检索结果-内蒙古大学图书馆

2024 International Annual Conference on Complex Systems and Intelligent Science, CSIS-IAC 2024

作者： Huang, Jianhang Jia, Lijie Zhou, Yitian Wang, Shuo Zhang, Xinliang Xu, Xiaozhuo School of Electrical Engineering and Automation Henan Polytechnic University Henan International Joint Laboratory of Direct Drive and Control of Intelligent Equipment Jiaozuo China Zhoushan Yangwangnaxin Technology Co. Zhoushan China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo China

ISBN: (纸本)9798331504755

In deep network-based steel surface defect detection models, using only serial convolution operations can hinder the detection of small defects due to insufficient multi-scale detail information. To address this issue, a detection model based on joint multi-dimensional atrous convolution (JMDC) is proposed. By introducing atrous convolution with various kernel sizes into the feature extraction layer, a multi-channel parallel convolution chain is constructed to capture multi-scale defect features, enhancing the detail perception. Subsequently, a JMDC operator, generated from the residual network, fuses these features and establishes a channel constraint to improve the training stability and global feature extraction. Then by integrating the JMDC into the multi-level feature extraction layers, the improved YOLOv5 realizes the detection enhancement for the multi-scale defects. Correspondingly, the k-means algorithm is adopted to generate adaptive multi-scale anchor boxes with the reduction of the positional deviation. Experimental results show that the proposed approach has provided a detection accuracy of 81.7% on the NEU-DET dataset, yielding a significant improvement on the defect detection, especially for small targets. © 2024 IEEE.

关键词： K-means clustering

来源：评论

学校读者我要写书评

暂无评论

Aero-optic imaging deviation prediction based on ISSA-ELM

引用

Optoelectronics Letters 2023年第7期19卷 425-431页

作者： XU Liang ZHAO Shiwei WANG Tao Tianjin Key Laboratory for Control Theory&Applications in Complicated Systems School of Electrical Engineering and AutomationTianjin University of TechnologyTianjin 300384China School of Intelligent Engineering Sun Yat-sen UniversityGuangzhou 510275China

When the aircraft is moving at high speed in the atmosphere,aero-optical imaging deviation will appear due to the influence of aero-optical *** order to achieve real-time compensation during the flight of the aircraft,it is necessary to analyze and predict the obtained imaging deviation *** order to improve the search speed and accuracy of the prediction algorithm and the ability to jump out of local optimum,in this paper,an improved sparrow search algorithm optimized extreme learning machine(ISSA-ELM) neural network model is proposed to predict the aero-optical imagine ***,the performance of ISSA-ELM,ELM neural network and SSA-ELM neural network was *** results showed that compared with ELM and SSA-ELM algorithms,the convergence speed of ISSA-ELM was significantly enhanced,and the accuracy of data prediction was also significantly improved.

关键词： effect. deviation extreme

来源：评论

学校读者我要写书评

暂无评论

A Novel Three-DOF Transverse Flux Spherical Actuator With Decoupling Mechanism 26

A Novel Three-DOF Transverse Flux Spherical Actuator With De...

引用

26th International Conference on electrical Machines and Systems, ICEMS 2023

作者： Liu, Xiaoshuai Yan, Liang Xiang, Pengjie He, Xinghua Du, Nannan Wu, Chong Beihang University School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beijing China

ISBN: (纸本)9798350317589

This paper proposes a novel multi-DOF spherical actuator based on transverse flux and three-DOF decoupling mechanism. Firstly, the structure and working principle of the new multi-DOF spherical actuator are presented. Then, numerical simulations are performed to analyze its magnetic field and torque, resulting in the basic performance curve of the spherical motor. Finally, The structure of this spherical actuator is optimized by numerical simulation. The optimization results show that the performance of the optimized spherical actuator has been effectively improved in terms of torque ripple, output torque and control precision. © 2023 IEEE.

关键词： Spheres

来源：评论

学校读者我要写书评

暂无评论

control and Stability of Large-scale Power System with Highly Distributed Renewable Energy Generation:Viewpoints from Six Aspects

引用

CSEE Journal of Power and Energy Systems 2023年第1期9卷 8-14页

作者： Qing-Hua Wu Anjan Bose Chanan Singh Joe H.Chow Gang Mu Yuanzhang Sun Zhaoxi Liu Zhigang Li Yang Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China School of Electrical Engineering&Computer Science Washington State UniversityPullmanWA 99164USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Electrical Computer and Systems EngineeringRensselaer Polytechnic Institute(RPI)TroyNYUSA Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China

Power systems are moving toward a low-carbon or carbon-neutral future where high penetration of renewables is *** conventional fossil-fueled synchronous generators in the transmission network being replaced by renewable energy generation which is highly distributed across the entire grid,new challenges are emerging to the control and stability of large-scale power *** analysis and control methods are needed for power systems to cope with the ongoing *** the CSEE JPES forum,six leading experts were invited to deliver keynote speeches,and the participating researchers and professionals had extensive exchanges and discussions on the control and stability of power ***,potential changes and challenges of power systems with high penetration of renewable energy generation were introduced and explained,and advanced control methods were proposed and analyzed for the transient stability enhancement of power grids.

