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International Conference on Wireless Communications, Networking and Applications (WCNA 2022)

作者： Tong, Xin Zhang, Xuehe Liu, Gangfeng Li, Changle Zhao, Jie Harbin Institute of Technology Heilongjiang Harbin15000 China State Key Laboratory of Robotics and System Harbin China

ISBN: (纸本)9789819939503

Aiming at problems of long-distance and steep-slope FAST (Five-hundred-meter Aperture Spherical radio Telescope) cable detection, a set of vision system and its processing method based YOLOX are proposed. This system overcomes many difficulties such as collecting high-altitude samples and complex background environment in FAST cable detection tasks, and It achieves the accurate positioning and classification of defects. Good detection effects have been achieved for multi-morphology, multi-scale, especially small defects. The defect detection system was validated on three defect data sets which could affect the normal use of the cable, and the accuracy is 91.7%. Thus the system and method can meet the efficiency and accuracy requirements of FAST cable detection, and it can also be practically applied to other various cables. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cables

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Giant infrared bulk photovoltaic effect in tellurene for broad-spectrum neuromodulation

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Light(Science & Applications) 2024年第11期13卷 2812-2823页

作者： Zhen Wang Chunhua Tan Meng Peng Yiye Yu Fang Zhong Peng Wang Ting He Yang Wang Zhenhan Zhang Runzhang Xie Fang Wang Shuijin He Peng Zhou Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina State Key Laboratory of ASIC and System Department of MicroelectronicsFudan UniversityShanghaiChina University of Chinese Academy of Sciences BeijingChina School of Life Science and Technology ShanghaiTech UniversityShanghaiChina School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhanChina Shanghai Clinical Research and Trial Center ShanghaiChina

Given the surpassing of the Shockley-Quiesser efficiency limit in conventional p-n junction photovoltaic effect,bulk photovoltaic effect(BPVE)has garnered significant research ***,the BPVE primarily focuses on a narrow wavelength range,limiting its potential *** we report a giant infrared bulk photovoltaic effect in tellurene(Te)for broad-spectrum *** generated photocurrent in uniformly illuminated Te excludes other photoelectric effects and is attributed to the *** bulk photovoltaic wavelength in Te spans a wide range from the ultraviolet(390 nm)to the mid-infrared(3.8μm).Moreover,the photocurrent density of 70.4 A cm^(−2) under infrared light simulation outperforms that in previous ultraviolet and visible semiconductors as well as infrared *** attached to the dendrites or somata of the cortical neurons successfully elicit action potentials under broad-spectrum light *** work lays the foundation for the further development of infrared BPVE in narrow bandgap materials.

关键词： effect spectrum ultraviolet

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Practical Research on a New Type of Electric Field Sensor 4

Practical Research on a New Type of Electric Field Sensor

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4th IEEE International Conference on Electrical Materials and Power Equipment, ICEMPE 2023

作者： Ke, Kun Yang, Qing Liao, Wei Qiu, Zhenhui Ma, Lewei Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

ISBN: (纸本)9798350334678

Aiming at the problems of large size, limited measurement band range and high cost of traditional voltage transformers, this paper designs a new electric field sensor based on the D-dot principle, which is only the size of a coin and the volume is greatly reduced. The static response and frequency characteristics of the sensor are tested by the built sensor performance test platform, and the test results show that the sensor can produce good static response for different waveforms, and the measurement frequency range is between 10Hz-l0kHz and has good linearity, which can not only realize low-frequency measurement but also meet the requirements of high-frequency measurement. Furthermore, the sensor is placed under the simulated transmission line, and the experimental results show that the output law of the sensor is consistent with the simulation results under different spacing and different voltage levels, in line with the electromagnetic field distribution law. Finally, the cost is compared and analyzed, and the analysis shows that the sensor has a high cost performance, which shows that the sensor has broad practical application prospects. © 2023 IEEE.

关键词： Electric power transmission

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Nonlinear free vibration of piezoelectric semiconductor doubly-curved shells based on nonlinear drift-diffusion model

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Applied Mathematics and Mechanics(English Edition) 2023年第10期44卷 1761-1776页

作者： Changsong ZHU Xueqian FANG Jinxi LIU State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures in Hebei Shijiazhuang 050043China School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808Guangdong ProvinceChina

In this paper, the nonlinear free vibration behaviors of the piezoelectric semiconductor(PS) doubly-curved shell resting on the Pasternak foundation are studied within the framework of the nonlinear drift-diffusion(NLDD) model and the first-order shear deformation theory. The nonlinear constitutive relations are presented, and the strain energy, kinetic energy, and virtual work of the PS doubly-curved shell are *** on Hamilton's principle as well as the condition of charge continuity, the nonlinear governing equations are achieved, and then these equations are solved by means of an efficient iteration method. Several numerical examples are given to show the effect of the nonlinear drift current, elastic foundation parameters as well as geometric parameters on the nonlinear vibration frequency, and the damping characteristic of the PS doublycurved shell. The main innovations of the manuscript are that the difference between the linearized drift-diffusion(LDD) model and the NLDD model is revealed, and an effective method is proposed to select a proper initial electron concentration for the LDD model.

