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Comparisons between the three-phase current injection method and the forward/backward sweep method

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2010年第7期32卷 825-833页

作者： de Araujo, Leandro Ramos Ribeiro Penido, Debora Rosana Carneiro Junior, Sandoval Rezende Pereira, Jose Luiz Nepomuceno Garcia, Paulo Augusto Univ Fed Juiz de Fora Dept Elect Engn Juiz De Fora MG Brazil Univ Fed Rio de Janeiro Dept Elect Engn Rio De Janeiro Brazil

This paper presents comparisons of two power flow methodologies for distribution system analysis: the three-phase current injection method - TCIM and the forward/backward sweep - FBS. These techniques were applied for large scale three-phase distribution systems, the advantages and drawbacks are emphasized and their computational performances are presented. The results presented in this work can be helpful to decide which one of the tested methods is the most suitable to solve a particular electrical system. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Distribution systems Forward-backward sweep method object-oriented modeling Power flow analysis Three-phase current injection method Three-phase systems

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Development of a computer-aided concurrent net shape product and process development environment

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ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING 1997年第4期13卷 337-360页

作者： Chen, YM Natl Cheng Kung Univ Inst Mfg Engn Tainan 70101 Taiwan

This paper presents a systematic approach to developing a collaborative environment for computer-aided concurrent net shape product and process development. This approach includes the steps of (1) conventional development process analysis, (2) development process re-engineering, (3) computer-based system functional requirements analysis, (4) system framework design, and (5) system modeling, integration and implementation. This environment can support concurrent net shape product and process development by providing and integrating functions of product data management, process management and development advisory tools. The results of this research will facilitate the rationalization and automation of net shape product and process development and thus improve the efficiency and quality, and reduce the cost of net shape product development. IDEF structural analysis methodology was employed to capture the characteristics of net shape product and process development process, The concept of concurrent engineering was used to re-engineer the development process. The technology of system engineering was used to design the computer-aided system framework. object-oriented analysis, modeling and design methodology, knowledge engineering and data engineering techniques were employed for system modeling and implementation. (C) 1997 Elsevier Science Ltd.

关键词： concurrent engineering product data management information sharing object-oriented modeling system integration

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Modular dynamic virtual-reality modeling of robotic systems

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IEEE ROBOTICS & AUTOMATION MAGAZINE 1999年第4期6卷 13-23页

作者： Ferretti, G Filippi, S Maffezzoni, C Magnani, G Rocco, P Politecn Milan Dept Elect & Informat I-20133 Milan Italy

An integrated and efficient modular approach supported by an object-oriented database for modeling simulation, and 3-D animation.

关键词： dynamic modeling simulation virtual reality object-oriented database VRML modeling object-oriented modeling

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FORMALIZING COMPUTATIONAL RIVER NETWORKS

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COMPUTERS & INDUSTRIAL ENGINEERING 1994年第1-4期27卷 545-548页

作者： MA, SL HU, XL ACAD SINICA ECOENVIRONM SCI RES CTRBEIJING 100080PEOPLES R CHINA

We present a simple framework, called computational network, for formalizing river networks to provide a computer-based solution to problems of simulating concentrations of water quality constituents in river networks. The method was applied on a river network in Beijing-Tianjin area. The framework is developed by an object-oriented approach integrating the modelling of the static structure of river networks with that of the dynamic behavior of water quality constituents in them. Similar to artificial neural networks, computational networks can be used for learning, problem solving and controlling.

关键词： ENVIRONMENT ENGINEERING object-oriented modeling NEURAL NETWORKS

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A methodology for partitioning a vocabulary hierarchy into trees

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ARTIFICIAL INTELLIGENCE IN MEDICINE 1999年第1期15卷 77-98页

作者： Gu, H Perl, Y Geller, J Halper, M Singh, M New Jersey Inst Technol Dept Comp & Informat Sci Newark NJ 07102 USA Kean Univ Dept Math & Comp Sci Union NJ 07083 USA Ontyx Inc Ridgefield CT 06811 USA

Controlled medical vocabularies are useful in application areas such as medical information systems and decision-support systems. However, such vocabularies are large and complex, and working with them can be daunting. It is important to provide a means for orienting vocabulary designers and users to the vocabulary's contents. We describe a methodology for partitioning a vocabulary based on an IS-A hierarchy into small meaningful pieces. The methodology uses our disciplined modeling framework to refine the IS-A hierarchy according to prescribed rules in a process carried out by a user in conjunction with the computer. The partitioning of the hierarchy implies a partitioning of the vocabulary. We demonstrate the methodology with respect to a complex sample of the MED, an existing medical vocabulary. (C) 1999 Elsevier Science B.V. All rights reserved.

关键词： controlled medical vocabulary object-oriented modeling ontology semantic network partitioning

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Design of a combined cycle power plant model for optimization

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APPLIED ENERGY 2012年 98卷 256-265页

作者： Tica, Adrian Gueguen, Herve Dumur, Didier Faille, Damien Davelaar, Frans SUPELEC IETR F-35576 Cesson Sevigne France SUPELEC Syst Sci E3S F-91190 Gif Sur Yvette France EDF F-78400 Chatou France

Due to their numerous advantages, combined cycle power plants (CCPPs) have become an important technology for power generation. The part played by CCPPs on the power generation market includes frequent start-up/shutdown operations which must be optimized by means of innovative strategies, such as model-based methods. The availability of dedicated languages and libraries for physical system modeling facilitates the implementation of accurate large-scale models. However, the efficient resolution of optimization problems based on such models requires powerful algorithms, which impose a series of constraints on the model formulation, in particular, that of the lack of discontinuity source. This paper presents a method to transform a CCPP physical model designed for simulation in an optimization-oriented model, which can be further used with efficient algorithms to improve start-up performances. The methodology is based on the reformulation of the plant initially represented with discontinuity sources into a smooth model, by using continuous approximations of the Heaviside function. The validation results demonstrate the model consistency and emphasize the fact that it is accurate enough to be used for optimization and control purposes. (c) 2012 Elsevier Ltd. All rights reserved.

