检索结果-内蒙古大学图书馆

作者： Liu, Zhe Gu, Yong Xie, Lei State Key Lab. of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 China

Model Predictive control technology as the most typical method of Advanced Process control has been developed rapidly and applied widely in process industry. Weather MPC controllers operate well or not affect the enterprise benefit directly, therefore it is significant to carry out economic performance assessment and optimization. As a pragmatic method, LQG benchmark introduces manipulated variables together with controlled variables into quadratic dynamic index, which is more suitable for industrial application than Minimum Variance control benchmark. However, traditional LQG benchmark is regressed from an unbalanced distribution of discrete points set, which causes unnecessary calculation and poor regression in more important parts of points set. To avoid this, the relationship between manipulated variables variance and controlled variables variance was calculated, an equal-grid LQG benchmark was introduced and added in two layers MPC optimization problem as an equation constraint, then the optimal MPC setting values or reference trajectory could be obtained. The economic performance assessment and simulation results for delayed coking furnace show the effect of proposed methods. © 2011 Zhejiang University.

关键词： Model predictive control

来源：评论

学校读者我要写书评

暂无评论

Universal Delayed Kalman Filter with Measurement Weighted Summation for the Linear Time Invariant System

引用

电子学报(英文版) 2011年第1期20卷 67-72页

作者： GE Quanbo XU Tingliang FENG Xiaoliang WEN Chenglin State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China Institute of Information and Control Hangzhou Dianzi University Hangzhou China College of Computer and Information Hohai University Nanjing China

This paper considers the design of univer- sal delayed Kalman filter for the networked tracking sys- tem with arbitrary random delay. Firstly, an equivalent Weighted summation form of the conventional Kalman fil- ter (WSFKF) is given to provide a novel frame to more effectively solve the delayed filtering or Out-of-sequence measurements (OOSMs) estimate. In nature, this form makes perfectly use of the properties of offline parameters computation for Kalman filter and weighted summation of initial state estimate and the ordered measurements, which are respectively from Linear time invariant (LTI) system and Linear minimum mean square error (LMMSE) estima- tor. Secondly, by combing a replacement with global mea- surement prediction and a compensation operation based on the innovation of delayed measurement and adaptive on- line weighted coefficient matrix, a novel universal delayed Kalman filter which is applicable to the arbitrary random delay is designed under the WSFKF frame. Compared with the current delayed filters or OOSMs update meth- ods, the proposed delayed estimator has not only more con- cise algorithm structure and better estimate accuracy but also stronger application range. The example is demon- strated to validate the proposed delayed estimator in this paper.

关键词：线性时不变系统卡尔曼滤波延迟测量加权求和通用线性最小均方误差状态估计滤波器设计

来源：评论

学校读者我要写书评

暂无评论

Monte-Carlo Approach of Ground Distribution for Structural Fragments

引用

Procedia Engineering 2012年 37卷 348-353页

作者： Dongliang Sun Guangtuan Huang Juncheng Jiang Mingguang Zhang Zhirong Wang State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology No. 130 Meilong Road Xuhui District Shanghai 200237 China Jiangsu Key Laboratory of Urban and Industrial Safety Institute of Safety Engineering School of Urban Construction and Safety Engineering Nanjing University of Technology No. 200 Zhongshan North Road Nanjing 210009 China

The effects on the ground distributions of fragments respectively from the explosion of cylindrical and spherical vessels were investigated using Monte-Carlo simulations, to explore the characteristics of the fragment trajectory term. The results showed that wind shear and turbulence sent the fragments impacting in shorter distances than with no wind, and the ground distributions of fragments with wind shear were almost the same as those with turbulence; the probabilistic confidence intervals became narrower with increasing number of simulations, and the accuracy of the results increased due to the larger number of samples corresponding to the larger number of simulations.

