检索结果-内蒙古大学图书馆

modeling of hybrid control systems using the DEVSLib Modelica library

CONTROL ENGINEERING PRACTICE 2012年第1期20卷 24-34页

作者： Sanz, Victorino Urquia, Alfonso Cellier, Francois E. Dormido, Sebastian UNED ETSI Informat Dpto Informat & Automat Madrid 28040 Spain ETH Dept Comp Sci CH-8092 Zurich Switzerland

DEVSLib is a free Modelica library, developed by the authors, that supports the Parallel DEVS formalism. The library is mainly designed to model discrete-event systems. It also includes interfaces to communicate the DEVSLib models with the rest of the Modelica libraries. Thus, the library can be used in the development of multi-domain and multi-formalism hybrid models using the object-oriented methodology supported by Modelica. This manuscript presents the hybrid system modeling capabilities included in DEVSLib. In particular, these functionalities are applied to the description of hybrid control systems. A case study of a supermarket refrigeration system, using the traditional control approach, is discussed. Three implementations of the plant and its controllers have been developed and are described. The system is simulated reproducing the day and night conditions, and the results from the three implementations are compared. DEVSLib is freely available for download at http://***. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： object-oriented modeling Hybrid control Modelica Parallel DEVS

来源：评论

学校读者我要写书评

暂无评论

An integrated modeling approach for shop-floor scheduling and control problem of flexible manufacturing systems

引用

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 2012年第9-12期59卷 1127-1142页

作者： Tuncel, Gonca Dokuz Eylul Univ Dept Ind Engn TR-35160 Buca Izmir Turkey

Increasing automation and complexity of today's production systems affect the constraints of real-world shop-floor control and scheduling problems. To deal with these constraints, either the existing modeling and analysis techniques were improved or new scheduling approaches were developed. This study attempts to propose an object-oriented approach for modeling and analysis of shop-floor scheduling problem of flexible manufacturing systems (FMSs) using high-level Petri Nets (PNs). The graphical nature and mathematical foundation has made PN-based methods appealing in real-time scheduling and control of FMSs. In the proposed approach, we firstly construct an object-modeling diagram of an FMS and develop a heuristic rule-base to solve the resource contention problem then formulate the dynamic behavior of the system by high-level PNs. The modeling methodology is illustrated by an FMS, and the proposed rule-based system is compared with several dispatching rules with respect to part flow time and tardiness-related performance measures.

关键词： Flexible manufacturing systems Shop-floor scheduling Petri nets object-oriented modeling

来源：评论

学校读者我要写书评

暂无评论

Development of virtual-labs for education in chemical process control using Modelica

引用

COMPUTERS & CHEMICAL ENGINEERING 2012年 39卷 170-178页

作者： Martin-Villalba, Carla Urquia, Alfonso Dormido, Sebastian UNED Dept Informat & Automat Madrid 28040 Spain

Virtual-labs are useful tools for education in chemical process control. A novel approach to virtual-lab implementation using the Modelica language is presented. This approach has the following advantages. Firstly, existing Modelica models can be employed to develop virtual-labs. If new models need to be programmed, the use of Modelica reduces considerably the modeling effort. Secondly, as the complete virtual-lab is described in Modelica, virtual-lab developers don't need to use programming languages. Finally, virtual-labs can be easily distributed to the users, who don't need to install any additional software. The proposed approach is based on the application of a methodology for interactive model development, and two software tools: a free Modelica library, named Interactive (http://***/Interactive), and the Dymola modeling environment. Several virtuallabs have been implemented and successfully applied to education in chemical process control. The development of a virtual-lab based on a complex model of a double-pipe heat exchanger is discussed. (c) 2011 Elsevier Ltd. All rights reserved.

关键词： Chemical process education Control education Virtual laboratory Modelica object-oriented modeling

来源：评论

学校读者我要写书评

暂无评论

A Comparative Study of the EUREQA Tool for End-User Development

引用

INTERNATIONAL JOURNAL OF INFORMATION SYSTEM modeling AND DESIGN 2012年第3期3卷 66-87页

作者： Austrem, Paul G. Univ Bergen Informat Sci Bergen Norway Webstep AS Trondheim Norway

End-user development is a growing domain;however, few dedicated end-user development tools exist allowing end-users to incorporate their domain knowledge into software solutions. EUREQA is a design pattern driven UML class diagram modeling tool allowing end-user developers to create UML class diagram models reflecting their domain knowledge. The UML class diagram can be used as a basis for model-driven development. EUREQA was evaluated with 20 participants recording data through direct observation, screen recordings, the think-aloud protocol and semi-structured interviews. Half of the participants used EUREQA and the other half used the Microsoft Visio modeling tool. The authors found that EUREQA participants scored higher than Visio participants for this task and that skill had less effect on the EUREQA participants' solutions. Specifically inexperienced EUREQA users struggled less when working with UML class diagram elements compared to Visio participants.

