检索结果-内蒙古大学图书馆

2019 IEEE International Conference on Power, Intelligent Computing and systems, ICPICS 2019

作者： Hu, Zhenxing Ding, Wei Yang, Tao Luo, Xiaokang Tao, Yaqin Shen, Zeliang Southwest Electric Power Design Institute Co. Ltd. China Power Engineering Consulting Group Chengdu China State Grid Chongqing Jangbei Power Supply Company Chongqing China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728137209

The low-voltage distribution system of thermal power plants has a large auxiliary power load and is vulnerable to electromagnetic influence, so its lightning protection is relatively complex. This paper takes Xishui Substation as the research object, and uses CDEGS software to build its buildings and grounding grid model, and calculates the shunt of lightning current in branch conductors, indoor magnetic field distribution and grounding grid potential distribution of thermal power plants when lightning strikes buildings. The results show that the shunt coefficient of the thermal power plant buildings basically meets the specification requirements. The lightning that strikes buildings will not cause harm to indoor equipment near the middle. Lightning flowing through buildings and leaking into the ground will threaten its low-voltage distribution system with ground potential counterattack. This provides data basis for electromagnetic safety assessment of low-voltage distribution system in thermal power plants, and is of great significance for improving reliable operation of low-voltage distribution system in thermal power plants. © 2019 IEEE.

关键词： Buildings

来源：评论

学校读者我要写书评

暂无评论

Study of Electromagnetic Influence on the Low-voltage Secondary Cables when Lightning Strikes Thermal Power Plants

Study of Electromagnetic Influence on the Low-voltage Second...

引用

2019 IEEE International Conference on Power, Intelligent Computing and systems, ICPICS 2019

作者： Hu, Zhenxing Ding, Wei Yang, Tao Luo, Xiaokang Tao, Yaqin Shen, Zeliang Southwest Electric Power Design Institute Co. Ltd. China Power Engineering Consulting Group Chengdu China State Grid Chongqing Jiangbei Power Supply Company Chongqing China State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728137209

When solving the electromagnetic compatibility problem of low-voltage distribution system in thermal power plants, it is found that the current protection specifications for secondary cables in some conventional substations and common civil buildings are not suitable for thermal power plants, and there is a lack of reference standards for lightning protection data of secondary cables in thermal power plants. Therefore, this paper takes Xishui Substation as the research object, uses CDEGS software to build a three-phase low-voltage distribution system combined with the structural characteristics of large-scale ground screen, overhead cable bridge, building group and others of thermal power plants, and completes the modeling of its buildings, grounding grid, transformer and secondary overhead cable bridge. According to the layout of two buildings in the low-voltage distribution system, the overvoltage of the secondary power cable generated when the buildings are struck by lightning is calculated. The results show that the lightning strike will cause great electromagnetic influence on the secondary equipment. This provides data support for the layout design and protection of secondary cables in thermal power plants, and is of great significance for improving the insulation coordination capability of secondary systems. © 2019 IEEE.

关键词： Buildings

来源：评论

学校读者我要写书评

暂无评论

Visual Detection Method for Spatial Transverse Vibration Displacement of Wire Rope in Multi-point Synchronous Hoisting system

Visual Detection Method for Spatial Transverse Vibration Dis...

引用

Chinese Automation Congress (CAC)

作者： Nana Fan Fang Yang Jishun Li Shengyong Zou Henan Key Laboratory for Machinery Design and Transmission System School of Mechatronics Engineering Henan University of Science and Technology Luoyang China Henan Key Laboratory for Machinery Design and Transmission System State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China Henan Key Laboratory for Machinery Design and Transmission System School of Mechatronics Engineering Henan University of Science and Technology State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China

