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2024 IEEE International Conference on Sensing, Diagnostics, Prognostics, and Control, SDPC 2024

作者： Gao, Shuai Su, Kewei Li, Zhe Xu, Lang Pu, Huayan Han, Qinkai Chongqing University State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing China Cssc System Engineering Research Institute China State Shipbuilding Corporation Limited Beijing China Tsinghua University State Key Laboratory of Tribology Department of Mechanical Engineering Beijing China

ISBN: (纸本)9798350388855

The rapid development of high-end equipment in industries such as electric vehicles and high-speed industrial robots has increasingly high requirements for the dynamic performance, service life, stability, and other aspects of high-speed rolling bearings. The dynamic performance of the cage directly affects the stability of the bearings and even the entire unit. A dynamic model for the cage of rolling element bearings has been proposed. The effect of guidance type and guiding clearance on the dynamic stability of the cage has been discovered. Four indicators for evaluating the stability of the cage have been developed based on the whirling orbit of the cage and the transient skidding state of the bearing. The results indicate that there is a deviation in the optimal guidance clearance between the outer ring guidance and the inner ring guidance. Decreasing the guiding clearance in a certain range is beneficial for improving the stability of the cage. © 2024 IEEE.

关键词： Roller bearings

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Bio-robotics research for non-invasive myoelectric neural interfaces for upper-limb prosthetic control:a 10-year perspective review

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国家科学评论（英文版） 2023年第5期10卷 32-52页

作者： Ning Jiang Chen Chen Jiayuan He Jianjun Meng Lizhi Pan Shiyong Su Xiangyang Zhu National Clinical Research Center for Geriatrics West China Hospitaland Med-X Center for ManufacturingSichuan UniversityChengdu 610041China State Key Laboratory of Mechanical System and Vibration and Institute of RoboticsShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical EngineeringTianjin UniversityTianjin 300350China Institute of Neuroscience Université Catholique LouvainBrussel B-1348Belgium

A decade ago,a group of researchers from academia and industry identified a dichotomy between the industrial and academic state-of-the-art in upper-limb prosthesis control,a widely used bio-robotics *** proposed that four key technical challenges,if addressed,could bridge this gap and translate academic research into clinically and commercially viable *** challenges are unintuitive control schemes,lack of sensory feedback,poor robustness and single sensor ***,we provide a perspective review on the research effort that occurred in the last decade,aiming at addressing these *** addition,we discuss three research areas essential to the recent development in upper-limb prosthetic control research but were not envisioned in the review 10 years ago:deep learning methods,surface electromyogram decomposition and open-source *** conclude the review,we provide an outlook into the near future of the research and development in upper-limb prosthetic control and beyond.

关键词： electromyography prosthetic control sensory feedback EMG decomposition robustness deep learning

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Health benefits from the rapid reduction in ambient exposure to air pollutants after China's clean air actions:progress in efficacy and geographic equality

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National Science Review 2024年第2期11卷 103-113页

作者： Tao Xue Ruohan Wang Meng Wang Yanying Wang Dan Tong Xia Meng Conghong Huang Siqi Ai Fangzhou Li Jingyuan Cao Mingkun Tong Xueqiu Ni Hengyi Liu Jianyu Deng Hong Lu Wei Wan Jicheng Gong Shiqiu Zhang Tong Zhu Institute of Reproductive and Child Health National Health Commission Key Laboratory of Reproductive Health/Department of Epidemiology and Biostatistics Ministry of Education Key Laboratory of Epidemiology of Major Diseases(PKU) School of Public Health Peking University Health Science Centre State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management and Center for Environment and Health Peking University Advanced Institute of Information Technology Peking University Department of Epidemiology and Environmental Health School of Public Health and Health ProfessionsUniversity at Buffalo State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking University Department of Earth System Science Tsinghua University School of Public Health Key Laboratory of Public Health Safety of the Ministry of Education and Key Laboratory of Health Technology Assessment of the Ministry of HealthFudan University College of Land Management Nanjing Agricultural University National&Local Joint Engineering Research Center for Rural Land Resources Use and Consolidation Clean Air Asia

