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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Wang, Yongbin Dai, Yifan Hu, Hao Xue, Shuai Bao, Jiahui College of Intelligence Science National University of Defense Technology Changsha410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of DefenseTechnology Changsha410073 China Hu' nan Key Laboratory of Ultra-precision Machining Technology Changsha410073 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Sub-nanometer precision optical components are widely used in optical systems. As the key equipment of sub-nanometer precision calculation, the dynamic performance of ion beam figuring equipment is very important. However, most studies have focused on optimizing ion beam figuring processes;However, the research on the dynamic performance of machine tools with sub-nanometer precision is not sufficient and comprehensive. At present, most of the research is limited to the analysis of plane machining, that is, only the dynamic performance of the scanning axis is analyzed. As the surface shape changes from plane to surface, the accuracy requirement is from nanometer to sub-nanometer, so the influence of the scanning axis cannot be simply considered. The dynamic performance of the target distance axis of three-axis ion beam figuring equipment under different surface shape characteristics and removal function characteristics of the sub-nanometer machining process was analyzed theoretically and simulated. The results of this study can promote the application of three-axis ion beam figuring equipment in the manufacture of complex surfaces and high-precision optical components. © 2022 SPIE

关键词： Machine tools

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Visual Management based on integrated Convolution Neural Network 2

Visual Management based on Integrated Convolution Neural Net...

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2nd International Conference on Machine Vision, Image Processing and Imaging technology, MVIPIT 2024

作者： Gao, Jie Shi, Dongqiang Zhang, Ying Quality Manage Department Beijing Aerospace Automatic Control Institute Beijing China Project Manage Department Beijing Aerospace Automatic Control Institute Beijing China National Key Laboratory of Science and Technology on Aerospace Intelligent Beijing Aerospace Automatic Control Institute Peking University Beijing China

ISBN: (纸本)9798331543037

Using convolutional neural network technology for model compression, the convolutional layer operation speed is improved through multiple row-column parallel computing units in the convolution operation acceleration module. At the same time, it is proposed that a convolution operation acceleration module should be used to build a multi-way parallel architecture of the convolution layer, saving time and improving management efficiency. By utilizing IP core development and efficient management of algorithm hardware, image big data pre-processing and post-processing calculations are realized through PS-side instruction scheduling. Using a dedicated neural network processor architecture and a dedicated algorithm acceleration core, computing power support is provided, the autonomy of the visual image management system is improved, and the dependence on measurement and control equipment is reduced, thereby realizing the rapid deployment of neural networks. ©2024 IEEE.

关键词： Convolutional neural networks

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A Data Association Method Based on Azimuth Inverse Cotangent Value 7

A Data Association Method Based on Azimuth Inverse Cotangent...

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7th International Youth Conference on Radio Electronics, Electrical and Power Engineering, REEPE 2025

作者： Zou, Nan Yin, Muze Zhang, Guangpu Yang, Zhenqi Ma, Pengbo Li, Dongyu Harbin Engineering University National Key Laboratory of Underwater Acoustic Technology Harbin China Harbin Engineering University Ministry of Industry and Information Technology Key Laboratory of Marine Information Acquisition and Security Harbin China Harbin Engineering University College of Underwater Acoustic Engineering Harbin China Science and Technology on Electronic Information Control Laboratory Chengdu China

ISBN: (纸本)9798331531836

In this paper, we address the challenge of data association in scenarios involving multiple observers for underwater non-cooperative localization, where it is unclear how measurement data from different stations corresponds to the same target. We propose a novel data association method that leverages the inverse cotangent of azimuthal sequence features. The method first calculates the sequence of cotangent values measured by each station's bearing in a limited time. Linearly analyzes the sequence to obtain the slope, and finally realizes the data association according to the characteristic that the inverse cotangent value of the slope corresponds to the target's motion heading. The simulation results show that the proposed method has better association localization ability compared with the traditional method, overcomes the problem of the conventional method that the computational volume is too large when the number of observation stations and targets is large, and ensures the association correctness under a certain error. © 2025 IEEE.

