLSM)for electromagnetic launch(EML)system presents the characteristics of a high order,nonlinearity,multivariable,strong coupling,and nonperiodic transient operation in the synchronous rotating coordinate system,posing a great challenge to the dynamic response ability of the current *** research on current decoupling control(CDC)mainly focuses on cross decoupling within a three-phase system,even though there are neither decoupling methods for multiphase systems nor effective evaluation criteria for the decoupling and dynamic response *** this perspective,this paper first presents an equivalent reduced-order complex-matrix dynamic mathematical model of six-phase PMLSM and analyze its transient coupling characteristics during the process of ***,the CDC methods of six-phase PMLSM based on direct compensation and matrix diagonalization principles are realized,respectively,to accomplish the cross decoupling and back electromotive force decoupling within and between different three-phase ***,an all-round method is proposed,for the first time,to evaluate the decoupling performances and dynamic response performances of different CDC strategies for six-phase *** superiority of deviation decoupling regulator in decoupling performance and robustness are verified based on high-speed EML experimental platform of six-phase PMLSM.

关键词： complex-matrix mathematical model current decoupling control electromagnetic launch strong transient

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Attitude control for Flying-Wing UAV Based on Active Disturbance Rejection control

Attitude Control for Flying-Wing UAV Based on Active Disturb...

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International Conference on Guidance, Navigation and control, ICGNC 2024

作者： Shen, Boyuan Huang, Xi Li, Qingxian Qi, Pengyuan School of Automation and Electrical Engineering Beihang University Beijing100191 China National Key Laboratory of Aircraft Integrated Flight Control Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China

ISBN: (纸本)9789819622115

So as to deal with the poor static stability, strong nonlinear aerodynamic parameters and serious coupling of control rudder surface of flying-wing UAV. On the basis of the theory of active disturbance rejection control (ADRC), this attitude controller consists of two parts, which are outer angle controller and inner angle velocity controller. The simulation displays that this attitude controller shows advantageous control effect and strong robustness. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Disturbance rejection

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Preparation and regulation of electromagnetic parameters of Ti3C2Tx@Ni composite powders 2

Preparation and regulation of electromagnetic parameters of ...

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2024 2nd International Conference on Materials science and Intelligent Manufacturing, MSIM 2024

作者： Hu, Shujun Li, Shibo Pan, Peng Ge, Feng Yang, Ming Yu, Jinxi Wang, Jinnan Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

Novel electromagnetic (EM) materials with adjustable EM properties are anticipated to fulfill the requirements of electronic communication, national defense, and aerospace fields. In this study, functional Ti3C2Tx@Ni composite powders with adjustable Ni content were successfully prepared using a facile electroless plating strategy. The EM parameters can be regulated by controlling the Ni content in Ti3C2Tx@Ni composite powders. As the Ni content increases, the values of real and imaginary parts of the complex permittivity of the Ti3C2Tx@yNi/wax (y = 10 ∼ 80) in the 2-18 GHz show a trend of initially decreasing and then increasing. The real and imaginary parts of the complex permeability of Ti3C2Tx@yNi/wax range from 0.95 to 1.03 and -0.10 to 0.07, respectively. After introducing magnetic Ni, Ti3C2Tx exhibits dielectric and magnetic losses on EM waves, with dielectric losses having a greater dissipation on the EM waves. © Published under licence by IOP Publishing Ltd.

关键词： Dielectric losses

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Flexible and conductive polyvinyl alcohol/Ti3C2Txcomposite film with excellent electromagnetic interference shielding performance 3

Flexible and conductive polyvinyl alcohol/Ti3C2Txcomposite f...

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3rd International Conference on Computer technology, Information Engineering, and Electron Materials, CTIEEM 2023

作者： Hu, Shujun Li, Shibo Beijing National Innovation Institute of Lightweight Ltd. Beijing101400 China State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Group Beijing101400 China Centre of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9781510672925

Lightweight composites with flexibility and ideal electromagnetic interference (EMI) shielding performance are required for protecting electronic devices against electromagnetic wave pollution. Herein, binary flexible and conductive polyvinyl alcohol (PVA)/Ti3C2Tx composite film with a "brick-and-mortar"structure was prepared using a vacuum filtration self-assembly strategy. By the combination of PVA and Ti3C2Tx, the PVA/Ti3C2Tx composite films have been successfully obtained, leading to high electrical conductivity (≥12.3 S/cm) and superior EMI shielding efficiency (≥27 dB, 8.2-12.4 GHz). The preparation of PVA/Ti3C2Tx film offers a promising approach for designing and fabricating flexible high-performance MXene-based EMI shielding materials, which may be applied in various applications including flexible wearable electronic devices and portable equipment. © 2024 SPIE.

关键词： Electromagnetic pulse

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A Digitally assisted nonlinearity suppression architecture using over-the-air beam cancelation

A Digitally assisted nonlinearity suppression architecture u...

