检索结果-内蒙古大学图书馆

Start-Up of Process Plants by Conservative Learning Based Qualitative Reasoning

IFAC Proceedings Volumes 1994年第3期27卷 301-306页

作者： Zs. Csáki K.M. Hangos Systems and Control Laboratory Computer and Automation Institute Hungarian Academy of Sciences 1518 Budapest P.O.Box 63. Hungary

A model conservative learning method is proposed in this paper which is able to transfer knowledge between different qualitative differential equation models of the same szstem. This is an essentialstep of generating operating procedures when multiple models with overlapping validity regions must be used to describe the controlled szstem over a wide operating range. The method is based on our previous results on introducing learning into Extended Qualitative Simulation by Bayesian identification and output prediction.

关键词： Qualitative Reasoning learning process control Bayesian identification start-up procedures

来源：评论

学校读者我要写书评

暂无评论

QUALITATIVE MODEL-BASED VERIFICATION OF OPERATING PROCEDURES BY HIGH-LEVEL PETRI NETS

引用

computerS & CHEMICAL ENGINEERING 1994年第Sup1期18卷 S565-S569页

作者： GERZSON, M CSAKI, Z HANGOS, KM Systems and Control Research Laboratory Computer and Automation Institute Hung. Acad. Sci. H-1518 Budapest P.O. Box 63 Hungary

The presence of colored tokens and time opens the possibility to combine high level Petri nets for describing operating procedures and constraint type qualitative models describing the model of the system over a wide operating range. Places can be associated to state variables and the color of the tokens can be related to the qualitative value of the variable. Are expressions correspond to qualitative model equations. A suitably modified version of the order of magnitude qualitative value representation form is used together with a scaling of each variable to have the same uniform qualitative range. Operations are performed on the interval arithmetic basis and only the result is transformed back to the uniform order of magnitude quantity space. This computation method ensures advantageous algebraic properties. Based on the above idea a novel verification method is proposed in this paper for testing operating procedures against a qualitative model of the system using a high level or colored Petri net representation of the procedure and the model together.

关键词： COLORED PETRI NETS CONSTRAINT TYPE QUALITATIVE MODEL OPERATING PROCEDURES

来源：评论

学校读者我要写书评

暂无评论

A Simulation, Environment for Eyaluation of Kowledge Based Fault Diagnosis Systems

引用

IFAC Proceedings Volumes 1994年第10期27卷 59-64页

作者： Alenka Žnidaršič Victor J. Terpstra Henk B. Verbruggen Jožef Stefan Institute Department of Computer Automation and Control Jamova 39 61111 Ljubljana Slovenia Delft University of Technology Department of Electrical Engineering. Control Laboratory P.O. Box 5031. 2600 GA Delft The Netherlands

In the paper a simulation environment for evaluation of knowledge based fault diagnostic systems is presented. The contribution deals with the concept of the environment that provides an integration of qualitative and quantitative models. This concept is presented on a simulated water-column process controlled by feedback. The simulation environment is used to evaluate the potentials of Multilevel Flow Modelling (MFM) approach to system diagnosis. The environment is realized within the real-time expert system tool G2.

关键词： Fault diagnosis multilevel flow models simulation model-based reasoning

来源：评论

学校读者我要写书评

暂无评论

Computational architectures for the control of underwater robots

Computational architectures for the control of underwater ro...

引用

OCEANS

作者： P. Baiardi P. Bianchetti G. Bruzzone G. Cannata G. Casalino G. Veruggio DIST Department of Communication Computer and Control Sciences University of Genova Genoa Italy IAN-CNR Naval Automation Institute National Research Council Genoa Italy

The objective of this paper is to present the current activities, jointly carried out by DIST and LAN, in the development of a computational architecture for the control of advanced robot systems. In particular, the activity is focused on marine and underwater applications. The problem of the control of advanced robot systems is discussed. A Lyapunov based approach to the synthesis of the control laws in task space domain is presented. Moreover, experimental setups implementing the proposed control scheme are briefly described.< >

关键词： computer architecture Robot control Robot kinematics Robotics and automation Machine vision Automatic control Communication system control control systems Humans Robot sensing systems

来源：评论

学校读者我要写书评

暂无评论

System identification with generalized orthonormal basis functions

System identification with generalized orthonormal basis fun...