关键词： Inverse problems

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Lithium-ion Batteries RUL Prediction Based on Temporal Pattern Attention 15

Lithium-ion Batteries RUL Prediction Based on Temporal Patte...

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2022 15th International Conference on Computer and Electrical Engineering, ICCEE 2022

作者： Qin, Haochen Fan, Xuexin Fan, Yaxiang Wang, Ruitian Tian, Fengyuan National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering 717 Jiefang Avenue 430033 China

Accurate prediction of battery remaining useful life (RUL) under various operating conditions is essential for battery management systems to evaluate battery reliability, reduce the risk of battery usage and provide a rationale for battery maintenance. However, RUL prediction is a challenging problem since battery degradation is a nonlinear process and is influenced by external factors. In order to improve the prediction speed and accuracy, the research proposes a new Li-ion batteries RUL prediction method based on temporal pattern attention-based, which can take into account the influence of different variables for prediction. To model time-invariant patterns across multiple time steps, it combines a gated recurrent unit (GRU), a convolutional neural network, and an attention mechanism. Battery capacity, impedance and temperature are taken as input to train the model. Experiments are validated on public datasets and the results are compared with state of art methods. The experimental results show that the proposed method achieves the lowest MAE with 8.99, which proves the effectiveness of the method. © 2022 Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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Period Energy Method to Detect Demagnetization Failure of Surface Mounted Permanent Magnet Motor with Search Coil 16th

Period Energy Method to Detect Demagnetization Failure of Su...

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： huang, Wen Hu, Jinghua National Key Laboratory of Science and Technology on Vessel Integrated Power System No.717 Jiefang Avenue Qiaokou District Wuhan China

ISBN: (纸本)9789811915314

Permanent magnet synchronous motors are widely used in major fields such as aerospace, wind power generation, high-end manufacturing, national defense, and military industry due to its many advantages. The stability of permanent magnet materials will be affected by factors such as temperature, external magnetic field, acid-base corrosion, and manufacturing defects, resulting in uniform demagnetization or partial demagnetization failures. Demagnetization fault is a unique fault of permanent magnet motor. It will reduce operating efficiency, increase torque ripple, and deteriorate vibration performance. This paper studies the change of the "period energy" in search coil caused by demagnetization. When the permanent magnet is demagnetized, the asymmetry of the rotor magnetic field makes the "period energy" in the search coil no longer zero, and its amplitude proportional to the failure degree. The equivalent surface current method is used in the calculation of the air gap magnetic field due to its intuitive physical meaning and the advantages of calculation speed. Based on the acquisition of the air gap magnetic field, the induced voltage of the search coil is obtained based on the law of electromagnetic induction and the "period energy" is calculated to diagnose magnet’s fault. The comparison with the finite element and simulation results shows that the method proposed in this paper can effectively monitor the permanent magnet demagnetization failure and quantitatively evaluate the degree of loss of magnetization. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Permanent magnets

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Characterization and prediction of tailpipe ammonia emissions from in-use China 5/6 light-duty gasoline vehicles

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Frontiers of Environmental science & Engineering 2024年第1期18卷 71-81页

作者： Lewei Zeng Fengbin Wang Shupei Xiao Xuan Zheng Xintong Li Qiyuan Xie Xiaoyang Yu Cheng Huang Qingyao Hu Yan You Ye Wu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China State Key Laboratory of Engines Tianjin UniversityTianjin 300072China China Automotive Technology and Research Center Co.Ltd. Tianjin 300300China CATARC Automotive Test Center(Guangzhou)Co.Ltd. Guangzhou 511300China State Environmental Protection Key Laboratory of Cause and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental SciencesShanghai 200233China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research InstituteMacao University of Science and TechnologyMacao SAR 999078China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China

