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CompEuro '93. 'Computers in Design, Manufacturing, and Production', Proceedings.

Date 24-27 May 1993

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Displaying Results 1 - 25 of 69
  • Proceedings of COMPEURO '93

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    Freely Available from IEEE
  • An advanced planning and control system for discrete manufacturing

    Page(s): 139 - 145
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    The main results achieved in the ESPRIT project IMPACS (Integrated Manufacturing Planning And Control System) are presented. IMPACS covers the complete hierarchy of production planning and control. It requires integrated solutions and decision making. The premise of IMPACS is that no amount of sophisticated tools and techniques to automate and computerize production planning and control are really useful unless they are developed within an architecture context. This architecture is associated with a methodology which shows how to use the architecture to implement the IMPACS in a particular enterprise, taking into account its specific requirements. A computer tool set called CAGIM (Computer Aided General IMPACS method) is developed to support the use of the architecture and methodology. An overview of the IMPACS project, IMPACS architecture and methodology, as well as the CAGIM tool is given View full abstract»

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  • Outline for discrete part manufacturing engineering

    Page(s): 146 - 155
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    It is argued that within the framework of computer integrated manufacturing and engineering reference modeling, manufacturing system models may be and must be verified by prototyping supported by computer-aided methodology rather than by paper-aided methodology. Both synchronic and diachronic life-cycles as employed in integration engineering are described View full abstract»

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  • Electronic data interchange (EDI)-definition-justification-implementation

    Page(s): 358 - 364
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    A general discussion of electronic data interchange (EDI) is presented. EDI is defined, and its domain is indicated. Economic issues specific to EDI are discussed. An approach for project management and implementation is suggested. The possible future effects of EDI on business are given View full abstract»

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  • Implantation oriented methodology in design control of flexible manufacturing systems

    Page(s): 125 - 131
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    A computer-aided design methodology for flexible manufacturing system control with a view to industrial implementation is presented. In the modeling phase, based on the Petri net formalism, generic aspects which allow the use of an object-oriented approach are discussed. The CASPAIM II (Conception Assistee de Systemes de Production Automatises en Industrie Manufacturiere) project methodology employs a product approach and integrates the planning, the scheduling, and the treatment of failures View full abstract»

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  • TRACK II: A multi-processor robot controller

    Page(s): 86 - 93
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    Advanced robotic systems require a multiprocessor architecture, a real-time operating system and appropriate interfaces. The asynchronous nature of these systems causes non-deterministic behavior and poor reliability. The specification and design of a high-performance controller for advanced manipulation systems is presented. The controller has a modular parallel architecture which can be extended without performance degradation, a synchronous real-time operating system and a kit of hardware modules. The authors' design philosophy aims for maximum real-time computing power by exploiting the computational characteristics of robot control and planning algorithms, together with minimum software development effort, at the expense of CPU utilization View full abstract»

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  • Distributed intelligent actuators and sensors

    Page(s): 79 - 85
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    Distributed intelligent actuators and sensors (DIASs) are discussed. The DIAS project is the first stage towards realization of integrated automation within a control, maintenance and technical management system (CMMS). The concept of control islands, maintenance islands, and technical management islands is discussed. DIAS subsystems, methodology and demonstration sites are described View full abstract»

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  • Data access protocols for integrated engineering environments

    Page(s): 350 - 357
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    Open access to distributed information stores is a problem in integrated engineering environments. Data access protocols provide a common interface for the access to information stores. Several file transfer and database access protocols are standardized in the context of the ISO open system interconnection reference model. The Document Filing and Retrieval Protocol Standard (DFR) is compared with alternative solutions such as FTAM (File Transfer Access and Management) or RDA (Remote Database Access). Evaluation criteria are introduced, and the suitability of the protocols for the use within integrated engineering environments is discussed View full abstract»

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  • After CAD: Automatic design: dream or reality?