关键词： Distributed energy resources high converter penetration power system control renewable energy generation stability control transient stability

来源：评论

学校读者我要写书评

暂无评论

A Spoke-Type PM Machine with Quasi-Trapezoid Magnets and Quasi-Dovetail Iron Poles 26

A Spoke-Type PM Machine with Quasi-Trapezoid Magnets and Qua...

引用

26th International Conference on electrical Machines and Systems, ICEMS 2023

作者： Xiang, Pengjie Liang, Yan He, Xinghua Liu, Xiaoshuai Du, Nannan Yang, Xuxu Beihang University School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beijing China

ISBN: (纸本)9798350317589

This paper proposes a spoke-type PM machine with quasi-trapezoid magnets and quasi-dovetail iron poles (SPM-QMQI). The SPM-QMQI can offer several merits. First, the employment of quasi-trapezoid magnet and iron pole help to achieve strong flux-focusing effect and high saliency ratio, respectively, which contributes to enhancing torque output of the SPM-QMQI machine. Second, the quasi-dovetail iron can enhance flux-shielding effect and thus the rotor yoke can be replayed with low-density non-ferromagnetic material contributing to reducing rotor mass. Besides, the dovetail-shaped iron pole can protect the rotor magnet against centrifugal force, and thus the conventional rotor sleeve can be removed contributing to a small airgap length. Third, the magnet usage efficiency of electrical machine can be increased greatly, because of the magnet volume reduction and torque improvement. First, the schematic structure and characteristics of proposed QMQI pole pattern are presented. Subsequently, the impact of the key structural parameters and current angle of the QMQI pole pattern on the output characteristics of the electrical machine is investigated. Following that, the electromagnetic characteristics of the proposed QMQI pole design, such as airgap magnetic field, back electromotive force, torque output and ripple, magnet loss, rotor mass and magnet utilization ratio, are compared with with those of the conventional electric machine design to confirm the merits of the proposed SPM-QMQI design. The SPM-QMQI machine have high torque output, low rotor mass and small magnet volume simultaneously, which is desirable for many industrial applications. © 2023 IEEE.

关键词： Iron

来源：评论

学校读者我要写书评

暂无评论

Dynamic and Static Simulation Analysis and Optimisation Design of DC220V Permanent Magnetic Detacher 7

Dynamic and Static Simulation Analysis and Optimisation Desi...

引用

7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： Dai, Dongyun Zhuo, Kaicai You, Yimin Wang, Xiankun Wang, Xu School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China

ISBN: (纸本)9798350388947

In order to solve the problems of too long action time and low action reliability of electromagnetic type tripping release of vacuum circuit breaker. This paper researches and designs a kind of rated control voltage is DC220V, tripping action time is less than 15ms, tripping current is less than 2A permanent magnetic detacher. Firstly, Solidworks software is applied to establish the 3D model of the permanent magnet detacher and simplify the model. Considering the key components of the permanent magnet detacher, Maxwell simulation software is applied to analyze the dynamic and static simulation of the permanent magnet detacher, which finally meets the design requirements and is verified by tests. The test results show that the designed permanent magnetic detacher can shorten the breaking time of vacuum circuit breaker from the original 30ms to less than 15ms under its rated control voltage. The research results of this thesis can provide guidance for the simulation and optimization design of permanent magnet detacher, which has certain engineering application value. © 2024 IEEE.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

EMI suppression in a Buck converter based on Chaotic Gaussian switching waveform technique

EMI suppression in a Buck converter based on Chaotic Gaussia...

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Wang, Jingsong Li, Chentao Wang, Xutian Xu, Ping Ma, Qishaung School of Automation Science and Electrical Engineering Beihang University Beijing China Navigation Guidance and Control Institute of NORINCO Group Beijing100089 China

With the extensive use of wide bandgap represented by silicon carbide (SiC) and gallium nitride (GaN) semiconductor devices, The power density of power electronic converters has been enhanced, driving towards miniaturization and integration, which has led to a more intricate electromagnetic environment within power converters, and the accompanying electromagnetic interference (EMI) problem has become more prominent. Generally, the voltage and current mutation caused by the rapid switching action of power semiconductor devices is regarded as the primary source of EMI in power converters. To mitigate the conducted EMI from power converters, this study employed an infinitely differentiable "S"-shaped Gaussian function and chaotic pulse width modulation (CPWM) signals for convolution, yielding an optimized chaotic gaussian pulse width modulation (CGPWM) signal that served as a reference waveform to shape the switching voltage waveform of the power metal-oxide-semiconductor field-effect transistors (MOSFETs). Experimental results demonstrate the efficacy of this driving waveform in suppressing EMI generated by power converters. © The Institution of engineering & Technology 2024.