关键词： Design Patterns End-User Development Information Systems object-oriented modeling Tool Support

来源：评论

学校读者我要写书评

暂无评论

Bi-relational P/T Petri Nets and the modeling of Multithreading object-oriented Programming Systems

Bi-relational P/T Petri Nets and the Modeling of Multithread...

引用

International Conference on Digital Information Processing and Communications (ICDIPC 2011)

作者： Martinik, Ivo VSB Tech Univ Ostrava Fac Econ Ostrava 70121 1 Czech Republic

ISBN: (纸本)9783642223884

Bi-relational P/T Petri nets are the newly introduced class of Petri nets, whose implementation and definitions are the main topics of this paper;they feature certain new and original concepts when compared with conventional P/T Petri nets, which can be successfully used at a design. modeling and verification of multithreading object-oriented programming systems executing in parallel or distributed environment. In this paper basic characteristics of hi-relational P/T Petri nets are very briefly presented including possibilities in their definition of newly introduced net static pages and dynamic pages. net dynamic pages instances and their possible dynamic creation and destruction, functionalities of multiarcs and the mechanism of the execution of transitions at the modeling of object-oriented programming systems. The concept of subpages of net pages and its application in the modeling of the declared static and non-static variables and methods including the class inheritance and polymorphism, is also of an interest. Basic principles of bi-relational P/T Petri nets could be then further applied when defining the hi-relational object Petri Nets.

关键词： Petri nets bi-relational net page multiarc object-oriented modeling class

来源：评论

学校读者我要写书评

暂无评论

An object-oriented Approach to the Development of Liquid Cargo Handling Simulators in TRANSAS

引用

IFAC Proceedings Volumes 2012年第2期45卷 369-373页

作者： Sergey V. Tarasov Dmitry V. Kiptily Dmitry V. Lebedev Technological Simulator Department TRANSAS Technologies (ZAO) 54-4 Maly pr. V.O. St.Petersburg 199178 Russian Federation (Tel: +7-812-325-3131)

Abstract An object-oriented technology of physical modeling, employed for development of multi-component models for marine technological simulators of TRANSAS Technologies company, is presented. Modern liquid cargo handling simulators include wide range of systems, which require development of interactive mathematical models, working in real time. Requirements for physically correct modeling of behavior of system components in different operating states, necessary to allow the proper training, are considered. The complexity of the modeled systems leads to the usage of object-oriented approach, based on the model-based design methodology. Application of “RanD Model Designer” visual modeling software for development of such multi-component models is outlined. The standard components library is described, which has been created on the basis of the object-oriented analysis of the application domain. These components represent the hybrid dynamic behavior of the devices, which are typical for ship cargo handling and auxiliary systems, modeled in the simulator. The ways of simplification of the compound equation system, facilitating the real time calculations, are considered. Resulting mathematical models are used within the Liquid Cargo Handling Simulators, produced by TRANSAS Technologies.

关键词： simulators physical models mathematical models real-time systems object-oriented modeling

来源：评论

学校读者我要写书评

暂无评论

object-oriented modeling of complex mechatronic components for the manufacturing industry

引用

IEEE-ASME TRANSACTIONS ON MECHATRONICS 2007年第6期12卷 696-702页

作者： Secchi, Cristian Bonfe, Marcello Fantuzzi, Cesare Borsari, Roberto Borghi, Davide Univ Modena & Reggio Emilia Dept Sci & Methods Engn I-42100 Reggio Emilia Italy Univ Ferrara Engn Dept Ferrara I-44100 Ferrara Italy Tetra Pak Carton Ambient I-41100 Modena Italy

The advantages of object-oriented modeling, as modularity and reusability of components, are very important not only for software development but also for modeling manufacturing systems. Recently, a unified object-oriented approach for modeling both the logical and the physical part of a manufacturing machine has been proposed. In this paper, we show the effectiveness of this new modeling framework on an industrial application. The case study consists of the package forming unit of a filling machine for liquid food packaging, developed by Tetra Pak Carton Ambient S.p.A.

