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Proceedings of the 1994 ASME International Computers in Engineering Conference and Exhibition. Part 1 (of 2)

作者： Daberkow, Andreas Schiehlen, Werner Univ of Stuttgart Stuttgart Germany

ISBN: (纸本)9780791813805

The increasing use of computer aided design (CAD) and multibody dynamics software in engineering design and analysis requires an efficient communication management between different codes. As product cycle times are shrinking and companies are under competitive pressure, an automation of the model data exchange between CAD and multibody dynamics is urgently demanded. In this paper the concept, development and implementation of the independent, object-oriented multibody modeling kernel DAMOS-C is presented. According to the different multibody formalisms, computer codes and applications in vehicle, machine and robot dynamics a general description and organization of multibody system data is introduced. A general data model is developed to fulfill the needs of a modular simulation system based upon numerical and symbolical formalisms. With respect to existing CAD interfaces, different solid model construction methods and visualization procedures, multibody system classes and methods are implemented in the multibody modeling kernel. The extreme versatility of this modeling kernel is shown by an integration in a commercially available CAD-system and by application to a conversion tool which processes input data for different multibody software codes.

关键词： Computer aided engineering

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Extending object oriented control models for intelligent manufacturing systems

Extending object oriented control models for intelligent man...

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Proceedings of the 16th IEEE/CPMT International Electronics Manufacturing Technology (IEMT) Symposium. Part 1 (of 2)

作者： Hirschfeld, Robert A. Ken Keys, L. Louisiana State Univ Baton Rouge United States

The Intelligent Manufacturing Research initiative at Louisiana State University has designed and implemented an object oriented control model for a simple manufacturing cell. Using object oriented programming and design has allowed the internal program structure (virtual cell space) to closely match the physical cell construction (physical cell space). This paper discusses the second phase of the cell implementation in which the existing C++ objects were implemented as autonomous units under operating system control. The operating system used is Microsoft(R) WindowsTM and Windows for WorkgroupsTM 3.1. Since each object is autonomous, they can assume the properties of self-monitoring agents in the system rather than simple request servers under the sole control of the calling object. Communication between objects is facilitated by the operating system using dynamic data exchange (DDE) calls or by compiling the module into dynamic link library (DLL) modules. This arrangement of system control architecture increases system autonomy, concurrency, and easy of use for a relatively small overhead penalty.

关键词： Computer integrated manufacturing

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CORBA implementation issues

CORBA implementation issues

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IEE colloquium on Distributed object Management

作者： S. Baker OE28099Reilly Institute IONA Technologies Dublin Ireland

The Common object Request Broker Architecture (CORBA) is an important standard for distributed object oriented systems. It is defined by the object Management Group (OMG)-an open consortium of 300 companies and institutions. Its aim is to provide support for the use and management of objects in a distributed system of heterogeneous machines and operating systems. These objects can be the components of a distributed application; or they could be applications themselves which provide a CORBA interface to allow usage by client programs on the same or on different machines in the network. The Orbix system is an implementation of the CORBA standard, with a C++ language binding-allowing programmers to write distributed applications using C++.< >

关键词： Network operating systems object oriented languages object oriented programming Parallel programming Standards

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Abstract simulator for the parallel DEVS formalism 5

Abstract simulator for the parallel DEVS formalism

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5th Annual Conference on AI, Simulation, and Planning in High Autonomy systems: Distributed Interactive Simulation Environments, AIHAS 1994

作者： Chow, A.C. Zeigler, B.P. Kim, Doo Hwan Object Technol. Products IBM Corp. AustinTX78758 United States Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

ISBN: (纸本)0818664401

A parallel discrete-event simulation (DEVS) formalism which exploits the parallelism of transition collisions in the simulation of DEVS models is considered. We present a design for the abstract simulator needed to prove the formalism's soundness and to serve as a reference for implementation. The abstract simulator is composed of cooperating simulation engines, (simulators and coordinators) that use bag-like messages to synchronize the parallel activities that are distributed across autonomous asynchronous processors. The approach suggests engines that are efficient in both sequential and distributed/parallel environments. After describing the abstract simulator we briefly discuss a prototype implementation that affords a high degree of flexibility by mechanizing the "closure under coupling" property of the parallel DEVS formalism and the characteristics of object-oriented systems. © 1994 IEEE.

关键词： Discrete event simulation

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Software support for configuring distributed object based systems

Software support for configuring distributed object based sy...

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IEE colloquium on Distributed object Management

作者： J. Kramer Department of Computing Imperial College London London UK

There is some consensus on the set of techniques and mechanisms which should be used to construct distributed systems. However, none of these mechanisms help in the design process of decomposing an overall application into a set of components nor in its subsequent construction. They are rather the 'glue' used to compose components such that they may communicate and interact. What is missing is any motion of structure. The premise of the author's approach is that a separate, explicit structural (configuration) description is essential for all phases in the software development process for distributed systems, from system specification as a configuration of component specifications to evolution as changes to a system configuration. Descriptions of the constituent software components and their interconnection patterns provide a clear and concise level at which to specify and design systems, and can be used directly by construction tools to generate the system itself. The author uses the neutral term 'component' to mean a software entity which encapsulates some resources and provides a well defined interface in terms of the operations it provides to access the resources and the operations it requires to implement its functionality. Further, these components must be 'context independent' in that they use only local names to communicate with their environment, thereby allowing them to be developed independently of the context in which they execute.< >