关键词： Combined cycle power plant Start-up object-oriented modeling Power plant control Optimization

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Hybrid system modeling using the SIMANLib and ARENALib Modelica libraries

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SIMULATION MODELLING PRACTICE AND THEORY 2013年 37卷 1-17页

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

The ARENALib and SIMANLib Modelica libraries replicate the basic functionality of the Arena simulation environment and the SIMAN language. These libraries facilitate describing discrete-event models using the Arena modeling methodology. ARENALib and SIMANLib models can be combined with other Modelica models in order to describe complex hybrid systems (i.e., combined continuous-time and discrete-event systems). The implementation and design of SIMANLib and ARENALib is discussed. The ARENALib components have been built in a modular fashion using SIMANLib. The SIMANLib components have been described as Parallel DEVS models and implemented using DEVSLib, a Modelica library previously developed by the authors to support the Parallel DEVS formalism. The use of Parallel DEVS as underlying mathematical formalism has facilitated the development and maintenance of SIMANLib. The modeling of two hybrid systems is discussed to illustrate the features and use of SIMANLib and ARENALib: firstly, a soaking-pit furnace;secondly, the malaria spread and an emergency hospital. DEVSLib, SIMANLib and ARENALib can be freely downloaded from http://***/. (c) 2013 Elsevier B.V. All rights reserved.

关键词： Modelica object-oriented modeling Hybrid systems Arena SIMAN Parallel DEVS

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Reconfigurable control of robotized manufacturing cells

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ROBOTICS AND COMPUTER-INTEGRATED MANUFACTURING 2007年第1期23卷 94-106页

作者： Bruccoleri, Manfredi Univ Palermo Dept Mfg Prod & Management Engn I-90128 Palermo Italy

This paper investigates the field of manufacturing system control. The addressed subject is indeed very fascinating, due to the importance that it has reached in the last decades both at research and industrial level. On the other hand, it seems to the author that most of the complexity intrinsic to the subject itself relies on the different meanings or levels of abstraction that both the terms "manufacturing system" and "control" may symbolize. The presented research aims to face the topic in a concrete fashion, i.e., by developing a control software system for a specific, although easy to be generalized, robotized manufacturing cell. Two different development methodologies, from the conceptual design to the actual implementation, of a cell control system are presented and compared. The former, based on ladder logic diagrams, for a PLC controlled manufacturing cell;the latter, based on object-oriented modeling and programming techniques, for a PC controlled manufacturing cell. The analysis has been conducted considering the internal and external requirements of the manufacturing system, mostly driven by the contemporary industrial need of reconfigurable control systems, largely acknowledged as the critical key to succeed in the new era of mass customization. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： object-oriented modeling reconfigurable control interlocking logic PLC-based control PC-based control

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Design of plant safety model in plant enterprise engineering environment

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RELIABILITY ENGINEERING & SYSTEM SAFETY 2001年第1期73卷 35-47页

作者： Gabbar, HA Suzuki, K Shimada, Y Okayama Univ Dept Syst Engn Okayama 7008530 Japan

Plant enterprise engineering environment (PEEE) is an approach aiming to manage the plant through its lifecycle. In such environment, safety is considered as the common objective for all activities throughout the plant lifecycle. One approach to achieve plant safety is to embed safety aspects within each function and activity within such environment. One ideal way to enable safety aspects within each automated function is through modeling. This paper proposes a theoretical approach to design plant safety model as integrated with the plant lifecycle model within such environment. object-oriented modeling approach is used to construct the plant safety model using OO CASE tool on the basis of unified modeling language (UML). Multiple views are defined for plant objects to express static, dynamic, and functional semantics of these objects. Process safety aspects are mapped to each model element and inherited from design to operation stage, as it is naturally embedded within plant's objects. By developing and realizing the plant safety model, safer plant operation can be achieved and plant safety can be assured. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： process safety plant safety plant safety model plant lifecycle modeling plant enterprise engineering object-oriented modeling UML OCL safety model PEEE

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modeling imprecise requirements with fuzzy objects

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INFORMATION SCIENCES 1999年第1-4期118卷 101-119页

作者： Lee, J Xue, NL Hsu, KH Yang, SJ Natl Cent Univ Dept Comp Sci & Informat Engn Software Engn Lab Chungli 32054 Taiwan

One of the foci of the recent development in object-oriented modeling (OOM) has been the extension of OOM to fuzzy logic to capture and analyze informal requirements that are imprecise in nature. In this paper, a new approach to object-oriented modeling based on fuzzy logic is proposed to formulate imprecise requirements along four dimensions: (1) to extend a class by grouping objects with similar properties into a fuzzy class, (2) to encapsulate fuzzy rules in a fuzzy class to describe the relationship between attributes, (3) to evaluate the membership function of a fuzzy class by considering both static and dynamic properties, and (4) to model uncertain fuzzy associations between classes. The proposed approach is illustrated using the problem domain of a meeting scheduler system. (C) 1999 Elsevier Science Inc. All rights reserved.

关键词： imprecise requirements object-oriented modeling requirements engineering

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