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作者： Mu, Qin Li, Nanxi Chen, Cong Wei, Xiaozheng Wen, Rong Wu, Muqing Li, Xiang Liu, Ying School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China National Key Lab of Science and Technology on Communications University of Electronic Science and Technology of China Chengdu China School of Network and Communication Engineering Chengdu Technological University Chengdu China Laboratory of Electromagnetic Space Cognition and Intelligent Control Beijing China

Using a large number of power amplifiers brings serious nonlinear distortion to 5G communication systems, which becomes a challenging problem for conventional digital predistortion (DPD) to linearize signals. To address this challenge, we propose a digitally assisted nonlinearity suppression architecture for applications in multiple antenna arrays. In this architecture, we use an auxiliary array to generate a nonlinear cancelation signal to cancel with the main beam at the receiving end. We explore a two-step method to model the nonlinear signal and combine neural network to complete the modeling. In addition, we introduce a novel method for estimating and tracking the channel to update the model coefficients. To verify the proposed methods, we design a scene and compare the performance of our architecture with that of conventional DPD. Our experiments demonstrate that our proposed methods can significantly enhance the adjacent channel power leakage ratio performance by 12 dB while also optimizing in-band distortion. Moreover, our architecture outperforms conventional DPD approaches even with enhanced distortion. © 2023 John Wiley & Sons Ltd.

关键词： Power amplifiers

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Maternal or post-weaning dietary fructo-oligosaccharide supplementation reduces stillbirth rate of sows and diarrhea of weaned piglets

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Animal Nutrition 2024年第2期17卷 155-164页

作者： Kaidi Ma Bin Su Fuyong Li Jinfeng Li Jiawei Nie Wenyu Xiong Jinxi Luo Shuangbo Huang Tong Zhou Xide Liang Facai Li Jinping Deng Chengquan Tan Guangdong Provincial Key Laboratory of Animal Nutrition Control National Engineering Research Center for Breeding Swine IndustryInstitute of Subtropical Animal Nutrition and FeedCollege of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642China Guangzhou Pucheng Biological Technology Co. Guangzhou 511300China Baolingbao Biology Co. LtdDezhou 251200China

Fructo-oligosaccharides(FOS)are well-known prebiotics that have the potential to improve sow reproductive performance and increase piglet ***,previous studies were observed in sole FOS-supplemented diets of sows or weaned piglets and did not consider the sow-to-piglet transfer effect on the performance and diarrhea rate of weaned *** study explores the effects of dietary FOS supplementation on the reproductive performance of sows,and the effects of FOS supplementation at different stages on the growth performance and diarrhea rate of weaned piglets.A split-plot experi-mental design was used with sow diet effect in the whole plot and differing piglet diet effect in the ***-two multiparous sows(223.24±14.77 kg)were randomly divided into 2 groups(0 or 0.2%FOS).The experiment lasted from day 85 of gestation to day 21 of *** performance,glucose tolerance,placental angiogenesis,and intestinal flora of sows were *** weaning,192 weaned piglets were grouped in 2 × 2 factorial designs,with the main effects of FOS supplemental level of sow diet(0 and 0.2%),and FOS supplemental level of weaned piglet diet(0 and 0.2%),*** growth performance and diarrhea rate of the weaned piglets were analyzed during a 28-d *** dietary supplementation of FOS was shown to reduce the stillbirth and invalid piglet rates(P<0.05),improve the insulin sensitivity(P<0.05)and fecal scores(P<0.05)of sows,increase the abundance of Akkermansia muciniphila(P=0.016),decrease the abundance of Escherichia coli(P=0.035),and increase the isovalerate content in feces(P=0.086).Meanwhile,the placental angiogenesis marker CD31 expression was increased in sows fed FOS diet(P<0.05).Moreover,maternal and post-weaning dietary FOS supplementation reduced the diarrhea rate of weaned piglets(P<0.05)and increased the content of short-chain fatty acids in feces(P<0.05).Furthermore,only post-weaning dietary FOS sup-plementation could improve

关键词： Stillbirth Diarrhea Fructo-oligosaccharide Sow Weaned piglet

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The growth and expansive applications of amorphous Ga_(2)O_(3)

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Chinese Physics B 2023年第8期32卷 52-68页

作者：奚昭颖杨莉莉舒林聪张茂林李山史丽刘增郭宇锋唐为华 Innovation Center for Gallium Oxide Semiconductor(IC-GAO) College of Integrated Circuit Science and EngineeringNanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for RF Integration and Micro-Assembly Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory for Organic Electronics and Information Displays(KLOEID)&Institute of Advanced Materials(IAM) Jiangsu Key Laboratory for BiosensorsJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory of Aerospace Information Materials and Physics Nanjing University of Aeronautics and AstronauticsMinistry of Industry and Information TechnologyNanjing 211106China