Clean air actions （CAAs） in China have been linked to considerable benefits in public ***,whether the beneficial effects of CAAs are equally distributed geographically is *** high-resolution maps of the distributions of major air pollutants (fine particulate matter[PM2.5]and ozone[O3]) and population,we aimed to track spatiotemporal changes in health impacts from,and geographic inequality embedded in,the reduced exposures to PM2.5and O3from 2013 to *** used a method established by the Global Burden of Diseases *** analyzing the changes in loss of life expectancy（LLE） attributable to PM2.5and O3,we calculated the gain of life expectancy （GLE） to quantify the health benefits of the air-quality ***,we assessed the geographic inequality embedded in the GLE using the Gini index （GI）.Based on risk assessments of PM2.5and O3,during the first stage of CAAs（2013 to 2017）,the mean GLE was 1.87 *** of the sum of the GLE was disproportionally distributed in about one quarter of the population exposed （GI 0.44）.During the second stage of CAAs（2017 to 2020）,the mean GLE increased to 3.94 months and geographic inequality decreased （GI 0.18）.According to our assessments,CAAs were enhanced,from the first to second stages,in terms of not only preventing premature mortality but also ameliorating health *** enhancements were related to increased sensitivity to the health effects of air pollution and synergic control of PM2.5and *** findings will contribute to optimizing future CAAs.

关键词： clean air action public health inequality fine particulate matter ozone

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Silicon photonic integrated interrogator for fiber-optic distributed acoustic sensing

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Photonics Research 2024年第3期12卷 465-473页

作者： ZHICHENG JIN JIAGENG CHEN YANMING CHANG QINGWEN LIU ZUYUAN HE State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Distributed acoustic sensing(DAS)technology has been a promising tool in various ***,the large size and relatively high cost of DAS equipment composed of discrete devices restrict its further popularization to some degree,and the photonic integration technology offers a potential *** this paper,we demonstrate an integrated interrogator for DAS on the silicon-on-insulator(SOI)*** design of the chip revolves around a Mach–Zehnder modulator(MZM)transmitter and a dual-quadrature and dualpolarization coherent *** integrated interrogator supports multiple DAS schemes,including the time-gated digital optical frequency domain reflectometry(TGD-OFDR),which is adopted for system performance evaluation.59■strain resolution in 12.1km sensing fiber with 1.14 m spatial resolution(SR)is ***,along 49.0 km sensing fiber,81■strain resolution with 3.78 m SR is *** results show that the integrated interrogator has comparable performance to the discrete DAS *** the best of our knowledge,this is the first dedicated on-chip DAS interrogator,which validates the effectiveness of the blend of photonics integration and DAS technology.

关键词： fiber polarization modulator

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Effect of Low Frequency Electrical Aging on Conductive Current Characteristics of Cross-Linked Polyethylene Films 18th

Effect of Low Frequency Electrical Aging on Conductive Curre...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Huang, Jiyu Zhou, Yuanxiang Chen, Jianning Jiang, Guimin Zhu, Xiaoqian Wind Solar Storage Division of State Key Lab of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi830047 China State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9789819714469

With the construction of offshore wind power projects, cross-linked polyethylene (XLPE) submarine cables are gradually applied to low frequency power transmission. However, the electrical aging characteristics and mechanisms of XLPE at low frequency remain unclear. In order to study the effect of low frequency electrical aging on the electrical conductivity current characteristics of XLPE and its difference from power frequency electrical aging, accelerated electrical aging experiment of XLPE films are conducted under applied AC voltage of 20 Hz and 50 Hz. The electrical conductivity current characteristics of XLPE films are measured at different electric field strengths after 3, 6 and 9 days of electrical aging. The results show that the conductive currents of XLPE increased with the growth of accelerated electrical aging time at both low frequency and power frequency. The conductivity current increases from 6 pA to 147 pA after 9 d of aging at power frequency, and from 6 pA to 307 pA at low frequency. The conductive current increases more at low frequency than at power frequency, the 20 Hz conductivity current is 80%, 63% and 52% higher than the 50 Hz conductivity current at 3 d, 6 d and 9 d aging, respectively. In addition, the electric field remains above the charge injection threshold for a longer period of time in a single cycle at low frequency, so the low frequency voltage enhances the charge carrier mobility and space charge trapping probability in the insulating medium, generating more thermionic and causing more polymer chain breaks, resulting in higher conductivity currents under low frequency aging compared with power frequency. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Electric power transmission

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Toward Earth system modeling with resolved clouds and ocean submesoscales on heterogeneous many-core HPCs