In order to detect the healthy running state of wire rope efficiently and accurately in multi-point synchronous hoisting system, this paper proposed a method based on orthogonal image technology to detect the spatial transverse vibration displacement of wire rope. Firstly, two sets of images were captured synchronously at the same frequency by two high-speed video cameras where set vertically each other. Secondly, binarization and calculation of actual vibration displacement of wire rope were carried out with LabVIEW, and recording the real-time vibration of wire rope. At last, empirical mode decomposition method was used to remove the periodic excitation caused by the displacement of rope-arranging. The spatial vibration shape of the wire rope and the vibration trajectory in the cross section of the wire rope were obtained by fitting these data on Matlab. The experimental results show that this method can accurately reflect the law of the spatial transverse vibration of wire rope. It can provide technical support for the study of the detection and evaluation of the safety parameters of the hoisting system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Error analysis and control of the acoustic overlapping mesh technique

引用

Applied Acoustics 2025年 238卷

作者： Wang, Youjiang Yang, Zhuangtao Liu, Zhenghao Ding, Yongle Zhang, Tao Zhang, Daiyu Yu, Long Key Laboratory of Marine Intelligent Equipment and System Ministry of Education Shanghai200240 China School of Ocean & Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Kunming Branch of the 705 Research Institute China State Shipbuilding Corporation Limited Kunming China School of Marine Science and Technology Northwestern Polytechnical University Shaanxi Xi'an China Marine Design and Research Institute of China Shanghai China Xi'an Precision Machinery Research Institute Xi'an China School of Naval Architecture & Ocean Engineering Jiangsu University of Science and Technology Zhenjiang212003 China

Accurate and affordable methods for predicting the underwater radiated noise of ships will facilitate the development of effective noise control techniques. The acoustic overlapping mesh (AOM) technique, which enables the direct integration of volumetric noise terms in the Lighthill and FWH (Ffowcs Williams and Hawking) acoustic analogies, is a promising way to obtain such a method. In this paper, we improved the AOM technique by extending the overlapping mesh idea to the surface noise terms, further reducing the acoustic computational burden. Meanwhile, three causes for numerical errors of the AOM technique are identified and analyzed theoretically and numerically, leading to preliminary guidelines for choosing the acoustic mesh dimensions. The results suggest that keeping the cell-size-to-wavelength ratio (h/λ) lower than 0.05 avoids a sharp increase of the error from Cause-I, and keeping h/λ lower than 0.005 helps maintain this error less than 1 dB. The errors from the other causes (Cause-II and III) can be maintained less than 1 dB by keeping the distance-to-cell-size ratio (r/h) larger than 7.97. The simulation case also shows that the AOM technique reduces the acoustic computational time by more than 99% and 90% for the total and surface noise, respectively, while maintaining a noise prediction difference of around 1 dB. Using a non-uniform acoustic mesh instead of the uniform one helps achieve a much better with a similar acoustic computational time. © 2025 Elsevier Ltd

关键词： Numerical methods

来源：评论

学校读者我要写书评

暂无评论

Deep neural network based interpolation of sparse samples for time-dense power load forecasting

Deep neural network based interpolation of sparse samples fo...

引用

International Conference on Computer Engineering and Applications (ICCEA)

作者： Bo Li Ruifeng Zhao Jiangang Lu Kuo Xin Jinhua Huang Guanqiang Lin Jinrong Chen Xueyue Pang Shunxin Wu Electric Power Dispatching and Control Center of Guangdong Power Grid Co. Ltd. Guangzhou Guangdong China Electric Power Dispatching and Control Center of China Southern Power Grid Co. Ltd. Guangzhou Guangdong China Electric Power Research Institute of Guangdong Power Grid Co. Ltd. Guangzhou Guangdong China Huizhou Power Supply Bureau of Guangdong Power Grid Co. Ltd. Huizhou Guangdong China Foshan Power Supply Bureau of Guangdong Power Grid Co. Ltd. Foshan Guangdong China China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd. Guangzhou Guangdong China State Key Laboratory of Power Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China