As a promising ultra-wide bandgap semiconductor material,gallium oxide(Ga_(2)O_(3))is attracting extensive attention of researchers due to its feasible growth process,appropriate bandgap of 4.4 e V-5.3 e V allowing for deep-ultraviolet(deepUV)detection,good physical and chemical stability,high breakdown field strength and electron mobility,*** from the strict processes for controllable crystalline Ga_(2)O_(3)(usually refer to as stable monoclinicβ-Ga_(2)O_(3)),amorphous Ga_(2)O_(3)(a-Ga_(2)O_(3))film can be prepared uniformly at low temperature on a large-area deposition substrate,suggesting great advantages such as low manufacturing cost and excellent flexibility,dispensing with high-temperature and high vacuum ***,a-Ga_(2)O_(3)extremely facilitates important applications in various applied ***,in this concise review,we summarize several major deposition methods for a-Ga_(2)O_(3)films,of which the characteristics are ***,potential methods to optimize the film properties are proposed by right of the inspiration from some recent ***,the applications of a-Ga_(2)O_(3)thin films,e.g.,in photodetectors,resistive random access memories(RRAMs)and gas sensors,are represented with a fruitful discussion of their structures and operating mechanisms.

关键词： amorphous-Ga_(2)O_(3) thin film functional application

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Hierarchy-based extended CBBA for multi-robot task assignment

Hierarchy-based extended CBBA for multi-robot task assignmen...

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2022 Chinese Automation Congress, CAC 2022

作者： Liu, Jiajun Xia, Weiguo Li, Fuqiang Wang, Peng China National Aeronautical Radio Electronic Research Institute National Key Laboratory of Science and Technology on Avionics System Integration China Dalian University of Technology Key Lab. of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering China

ISBN: (纸本)9781665465335

This paper studies the task assignment problem of a multi-robot system with complex constraints including the robot speed limit, the task execution time window constraints, the arrival time, the trip cost, and different priorities of the tasks. A new bidding function is then designed for each robot. Based on the k-means algorithm, a hierarchy-based extended consensus-based bundle algorithm (CBBA) is proposed to find the optimal solution for the task allocation problem. Finally, simulation examples are presented to show the feasibility of the proposed algorithm and comparisons with existing algorithms show that the proposed algorithm can reduce the task assignment time with guaranteed reward values. © 2022 IEEE.

关键词： Multipurpose robots

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Cooperative Filtering with Range Measurements: A Distributed Constrained Zonotopic Method 7th

Cooperative Filtering with Range Measurements: A Distribute...

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7th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2023

作者： Ding, Yu Cong, Yirui Wang, Xiangke Cheng, Long College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9789819733316

This article studies the distributed estimation problem of a multi-agent system with bounded absolute and relative range measurements. Parts of the agents are with high-accuracy absolute measurements, which are considered as anchors;the other agents utilize low-accuracy absolute and relative range measurements, each derives an uncertain range that contains its true state in a distributed manner. Different from previous studies, we design a distributed algorithm to handle the range measurements based on extended constrained zonotopes, which has low computational complexity and high precision. With our proposed algorithm, agents can derive their uncertain range sequentially along the chain topology, such that agents with low-accuracy sensors can benefit from the high-accuracy absolute measurements of anchors and improve the estimation performance. Simulation results indicate the effectiveness of our algorithm and verify our method can significantly improve the estimation accuracy. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Multi agent systems

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Energy mechanism of bolt supporting effect to fissured rock under static and dynamic loads in deep coal mines

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International Journal of Mining science and technology 2024年第3期34卷 371-384页

作者： Deyuan Fan Xuesheng Liu Yunliang Tan Xuebin Li Shenglong Yang College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China National Energy Group Ningxia Coal Industry Co. Ltd.Yinchuan 753001China

The stability control of fissured rock is difficult,especially under static and dynamic loads in deep coal *** this paper,the dynamic mechanical properties,strain rate evolution and energy dissipation of fissured and anchored rocks were respectively obtained by SHPB *** was found that bolt can provide supporting efficiency-improving effect for fissured rock against dynamic disturbance,and this effect increased quadratically with decrease in anchoring ***,the energy dissipation mechanism of anchored rock was obtained by slipping ***,bolt energy-absorbing mechanism by instantaneous tensile-shear deformation was expressed based on material mechanics,which was the larger the anchoring angle,the smaller the energy absorption,and the less the contribution to supporting efficiency *** this basis,the functional relationship between energy dissipation of anchored rock and energy absorption of bolt was *** the coal-gangue separation system of Longgu coal mine as an example,the optimal anchoring angle can be determined as 57.5°–67.5°.Field monitoring showed fissured rock with the optimal anchoring angle,can not only effectively control the deformation,but also fully exert the energy-absorbing and efficiency-improving effect of bolt *** study provides guidance to the stability control and supporting design for deep engineering under the same or similar conditions.

关键词： Static and dynamic loads Anchored rock Energy absorption Anchoring angle Engineering verification

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