检索结果-内蒙古大学图书馆

2008 IEEE Instrumentation and measurement Technology Conference (I2MTC 2008), vol.1

作者： Dong Liu Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Electromagnetic tomography (EMT) is a kind of electric tomography in combining with electromagnetic induction principles and computerized tomography. It is widely studied and applied in biomedical and industrial area recently. EMT sensor has advantages of non-invasion, non-contact and non-hazard. The paper aims to work on design of EMT sensor on double-frequency excitation EMT sensor adopts eight coils distributed homogenously out of measuring pipe. The sensing field model is set up based on electromagnetic induction principle and the simulation is practiced in COMSOL Multiphysics. The relation between position information, conductivity and permeability of object and measurement electric potential are presented and analyzed in the paper. The diameters of screen and coils are simulated in the paper. Simulative Result of EMT sensor describes the relation map of between sensing field and measurement voltage and provides useful prior information for design of EMT system.

关键词： Electromagnetic Tomography Sensing field Forward Problem double-frequency excitation

来源：评论

学校读者我要写书评

暂无评论

Feedback controller designed for a class of hybrid systems with adaptation to delay parameter

引用

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) 2008年第SUPPL. 2期38卷 90-95页

作者： Chai, Lin Cheng, Ming Fei, Shumin Zhai, Junyong Huang, Jingyan School of Automation Southeast University Nanjing 210096 China Key Laboratory of Measurement and Control of CSE Southeast University Nanjing 210096 China School of Electrical Engineering Southeast University Nanjing 210096 China Wuxi Measurement Testing Center Wuxi 214031 China

The memory state feedback control problems are addressed for a class of complex hybrid time-delay control systems, in which input control is discrete-time, while state is continuous-time and the state delay parameter is not known exactly. By means of the linear matrix inequalities (LMIs) method and a kind of Lyapunov-Krasovskii functional, the controller design is proposed based on models of both continuous-time domain and discrete-time one. Under the action of our designed discrete adaptive control law, the unknown time-delay parameter can be included in memory state feedback controller. Using LMI technique, delay-dependent sufficient conditions are obtained for the existence of the feedback controller.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

The improvement of dual-plane ERT system by parallel data acquisition method 5

The improvement of dual-plane ERT system by parallel data ac...

引用

5th World Congress in Industrial Process Tomography

作者： Tan, C. Dong, F. Wang, B. School of Electrical Engineering and Automation Tianjin University Tianjin China Tianjin Key Laboratory of Process Measurement and Control Tianjin China

ISBN: (纸本)9780853163213

Electrical resistance tomography (ERT) is a kind of Process Tomography (PT) which is based on the theory of electromagnetic fields and the principle of electrical sensitivity. It has an extensive application prospect in industrial processes. However, it is restricted by the precision, speed and computational capability of existing *** to the operating principle of ERT system, the measurement precision and error closely relate to the systems real-time performance and the performance is mainly restricted by the DAS module. In order to improve the operational speed, the scheme of a parallel dual-plane ERT system is brought out. This new system is based on parallel data-acquisition and processing, it measures the boundary voltages of 16 electrodes synchronously. The digital I/O card and high speed A/D transition card are implemented in this system to reduce the switch time of the measuring signal and to improve system performance. In adjacent exciting strategies and alternate electrode plane selection, this system can theoretically acquire at least 300 frames of cross-section per second. © 2007, International Society for Industrial Process Tomography. All rights reserved.