    Page(s): 156 - 169
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    In mechanical design, current CAD systems can only perform two kinds of tasks: calculation of the performance of already designed elements, and final drafting of assembly and detail drawings prior to manufacturing and filing. The creative tasks remain the exclusive domain of man. A new concept, called synthetic intelligence, seems to be able to do creative tasks. An example is given. The first commercially available truly generative process planner (KRONOS) does perform such work. KRONOS, composed of a part editor, a technological preprocessor, a logic module, and a technological module, is described View full abstract»

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  • A conceptual data scheme for integrated maintenance: A map to design maintainable AMS

    Page(s): 112 - 118
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    The maintenance of large automated manufacturing systems (AMSs) requires the integration of various maintenance tools. Results of a research project concerning data exchanges between design tools and maintenance tools (GAMA project: Genie Automatique pour la Maintenance) are presented. A complete prenormative conceptual data schema for integrated maintenance of AMSs is developed View full abstract»

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  • Architecture of the control system of a mobile robot based on the use of a real-time multitasking executive with an expert system

    Page(s): 182 - 192
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    A hierarchical control system of an autonomous mobile robot which has to travel in a quasi-static environment is studied and implemented. The architecture of the control system involves three levels: planner, navigator, and pilot. From a cartography of the environment, the planner elaborates all the possible paths to reach a goal from a starting point. The algorithm used is based on the traversability concept. The planner level does not operate in real time. With the information given by the planner, the navigator defines a constrained optimal trajectory. The navigator is able to avoid an unexpected obstacle on the defined trajectory and the navigator works under real-time constraints and a multitasking mode. The pilot manages the sensors (odometry, telemetry) and the feedback control of the robot actuators. These tasks are decoupled from those executed by the main processor. The three hierarchical levels are designed with a real-time multitasking operating system associated with an expert system View full abstract»

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  • Architecture of an MMS event manager

    Page(s): 439 - 444
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    Event management is often considered as the most complex functional unit of the Manufacturing Message Specification (MMS). A model for an MMS event manager, i.e., the entity within the virtual manufacturing device (VMD) that is responsible for the management of MMS events, is presented View full abstract»

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  • Structured documentation systems for aircraft engine manufacturing

    Page(s): 518 - 522
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    The implementation of technical documentation systems in SNECMA production facilities is described. The needs are explained. The functionalities are detailed, together with the structure of the documents. A solution is given in terms of hardware and software, with examples from operational systems. The benefits of such projects are indicated View full abstract»

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  • Synchronous programming: introduction and application to industrial process control

    Page(s): 461 - 470
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    Synchronous languages and their potential applications to industrial process control are discussed. The synchronous approach to real time system programming is described. Ongoing research on synchronous programming in industrial process control applications is reported View full abstract»

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  • Object data base. AI and CAD-CAM: application to the process ascending generation (PAG) concept

    Page(s): 320 - 329
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    An approach called process ascending generation (PAG) to generate sequences of operations for a given machining feature is presented. The PAG determines the sequences of operations for a given feature, starting from its finished state and, by successive steps, leading up to its raw state. The object modeling problem is solved for some machining features and for an object database called Cutting Tool Chart (CTC). The CTC is a new concept used to model the abilities of the cutting tools to perform a machining feature. A forward-chaining rule-based strategy is used to implement the PAG concept in Prolog language. All of those aspects are implemented on CAD-CAM software, which is constituted by an object oriented database (OODB) and an integrated AI language View full abstract»

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  • CALS: An essential strategy for paperless interchange of technical information for manufacturing-current and future standards

    Page(s): 73 - 78
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    Computer-aided acquisition and logistics support (CALS) is a Department of Defense and industry initiative, consisting of strategies, technologies, concepts and standards to reduce time-to-market, reduce costs and improve the quality of multiple-contractor projects (initially weapons systems). The evolution of CALS is summarized from paper flow to integrated and digital technical information, shared by government and contractors. Current and future CALS standards are presented View full abstract»

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  • APRIS: Automatic Pattern Recognition and Inspection System