关键词： nonlinear free vibration piezoelectric semiconductor(PS)doubly-curved shell nonlinear drift-diffusion(NLDD)model linearized drift-diffusion(LDD)model

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Aging Mechanism and Life Estimation of Photovoltaic Inverter DC-link Capacitors in Alternating Humid and Thermal Environment

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Chinese Journal of Electrical Engineering 2024年第1期10卷 48-62页

作者： Quanyi Gao Shuaibing Li Yi Cui Yongqiang Kang Haiying Dong School of New Energy and Power Engineering Lanzhou Jiaotong UniversityLanzhou 730070China State Key Laboratory of Large Electric Drive System and Equipment Technology Tianshui 741000China School of Engineering University of Southern QueenslandSpringfield 4300Australia

DC-link capacitors play a vital role in managing ripple voltage and current in converters and various *** study focuses on exploring the aging characteristics of DC-link capacitors in alternating humid and thermal environments aligned with the operational conditions in photovoltaic and wind power *** to relevant power equipment standards,we designed a 24-h alternating humid and thermal aging environment tailored to the requirements of DC-link *** aging test platform is established,and 20 widely used metallized polypropylene film capacitors are selected for *** such as the capacitance,equivalent series resistance(ESR),and phase angle are assessed during aging,as well as the onset time and extent of aging at various *** study focuses on the aging mechanisms,analyzing electrode corrosion,the self-healing process,and dielectric *** the aging characteristics enabled us to calculate the lifespan of the capacitor and predict it under different degrees of capacitance *** results show that under alternating humid and thermal conditions,capacitance attenuation and ESR increase exhibit exponential nonlinearity,influenced by factors such as the oxidation and self-healing of capacitive metal electrodes,dielectric main-chain fracture,and crystal *** study underscores the pivotal role of encapsulation in determining the aging decay time.

关键词： DC-link capacitors aging mechanism life prediction metallized film capacitors

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Semantic Analysis and Modeling of the Color of Stage Costume - A Case Study of 'The Painting Journey'

Semantic Analysis and Modeling of the Color of Stage Costume...

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2024 International Conference on Culture-Oriented Science and technology, CoST 2024

作者： Huang, Wenli Liu, Bowen Sun, Fang Wang, Shuang Communication University of China State Key Laboratory of Media Convergence and Communication 100024 China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Communication University of China 100024 China Beijing Key Laboratory of Modern Entertainment Technology Communication University of China 100024 China

ISBN: (纸本)9798350380347

The creation of Chinese dance dramas plays an important role in the dissemination of Chinese culture in the context of pluralistic unity. As one of the outstanding poetry dramas in the past two years, 'The Journey of a Legendary Landscape Painting' (JLLP) has rich national cultural connotations and aesthetic value in its stage costume colors. This article first studied the data extraction method of stage costume colors based on clustering and association rule mining, and constructed the color dataset for JLLP. On this basis, the color semantic mining and extraction including subjective and objective factors were conducted. Finally, combined with color semantics, the character personality of JLLP was further analyzed. The research results show that the color extraction method designed in this article can accurately preserve the color characteristics of stage costumes. In addition, the costume colors of JLLP play a good supporting role in shaping the character personality. © 2024 IEEE.

关键词： Semantics

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Health monitoring by optical fiber sensing technology for rechargeable batteries

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eScience 2024年第1期4卷 79-95页

作者： Yi Zhang Yanpeng Li Zezhou Guo Jianbo Li Xiaoyu Ge Qizhen Sun Zhijun Yan Zhen Li Yunhui Huang State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubei430074China School of Optical and Electronic Information National Engineering Laboratory for Next Generation Internet Access SystemWuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhanHubei430074China Henan Key Laboratory of Laser and Opto-electric Information Technology School of Electrical and Information EngineeringZhengzhou UniversityZhengzhouHenan45001China

With the proposal of a“smart battery,”real-time sensing by rechargeable batteries has become progressively more important in both fundamental research and practical ***,many traditional sensing technologies suffer from low sensitivity,large size,and electromagnetic interference problems,rendering them unusable in the harsh and complicated electrochemical environments of *** optical sensor is an alternative approach to realize multiple-parameter,multiple-point measurements ***,it has garnered significant *** analyzing these measured parameters,the state of interest can be decoded to monitor a battery's *** review summarizes current progress in optical sensing techniques for batteries with respect to various sensing parameters,discussing the current limitations of optical fiber sensors as well as directions for their future development.

