检索结果-内蒙古大学图书馆

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Lou, Hangchuan Song, Shuang Cheng, Si Liu, Hengyang Wu, Xianglong Kong, Wubin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei China Wuhan Maritime Communication Research Institute Hubei China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

A high-precision digital phase discriminator based on adaptive sampling is proposed for an antenna automatic tuning system. FFT is used to detect the phase. The output signal of the tuning system is a periodic signal with a non-constant frequency. To reduce spectrum leakage, adaptive sampling is employed to realize phase detection of sinusoidal periodic signals in a certain frequency range. In addition, the antenna automatic tuning system outputs non-sinusoidal periodic low-power signals during tuning. By adding a frequency comparison in the adaptive sampling process, the phase detection of non-sinusoidal periodic signal in a certain frequency range is realized. The combination of odd-even frequency division and half-integer frequency division is adopted to reduce the phenomenon of spectrum leakage. A phase discrimination experiment platform is constructed to verify the effectiveness of the proposed phase discriminator. The accordance between the analysis and experimental results further testify to the advantages. © 2022 IEEE.

关键词： Antennas

来源：评论

学校读者我要写书评

暂无评论

Structure-free containment control for uncertain underactuated multiple Euler-Lagrange systems

引用

Science China(Information Sciences) 2023年第11期66卷 150-168页

作者： Housheng SU Yali WU Liren ZHANG Xia CHEN Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China School of Artificial Intelligence and Automation Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

This article studies the problem of structure-free distributed containment control for uncertain underactuated multiple Euler-Lagrange systems(MELSs) considering disturbances by using a layered approach. First, the second layer is the virtual layer constructed artificially for hierarchical control. We move all virtual nodes to the convex hull formed by leaders in the first layer by implementing containment control algorithms on all virtual nodes. Then, the third layer is the following layer, and we propose an adaptive robust tracking controller to ensure that each follower in the third layer tracks the corresponding virtual node in the second layer. So far, the underactuated MELSs can achieve containment control. Furthermore,through the theoretical derivation, sufficient conditions are obtained to achieve the objective of structure-free containment control. Finally, the effectiveness of the proposed stratified structure-free containment control method is verified by a simulation example.

关键词： Euler-Lagrange systems underactuated system containment control adaptive-robust control

来源：评论

学校读者我要写书评

暂无评论

Magnetic diagnostics for magnetohydrodynamic instability research and the detection of locked modes in J-TEXT

引用

Plasma Science and technology 2021年第5期23卷 49-58页

作者： Dongliang HAN Chengshuo SHEN Nengchao WANG Da LI Feiyue MAO Zhengkang REN Yonghua DING the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

Magnetohydrodynamic(MHD)instabilities are widely observed during tokamak plasma *** diagnostics provide important information which supports the understanding and control of MHD *** paper presents the current status of the magnetic diagnostics dedicated to measuring MHD instabilities at the J-TEXT tokamak;the diagnostics consist of five Mirnov probe arrays for measuring high-frequency magnetic perturbations and two saddle-loop arrays for low-frequency magnetic perturbations,such as the locked *** recent years,several changes have been made to these *** structure of the probes in the poloidal Mirnov arrays has been optimized to improve their mechanical strength,and the number of in-vessel saddle loops has also been improved to support better spatial *** to the installation of high-field-side(HFS)divertor targets in early 2019,some of the probes were removed,but an HFS Mirnov array was designed and installed behind the *** to its excellent toroidal symmetry,the HFS Mirnov array has,for the first time at J-TEXT,provided valuable new information about the locked mode and the quasi-static mode(QSM)in the ***,various groups of magnetic diagnostics at different poloidal locations have been systematically used to measure the QSM,which confirmed the poloidal mode number m and the helical structure of the *** including the HFS information,the 2/1 resonant magnetic perturbation(RMP)-induced locked mode was measured to have a poloidal mode number m of~2.

