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Enhancing lithium-ion and electric conductive Li_(2)FeSiO_(4)cathode through in situ boron-doping and carbon-coating strategy

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Rare Metals 2022年第12期41卷 4055-4064页

作者： Hao-Xiang Li Jia-Hui Zhu Xiao-Bing Huang Tao Zhou Yu-Rong Ren Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Water Treatment Functional Materials Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion AircraftCollege of Chemistry and Materials EngineeringHunan University of Arts and ScienceChangde 415000China Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power BatterySchool of Materials Science and EngineeringChangzhou UniversityChangzhou 213164China

The extremely low electrical conductivity and ion-diffusion coefficient of Li_(2)FeSiO_(4)limits its application as a cathode material in lithium-ion ***,in situ boron-doped Li_(2)FeSi_(1)-xB_(x)O_(4-δ)/C(x=0,0.01,0.03,0.05 and 0.07)at the Si site was prepared via the solid-state reaction method using pitch as the c arbon source.B doping in the lattice structure and a c arbon coating on the surface of the composites could effectively enhance the Li^(+)/electron ***,the reduced particle size of the active material with the relatively high specific area via borondoped modification could improve the wettability between the electrolyte and *** the synergistic effect of appropriate boron doping and carbon coating,it exhibits a good rate performance,specific capacity,and cycling *** a result,the as-prepared Li_(2)FeSi_(0.95)B_(0.05)O_(4-δ)/C cathode showed a high discharge capacity of 160.7mAh·g^(-1)at 0.2C,and the capacity retention rate was 96%after 100 cycles at *** work presents an effective path for designing advanced cathode materials for lithium-ion batteries.

关键词： Li_(2)FeSiO_(4) Carbon coating Boron doping Synergistic effect Lithium-ion battery

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Performance Analysis and Design Optimization of Tubular Linear Oscillating Machine with Novel Compound Halbach Array

Performance Analysis and Design Optimization of Tubular Li...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Xiang, Pengjie Yan, Liang Wang, Tianyi Ge, Lijia Gerada, Chris Aboelhassan, Ahmed School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Lab Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China University of Nottingham NottinghamNG7 2RD United Kingdom Alexandria1029 Egypt Key Laboratory of More Electric Aircraft Technology of Zhejiang Province University of Nottingham Ningbo China Ningbo315100 China

ISBN: (纸本)9789811966125

To achieve high force output and low mover mass of tubular linear oscillating machines simultaneously, we proposed a novel compound Halbach array consisting of the outer layer of quasi-Halbach array and inner layer of axial magnetized pattern. This magnetic pattern can completely removed the high-density back iron existed in conventional linear PM machines due to the much improvement of self-shielding effect. Thus, the mover mass can be greatly reduced and hence high dynamic performance can be obtain. Firstly, the mathematical models of the magnetic field and force output are established. And then, the key design parameters of the compound Halbach array are extracted from the analytical models. Besides, the response surfaces of force output and thrust fluctuation are established for investigating the coupling effect of these key design parameters on output characteristics. A multi-objective genetic optimization algorithm is performed to obtain structural parameters. Finally, the electromagnetic characteristics of the compound Halbach array are compared with conventional Halbach array to verify its merits. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Electromagnetic shielding

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A Rapid and Integrated Modeling Method of aircraft Vulnerability Based on CATIA Analysis Simulation Module 5th

A Rapid and Integrated Modeling Method of Aircraft Vulnerabi...

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5th China Aviation science and technology Conference, 2021

作者： Pei, Yang Shi, Likuan Ge, Yuxue Li, Mingsuo Bai, Chunyu Zhang, Yu School of Aeronautics Northwestern Polytechnical University Xi’an710072 China Science and Technology on Electro-Optic Control Laboratory Luoyang471009 China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Aircraft Strength Research Institute of China Xi’an710065 China

ISBN: (纸本)9789811674228

aircraft vulnerability modeling is the basis and prerequisite for vulnerability analysis. At present, vulnerability modeling methods include combinatorial geometry, triangular patch, and tetragonal patch. However, these methods have disadvantages such as low modeling accuracy, complex modeling process, and finite element software. Under the problems of the above methods, a vulnerability modeling method is proposed based on the CATIA Analysis Simulation module, in which the secondary development of the aircraft shape and the tetragonal mesh, materials, and attribute of the components data file are completed. In this method, the geometrical modeling and meshing are synchronized and integrated into the CATIA platform which shortens the vulnerability pre-modeling process. Taking the US "Scan Eagle" UAV as an example, the input model file for vulnerability analysis is generated. The effect of this method and the traditional finite element modeling method is compared in C and K kill levels, which verifies the validity and usability of the proposed method. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： aircraft

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Research on Traffic Inspection Method in Urban Irregular Area Based on Multi-UAV 23

Research on Traffic Inspection Method in Urban Irregular Are...