关键词： Fragment trajectory Ground distribution industrial explosion Monte-Carlo simulations Vessels

来源：评论

学校读者我要写书评

暂无评论

Improved stability criteria for uncertain neutral systems with interval time-varying delays

引用

Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and technology 2012年第SUPPL.2期36卷 76-81页

作者： Wu, Han Gao, Jin-Feng Su, Hong-Ye Institute of Automation Zhejiang Sci-Tech University Hangzhou 310018 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China

The robust stability for neutral systems with time-varying delay and uncertainties is investigated in this paper. Two kinds of uncertainties including nonlinear perturbation and norm-bounded uncertainty are considered here. A novel Lyapunov-Krasovskii function that splits the whole delay interval into two subintervals and defines a different energy function on each subinterval is constructed. Using the Jensen inequality, some new delay-dependent robustly absolute stability criteria are presented in terms of strict linear matrix inequalities (LMI). Neither model transformation nor bounding technique for cross terms is required in obtaining the stability conditions. The neutral-delay and discrete-delay are taken into account. The numerical examples illustrate the effectiveness.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Fault detection and identification: Serial form versus simultaneous form

Fault detection and identification: Serial form versus simul...

引用

作者： Zhu, Zhibo Ge, Zhiqiang Song, Zhihuan Zhao, Li State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou 310027 Zhejiang China

ISBN: (纸本)9783902661937

Pattern recognition techniques have been widely applied for fault diagnosis. In this paper, two different forms, named serial form and simultaneous form, of pattern recognition based fault detection and identification systems are discussed. The optimal form is selected by a performance assessment rule which is based on the overall fault diagnosis system loss. Beside of considering the fault detection and isolation performance of the classifiers, the misclassification costs in both of the fault detection and isolation stages have also been considered for selecting the optimal form. In order to compare the performance of these two forms, two novel fault detection and isolation approaches integrating kernel principal component analysis (KPCA) and support vector data description (SVDD) are proposed subsequently. A simulation case study of Tennessee Eastman (TE) process is presented to evaluate the proposed fault detection and isolation methods. © 2011 IFAC.

关键词： Fault detection

来源：评论

学校读者我要写书评

暂无评论

control via interconnection and damping assignment of linear time-invariant systems is equivalent to stabilizability

Control via interconnection and damping assignment of linear...

引用

作者： Liu, Zhitao Ortega, Romeo Su, Hongye State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 China Laboratoire des Signaux et Systèmes CNRS-Supelec 91192 Gif-sur-Yvette France

ISBN: (纸本)9783902661937

In this brief note it is shown that the linear matrix inequalities that result from the application of interconnection and damping assignment passivity-based control to general linear time-invariant systems are feasible if and only if the system is stabilizable. A very simple proof of this fact is given that, in contrast to previous results, does not require the assumption that the system has no uncontrollable pole at s = 0. © 2011 IFAC.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Virtual Factory Integrated Manufacturing System for Process Simulation and Monitoring

引用

IFAC Proceedings Volumes 2011年第1期44卷 5219-5224页

作者： Zewei Zhou Yiping Feng Feng Zhu Gang Rong State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 P.R.China

Abstract A virtual factory integrated manufacturing system combined with system simulation and virtual reality is introduced in this paper. We describe the system architecture and development methodology, provide the working principle of process simulation and monitoring in virtual factory, and then explain the detailed applications of virtual factory integrated manufacturing system. With the visualization and three-dimensional human-computer interaction about process and production data, this platform can provide effective supports on monitoring, control and operation of manufacturing system.

关键词： simulation integration virtual reality intelligent manufacturing systems integrated plant control

来源：评论

学校读者我要写书评

暂无评论

引用

2011 IEEE International Conference on Service Operations, Logistics and Informatics, SOLI 2011

作者： Lin, Jia Tan, Ping He, Weiting Chu, Jian Chen, Zhihua State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University 38 Zheda Road 310027 Hangzhou China Zhejiang Insigma-Supcon Co.Ltd 525 Xixi Road 310013 Hangzhou China