关键词： Optical fiber sensing Rechargeable battery Real-time sensing Health monitoring

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Dynamic Contrast Analyzer for Generating Health Indicators in Machinery Monitoring Under Time-varying Speed Conditions

Dynamic Contrast Analyzer for Generating Health Indicators i...

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2024 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2024

作者： Liu, Wenyi Yu, Jianbo Department of Industrial Engineering Tongji University Shanghai China State Key Laboratory of Large Electric Drive System and Equipment Technology Tianshui China

ISBN: (纸本)9798350386097

Machinery health monitoring under time-varying speed conditions is an ongoing challenge, where the significant variations in rotational speed frequently result in false alarms and missed defect detections. In this paper, a simple method, i.e., dynamic contrast analyzer (DC-Analyzer), is proposed to generate health indicators for machinery self-adaptive monitoring. Contrastive learning is used to adjust the representational features of vibration signals with various speeds, which facilitates the self-extraction of manifold trend over speeds. A minor network is proposed to perform feature regression between rotational speeds and vibrational representations for condition alignment. The final health indicators of rotating machinery can be obtained by calculating the feature similarity of real-time vibrational representations and corresponding approximate features from the regressor. The effectiveness of DC- Analyzer is verified on a rolling bearing test rig. The results show that the proposed method outperforms those representative approaches in health indicator generating, which provides more potential for the issue of dynamic and time-varying conditions. © 2024 IEEE.

关键词： Roller bearings

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An Optimal Control Based Trajectory Planning Method for Cooperative Merging Maneuvers 3

An Optimal Control Based Trajectory Planning Method for Coop...

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3rd International Symposium on Intelligent robotics and systems, ISoIRS 2023

作者： Wang, Qi Ge, Hao Duan, Xuting Zhou, Jianshan School of Transportation Science and Engineering Beihang University State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control State Key Laboratory of Air Traffic Management System and Technology Beijing China Nanjing Research Institute of Electronic Engineering State Key Laboratory of Air Traffic Management System and Technology Nanjing China School of Transportation Science and Engineering Beihang University State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Beijing China

ISBN: (纸本)9798350339963

Due to the prediction errors and diverse driving styles of surrounding vehicles, traffic congestion and even accidents can occur in the traffic bottleneck area where vehicles merge into the main road. To ensure that connected and automated vehicles (CAVs) can quickly and efficiently merge into the main road, this paper proposes a cooperative trajectory planning method based on optimal control for vehicle cut-in scenarios. A optimal control model is constructed, and a quintic polynomial is used to generate the initial solution of the optimal control problem to accelerate the solution process and improve the success rate. Finally, The obtained merging trajectory is then synchronized with the movement of vehicles on the main road to optimize their actions and ensure a safe merging process. Joint simulation with Robot Operating system (ROS) and RVIZ is utilized, and the results show that the proposed algorithm can quickly obtain cooperative results, the locally successful merging trajectory meets the requirements of smoothness and safety, and if the solution does not allow merging, the merging vehicle is instructed to terminate the execution. © 2023 IEEE.

关键词： Trajectories

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Analysis of AC and DC Demagnetization of a Rare Earth Free Permanent Magnet Assisted Synchronous Reluctance Motor 26

Analysis of AC and DC Demagnetization of a Rare Earth Free P...

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26th International Conference on Electrical Machines and systems, ICEMS 2023

作者： Chen, Bin Yang, Xiangyu Hu, Yusheng Jia, Jinxin Wang, Hanxin Yang, Xiaojuan South China University of Technology Academy of Electric Power Guangzhou China Guangdong Provincial Key Laboratory of High-speed and Energy Conservation Motor System Zhuhai China State Key Laboratory of Airconditioning Equipment and System Energy Conservation Guangdong Provincial Key Laboratory of High-speed and Energy Conservation Motor System Zhuhai China State Key Laboratory of Airconditioning Equipment and System Energy Conservation Zhuhai China

ISBN: (纸本)9798350317589

During the operation of a rare earth free permanent magnet assisted synchronous reluctance motor(PMaSynRM) in vehicles, under harsh operating conditions, a large instantaneous current will be generated, and a reverse magnetic field will be applied to the permanent magnet, resulting in irreversible demagnetization of the permanent magnet [1-3]. To avoid the above issues, this article takes a permanent magnet synchronous reluctance main drive motor as an example and establishes an AC/DC demagnetization simulation model based on finite element technology. The motor is analyzed and optimized for demagnetization simulation. And establish corresponding demagnetization test methods to verify the simulation results through experiments. The experimental results show that the transient field dynamic demagnetization simulation method can effectively reflect the AC/DC demagnetization ability of the motor, and AC demagnetization is more severe than DC demagnetization. This summarizes the demagnetization standards for PMaSynRM used in vehicles. This provides a reference for the optimization and testing of demagnetization simulation of permanent magnet assisted synchronous reluctance motors for vehicles. © 2023 IEEE.

关键词： Demagnetization

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