引用

IEEE Conference on Decision and control

作者： P.M.J. Van den Hof P.S.C. Heuberger J. Bokor Mechan. Engin. Systems and Control Group Delft University of Technnology Delft Netherlands National Institute of Public Health and Environmental Protection (RIVM) Bilthoven Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

A least squares identification method is studied that estimates a finite number of expansion coefficients in the series expansion of a transfer function, where the expansion is in terms of generalized basis functions. The basis functions are orthogonal in H/sub 2/ and generalize the pulse, Laguerre and Kautz (1954) bases. The construction of the basis is considered and bias and variance expressions of the identification algorithm are discussed. The basis induces a new transformation (Hambo transform) of signals and systems, for which state space expressions are derived.< >

关键词： System identification Transfer functions Least squares approximation Automatic control control systems Network address translation Public healthcare automation State-space methods Hilbert space

来源：评论

学校读者我要写书评

暂无评论

A graph-theoretic approach to integrated process and control system synthesis

引用

IFAC Proceedings Volumes 1994年第7期27卷 61-66页

作者： K.M. Hangos F. Friedler J.B. Varga L.T. Fan Systems and Control Research Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest Pf. 63 Hungary Department of Systems Engineering Research Institute of Chemical Engineering Hungarian Academy of Sciences H-8201 Veszprim Pf 125 Hungary Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA

A graph-theoretic method for integration of process and control system (IPCS) syntheses has been proposed in the present paper. The foundation of this integration is a well-established, graph-theoretic approach to process synthesis in conjunction with the analysis of structural controllability based on digraph-type process models. A directed bipartite graph, the CP-graph, has been introduced for unambiguous representation of an IPCS structure. The notion of CP-graph has given rise to a set of axioms for describing the combinatorially feasible and controllable structures. The maximal controllable structure of an IPCS synthesis problem has been defined as the union of combinatorially feasible and controllable IPCS structures; obviously, the optimal IPCS structure must be a substructure of this maximal controllable structure. Thus, the mathematical programming model, e.g., MINLP model, of an IPCS synthesis problem should be derived from the maximal controllable structure. The fundamental combinatorial algorithm of IPCS synthesis, i.e., algorithm CMSG, for identifying this maximal controllable structure has been formulated. The complexity of this algorithm has been proved to be polynomial on the size of the problem; its efficacy is illustrated with a relatively simple example. The resultant IPCS structures are compared with the structures synthesized without considering their control systems.

关键词： Process control control system synthesis structural controllability combinatorial mathematics synthesis methods

来源：评论

学校读者我要写书评

暂无评论

Identification with Generalized Orthonormal Basis Functions - Statistical Analysis and Error Bounds

引用

IFAC Proceedings Volumes 1994年第8期27卷 1169-1174页

作者： P.M.J. van den Hof P.S.C. Heuberger J. Bokor Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands National Institute of Public Health and Environmental Protection (RIVM) P.O. Box 1 3720 BA Bilthoven The Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H 1502 Budapest Hungary

A least squares identification method is studied that estimates a finite number of expansion coefficients in the series expansion of a transfer function, where the expansion is in terms of recently introduced generalized basis functions. The basis functions are orthogonal in H 2 and generalize the pulse, Laguerre and Kautz bases. One of their important properties is that when chosen properly they can substantially increase the speed of convergence of the series expansion. This leads to accurate approximate models with only few coefficients to be estimated. Explicit bounds are derived for the bias and variance errors that occur in the parameter estimates as well as in the resulting transfer function estimates.