ISBN: (纸本)9781457705731

As a large-capacity public transport tool, the railway system needs high stability and reliability. In order to reduce cost and satisfy the safety requirements of train control system, a novel safety-related digital input system is designed and implemented based on architectural constraints of safety-related systems and the analysis of the working principle of the specific digital input system. This system is designed as 2-out-of-3 architecture on the basis of vital computer. The method of fault diagnosis has been improved after the analysis of the practical situation. That is, the detection signal sent by the external pulse transmitter module contains the circuit fault information after the signal pass through the input circuit, and the real-time self-diagnosis will be done after using the supporting software to deal with timing diagram. The system uses less CPU resources to achieve the high diagnostic efficiency, which improves safety failure rate. And its failure analysis is discussed. The Markov Model is used to verify the Safety Integrity Level (SIL) of the safety-related system. The analysis shows that this design, with easy implementation and low cost, meets the requirements of SIL4 in railway and is more reliable. © 2011 IEEE.

关键词： Failure analysis

来源：评论

学校读者我要写书评

暂无评论

Novel Selenium-containing Human Single-chain Variable Fragment with Glutathione Peroxidase Activity from Computer-aided Molecular Design

引用

Chemical Research in Chinese Universities 2011年第5期27卷 813-819页

作者： WANG Cheng WAN Pei GONG Ping-sheng LV Li-min XU Ya-wei ZHAO Yang HE Bo ZHAO Gang YAN Gang-lin MU Ying LV Shao-wu LUO Gui-min Key Laboratory for Molecular Enzymology and Engineering Ministry of Education College of Life Science Jilin University Changchun 130012 P. R. China State Key Laboratory of Industrial Control Technology Research Center for Analytical Instrumentation Institute of Cyber-systems and Control Zhejiang University Hangzhou 310058 P. R. China Department of Biochemistry School of Basic Medical Sciences Jilin Medical College Jilin 132013 P. R. China

In order to enhance the glutathione peroxidase（GPX） catalytic activity of the selenium-containing single-chain variable fragments（Se-scFv）, a novel human scFv was designed on the basis of the structure of human antibody and optimized via bioinformatics methods such as homologous sequence analysis, three-dimensional（3D） model building, binding-site analysis and docking. The DNA sequence of the new human scFv was synthesized and cloned into the expression vector pET22b（＋）, then the scFv protein was expressed in soluble form in Escherichia coli BL21（DE3） and purified by Ni2＋-immobilized metal affinity chromatography（IMAC）. The serine residue of scFv in the active site was converted into selenocysteine（Sec） with the chemical modification method, thus, the human Se-scFv with GPX activity was obtained. The GPX activity of the Se-scFv protein was characterized. Compared with other Se-scFv, the new human Se-scFv showed similar efficiency for catalyzing the reduction of hydrogen peroxide by glutathione. It exhibited pH and temperature dependent catalytic activity and a typical ping-pong kinetic mechanism.

关键词： Glutathione peroxidase（GPX） Single-chain variable fragment（scFV） Three-dimensional model Selenium

来源：评论

学校读者我要写书评

暂无评论

Fitting a Functional Structural Plant Model based on Global Sensitivity Analysis

Fitting a Functional Structural Plant Model based on Global ...

引用

IEEE International Conference on Automation Science and Engineering

作者： Yubin LIN Mengzhen KANG Jing HUA National Key Laboratory of Pattern Recognition Institute of Automation Chinese Academy of Sciences State Key Laboratory of Management and Control for Complex Systems Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences

ISBN: (纸本)9781467304290

Calibration of a functional structural plant model is a challenging task because of the complexity of model structure. Parameter estimation through gradient-based optimization technique was highly dependent on initial parameter values. This motivated the use of global sensitivity analysis technique to choose parameter subset in fitting the data sequence. Global sensitivity indices were computed using the source sink ratio as the output of interest, which regulates all organ growth. By fitting on chrysanthemum data from nine sampling dates, it is shown that sensitivity analysts method helps to identify the influential parameters for a given sampling date. As a result, fitting process is less dependent on the initial parameter values. Current work provides a new method of calibrating a plant growth model with multiple outputs.

关键词： Sensitivity analysis plant models organ growth MACHINE SHOP PRACTICE

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：