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11 篇 会议

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11 篇 电子文献
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检索条件"任意字段=IEE Colloquium on Model Building Aids for Dynamic System Simulation"

共 11 条记录，以下是1-10 订阅

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Experiences building and validating a large-scale dynamic paper machine model

Experiences building and validating a large-scale dynamic pa...

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作者： Wilson, David I. Balderud, Jonas Modelling and Simulation Group Karlstad University SE 651-88 Sweden Karlstad University SE-651 88 Karlstad Sweden

building and validating a dynamic model of a five layer paper-board machine is a nontrivial under-taking. Karlstad University in collaboration with Stora Enso have developed a dynamic model of a 5-ply board machine producing packaging board at Skoghall, Sweden. Three models were developed in decreasing order of complexity. First a detailed dynamic model of the short circulations was built using Simons IDEAS, which is a special purpose dynamic simulation package intended for the pulp and paper industry. This full model contained a comprehensive differential and algebraic equation set so consequently quickly became too unwieldy for the intended uses of troubleshooting, aiding retro-fits and model-based control studies. A slightly simplified version of this model was re-engineered in Simulink, dropping the algebraic constraint equations and implementing the transport delays in a more elegant manner. Finally transfer function models, suitable for online control and optimisation tasks were identified from production data with a structure given by semi-rigorous reasoning. All three models were adjusted and subsequently validated against almost one year of plant operating data. This paper highlights the difiiculties in validating a large industrial system with widely varying time constants, dubious transducers and the ubiquitous noise. We also discuss the necessary, but delicate, task of performing model reduction;contrast different simulation tools used at the various levels of model hierarchy and finally the paper demonstrates the use of simplified models to improve the performance of the adaptive IMC controller for the basis weight in the finished board.

关键词： Computer aided manufacturing

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iee colloquium on 'model building aids for dynamic system simulation' (Digest No.196)

IEE Colloquium on 'Model Building Aids for Dynamic System Si...

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iee colloquium on model building aids for dynamic system simulation

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QREMS-qualitative reasoning environment for modelling and simulation

QREMS-qualitative reasoning environment for modelling and si...

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iee colloquium on model building aids for dynamic system simulation

作者： D.A. Linkens S. Xia S. Bennett Department of Electrical Engineering & Electronics University of Sheffield Sheffield UK

Develops a qualitative reasoning environment for modelling and simulation (QREMS) of dynamic physical systems. In this environment, qualitative reasoning and numerical reasoning are integrated so that both qualitative models and numerical models can be represented and manipulated together. This environment supports model building in four aspects: graphical interface, automatic model generation, model explanation and validation.< >

关键词： simulation Computer aided engineering Explanation Graphical user interfaces Inference mechanisms

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Application of multibody systems techniques to vehicle modelling

Application of multibody systems techniques to vehicle model...

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iee colloquium on model building aids for dynamic system simulation

作者： A.N. Costa Department of Engineering University of Warwick UK

The objectives of the present work is to give an overview of multibody systems (MBS) modelling techniques with respect primarily to: historical developments; mathematical formalisms; and computer implementations. A MBS is defined as a mechanical system with many degrees of freedom. MBS modeling techniques can be used to perform the analysis and design studies of any mechanical system which can be modelled as a set of rigid bodies interconnected by joints, influenced by forces, driven by prescribed motion and restricted by constraints.< >

关键词： Design automation simulation dynamics Vehicles

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Graphical interface for the ESL simulation language

Graphical interface for the ESL simulation language

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iee colloquium on model building aids for dynamic system simulation

作者： J.G. Pearce Department of Electronic and Electrical Engineering University of Salford and ISIM Simulation Salford University Business Services Limited UK

The use of graphical techniques for model definition in simulation packages offers many advantages over conventional language definitions, in particular the higher level of simulation integrity possible with this approach. This paper describes some of the design philosophies and features of the graphical interface which forms part of the ESL simulation software suit. ESL (European Space Agency simulation Language) is a continuous systems simulation software environment, designed originally to meet the requirements of the European Space Agency for simulating spacecraft subsystems.< >

关键词： simulation Graphical user interfaces Programming environments simulation languages

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The use of symbolic algebra in multibody dynamic simulation

The use of symbolic algebra in multibody dynamic simulation

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iee colloquium on model building aids for dynamic system simulation

作者： P. Davison D.K. Longmore School of Mechanical Engineering University of Bath UK