关键词： System identification orthogonal basis functions FIR models linear regression modelling errors system approximation

来源：评论

学校读者我要写书评

暂无评论

MODULA-2 BASED MULTITASKING ENVIRONMENT FOR A FLEXIBLE BIPROCESSOR controlLER

引用

MICROPROCESSORS AND MICROSYSTEMS 1993年第2期17卷 83-91页

作者： GODENA, G PETROVCIC, J J. Stefan Institute Department of Computer Automation and Control PO Box 100 Jamova 39 61111 Ljubljana Slovenia

This paper presents the most important issues of a real-time software package developed for the industrial multiloop controller MMC-90. MMC-90 is a biprocessor system based on the concept of a two-level controller. On the lower level of complexity, the base control processor performs the basic control functions. On the higher level of complexity, the flexible control coprocessor executes complex functions on request from the control tasks on the base control processor. All the software on the control coprocessor is written in Modula-2. The corresponding multitasking environment was designed as a set of Modula-2 libraries at various horizontal and vertical decomposition levels. On the control coprocessor a preemptive, priority based scheduler as well as a high level interprocess communication and synchronization mechanism has been developed. Communication between the processors is realized by means of a fast bi-directional communication channel, which is implemented via dual-port RAM. The developed system opens the door to applications of modem control algorithms in industrial practice.

关键词： REAL-TIME PROGRAMMING LANGUAGES MODULA-2 SOFTWARE DESIGN MICROPROCESSOR control

来源：评论

学校读者我要写书评

暂无评论

The Twenty‐first Century Enterprise, Agile Manufacturing and Something Called CALS

World Class Design to Manufacture

引用

World Class Design to Manufacture 1994年第3期1卷

作者： Eric M. Ross The Vice‐President of ProActive Resources Inc. a Rhode Island‐based industrial improvement consulting and training firm. He also serves as the Chair Commercial Application Task Group of the all‐volunteer US CALS/CE Industry Steering Group. Previously he was Director CALS at Intergraph Corporation a worldwide supplier of interactive computer graphic CAD/CAE/CAM systems and Program Director Strategic Enterprise Modernization at BDM International Inc. Mr Ross also served in various technical management and leadership positions in United States Air Force internal and contractor industrial base improvement programmes. He is a member of the American Society for Quality Control the American Production and Inventory Control Society the Automation Forum and the Computer and Automated Systems Association of the Society of Manufacturing Engineers. He holds a BS and an MS degree from Rensselaer Polytechnic Institute and the State University of New York College of Ceramics respectively. He can be contacted at ProActive Resources Inc. Tel/Fax: 401 421 4072 or 10733 Basket Oak Ct. Burke VA 22015 USA.

Success in the twenty‐first century will require many manufacturingenterprises to have the innovative flexibility to respond rapidly tomarket desires, to produce top quality products, to deliver almostinstantaneously, and to provide superb service. Built on leanmanufacturing, the agile manufacturing paradigm is an evolutionary step,partially based on a combination of flexible manufacturing, integratedproduct development and stratgic partnering. An agile manufactuingenterprice is a dynamically reconfigurable organization of independentcompanies which forms individual companies optimized for the specificsof each market opportunity. Key to the success of such a paradigm is theability (for often geographically dispersed functions) to share fullythe technical information required and used for product design,development, validation, production and service. Argues that CALS, astandardized approach to integrated product data management, has thestrategies, approaches, technologies and neutral data formats as well asthe growing international commitment to enable this data sharing.

关键词： Agile production computer‐aided acquisition and logistic support Co‐operation Flexible organizations Information exchange Manufacturing industry Partnering Product development

来源：评论

学校读者我要写书评

暂无评论

Grey Dynamics of Heat Exchanger Networks

引用

IFAC Proceedings Volumes 1993年第2期26卷 493-498页

作者： E.I. Varga J. Bokor K.M. Hangos Systems and Control Laboratory Computer and Automation Research Institute of Hungarian Academy of Sciences H-1518 Budapest POB 63 Hungary

A robust modeling method of Heat Exchanger Networks (HENs) with structured parametric perturbations has been described in this paper which results in a LFT form. The LFT of the overall HEN system can be generated algorithmically from the model of the heat exchangers and from the network topology. Based on these modeling paradigms the effect of uncertainties represented by specific Δ block structures have been analysed by frequency domain n analysis in order to get an insight into the causes of potential large overshoot-type responses. The proposed method has been illustrated on the simple example of a countercurrent heat exchanger with by-pass.

关键词： Process models heat exchangers chemical industry modeling state space system analysis robustness dynamics of HENs parametric uncertainty modeling μ analysis

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：