    Page(s): 23 - 28
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    A fast visual automatic pattern recognition and inspection system is described. The major aim of the system is the recognition and inspection of 2D patterns and images in the printing industries. The strategy behind the system uses a hybrid structure combining the conventional n-tuple method and the pixel-by-pixel comparison method. Both of these methods lend themselves to a massively parallel hardware implementation using application specific integrated circuits (ASICs). High-density field programmable gate arrays (FPGAs) were chosen for the implementation of the system, providing the high speeds required by the automatic recognition and inspection of modern automated assembly lines View full abstract»

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  • A new decentralized approach for FMS control

    Page(s): 410 - 416
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    An approach for integrated flexible manufacturing system (FMS) control is developed. Decentralized control is examined and shown to compare favorably with conventional centralized control. It complies with the requirements of flexibility, reactivity, and accessibility for use on FMSs. The principles of a coordination founded on an event-based approach are given. A presentation model and its implementation principles are presented View full abstract»

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  • Performance engineering throughout the product life cycle

    Page(s): 344 - 349
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    A methodology for integrating performance engineering into the software development cycle is described. This approach is being tested by a number of products as part of the development of new performance engineering procedures. Early results show a dramatic performance improvements when performance engineering is started early in the product lifetime View full abstract»

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  • Feature recognition from 2D and 3D modellers

    Page(s): 210 - 216
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    It is established that feature recognition is the area which needs concentration for a totally automated process planning system (APPS) and the cornerstone for developing downstream application programs to a higher degree. In that context, important feature aspects and the philosophy behind feature based systems are presented. Well-known works and recognition techniques developed in the three-dimensional domain are surveyed. The 2-D context is also examined View full abstract»

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  • Effective implementation of SPC in wide area manufacturing systems (A case study)

    Page(s): 132 - 138
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    Statistical process control (SPC) is a tool for monitoring the manufacturing process. To be effective, SPC must be coupled with a system for solving problems. The use of computer systems and a special organizational structure to achieve an effective SPC implementation are discussed. The facility is considered to be a wide area manufacturing system (WAMS) because various manufacturing support groups are located in different buildings around the manufacturing facility View full abstract»

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  • The Fieldbus, a worldwide challenge FIP, second generation technology

    Page(s): 446 - 451
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    The Fieldbus is intended to connect in an open way a number of field devices of various origins, providing industrial control and various other functionalities at low cost. Several approaches have been set: minimalist, specialist, and global. In the standardization domain, various organizations act in this field. IEC, ISA, CENELEC, DKE, and UTE are the international bodies concerned with this activity. The first generation of FIP components from CEGELEC is available on the market, including FULLFIP, FIPLD1 and FIPTR1. The second generation provides industrial and highly competitive FIP components in addition to meeting IEC physical layer compatibility View full abstract»

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  • Robot programming system for research purposes

    Page(s): 94 - 101
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    The hardware and software structure of the ASEA IRp-6 robot control system is presented. It has been developed to make both the hardware and software architecture open for research and teaching purposes. The user can communicate with the robot controller through a direct access interface between the host computer and the controller itself. The main part of the software is a library of subroutines of a modular and open architecture. Several experiments are carried out on the system and show that it can be programmed in a flexible way View full abstract»

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  • Factory-level supervision based on real-time cellular object architectures

    Page(s): 430 - 438
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    An architecture for the supervisory control of flexible production processes at the factory level is introduced. The architecture is based on the idea of concurrent synchronous cellular logic and its extensions in the form of multi-level hierarchical structures. Active cellular objects are used to provide real-time behavioral templates which can be instantiated at any time by translating the formal process specifications given in the form of a colored Petri net. The resulting architecture exhibits high-performance characteristics through its parallel organization and very high flexibility through its modular template-like structure View full abstract»

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  • Realisation with constraint programming of leveled and sequenced schedule for discontinuous process systems

    Page(s): 507 - 517
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    Studies on models and tools for production control of discontinuous process systems have been made by the laboratory `Genie Industriel et Logiciel' of the University of Valenciennes and the `Institute Productique' of the Sligos Company. They have led to the development of a model of leveled scheduling and of sequenced scheduling for batch production systems. Experiments on the prototype model indicate its validity View full abstract»

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