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23rd COTA International Conference of Transportation Professionals: Emerging Data-Driven Sustainable Technological Innovation in Transportation, CICTP 2023

作者： Yue, Guanghua Du, Wentao Yue, Jiangfeng Liu, Chenglong Du, Yuchuan Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji Univ. Shanghai China Henan Wanli Transportation Technology Group Co. Ltd. Xuchang China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Univ. of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9780784485040

ISBN: (纸本)9780784485040

When multiple unmanned aerial vehicles (UAV) patrol urban traffic status, the complex road network, and high buildings lead to irregularities in the airspace above. In addition, the communication signals and positioning systems between multi-UAV are often easily blocked by buildings and plants. Traditional multi-UAV path planning algorithms cannot guarantee mission reliability. In this paper, we take the actual typical scene of urban environmental traffic inspection as an example and propose a distributed weak-sensing UAV swarm scanning coverage based on the action mechanism of neighboring members in the cluster, combined with the virtual artificial potential field method to constrain the consistent behavior system. This method can realize the adaptive scanning coverage of irregular areas by multi-UAV coordination under limited communication in the urban environment and avoid collisions between UAVs and buildings. It has a good application sweep coverage in urban traffic inspection in the future. © ASCE.

关键词： Inspection

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A Slider-Type Trim Strategy to Deal with Wing Perforation Damage Based on CFD 5th

A Slider-Type Trim Strategy to Deal with Wing Perforation Da...

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5th China Aviation science and technology Conference, 2021

作者： Peng, Qiancheng Pei, Yang Li, Mingsuo Bai, Chunyu Zhang, Yu School of Aeronautics Northwestern Polytechnical University Xi’an710072 China Science and Technology on Electro-Optic Control Laboratory Luoyang471009 China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Aircraft Strength Research Institute of China Xi’an710065 China

ISBN: (纸本)9789811674228

In this paper, a numerical simulation study is carried out on the aerodynamic characteristics of the aircraft wing surface after damage. The damage form is the wing perforation. To study the aerodynamic characteristics of the UAV under the condition of varying degrees of damage to the wings of the small airplane model, establish the geometric model of the airplane model in the CATIA 3D modeling software, and establish the geometric model in ANSYS ICEM and divide the calculation domain flow field grid. Perform aerodynamic calculations in ANSYS FLUENT. Firstly, the aerodynamic characteristics of the undamaged aircraft are calculated and analyzed, and then the aerodynamic characteristics of each damage situation are compared according to the different damage positions, and a response strategy using the slider as an auxiliary trim method is proposed. The research results have certain reference value for aircraft design of this type of layout. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Wings

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A Enhanced Feature Extraction for 3D Object Detection

A Enhanced Feature Extraction for 3D Object Detection

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System Simulation technology and its Application (CCSSTA), IEEE China Conference on

作者： Qingao Meng Jigang Tong Sen Yang Tian Xie Xin Jin The School of Electrical Engineering and Automation Tianjin University of Technology Tianjin China National Key Laboratory of Science and Technology on Aircraft Control Avic Xi’an Flight Automatic Control Research Institute Xi’an China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

3D object detection is crucial for autopilot and augmented reality applications. However, accurate feature extraction is the key to achieve high-precision detection, but traditional methods face the challenges of information loss and computational inefficiency. To address this, we propose an enhanced feature extraction method. We first divide the 3D space into voxel grids of varying scales. Then, using 3D sparse convolution, we extract features which are compressed along the Z axis to form BEV (Bird’s Eye View) feature images. An efficient multi-scale attention mechanism is then employed to enhance these BEV features. The refined feature map is subsequently located and classified through a CT-stacking module and RPN (Region Proposal Network). Voxel features from the proposal and 3D backbone are passed through a voxel RoI pool to directly extract RoI features from the 3D features for further refinement. Finally, a cascaded attention network refines the proposal and strengthens confidence prediction. Experiments on test set validate our method effectiveness, showing improved accuracy over traditional voxel methods. Overall, this enhanced feature extraction technique offers a promising solution for 3D target detection, particularly in scenarios demanding high real-time performance and precision.

关键词： Three-dimensional displays Accuracy Convolution Object detection Detectors Feature extraction Transformers Systems simulation Proposals Data mining

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Helicopter Rotor Fault Diagnosis based on IPSO and RVM 14

Helicopter Rotor Fault Diagnosis based on IPSO and RVM

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Si, Xiaoyi Zheng, Liang Zheng, Guo Wang, Jinglin Zhao, Zhenping Guo, Ziang School of Electronic Information Hangzhou Dianzi University Hangzhou China AVIC United Technology Center for Basic Research on Aircraft System Fault Diagnosis and Health Management Shanghai Institute of Aerospace Control Engineering Shangai China Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai Institute of Aerospace Control Engineering Shangai China

ISBN: (纸本)9798350301359

To address the issue of low accuracy in traditional rotor fault diagnosis during the helicopter rotor fault diagnosis process, this paper presents a fault diagnosis method based on the Improved Particle Swarm Optimization (IPSO) algorithm for Relevance Vector Machine (RVM). The fitness function of the IPSO algorithm is defined as the mean squared error between the predicted classification results obtained through cross-validation and the actual classification. The IPSO algorithm is used to search for the optimal width factor of the RVM kernel function and establish the fault diagnosis model. Through simulation experiments and comparisons with Particle Swarm Optimization (PSO) algorithm-based RVM and Improved Particle Swarm Optimization-based Support Vector Machine (SVM), it is demonstrated that this approach, compared to traditional rotor fault diagnosis methods, effectively improves the accuracy of fault recognition. © 2023 IEEE.