关键词： J-TEXT tokamak locked mode magnetic diagnostics magnetohydrodynamic instabilities

来源：评论

学校读者我要写书评

暂无评论

Research on Voltage Stabilizing System of Switched Reluctance Motor Based on Fuzzy PID Control

Research on Voltage Stabilizing System of Switched Reluctanc...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Tong Chang Shuanghong Wang Zixin Li The State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

This paper proposes a control strategy based on fuzzy PID control of Switched Reluctance Motor Generator (SRMG) in response to the voltage fluctuation issues caused by load variations in switched reluctance motor system. This strategy is constructed based on the fundamental principles of closed-loop control and fuzzy control theory, incorporating a parameter-adaptive fuzzy PID controller and system model. Initially, a switched reluctance motor system was constructed to obtain voltage fluctuation data. Subsequently, aiming for voltage stabilization, a control algorithm for SRMG under constant speed mode was designed using the fuzzy PID controller, adopting a dual closed-loop control strategy for speed and current. Finally, compared with conventional PID control, the fuzzy PID controller was shown to effectively improve response speed, reduce voltage overshoot, and decrease voltage fluctuation time, demonstrating superior voltage stabilization performance.

关键词： Fuzzy control PI control Voltage fluctuations Fluctuations Uncertainty Switched reluctance motors Generators Mathematical models PD control Voltage control

来源：评论

学校读者我要写书评

暂无评论

Research and Test of the Error Self-monitoring Merging Unit 16th

Research and Test of the Error Self-monitoring Merging Unit

引用

16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Wang, Chengnan Hu, Haoliang Li, Dong Huang, Junchang Li, Xiaofei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Electric Power Research Institute Wuhan China

ISBN: (纸本)9789811915314

In the digital electric energy metering system, the Merging Unit is responsible for converting analog signals into digital messages, and its analog-to-digital conversion precision directly affects the accuracy of the entire digital electric energy measurement. At present, the accuracy of the Merging Unit is usually checked by the means of regular power outage maintenance. This method has a large workload, a long verification time, and a high verification cost. Therefore, an error self-monitoring Merging Unit scheme based on ADI’s mSure technology is proposed. With the error self-monitoring chip as the core, the corresponding hardware architecture is designed to realize the online error monitoring of the Merging Unit. A sampling processing module is developed based on FPGA to realize the digital message sending function. The Merging Unit calibrator is used to test the measurement accuracy. The experimental results show that this Merging Unit meets the accuracy requirement of class 0.2. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Errors

来源：评论

学校读者我要写书评

暂无评论

Research on the Scheme and Experiment of Quantum-Voltage-Based Verification Device for the Transformer Calibrator 16th

Research on the Scheme and Experiment of Quantum-Voltage-Bas...

引用

16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Wu, Ruoyu Hu, Haoliang Li, Dong Nie, Qi Huang, Junchang Li, Xiaofei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China China Electric Power Research Institute Wuhan China

ISBN: (纸本)9789811915314

In order to improve the sampling accuracy of the verification device for the transformer calibrator, a novel verification device scheme based on AC quantum voltage is proposed. The AC quantum voltage is used as the reference of the measured sine signal, and their difference signal is sampled by a multimeter with a small range. After that, a FPGA program reconstructs the sine sampling value based on the difference signal and the known AC quantum voltage to acquire high accuracy sine signal sampling. Limited by experimental conditions, the precision AC voltage reference standard 7410 is used to simulate the AC quantum voltage source output, and the simulation experiment is performed. The experimental results show that the accuracy of the verification device can reach 0.05%. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Signal sampling

来源：评论

学校读者我要写书评

暂无评论

Research on Voltage Coordinated Control Strategy of Multi-port Energy Router 5

Research on Voltage Coordinated Control Strategy of Multi-po...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Zheng, Pingkang Cai, Tao Zhao, Caihong Duan, Qing Huazhong University of Science and Technology The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China China Electric Power Research Institute Beijing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

This paper takes the energy router with DC bus as the research object. Due to the needs of DC bus voltage stability regulation in the energy router, a voltage hierarchical coordinated control method using the droop control principle is proposed. The DC bus voltage of the system is divided into three layers. In different voltage control layers, grid connected unit, energy storage unit and photovoltaic unit are used as voltage sources to control bus voltage stability and power balance. This control method only needs each converter to control its own working state according to the local voltage signal, and does not need the communication line between the central controller and each converter, which can simplify the system structure. A simulation model is built in Matlab / Simulink to verify the proposed voltage hierarchical coordinated control strategy. The simulation results show that the control strategy can realize the stable operation of the energy router, and the operation modes of each converter can switch smoothly, which verifies the effectiveness of the control strategy. © 2022 IEEE.