On-road tailpipe ammonia (NH3) emissions contribute to urban secondary organic aerosol formation and have direct or indirect adverse impacts on the environment and human health. To understand the tailpipe NH3 emission characteristics, we performed comprehensive chassis dynamometer measurements of NH3 emission from two China 5 and two China 6 light-duty gasoline vehicles (LDGVs) equipped with three-way catalytic converters (TWCs). The results showed that the distance-based emission factors (EFs) were 12.72 ± 2.68 and 3.18 ± 1.37 mg/km for China 5 and China 6 LDGVs, respectively. Upgrades in emission standards were associated with a reduction in tailpipe NH3 emission. In addition, high NH3 EFs were observed during the engine warm-up period in cold-start cases owing to the intensive emissions of incomplete combustion products and suitable catalytic temperature in the TWCs. Notably, based on the instantaneous NH3 emission rate, distinct NH3–emitting events were detected under high/extra high velocity or rapid acceleration. Furthermore, NH3 emission rates correlated well with engine speed, vehicle specific power, and modified combustion efficiency, which were more easily accessible. These strong correlations were applied to reproduce NH3 emissions from China 5/6 LDGVs. The predicted NH3 EFs under different dynamometer and real-world cycles agreed well with existing measurement and prediction results, revealing that the NH3 EFs of LDGVs in urban routes were within 8.55–11.62 mg/km. The results presented here substantially contribute to improving the NH3 emission inventory for LDGVs and predicting on-road NH3 emissions in China.

关键词： NH3 instantaneous emissions Catalytic temperature Vehicle specific power Combustion efficiency Emission prediction

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Characterization of high-performance AlGaN-based solar-blind UV photodetectors

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Optoelectronics Letters 2025年第7期21卷 402-406页

作者： FU Yuting LIU Bing ZHAN Jie ZHENG Fu SUN Zhaolan College of Physics and Electronic Science Hunan University of Science and Technology Key Laboratory of Electronic Information Technology for Complex Space Systems National Space Science CentreChinese Academy of Sciences State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences

This study begins with the fabrication and simulation of high-performance back-illuminated AlGaN-based solar-blind ultraviolet（UV） photodetectors. Based on the photodetectors, a low-noise, high-gain UV detection system circuit is designed and fabricated, enabling the detection, acquisition, and calibration of weak solar-blind UV signals. Experimental results demonstrate that under zero bias conditions, with a UV light power density of 3.45 μW/cm2at 260 nm, the sample achieves a peak responsivity（R） of 0.085 A·W-1, an external quantum efficiency（EQE） of 40.7%, and a detectivity（D*） of 7.46×1012cm·Hz1/2·W-1. The system exhibits a bandpass characteristic within the 240—280 nm wavelength range, coupled with a high signal-to-noise ratio（SNR） of 39.74 dB.

关键词： A

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Numerical simulation of the effect of Faraday cage on the inductively coupled plasma discharge

Numerical simulation of the effect of Faraday cage on the in...

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2024 International Conference on Aerospace, Mechanical and Materials Engineering, AMME 2024

作者： Lei, Fan Zhang, Zhaoyang Wei, Xiaolong Han, Xinmin Wu, Hongzhi Liu, Zhiwei School of Electrical and Control Engineering Shaanxi University of Science and Technology Xi'an710016 China National Defense Key Laboratory of Aeronautical Plasma Dynamics Air Force Engineering University Xi'an710038 China China Academy of Aerospace Science and Innovation Beijing100032 China

Taking inductively coupled plasma (ICP) as the research object, a method of increasing the electron density of ICP by Faraday cage electromagnetic shielding is proposed. At the same time, the introduction of the Faraday cage can effectively prevent the electromagnetic interference caused by the discharge coil, which is helpful in reproducing the real near-space plasma environment in the laboratory. Based on COMSOL Multiphysics, a two-dimensional inductively coupled plasma discharge model was constructed, and the effect of the Faraday cage on ICP discharge parameters was comparatively studied. The simulation results show that the Faraday cage can effectively shield the electromagnetic interference caused by the discharge coil. At the same time, the Faraday cage can increase the electron density and the electron temperature of the plasma to a certain extent, and the plasma is evenly distributed in this case. With the increase of discharge power, the electromagnetic shielding effect of the Faraday cage is still effective, and the effect on the plasma electron density is more obvious. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Inductively coupled plasma