关键词： bond graphs manufacturing systems object-oriented modeling

来源：评论

学校读者我要写书评

暂无评论

An object-oriented framework applied to the study of electromechanical oscillations at Tucurui hydroelectric power plant

引用

ELECTRIC POWER SYSTEMS RESEARCH 2011年第12期81卷 2081-2087页

作者： Sena, Jose A. S. Fonseca, Maria C. P. Di Paolo, Italo F. Barra, Walter, Jr. Barreiros, Jose A. L. Costa, Carlos T., Jr. Nogueira, Fabricio G. Univ Fed Para UFPA Fac Engn Eletr Inst Tecnol BR-56075110 Belem Para Brazil Centrais Eletr Norte Brasil Eletronorte BR-66115000 Belem Para Brazil

This paper presents an object-oriented framework to perform dynamical studies in electrical power systems. The proposed methodology is also useful to the development, upgrade and maintenance of software for power system studies. The framework was designed to be used by developers of power system software. Based on software engineering concepts, user's requirements are, firstly, mapped to atomic classes which, in turn, are subsequently used to build state-space representation for each dynamic device in the power system under study, such as electrical generators, turbines and automatic controllers. The developed framework automates the whole process of building a global system model, providing a standard space-state model suitable for implementing by direct code in C++ language. By using the proposed methodology, a power system simulation tool was specially developed to study electromechanical phenomena observed at Tucurui hydroelectric power plant, a large power plant of the Brazilian Interconnected Power System. The results were validated by comparing the simulated to the actual plant response obtained from field tests carried out at the Tucurui power plant. The results have shown a very good level of performance of the developed simulator system. The simulator was able to reproduce the dominant dynamical phenomena observed at the Tucurui power plant. (C) 2011 Elsevier B.V. All rights reserved.

关键词： object-oriented modeling Framework Dynamic simulation Electrical power plant

来源：评论

学校读者我要写书评

暂无评论

An approach to distributed building modeling on the basis of versions and changes

引用

ADVANCED ENGINEERING INFORMATICS 2011年第2期25卷 297-310页

作者： Koch, Christian Firmenich, Berthold Ruhr Univ Bochum Inst Computat Engn Akad Rat D-44801 Bochum Germany CADEMIA Consult GmbH D-65719 Hofheim Germany

Actors involved in the computer-supported design process work together towards a common goal - the design of a building. Current collaboration approaches often focus on versioned and distributed building models, which describe virtual building states on the basis of the object-oriented method. State changes (for example moving a wall or modifying its material) remain unconsidered and lead to inconsistency problems when exchanging, comparing and merging versioned building models. This paper presents a new modeling approach that combines existing state-oriented descriptions of a virtual building with additional change-oriented information by means of design steps denoted as modeling operations. A new language is defined for the formal description of modeling operations. These operations establish a standardized processing interface for existing building models, can represent design intents, enhance current models with change semantics and add to the consistency of these models. Moreover, this paper presents new concepts for intra-domain collaboration and model management that overcome current limitations when exchanging, comparing and merging versioned building models. The pilot implementation and some project scenarios in industry verify that current design processes can benefit in principle from combined state-oriented and change-oriented building information. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Collaboration Versioning Change management object-oriented modeling Building information modeling Diff and merge

来源：评论

学校读者我要写书评

暂无评论

object-oriented modeling framework for integration of computer applications in structural engineering

Journal of Structural Engineering (Madras)

引用

Journal of Structural Engineering (Madras) 2007年第6期33卷 465-477页

作者： Appa, Rao, T.V.S.R. Nowshad, Mohammed, C. Structural Engineering Research Centre Chennai - 600113 India

Computer applications in different areas of structural engineering such as analysis, design, construction and project management are mostly written in procedure-oriented languages and they are presently fragmented in nature. It is well-recognised that use of integrated computer applications would lead to saving in time and cost in design and construction of structures and infrastructural facilities. Vigorous efforts are being made world-wide to develop methodologies for integration by making use of latest developments in Information and Communication Technologies (ICT) such as object-oriented modeling, information/data exchange standards, integrated data bases, 3-D/4-D modeling, virtual reality, network and world-wide web. object-oriented modeling is being used in all these technologies to facilitate integration and extensibility. The paper presents an object-oriented framework for integrating legacy computer applications in structural engineering. Details of an object-oriented model for integrating legacy computer applications of analysis and design of RC frames are presented by using the Unified modeling Language (UML) and the Case Tool : Rational Rose. Working of the OO model has been demonstrated with an example of implementation of integration of legacy structural analysis and design programs for design of an RC frame.

关键词： Information and communication technologies object-oriented modeling Project management Structures Unified modeling language

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：