检索结果-内蒙古大学图书馆

作者： Schreiber, Alexander Isermann, Rolf Laboratory of Control Engineering and Process Automation Institute of Automatic Control Darmstadt University of Technology Landgraf-Georg-Str. 4 D-64283 Darmstadt Germany

ISBN: (纸本)9783902661265

The optimized control of combustion engines with regard to minimized fuel consumption and emissions requires nonlinear models. Because of an increase of control inputs, like fuel mass flow, injection angle, exhaust gas recirculation flow and several outputs like torque, nitrogen oxides (NOx), hydrocarbons (HC) and particulates the classical grid-based measurement techniques take too long time and do not include dynamics. Therefore different measurement strategies for the stationary and dynamic behavior are described, like Design of Experiments (DoE) and use of suitable neural networks and Pseudo-Random-Binary-Signals (PRBS). As the structure of the models is not precisely known a-priori, nonlinear identification methods in form of special versions of neural networks are good candidates. Therefore, it will be shown how with special amplitude-modulated pseudo random binary signals (APRBS), simultaneous excitation of several input signals, nonlinear multi-input multi-output models can be obtained in relatively short time. Copyright © 2006 IFAC.

关键词： Nitrogen oxides

来源：评论

学校读者我要写书评

暂无评论

Experimental study on degradation of 1Cr5Mo steel tubes in the coking furnace at super temperature

Experimental study on degradation of 1Cr5Mo steel tubes in t...

引用

作者： Deming, Fang Ying, Li Baiyang, Lou Zhejiang University of Technology Institute of Process Equipment and Control Engineering MOE Key Laboratory of Mechanical Manufacture and Automation Hangzhou 310032 China

Microstructure, hardness and mechanical properties of the ICr5Mo steel tubes for the coking furnace at super temperature were investigated in this paper. It revealed that under super-temperature, oxidation corrosion for the furnace tubes was strengthened, wall thickness was evident thinner, pearlite in microstructure was spheroidised mostly, strength would be decreased and marked degradation in material occurred.

关键词： Coke fueled furnaces

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

Assessment of fire damage to 321 stainless steel equipment in a chemical unit

Assessment of fire damage to 321 stainless steel equipment i...

引用

作者： Zhang, Wei Gao, Zengliang Zhang, Kangda Fang, Zheng Lu, Xiaoyan Bao, Weiguang Zhu, Guorong Zhejiang University of Technology Institute of Process Equipment and Control Engineering MOE Key Laboratory of Mechanical Manufacture and Automation Hangzhou China Ningbo Special Equipment Inspection and Testing Centre Ningbo China

In the present work, the mechanical properties of 321 stainless steel pressure equipments exposed to an accident fire in a chemical unit were investigated. The performance and microstructure of this material were described by chemical compositions analysis, tensile test, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The experiment results showed that the mechanical properties of the material were degraded. The grains on the external surface of the fracture became coarse. These results indicated that serious damage to 321 stainless steel had been induced by extreme heat of the fire and this pressure vessel could not be used anymore.

关键词： Stainless steel

来源：评论

学校读者我要写书评

暂无评论

A memetic co-evolutionary differential evolution algorithm for constrained optimization

A memetic co-evolutionary differential evolution algorithm f...

引用

Congress on Evolutionary Computation

作者： Bo Liu Harman Ma Xuejun Zhang Yan Zhou Intitute of Process Control Department of Automation Tsinghua University Beijing China Department of Electrinic Engineering Tsinghua University Beijing China School of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics Beijing China Institute of Process Control Department of Automation Tsinghua University Beijing 100084 China

In this paper, a memetic co-evolutionary differential evolution algorithm (MCODE) for constrained optimization is proposed. Two cooperative populations are constructed and evolved by independent differential evolution (DE) algorithm. The purpose of the first population is to minimize the objective function regardless of constraints, and that of the second population is to minimize the violation of constraints regardless of the objective function. Interaction and migration happens between the two populations when separate evolutions go on for several iterations, by migrating feasible solutions into the first group, and infeasible ones into the second group. Then, a Gaussian mutation is applied to the individuals when the best solution keep unchanged for several generations. The algorithm is tested by five famous benchmark problems, and is compared with methods based on penalty functions, co-evolutionary genetic algorithm (COGA), and co-evolutionary differential evolution algorithm (CODE). The results proved the proposed cooperative MCODE is very effective and efficient.

关键词： Constraint optimization Evolutionary computation

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

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

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

IDENTIFICATION METHODS FOR EXPERIMENTAL NONLINEAR MODELING OF COMBUSTION ENGINES

引用

IFAC Proceedings Volumes 2007年第10期40卷 351-357页

作者： Alexander Schreiber Rolf Isermann Darmstadt University of Technology Institute of Automatic Control Laboratory of Control Engineering and Process Automation Landgraf-Georg-Str. 4 D-64283 Darmstadt Germany Phone: +49 6151 16 2114 Fax: +49 6151 16 6114

关键词： Engine modeling nonlinear models neural networks dynamic modeling test generation

来源：评论

学校读者我要写书评

暂无评论

Room for improvement

引用

ABB Review 2007年第1期 56-61页

作者： Kroll, Andreas Simon, Frank Cheever, Gordon Pilbacka, Tomi Stanier, David Measurement and Control University of Kassel Germany ABB Corporate Research Germany ABB Automation GmbH Mannheim Germany ABB Process Automation Service Business Development Wickliffe United States ABB Full Service Helsinki Finland ABB Engineering Service Billingham United Kingdom

The method and computer-aided tool described in this article can be used for the rapid assessment and bench-marking of automation systems, their performance and related working procedures. Potential for improvement can be identified and its economic impact estimated. This new method has helped customers to identify the most relevant issues in several pilot studies.

关键词： Computer aided engineering

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：