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基于正交质谱的N-糖组谱揭示哈夫病潜在病原学

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Engineering 2023年第7期26卷 63-73,I0003页

作者：刘思刘圆圆林佳静刘笔锋何振宇吴晓旻刘欣 The Key Laboratory for Biomedical Photonics of the MOE at Wuhan National Laboratory for Optoelectronics–Hubei Bioinformatics and Molecular Imaging Key Laboratory Systems Biology ThemeDepartment of Biomedical EngineeringCollege of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Wuhan Center for Disease Control&Prevention Wuhan 430015China

食用煮熟的小龙虾可能导致哈夫病(HD),该病被认为是由不明毒素引起的,而病因尚不清楚。N-糖组的剖析将促进破译疾病的分子机制,而HD相关的糖基化从未被探索过。2019-2020年期间,本研究团队招募了来自武汉市疾病预防控制中心的90份HD患... 详细信息

食用煮熟的小龙虾可能导致哈夫病(HD),该病被认为是由不明毒素引起的,而病因尚不清楚。N-糖组的剖析将促进破译疾病的分子机制,而HD相关的糖基化从未被探索过。2019-2020年期间,本研究团队招募了来自武汉市疾病预防控制中心的90份HD患者和对照组血清样本。本文中,采用基于高通量的正交质谱对HD中血清和血清衍生的IgG的N-糖组谱进行了表征。数据显示,HD与总血清糖蛋白的核心岩藻糖基化和单半乳糖醇化升高有关。血清IgG水平是HD患者的良好指标。此外,IgG的差异半乳糖基化和唾液酸化与HD密切相关。值得注意的是,IgG1和IgG2的半乳糖基化和唾液酸化的变化具有亚类特异性。有意义的是,IgG2或IgG3/4的唾液酸化和半乳糖基化改变与HD的临床标志物密切相关。本研究表明差异化IgG N-糖基化与HD的关联,为这种罕见疾病的病因提供了新的见解。

关键词： Haff disease Serum Immunoglobulin G Glycosylation Disease pathogenesis

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INFLUENCE OF MOTOR AIR-GAP ECCENTRICITY ON THE VIBRATION OF ROTOR WITH ASYMMETRIC STIFFNESS 28

INFLUENCE OF MOTOR AIR-GAP ECCENTRICITY ON THE VIBRATION OF ...

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28th International Congress on Sound and Vibration, ICSV 2022

作者： Hu, Yuchao Wang, Xing Li, Wenyin Hu, Jinghua National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Hubei Province Wuhan430033 China

ISBN: (纸本)9789811850707

In motors, the electromagnetic forces and mechanical forces are usually considered as independent vibration sources, and their coupling mechanism is seldom investigated. In this paper, the influence of unbalanced magnetic pull (UMP) caused by motor air-gap eccentricity on mechanical force excitation of rotor is studied for a permanent magnet synchronous motors (PMSM). The components of electromagnetic forces in multiple pole-pairs motor with a static eccentricity in air-gap is firstly analyzed. Considering the mass eccentricity and asymmetric stiffness of rotor, a nonlinear dynamics model with UMP is established. Multi-scale method is used to solve the nonlinear equation. The results reveal that the component of double rotation frequency vibration (2X) occurs when considering asymmetric stiffness. However, the amplitude of 2X component corresponds to the UMP force. Experiments are carried out on a six pole-pairs permanent magnet synchronous motor. The result shows that the amplitude of 2X component has a positive correlation within small air-gap eccentricity, which verifies the analytical conclusions. © International Institute of Acoustics and Vibration (IIAV), 2022.

关键词： Stiffness

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