关键词： Voltage control

来源：评论

学校读者我要写书评

暂无评论

A Fast Analytical Dose Calculation Approach Based on RAMDIM in MR-Guided Proton Therapy

A Fast Analytical Dose Calculation Approach Based on RAMDIM ...

引用

Electronic Information engineering and Computer technology (EIECT), International Conference on

作者： Songbin Chen Ping Tan Haimin Xiong Zhihong Qian Dan Tang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331528850

ISBN: (纸本)9798331528867

In magnetic resonance-guided proton therapy, protons are deflected in magnetic fields, resulting in distortion of the dose distribution. In dose calculation, Monte Carlo simulation methods are highly accurate but time-consuming. Clinical dose validation requires a fast and accurate method to calculate the dose distribution. In this paper, a fast analytical dose calculation approach is proposed based on Raytracing Algorithm for Magnetic Deflection of Ions in Media. Different energies, different magnetic field strengths and different energy spreads are considered, and the $\gamma$ -pass rates in all cases exceeds 98%.

关键词： Protons Particle beams Accuracy Monte Carlo methods Magnetic resonance imaging Resonance Proton therapy Workstations Trajectory Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation of V-q Characteristics of Impulsive Corona for Thin Conductor in Coaxial Corona Cage

Numerical Simulation of V-q Characteristics of Impulsive Cor...

引用

2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Kang, Zhuofan He, Huiwen Wang, Lei Zhang, Shimin Huang, Yubin He, Hengxin Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology China China Electric Power Research Institute Wuhan430074 China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

In order to calculate the lightning overvoltage waveform and propagation process considering the impulse corona effect, based on Finite Difference Time Domain (FDTD) and streamer discharge theory, a method is proposed to determine the corona area dynamically, and a thin conductor corona calculation model that can consider the effect of inhomogeneous electric field on corona and corona dynamic process is established. The study of V-q characteristics of the coaxial corona cage system was carried out to verify the accuracy of the model. The influence of the corona conductivity on the V-q characteristics was analyzed, and it was concluded that the conductivity of 100mumathrm{S}/mathrm{m} under positive polarity corona is in good agreement with the experimental results in the literature. The effect of the measurement capacitor on the V-q characteristics is also analyzed, and it is concluded that the V-q characteristics measured by a corona cage under a particular condition cannot be extrapolated to a real transmission line. The work in this paper can provide a reference for lightning overvoltage simulation calculations considering the impulse corona effect and V-q characteristic measurement tests using corona cages. © 2022 IEEE.

关键词： Finite difference time domain method

来源：评论

学校读者我要写书评

暂无评论

A Double Gaussian Denoising Method for Beam Profiling in Proton Therapy

A Double Gaussian Denoising Method for Beam Profiling in Pro...

引用

Electronic Information engineering and Computer technology (EIECT), International Conference on

作者： Haimin Xiong Ping Tan Songbin Chen Zhihong Qian Dan Tang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798331528850

ISBN: (纸本)9798331528867

The beam position and size are critical for the safety of the proton therapy system. In view of the distortion of data collected by the ionization chamber during radiating, the possible physical process of noise generation is analyzed and a denoising method based on double Gaussian fitting is proposed for beam profiling in this paper. To investigate the effect of air scattering on the distortion of measured data, we performed the simulation analysis of the process after the proton beam enters the ionization chamber using Garfield++. It was found that the double Gaussian denoising method has obvious advantages over the simple single Gaussian fitting.

关键词： Particle beams Fitting Noise reduction Noise Scattering Distortion Proton therapy Distortion measurement Ionization chambers Standards

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：