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National Science Review 2023年第6期10卷 153-167页

作者： Shaoqing Zhang Shiming Xu Haohuan Fu Lixin Wu Zhao Liu Yang Gao Chun Zhao Wubing Wan Lingfeng Wan Haitian Lu Chenling Li Yanfei Liu Xiaojing Lv Jiayu Xie Yangyang Yu Jun Gu Xuantong Wang Yan Zhang Chenhui Ning Yunlong Fei Xiuwen Guo Zhaoying Wang Xue Wang Zhenming Wang Binglin Qu Mingkui Li Haoran Zhao Yingjing Jiang Guang Yang Lv Lu Hong Wang Hong An Xin Zhang Yu Zhang Wentao Ma Fujiang Yu Jing Xu Xiaopei Lin Xueshun Shen Key Laboratory of Physical Oceanography Ministry of Education/Institute for Advanced Ocean Study/Frontiers Science Center for Deep Ocean Multispheres and Earth System (DOMES) College of Oceanic and Atmospheric Sciences Ocean University of China Laoshan Laboratory Ministry of Education Key Lab for Earth System Modeling and Department of Earth System Science Tsinghua University National Supercomputing Center in Wuxi Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China School of Computer Science and Technology University of Science and Technology of China CEAKJ ADPRHexa Inc. National Marine Environmental Forecasting Center State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources Chinese Academy of Meteorological Sciences The Center of Earth System Modeling and Prediction China Meteorological Administration

With the aid of the newly developed 'Sunway' heterogeneous-architecture supercomputer,which has world-leading HPC(high-performance computer) capability,a series of high-resolution coupled Earth system models(SW-HRESMs) with up to 5 km of atmosphere and 3 km of ocean have been *** models can meet the needs of multiscale interaction studies with different computational *** we describe the progress of SW-HRESMs development,with an overview of the major advancements made by the international Earth science community in *** also show the preliminary results of SW-HRESMs with regard to capturing major weather-climate extremes in the atmosphere and ocean,stressing the importance of permitted clouds and ocean submesoscale eddies in modeling tropical cyclones and eddy-mean flow interactions,and paving the way for further model development to resolve finer scales with even higher resolution and more realistic ***,in addition to increasing model resolution,the development procedure for a non-hydrostatic cloud and ocean submesoscale resolved ESM is discusse d,laying out the major scientific directions of such a huge modeling advancement.

关键词： high-resolution Earth system models heterogeneous supercomputer cloud and submesoscale resolving weather-climate extremes finer cross-scale interactions

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Physical mechanism of the rapid increase in intense and long-lived extreme heatwaves in the Northern Hemisphere since 1980

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Science China Earth Sciences 2024年第7期67卷 2103-2121页

作者： Yuqing WANG Wen ZHOU Chunzai WANG Key Laboratory of Polar Atmosphere-ocean-ice System for Weather and Climate of the MOE Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric SciencesFudan UniversityShanghai 200438China Key Laboratory for Polar Science of the MNR Polar Research Institute of ChinaShanghai 201209China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Global Ocean and Climate Research Center South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Since 1980,both the intensity and duration of summer heatwaves in the middle and high latitudes of the Northern Hemisphere have significantly increased,leading this region to become a critical area for a significant increase in the frequency of intense and long-lived extreme *** found that stronger and more persistent high-pressure systems and lower soil moisture before the events were the main drivers of intense and long-lived extreme heatwaves in western Europe and the middle and high latitudes of North ***,in eastern Europe and Siberia,lower cloud cover before events is also a main driver of this type of extreme heatwave,in addition to the above *** factors are coupled with each other and can change heatwave intensity and duration by influencing surface radiation processes during *** the self-organizing map classification method,we found that 6 weather patterns with increased frequency,intensity,and duration were the main dynamic reasons leading to the increase in intense and long-lived extreme heatwaves after *** addition,the decrease in summer average soil moisture in most areas of the mid-high latitudes of the Northern Hemisphere and the decrease in average cloud cover in eastern Europe and Siberia are found to be the main thermodynamic reasons leading to the increase in these extreme heatwaves.

关键词： High intensity Long duration Extreme heatwaves High pressure system Soil moisture Cloud cover

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PI2-CMA Based Trajectory Planning Method for the Tractor-Trailer Vehicle 6

PI2-CMA Based Trajectory Planning Method for the Tractor-Tra...

