Emerging Technologies and Factory Automation, 1999. Proceedings. ETFA '99. 1999 7th IEEE International Conference on

18-21 Oct. 1999

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  • 1999 7/sup th/ IEEE International Conference on Emerging Technologies and Factory Automation [front matter]

    Publication Year: 1999, Page(s):i - xviii
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  • Modeling, simulation and perturbation analysis of continuous flow models

    Publication Year: 1999, Page(s):1529 - 1530 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (115 KB)

    Summary form only given. A generic approach to modeling, simulation and sensitivity analysis of continuous flow processes is described. Based on a single-server device, it can serve as a building block in various network configurations, and its application can result in fast simulation and unbiased sensitivity analysis estimators. View full abstract»

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  • Author's index

    Publication Year: 1999, Page(s):1567 - 1573
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  • Optimizing costs and processing times under variable external processing constraints

    Publication Year: 1999, Page(s):1107 - 1115 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    A technique is presented for analyzing complex production systems incorporating task durations, cost, and the impact of external factors. Processes are modeled as a network of dependent tasks, in which the processing time for each task varies based upon external conditions such as product quality, weather, work stoppages, etc. Analysis and optimization techniques are provided to give greater accur... View full abstract»

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  • Shrinkage predictions of injection moulded parts in semi-crystalline polymers: experimental verification

    Publication Year: 1999, Page(s):1281 - 1287 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The aim of this work is to explore the concordance between the shrinkage of injection moulded parts and its simulation from a commercial CAE system (C-Mold from AC Technology). An isotactic polypropylene was injected in a normalized mould following a standard test method for measuring part shrinkage. The influence of geometrical factors (like part thickness, length, longitudinal and normal flow or... View full abstract»

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  • A study on association among dispatching rules in manufacturing scheduling problems

    Publication Year: 1999, Page(s):1355 - 1360 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    There are many scheduling strategies, called dispatching rules, for manufacturing systems. However, those rules can be applied mainly to simple manufacturing systems. We propose a way to evaluate the effectiveness of such dispatching rules in the environment of complex manufacturing systems in the sense that there exist two performance measures. Defining a new concept of closeness of dispatching r... View full abstract»

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  • Applications of discrete-event state equations to manufacturing systems

    Publication Year: 1999, Page(s):1519 - 1528 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (900 KB)

    The paper addresses the problem of modelling and controlling manufacturing systems within the framework offered by the Manufacturing Algebra (MA). The method is outlined through a case study, including production micro- and macro-irregularities. The design of a hierarchical real time controller capable of satisfying the demand of finished products arising from an unpredictable factory planner is a... View full abstract»

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  • Deadlock avoidance policies applied to flexible manufacturing systems modelled by colored Petri nets

    Publication Year: 1999, Page(s):1099 - 1106 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The high degree of resource sharing in flexible manufacturing systems can lead to deadlock situations. We model the concurrent execution of working processes through colored Petri nets and we implement some effective deadlock avoidance policies in the same framework. Control places impose restrictions on the transition firing on the basis of the current marking and a look-ahead procedure of only o... View full abstract»

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  • The Grafcet's macro-action concept: an implementation view

    Publication Year: 1999, Page(s):1275 - 1279 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Some implementation aspects of the Grafcet macro-action concept are presented. Firstly, two different interpretation algorithms are discussed, each of them observing the evolution rules specified by the Grafcet standard, but leading to different results. After that, an algorithm developed to validate the coherence of the macro-actions of the global Grafcet is presented. Finally, some details regar... View full abstract»

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  • Large-scale crew scheduling method by switching allocation knowledge

    Publication Year: 1999, Page(s):1347 - 1353 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    In railway crew scheduling, it is a problem to generate a schedule of crew according to the train timetable, satisfying constraints such as working hours, recess hours, etc. Our research group has proposed a scheduling method which contains two phases: an initial scheduling phase using the state selection method and a modification phase using the relaxation search method. Though this method has be... View full abstract»

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  • Mobile monitoring system using an agent-oriented approach

    Publication Year: 1999, Page(s):1511 - 1515 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The paper describes the work done in the construction of a vision based monitoring station, devoted to control an indoor industrial transport system composed of mobile robots. To construct this application, the essential needs of a generic surveillance system has been analysed. Using an agent oriented approach, a multi agent platform has been established, where different algorithms and strategies ... View full abstract»

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  • Modelling hybrid systems using statecharts and Modelica

    Publication Year: 1999, Page(s):1063 - 1069 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Evaluates the possibility of using the formalism of statecharts, with hybrid features, as a graphical support to describe the dynamic behaviour of complex systems in Modelica. Implementation issues, according to the statecharts semantics, are discussed and the advantages of using an equation based language, to implement the state transitions and nested states, are pointed out. Two levels of statec... View full abstract»

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  • A Petri nets based object oriented tool for the scheduling of stochastic flexible manufacturing systems

    Publication Year: 1999, Page(s):1091 - 1098 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    Flexible manufacturing systems (FMS) have been taking a prominent place in production markets, but constant changes in production rates and product types force us to sort out constantly the scheduling problem that use to be NP-hard. Most commercial tools used to optimize FMS resources are analytical, and often limited to describing stationary relationships between FMS units. An object oriented sim... View full abstract»