关键词： Electrodes

来源：评论

学校读者我要写书评

暂无评论

Solution to the Generalized Champagne Problem on simultaneous stabilization of linear systems

引用

Science in China(Series F) 2007年第5期50卷 719-731页

作者： GUAN Qiang WANG Long XIA BiCan YANG Lu YU WenSheng ZENG ZhenBing Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Center for Systems and Control College of Engineering Peking University Beijing 100871 China LMAM and School of Mathematical Sciences Peking University Beijing 100871 China Shanghai Institute of Theoretical Computing Software Engineering Institute East China Normal University Shanghai 200062 China National Key Laboratory of Intelligent Technology and Systems Tsinghua University Beijing 100084 China

The well-known Generalized Champagne Problem on simultaneous stabilization of linear systems is solved by using complex analysis and Blonders technique. We give a complete answer to the open problem proposed by Patel et al., which automatically includes the solution to the original Champagne Problem. Based on the recent development in automated inequality-type theorem proving, a new stabilizing controller design method is established. Our numerical examples significantly improve the relevant results in the literature.

关键词： linear systems stabilization simultaneous stabilization Champagne Problem Generalized Champagne Problem,complex analysis inequality-type theorem automated theorem proving

来源：评论

学校读者我要写书评

暂无评论

Simulation on sensing field of electromagnetic tomography technology 5

Simulation on sensing field of electromagnetic tomography te...

引用

5th World Congress in Industrial Process Tomography

作者： Yixuan, X. Shu, Z. Feng, D. School of Electrical Engineering and Automation Tianjin University Tianjin China Institute of Biomedical Engineering Chinese Academy Medical Science Tianjin China Tianjin Key Laboratory of Process Measurement and Control Tianjin China

ISBN: (纸本)9780853163213

Electromagnetic Tomography (EMT) which combined electromagnetic theory and computerized tomography technology is one of the electrical tomography technologies. This technology can reconstruct the spatiotemporal distributions of the electrically conductive and magnetically permeable materials by detecting the boundary magnetic induction of the researching space. The sensor of the EMT system has advantages of non-invasive, non-contacting and non-hazardous. So it has many potential applications in industrial fields, such as processing, foreign body detection in food processing, geologic exploration and multi-phase flow measurement. This paper studies the sensing field of EMT using the finite element (FEM) simulation, and the magnetic induction distribution of the empty field with this excitation model has been acquired. The influence of objects with different permeability, conductivity, and positions on the excitation sensing field was analyzed. © 2007, International Society for Industrial Process Tomography. All rights reserved.

关键词： Electric fields

来源：评论

学校读者我要写书评

暂无评论

AN IMAGE RECONSTRUCTION ALGORITHM BASED ON REGULARIZATION OPTIMIZATION FOR PROCESS TOMOGRAPHY

AN IMAGE RECONSTRUCTION ALGORITHM BASED ON REGULARIZATION OP...

引用

2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： YONG-WEI DING FENG DONG School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072 China

An image reconstruction algorithm based on regularization optimization for Process Tomography is proposed in this *** the comparison of the images reconstructed by Linear Back Projection algorithm, Sensitivity Coefficient algorithm, singular value decomposition algorithm and the regularization optimization algorithm proposed in this paper, it is apparent that images can be reconstructed clearly and quickly by the regularization optimization *** regularization optimization algorithm is a very good image reconstruction algorithm both in image quality and the reconstruction speed.

关键词： Image reconstruction Linear back projection algorithm Sensitivity coefficient algorithm Singular value decomposition algorithm Regularization optimization

来源：评论

学校读者我要写书评

暂无评论

OPTIMIZATION DESIGN OF ELECTRICAL RESISTANCE TOMOGRAPHY DATA ACQUISITION SYSTEM

OPTIMIZATION DESIGN OF ELECTRICAL RESISTANCE TOMOGRAPHY DATA...

引用

2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： FENG DONG ER-PING LI BIN-BIN WANG School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072 China

The process tomography based on electrical sensitive principles is a new technology which aims at section information measurement Electrical Resistance Tomography is one kind of process tomography which is based on electrical sensitive *** has advantages of being non-intrusive, non-radiate, online visual monitoring and low in cost There are some disadvantages in data acquisition speed, stability and reliability in the existing ERT *** at these problems, a new ERT data acquisition system based on digital I/O card and A/D conversion card is developed;every other module of the ERT system make an improvement: the system backboard uses an user-defined bus;the sine-wave generator module use a DDS chip to generate signals whose phase, amplitude and frequency can change easily;a multiplication demodulation which can be controlled easily has been used to improve the transition speed. By calculation, the data acquisition speed of the system has been *** structure is simple, so the stability and reliability is better than before.