关键词： Gallium nitride

来源：评论

学校读者我要写书评

暂无评论

Sensorless control of submersible permanent magnet synchronous motor under long-line cable model 4

Sensorless control of submersible permanent magnet synchrono...

引用

2023 4th International Conference on electrical Technology and Automatic control, ICETAC 2023

作者： Yue, Youjun Zheng, Lihua College of Electrical Engineering and Automation Tianjin Key Laboratory of Control Theory and Application for Complex Systems Tianjin University of Technology Tianjin300384 China

In the process of oil production, the submerged oil motor works 1-3 km downhole and is connected to the inverter by a long-wire cable, which generates overvoltage at the motor end due to the problem of matching the impedance of the motor with the impedance of the power cable. The downhole environment is not suitable for the installation of precision devices, such as position sensors. To solve these problems, a sensorless control method of submerged oil motors based on a high-frequency voltage injection method is proposed. A motor terminal voltage and current observer under a long-wire cable model is designed to estimate the actual values of motor terminal voltage and current by collecting the voltage and current at the inverter terminal. A three-level inverter is used to provide energy to the submersible oil electric pump through the long-wire cable, which can effectively suppress the motor terminal overvoltage compared to the two-level inverter. The control algorithm is verified by modeling the whole system using simulation software. © Published under licence by IOP Publishing Ltd.

关键词： Cables

来源：评论

学校读者我要写书评

暂无评论

RELIABILITY PREDICTION OF POWER ELECTRONIC CONVERTERS BASED ON SURROGATE MODELS 14

RELIABILITY PREDICTION OF POWER ELECTRONIC CONVERTERS BASED ...

引用

14th International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2024

作者： Gao, Junpeng Zhao, Zichuan Chen, Cen Ye, Xuerong Zhai, Guofu School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China AVIC Xi'an Flight Automatic Control Research Institute Xi'an China

ISBN: (纸本)9781837242672

Power electronic converters (PEC) are integral to various sectors, including power systems, transportation, and industrial production, where their reliability significantly influences overall system performance. Despite its importance, current research has not thoroughly addressed the simultaneous impact of component performance degradation and functional failures on electronic system performance. This paper introduces a reliability prediction method for PEC that considers both component performance degradation and functional failure. Initially, digital prototype models of PEC are developed to accurately represent the operational processes and simulate performance under each critical fault mode. To minimize simulation costs, two surrogate models based on neural networks are then established for PEC. Subsequently, through iterative calculations that utilize models of performance degradation and functional failures of components, an analysis of both PEC performance degradation and functional failure states is conducted, facilitating the completion of PEC reliability prediction. This proposed framework for reliability prediction may also be applicable to other electronic systems. © The Institution of engineering & Technology 2024.

关键词： Prediction models

来源：评论

学校读者我要写书评

暂无评论

Simulation and Optimization of Electrostatic Field in 40.5kV Inflatable Switchgear Cabinet 7

Simulation and Optimization of Electrostatic Field in 40.5kV...

引用

7th International Conference on Electric Power Equipment - Switching Technology, ICEPE-ST 2024

作者： You, Yimin Wang, Xiankun Dai, Dongyun Zhuo, Kaicai Wang, Xu School of Electrical Engineering and Automation Xiamen University of Technology Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control Xiamen China

ISBN: (纸本)9798350388947

The current rapid development of China's power transmission and transformation industry, inflatable switchgear has excellent environmental adaptability and small size, in the transmission and distribution network has been widely used. In order to further enhance the application range of inflatable cabinets, it is important to optimize the insulation performance of miniaturized switchgear. In this paper, electrostatic field simulation of 40.5kV inflatable switchgear based on the finite element method is carried out to judge the internal electric field distribution. Simulate and analyze the potential distribution and electric field strength distribution under the operating condition of the circuit breaker of the inflatable switchgear. The simulation results show that the electric field of sulfur hexafluoride in the outer shell of the inflatable switchgear is more concentrated near the poles, and the maximum value of the electric field reaches 78.2kV/mm, which exceeds the breakdown strength of the sulfur hexafluoride medium by 9kV/mm. Subsequently, the problem of excessive localized field strength is solved by studying the effects of conditions such as the length of the metal shielding ring and the radius of the metal crimp on the shielding effect. According to the simulation data, maintaining the volume and basic layout of the existing inflatable switchgear cabinet unchanged, after adding the optimized grounded metal shielding ring, the field strength at the pole and shell can be reduced to less than 9kV/mm, which meets the insulation requirements. The research results of this paper can provide theoretical guidance for the optimal design of the insulation of inflatable switchgear. © 2024 IEEE.

关键词： Sulfur hexafluoride

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：