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  • SICODI: a configurable real-time distributed control system

    Publication Year: 1999, Page(s):1265 - 1274 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (956 KB)

    Distributed control systems (DCS) have been, in the last years, the focus of some proposed and de facto standardizations. The paper describes the configuration aspects of continuous and discrete event control in a DCS implementation called SICODI, and the degree of integration between them. The communication properties when SICODI takes part in a training simulator are presented, and the communica... View full abstract»

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  • Programmable logic design for an encoder-based velocity sensor in a DSP-controlled motion system

    Publication Year: 1999, Page(s):1243 - 1247 vol.2
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The paper presents a dedicated hardware interfacing an optical incremental encoder and DSP-controlled motion system. Different velocity sensing techniques and methods are discussed. One of them is chosen and implemented, fulfilling the main objectives proposed. The first objective is to reserve the computational power of the DSP for control tasks, avoiding the processor's use for sensing tasks lik... View full abstract»

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  • Using genetic algorithm for job-shop scheduling problems with reentrant product flows

    Publication Year: 1999, Page(s):1339 - 1346 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    We describe a job-shop scheduling method using a genetic algorithm for a production system with reentrant product flows. Fundamentally, the scheduling problem is a sequencing problem of operating order for lots on each process or machine. The difficulty in job-shop scheduling problems with reentrant product flows are these two points. The first point is that there are a large number of processes i... View full abstract»

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  • Implementation of ladder diagram for programmable controller using FPGA

    Publication Year: 1999, Page(s):1381 - 1385 vol.2
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    Sequential control is an elementary technology for manufacturing systems. Manufacturing devices or systems are usually controlled by programmable controllers (PCs). In order to satisfy the requirements of downsizing and hidden information, we develop a novel type of controller which is implemented using the field programmable gate array (FPGA) as an application specific integrated circuit (ASIC). ... View full abstract»

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  • Adding reactivity to path following by an autonomous robot

    Publication Year: 1999, Page(s):1501 - 1510 vol.2
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    The paper describes a behaviour-based approach that controls an autonomous robot for following given paths. When following a given path, it can be the case that the robot finds an unexpected obstacle obstructing its trajectory. We present a control strategy that solves this situation by adding reactivity to the wall following process View full abstract»

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  • Improving manufacturing co-operation in a virtual enterprise by tracker mobile agents

    Publication Year: 1999, Page(s):1451 - 1458 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Agents are a new paradigm in software development. However, this paradigm offers new methodologies only in certain areas. Our view is that IT integration of a virtual enterprise is one of the most promising fields for agent-based software. In this paper, we present an approach based on tracker mobile agents, which is intended to support the decision-making process for changes during product manufa... View full abstract»

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  • General predictor in the algebra of dioids

    Publication Year: 1999, Page(s):1057 - 1062 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Discrete event systems undergo perturbations that disrupt the control system and reduce the capacities of anticipation of the future evolution of the process. In the (max, +) algebra, processes modelled by a timed event graph may be represented by a linear model. The knowledge of the model and of the initial conditions enable us to characterise the state vector with a state equation iteration but ... View full abstract»

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  • High-performance of geometric primitives detection usinig genetic algorithm

    Publication Year: 1999, Page(s):931 - 940 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    In this paper, we present some new methods for high performance of geometric primitives detection using a genetic algorithm (GA). At first, we describe the detection algorithm based on minimal subset and improvement of fitness function of geometric primitives. Secondly, we analyze the structure of minimal subsets and its probability properties in a digital image, and we improved the probability of... View full abstract»

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  • Generation of Boolean logic equations for discrete logic control

    Publication Year: 1999, Page(s):1541 - 1545 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A systematic procedure is presented for generating Boolean logic equations that represent the desired control action to be carried out by a discrete logic controller. A key component of the controller design is the specification of set and reset operations that define the next value of each state variable in the Boolean logic equations for the controller. The logic equations can be implemented on ... View full abstract»

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  • Modular fault diagnosis based on discrete event systems for a mixer chemical process

    Publication Year: 1999, Page(s):1123 - 1130 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The knowledge of failure type and their location is an indispensable requirement for the establishment of tasks of adequate recovery strategies and maintenance of both factory automation and process control systems. The failure diagnosis methodology presented in the paper is based on discrete event systems models and on the diagnosers concept, those which permit the analysis off-line and online of... View full abstract»

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  • Predicates and predicate transformers for the supervisory control of timed discrete event system

    Publication Year: 1999, Page(s):1081 - 1090 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    We approach the problem of controlling the behavior of a given real time discrete event system (RTDES) described in terms of its state trajectories by using predicates and predicate transformers. The timed supervisory predicate control problem (TSPCP) is introduced as the problem of synthesizing a supervisor for a given RTDES. So that, the set of legal predicates corresponds to the weakest predica... View full abstract»

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  • Design of real time software for industrial process control

    Publication Year: 1999, Page(s):1259 - 1263 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The paper describes the details of, and the experiences gained from, a case study undertaken by the authors on the design and implementation of a complex control system for a dosage industrial process used in a manufacturing industry. The goal was to demonstrate that industrial real time control systems could be implemented using a high level programming language and some suitable operating system... View full abstract»

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