Examines the effect of introducing flexibility within the elements of a shipborne multibody dynamic system. Flexibility could be concentrated at the joints or distributed along components. A Lagrangian based technique has been used with a minimum number of coordinates. Generating the Lagrangian and the equations of motion requires a powerful computer tool to handle the vector algebra and subsequent sorting procedures. REDUCE was selected as the best and most accessible package. It is written in RLISP, communicates in an ALGOL-like dialect and has a large set of functions, control structures and sorting procedures. New rules and definitions can be included which is essential for practical problem solving. The development of a symbolic model is split into three stages: Lagrangian development, analysis and sorting compatible equations.< >

关键词： Algebra simulation dynamics Marine vehicles Sorting Symbol manipulation

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Towards a universal modelling language

Towards a universal modelling language

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iee colloquium on model building aids for dynamic system simulation

作者： S.E. Mattsson M. Andersson Department of Automatic Control Lund Institute of Technology Lund Sweden

The authors have developed a new modelling language, based on ideas from object-oriented programming, called Omola. Omola is a universal modelling language. It uses differential and algebraic equations to represent behaviour and object-oriented concepts for structuring. The model is the basic structuring unit which, from an abstract point of view, consists of terminals, parameters and realizations. Terminals and parameters are interface variables directed at the dynamic environment of other variables and to the model user. models, terminals, parameters and realizations are represented in Omola as class definitions which can be stored in a model base and reused as model components. Inheritance can be used for defining specialized model classes based on more simple or general classes. A realization is a description of the behaviour of the model.< >

关键词： simulation Object oriented programming simulation languages

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eXCeS-an environment for building and managing dynamic system models

eXCeS-an environment for building and managing dynamic syste...

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iee colloquium on model building aids for dynamic system simulation

作者： H.A. Barker M. Chen P.W. Grant I.T. Harvey C.P. Jobling A.P. Parkman P. Townsend Dept. of Electr. & Electron. Eng. Wales Univ. Swansea UK Department of Mathematics and Computer Science University of Wales Swansea UK

eXCeS (extended X-window based control engineering workstation) is an open environment for supporting all stages of the design process for control systems. It is firmly based on the alternative approach described above, and has been designed using modern methods of software engineering. The eXCeS environment has been developed using the evolutionary approach. The first phase of development has provided the kernel of the environment including several generic tools, modules for data management and inter-tool communications and tools for block diagram construction and manipulation. Further tools and modules will be added later.< >

关键词： Design automation Control systems Data handling simulation Programming environments

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An intelligent simulation architecture for hazard and operability analysis of large-scale process plant

An intelligent simulation architecture for hazard and operab...

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iee colloquium on model building aids for dynamic system simulation

作者： S.M. Wang T. Holden C.C. Fan G.P. Wilhelmij Interactive Decision Support group Information Engineering Division University of Cambridge Cambridge UK

Develops a knowledge-based simulation architecture for the hazard and operability (HAZOP) analysis phase of large-scale process plant modelling. This work is motivated by the desire for a tool that allows a HAZOP expert to build and modify simulation models at a simulation-language independent level and without the constant presence of a simulation software expert. HAZOP is a safety analysis technique for identifying possible deviations from expected process-plant behaviour and highlighting the consequential operating difficulties. The analysis process generally takes the form of a qualitative and discrete simulation process that answers various 'what-if' questions. The input to the qualitative simulation is a logically complete set of guidewords, such as 'more flow', 'less flow', 'more temperature' etc. The results of the simulation are used to determine all possible states of plant units thereby helping to find the potential hazards.< >

关键词： simulation Manufacturing automation Knowledge acquisition Knowledge based systems Process control Safety

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Knowledge based hierarchical simulation of manufacturing organisations

Knowledge based hierarchical simulation of manufacturing org...

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iee colloquium on Artificial Intelligence in simulation

作者： H. Jiao K. Popplewell Department of Manufacturing Engineering Loughborough University of Technology UK

Investigates the possibility of building an integrated, knowledge based simulation model of a manufacturing system. The structure of the system is modelled in the IDEF0 format. However this structure is developed within a software environment supported by the STEM discrete event simulation package. This latter package runs in the ENVOS LISP/LOOPS AI workstation environment, and whilst it is primarily an object-oriented package it has an integral knowledge base facility allowing embedded expert systems. The dynamic behaviour of the functional elements of the IDEF0 structure is defined using STEM facilities.< >

关键词： simulation Workstations Knowledge based systems Manufacturing data processing

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