Large amount of power load data with high-sampling rate plays a crucial role in the training of time-dense power load forecasting network. However, in many cases, there is a large amount of data with low-sampling rate, which can't directly train a time-dense forecasting network. Therefore, this paper proposes a deep learning based dataset interpolation method, which uses the available high-sampling rate power load datasets to train a dataset interpolation network, then interpolates the low--sampling rate datasets with trained network to obtain high-sampling rate datasets, and finally uses the interpolated datasets for time-dense forecasting network training. The results show that the data obtained based on the method proposed in this paper fits the ground-truth closer than the traditional interpolation, and the results of the network trained based on this dataset are more accurate in the subsequent forecasting tasks.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Stress Simulation Study on a Novel Combination String of Transmission Line Insulators 2

Stress Simulation Study on a Novel Combination String of Tra...

引用

2019 2nd International Conference on Manufacturing technology, Materials and Chemical Engineering, MTMCE 2019

作者： Wang, Dapeng Xie, Tao Yuan, Zuhui Niu, Jingping Xia, Wei Bao, Yang State Grid Chizhou Power Supply Company Chizhou247000 China State Grid Anhui Electric Power Co. Ltd Hefei230601 China Anhui Huadian Engineering Consulting and Design Co. Ltd Hefei230022 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

The insulator string mainly plays a role of fixing wire and preventing the current from returning to the ground in the power transmission and transformation project. In order to compress the corridor width of the transmission line and make it convenient for breaking line, we proposed a novel structure in which the V-type fittings and the tensile insulator string are optimally combined. In this paper, the mathematical model of mechanical analysis for the structure is established. According to the equilibrium conditions of space force system, the factors affecting the stress of the structure are analysed. In addition, a simulation model is built in the finite element analysis software. The stress distributions of the new structure by setting two installation angles are calculated and the special parts with weak mechanical properties in the new structure are explored based on the generated stress cloud diagram. We compare the maximum value of the von Mises equivalent stress in the two arrangements. A conclusion of better than 45° at a mounting arrangement angle of 50° was obtained. The research results provide a theoretical reference for further optimization design and installation of the combined structure in the future. © Published under licence by IOP Publishing Ltd.

关键词： Electric lines

来源：评论

学校读者我要写书评

暂无评论

On the Adaptive Damper system of the Electric reactor Based on Magnetorheological Fluid

引用

Journal of Physics: Conference Series 2021年第1期1871卷

作者： Tian Tian Yuan Zhou Qiong Yang Jingang Wang Changjian Xu Department Chongqing Electric Power Design Institute Co. Ltd Chongqing 401121 China Department State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing 400044 China

The electric reactor will generate irregular electromagnetic vibration during the onsite operation of substation. If so for a long time, it will cause problems such as broken indoor floor and loose connecting parts, endanger the building structure or damage to the building, thus leading to waste of land resources in indoor substation. In order to effectively suppress the irregular electromagnetic vibration of the electric reactor, this paper proposed an adaptive damper system of the electric reactor based on magnetorheological fluid to realize the all-around vibration suppression of reactor field vibration. This system placed the homemade damper in the center of each surface of the reactor, and used external filter circuit and signal amplification circuit to process the vibration signal and transform it into electrical signal, which controlled the single-chip microcomputer to regulate the damper to output the damping force, forming an adaptive damper system based on the magnetorheological fluid. Then, the good performance of vibration reduction of the system was verified by the onsite vibration reduction test of the reactor. And the adaptive regulate ability of the system is superior and is of good engineering application value.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A novel method to increase energy density of permanent magnet machine based on multi-physical field analysis

引用

UPB Scientific Bulletin, Series D: Mechanical Engineering 2020年第4期82卷 79-92页

作者： Zheng, Qingchun Zhao, Yangyang Zhu, Peihao Wang, Sen Liu, Jingna Ma, Wenpeng Li, Xiang Xiao, Yinhong Wang, Naixin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China School of Computer Science Tianjin University of Technology Tianjin300384 China School of Automation Shenyang Institute of Engineering Shenyang110136 China Baoding Power Supply Company Hebei Electric Power Company State Grid Corporation of China Baoding071000 China