关键词： Fault Diagnosis Helicopter Rotor Improved Particle Swarm Optimization Relevance Vector Machine

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Fixed-Time Bipartite Tracking Consensus of Heterogeneous Multi-Agent Systems Subject to Input Disturbances 42

Fixed-Time Bipartite Tracking Consensus of Heterogeneous Mul...

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42nd Chinese control Conference, CCC 2023

作者： Ren, Ruichi Qin, Kaiyu Deng, Wantao Yue, Jiangfeng Shi, Mengji Lin, Boxian School of Aeronautics and Astronautics University of Electronic Science and Technology of China Chengdu611731 China The Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu611731 China Southwest Institute of Technical Physics Chengdu610000 China

ISBN: (纸本)9789887581543

This paper investigates the fixed-time bipartite tracking consensus problem for heterogeneous multi-agent systems (HMASs) in a directed signed network. The HMASs consist of a fractional-order leader and first-order followers which subject to input disturbances. Not only the different dynamic characteristics, but also the directional communication networks among heterogeneous agents, which increase the difficulty of controller design. According to the Lyapunov stability theory and graph theory, a more compact fixed-time distributed protocol is proposed, which rejects bounded disturbances by simply specifying a sufficiently large gain coefficient for the nonlinear control input. Under the designed protocol, followers can achieve bipartite consensus tracking for leader agent within a preset settling time, which is independent of the initial values of agents. Finally, several simulation tests are presented to verify the effectiveness of the proposed controller. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Multi agent systems

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The Configuration of Medium Voltage Distribution Transformer for Extremely High Voltage laboratory 7

The Configuration of Medium Voltage Distribution Transformer...

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7th International Conference on Smart Grid and Smart Cities, ICSGSC 2023

作者： Duan, Zemin Si, Xiaoliang Zhang, Song Zhang, Xining Li, Hua National Key Laboratory of Electromagnetic Information Control and Effects Hefei China Aviat. Sci. and Technol. Key Laboratory of Strong Electromagnetic Environment Protection Technology Hefei China Anhui Province Key Laboratory of Aircraft Lightning Protection Hefei China Institute of Plasma Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China University of Science and Technology of China Hefei China

ISBN: (纸本)9798350305913

Transformer is the most important component in power distribution design, and its long-term operation cost determines the operation cost of power distribution system. Therefore, it is necessary to analyze the transformer configuration considering efficiency and economy for extremely high voltage laboratory, which is used for study the lightning impact and protection of aircraft. In this paper, a medium voltage distribution system is designed to adapt the operation of extremely high voltage laboratory for lightning test. We analyze the basic information such as the type of distribution transformer, power loss and core material Then the model and capacity selection of the transformer are calculated and compared based on the actual load category and operation curve. According to the above analysis, a transformer configuration network with the lowest total cost in thirty years is proposed. This scheme provides the technical support for the implementation of aircraft lightning protection experiments. At the same time, the research can also be extended to power generation and distribution, laboratories or buildings with similar power architecture, which has promising application value. © 2023 IEEE.

关键词： Lightning

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An Optimization Method for the Swing of a Quadrotor Flight Suspension System

An Optimization Method for the Swing of a Quadrotor Flight S...

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System Simulation technology and its Application (CCSSTA), IEEE China Conference on

作者： Sen Yang Xinlian Zang Jigang Tong Tian Xie Xin Jin The School of Electrical Engineering and Automation Tianjin University of Technology Tianjin China National key laboratory of science and technology on aircraft control AVIC Xi’an Flight Automatic Control Research Institute Xi‘an China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

The aim of this study is to explore optimization control methods for suspension systems during the flight of quadcopters. The traditional control method of suspension system has some problems such as oscillation and instability, so an optimization scheme based on Gaussian pseudo-general algorithm is proposed in this paper. Through numerical simulation and actual flight test, the effectiveness of the optimization algorithm in improving system stability and reducing oscillation amplitude is verified. At the same time, this study conducted a comparative analysis of the suspension system of the quadrotor vehicle and the free fall body, and the optimization algorithm is found to be feasible and can well improve the control accuracy and stability of the system, and provide strong support for the safety of the quadrotor vehicle in various application scenarios.

关键词： Suspensions (mechanical systems) Accuracy Stability analysis Robustness Systems simulation Safety Vehicle dynamics Oscillators Numerical stability Quadrotors

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