关键词： Software requirements and specifications object oriented methods object oriented programming Parallel programming

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TAU: A portable parallel program analysis environment for pC++ 3rd

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3rd Joint International Conference on Vector and Parallel Processing, CONPAR 1994 - VAPP VI

作者： Mohr, Bernd Brown, Darryl Malony, Allen Department of Computer and Information Science University of Oregon EugeneOR97403 United States

ISBN: (纸本)9783540584308

The realization of parallel language systems that offer high-level programming paradigms to reduce the complexity of application development, scalable runtime mechanisms to support variable size problem sets, and portable compiler platforms to provide access to multiple parallel architectures, places additional demands on the tools for program development and analysis. The need for integration of these tools into a comprehensive programming environment is even more pronounced and will require more sophisticated use of the language system technology (i.e., compiler and runtime system). Furthermore, the environment requirements of high-level support for the programmer, large-scale applications, and portable access to diverse machines also apply to the program analysis tools. In this paper, we discuss T (TAU, Tuning and Analysis Utilities), a first prototype for an integrated and portable program analysis environment for pC++, a parallel object-oriented language system. T is integrated with the pC++-system in that it relies heavily on compiler and transformation tools (specifically, the Sage++ toolkit) for its implementation. This paper describes the design and functionality of T and shows its application in practice. © Springer-Verlag Berlin Heidelberg 1994.

关键词： object oriented programming

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Distributed real-time objects: the ANSA approach

Distributed real-time objects: the ANSA approach

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Workshop on object-oriented Real-Time Dependable systems (WORDS)

作者： Guangxing Li APM/ANSA Limited Cambridge UK

ISBN: (纸本)0818670835

object orientation, distributed computing and real time computing are well established research areas, but their integration are yet to be studied, because they seldom use compatible techniques. The paper reviews some experiences in the design, implementation and performance evaluation of two object based system environments for distributed real time applications. The two environments are based on the ANSA Open Distributed Processing architecture and its example implementation ANSAware. The focus of the article is the engineering mechanisms necessary to extend ANSAware to support real time computing.

关键词： Real time systems Distributed computing Computer architecture object oriented modeling Control systems Workstations Software systems Manufacturing design engineering ISO

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Concept, development and implementation of DAMOS-C: the object orientied approach to multibody systems

Concept, development and implementation of DAMOS-C: the obje...

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作者： Daberkow, Andreas University of Stuttgart

The increasing use of computer aided design (CAD)and multibody dynamics software in engineering design and analysis requires an efficient communication management between different codes. As product cycle times are shrinking and companies are under competitive pressure, an automation of the model data exchange between CAD and multibody dynamics is urgently demanded. In this paper the concept. development and implementation of the independent, object-oriented multibody modeling kernel DAMOS-C is presented. According to the different multibody formalisms, computer codes and applications in vehicle, machine and robot dynamics a general description and organization of multibody system data is introduced. A general data model is developed to fulfill the needs of a modular simulation system based upon numerical and symbolical formalisms. With respect to existing CAD interfaces, different solid model construction methods and visualization procedures, multibody system classes and methods are implemented in the multibody modeling kernel. The extreme versatility of this modeling kernel is shown by an integration in a commercially available CAD-system and by application to a conversion tool which processes input data for different multibody software codes.

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Methods and Tools for Modelling Manufacturing Information to Support Simultaneous Engineering

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IFAC Proceedings Volumes 1994年第4期27卷 95-101页

作者： A. Molina T.I.A. Ellis R.I.M. Young R. Bell Manufacturing Engineering Department Loughborough University of Technology Loughborough Leicestershire LEU 3TU U.K.

A novel approach to the development of a manufacturing information model, which forms part of a CAE system for simultaneous engineering is presented. The combined use of reference models (CIM-OSA and RM-ODP), an object oriented methodology (Booch), a function modelling method (IDEFO), an information modelling language (EXPRESS). and computer tools is reported. The importance of using reference models for the definition, design implementation of CAE systems is outlined. Modelling methodologies that effectively map the specification of the reference models are described and theeir usage is explained.

关键词： Modelling models object oriented methodology functional analysis information modelling system analysis computer-aided system design standards

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object oriented framework for dynamical systems modeling: implementation in C++

Object oriented framework for dynamical systems modeling: im...

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Annual Symposium on Simulation

作者： D. Calhoun A. Lewandowski Computer Science Corporation Seattle WA USA Wayne State University Detroit MI USA Administ rat ion NOAA National Oceanic and Atmospheric Administration Seattle WA USA

The authors present the design and implementation in Smalltalk and C++ of an object-oriented framework for dynamic, continuous-time systems simulation. The framework allows the user to define hierarchical models of dynamical systems. Using inheritance hierarchy, the user can build specific models from general ones and using the part-whole relationship the user can build models consisting of submodels. A framework for model communication using ports is also provided. Finally, the framework provides an interface to standard ODE solvers, making it possible to use currently existing libraries of such solvers.< >

关键词： object oriented modeling Atmospheric modeling Computational modeling Software tools Marine vehicles Standards development Robustness Discrete event systems Software libraries Software packages

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