As an important component of all-electric aircraft, the main propulsion machine is developing towards high energy density, high efficiency and high fault tolerance. In order to improve the energy density of main propulsion machine for all-electric aircraft, a novel approach, which can be used for excellent performance improvement of electric machine of all-electric aircraft, is reported in this paper. The analytical formula of energy density is put forward and the design method of high energy density permanent magnet machine is presented. A high energy density machine with rated power of 30kW is designed, and the electromagnetic field simulation analysis, strength and stress structure verification, temperature field simulation analysis and multi-physical field coupling analysis are obtained. A prototype is developed, the experiment platform is established, and experiments are performed. The energy density of main propulsion machine designed is up to 21kW·N·m/kg2, and the index is increased by 3.2 times. The optimal method based on the multi-physical field analysis can be also applied to other high energy density machines. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Electromagnetic fields

来源：评论

学校读者我要写书评

暂无评论

Deep learning-based air temperature mapping byfusing remote sensing, station, simulation and socioeconomic data

arXiv

引用

arXiv 2020年

作者： Shen, Huanfeng Jiang, Yun Li, Tongwen Cheng, Qing Zeng, Chao Zhang, Liangpei School of Resource and Environmental Sciences Wuhan University Wuhan430079 China School of Urban Design Wuhan University Wuhan430079 China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan430079 China Collaborative Innovation Center of Geospatial Technology Wuhan430079 China Key Laboratory of Geographic Information System Ministry of Education Wuhan University Wuhan430079 China

Air temperature(Ta)isanessential climatologicalcomponentthatcontrolsand influences variousearth surface *** this study, we makethe first attempttoemploy deep learning for Ta mapping mainly based on space remote sensing and ground station *** that Ta varies greatly in space and time and is sensitive tomany factors, assimilation dataand socioeconomicdata are also included for a multi-source data fusion based ***, a5-layers structured deep belief network(DBN) isemployed to better capturethe complicatedand non-linear relationships between Taand different ***-wise pre-trainingprocess foressentialfeaturesextraction and fine-tuningprocess forweight parametersoptimization ensure the robust prediction of Ta spatio-temporal distribution. The DBN model was implemented for 0.01°daily maximum Ta mapping across China. The ten-fold cross-validation resultsindicate that the DBN model achieves promisingresults with the RMSEof1.996°C, MAEof1.539°C, and Rof 0.986at the national *** with multiple linear regression (MLR), back-propagation neural network (BPNN) and random forest (RF)method, the DBN modelreduces the MAE values by 1.340°C, 0.387°Cand0.222°C,*** analysis on spatialdistribution and temporal tendency of predictionerrors both validate the great potentials of DBN inTa estimation. Copyright © 2020, The Authors. All rights reserved.

关键词： Atmospheric temperature

来源：评论

学校读者我要写书评

暂无评论

Erratum to: The formation mechanism of aqueous hydrogen peroxide in a plasma-liquid system with liquid as the anode

引用

The European Physical Journal D 2020年第7期74卷 1-2页

作者： Lin, Jiao He, Xinyi Chen, Qiang Xiong, Qing Li, Junshuai Wang, Xin Chen, Guolong Liu, Qing Huo Ostrikov, Kostya (Ken) Institute of Electromagnetics and Acoustics Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Department of Electronic Science Xiamen University Xiamen P.R. China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing P.R. China Key Laboratory of Special Function Materials & Structure Design of the Ministry of Education School of Physical Science & Technology Lanzhou University Lanzhou P.R. China Department of Electrical and Computer Engineering Duke University Durham USA Institute for Future Environments and School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Brisbane Australia CSIRO-QUT Joint Sustainable Processes and Devices Laboratory Commonwealth Scientific and Industrial Research Organization Lindfield Australia

We find that we made a mistake in the estimation of the H2O2 concentration by the colorimetric method in our previous paper (J. Lin et al., Eur. Phys. J. D (2020) 74: 80) [1].

关键词： Atomic and Molecular Collisions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：