关键词： Electrical Resistance Tomography Data acquisition system Optimum design

来源：评论

学校读者我要写书评

暂无评论

DESIGN OF HIGH SPEED CROSS SECTION measurement SYSTEM AND ITS REAL-TIME PERFORMANCE ANALYSIS

DESIGN OF HIGH SPEED CROSS SECTION MEASUREMENT SYSTEM AND IT...

引用

2007 International Conference on Machine Learning and Cybernetics(IEEE第六届机器学习与控制论国际会议)

作者： CHAO TAN FENG DONG BIN-BIN WANG School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072 China

This paper presents the development of a new cross section measurement system for on-line measurement of two-phase *** improve the real-time performance of the cross section measurement system, the parallel data acquisition system is designed, which has 16 channels of amplifiers, 16 channels of demodulators and filters, and AD card with 16 channels, can get the boundary voltage from 16 electrodes *** with the parallel data acquisition system, the former systems need to get the boundary voltage one by one, by this system the real-time performance is improved obviously, this system costs only 1/13 of the former system processing time. Several units of the system are analyzed, the principle of the multiplication demodulation was analyzed, especially, the low pass filter was analyzed, which costs most time of the data acquisition *** system performance is analyzed, a data acquisition speed at approximately 1000 dual-frames per second can be achieved.

关键词： Cross section measurement system Parallel data acquisition system Real-time performance Multiplication demodulation Low pass filters

来源：评论

学校读者我要写书评

暂无评论

Guest Editorial: Networking, Sensing, and control for Networked control systems: Architectures, Algorithms, and Applications

引用

IEEE Transactions on systems, Man, and Cybernetics, Part C (Applications and Reviews) 2007年第2期37卷 157-159页

作者： Fei-yue Wang Derong Liu Simon X. Yang Li Li Key Laboratory of Complex Systems Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China Department of Systems and Industrial Engineering University of Arizona Tucson Tucson AZ USA Institute of Electrical Engineering Yanshan University슠 Qinhuangdao China Department of Electrical and Computer Engineering University of Illinois Chicago IL USA School of Engineering University of Guelph Guelph ONT Canada Department of Automation Tsinghua University Beijing China

The eight papers in this special issue focus on networking, sensing, and control for networked control systems (NCS). The papers, which are briefly summarized, examine the architectures, algorithms and applications of... 详细信息

关键词： control systems Networked control systems Communication system control Automatic control Communication system operations and management Computer network management Stability Resource management Computer architecture Computer networks

来源：评论

学校读者我要写书评

暂无评论

Balance Properties and Stabilization of Min-Max systems

引用

International Journal of automation and computing 2006年第1期3卷 76-83页

作者： Yue-Gang Tao Wen-De Chen Yi-Xin Yin Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 PRC Laboratory of Systems and Control Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 PRC School of Information Engineering University of Science and Technology Beijing Beijing 100083 PRC

A variety of problems in operations research, performance analysis, manufacturing, and communication networks, etc., can be modelled as discrete event systems with minimum and maximum constraints. When such systems require only maximum constraints （or dually, only minimum constraints）, they can be studied using linear methods based on max-plus algebra. systems with mixed constraints are called min-max systems in which rain, max and addition operations appear simultaneously. A significant amount of work on such systems can be seen in literature. In this paper we provide some new results with regard to the balance problem of min-max functions; these are the structure properties of min-max systems. We use these results in the structural stabilization. Our main results are two sufficient conditions for the balance and one sufficient condition for the structural stabilization. The block technique is used to analyse the structure of the systems. The proposed methods, based on directed graph and max-plus algebra are constructive in nature. We provide several examples to demonstrate how the methods work in practice.

关键词： Balance fixed point min-max systems output feedback structural stabilization.

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：