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6th IEEE International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2023

作者： Wang, You Wang, Zehao Wang, Jingchuan Guo, Rui Xiao, Peng Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Institute of Medical Robotics and Department of Automation Shanghai200240 China State Grid Intelligence Technology CO. LTD China

ISBN: (纸本)9798350325485

The motion primitive-based state lattice trajectory planning method has been widely used in the field of trajectory planning. However, due to the limitations of the search space and resolution of motion primitives, and the lack of consideration of scenario information during offline generation of motion primitives, the tractor-Trailer vehicles can easily fall into "jackknife phenomenon"when making large pose adjustments in narrow scenarios, which brings dilemma for trajectory planning. In this paper, a trajectory planning algorithm is proposed based on a general model of tractor-Trailer vehicle, which combines global planning and local optimization. The method first generates a series of motion primitives, including forward and backward driving conditions, and then an A based global state lattice planner is used to obtain a planning result, which is imported as the initial solution into the local trajectory optimizer based on PI2-CMA (Path Integral Policy Improvement with Covariance Matrix Adaptation) algorithm and dynamic potential method. Experiments show that this method significantly improves the performance in the obstacle avoidance, "jackknife phenomenon"avoidance and curvature compared to traditional motion primitive-based state lattice planning methods. © 2023 IEEE.

关键词： Trajectories

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Operational Reliability Modeling and Assessment of Battery Energy Storage Based on Lithium-ion Battery Lifetime Degradation

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Journal of Modern Power systems and Clean Energy 2022年第6期10卷 1738-1749页

作者： Lin Cheng Yuxiang Wan Yanglin Zhou David Wenzhong Gao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijingChina Department of Electrical and Computer Engineering University of DenverDenverUSA IEEE

Battery energy storage(BES)systems can effectively meet the diversified needs of power system dispatching and assist in renewable energy *** reliability of energy storage is essential to ensure the operational safety of the power ***,BES systems are composed of battery *** suggests that BES performance depends not only on the configuration but also on the operating state over different lifetime *** lack of safety and reliability is the main bottleneck preventing widespread applications of BES ***,a reliability assessment algorithm and a weak-link analytical method for BES systems are proposed while considering battery lifetime ***,a novel lithium-ion battery model is proposed to identify the degradation rate of solid electrolyte interphase film formation and capacity *** impacts of different operating conditions are considered in stress factor ***,a reliability assessment algorithm for a BES system is introduced based on a universal generating *** innovative weak-link analytical method based on the reliability importance index is proposed that combines the evaluation results of state-oriented and state-change-oriented indexes through an entropy weight *** model,algorithm,indexes,and the usefulness are demonstrated in case studies based on aging test data and actual bus operating *** results demonstrate the effects of the battery status and working conditions on BES ***-link analysis is also used to assist BES systems in avoiding short-board batteries to achieve long lifetimes and efficient operation.

关键词： Battery energy storage lifetime degradation operational reliability capacity plummeting weak-link analysis

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Study on the influencing factors to reduce the recovery time of superconducting tapes and coils for the DC superconducting fault current limiter applications

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High Voltage 2022年第3期7卷 483-495页

作者： Bin Xiang Wenqing Wang Hongxu Li Lei Gao Zhiyuan Liu Yingsan Geng Jianhua Wang Youping Tu Department of Electrical Engineering State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina

Superconducting fault current limiters(SFCLs)are important in improving the stability of electrical power ***,the existing resistive-type DC SFCL has a long re-covery time,which cannot meet the requirements of power system ***,it is necessary to investigate the methods of reducing recovery time of *** the simulations on superconducting tapes,there is a lack of investigation about the effects of design factors of superconducting tapes and coils such as material,thickness,coil radius,coil winding method on recovery *** objective of this study is to obtain the effects of material and geometric properties of superconducting tapes and coils on recovery characteristics and obtain methods to reduce the recovery *** recovery times under different conducting currents are also compared by simulations and exper-iments to verify simulation *** maximum error is below 40%and most of the cases have an error below 10%.Besides,by increasing tape thickness,the recovery time can be reduced by 22%.Tape materials and coil winding methods can be designed ac-cording to the auto-reclosure and current-limiting requirements of the power *** research provided directions for the design of superconducting tape and super-conducting coil for resistive-type DC SFCLs.

关键词： fault winding conducting

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