Emerging Technologies and Factory Automation, 1995. ETFA '95, Proceedings., 1995 INRIA/IEEE Symposium on

10-13 Oct. 1995

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  • Proceedings 1995 INRIA/IEEE Symposium on Emerging Technologies and Factory Automation. ETFA'95

    Publication Year: 1995
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    Freely Available from IEEE
  • Work-in-progress optimization of cyclic manufacturing systems with assigned throughputs

    Publication Year: 1995, Page(s):471 - 477 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    This paper shows that it is possible to formalize and to put in a proper form an optimization problem consisting in the optimization of the work-in-progress (WIP) in a manufacturing system, while ensuring a minimum value for the throughput of each product. The decision variables involved in this problem are the lot sizes for the various products and components and the system initial state, as rega... View full abstract»

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  • Fuzzy linguistic modeling and control of manufacturing systems

    Publication Year: 1995, Page(s):455 - 468 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Manufacturing processes are characterized by both discrete and continuous variable dynamics. The design of innovative and effective control strategies for these processes requires the development of new modeling techniques that not only capture the hybrid continuous/discrete dynamic nature of the process, but also address the performance objectives in a systematic way. It is also desirable that th... View full abstract»

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  • An application of neural networks to computer aided welding

    Publication Year: 1995, Page(s):317 - 325 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Within the context of integrated design, we propose a new approach for off-line programming of welding robots by interfacing a CAD modeler (geometric database) and an artificial intelligence system (welding database). The CAD system used to design pieces to be assembled, allows us to automatically generate welding trajectories and extract the assembly features needed to determine welding parameter... View full abstract»

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  • Cost optimization in supply management policies for assembly systems with random component yield times

    Publication Year: 1995, Page(s):445 - 453 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    This paper addresses the problem of cost minimization in multi-product assembly systems where component yield times are subjected to random uncertainties. At the start of each cycle time, two interrelated decisions have to be made: 1) how many products to assemble for each product type; and 2) how many components to order. The total cost associated with these decisions is the sum of the inventory-... View full abstract»

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  • Continuous versus discrete flow of parts in a production dipole. Exact transient analysis

    Publication Year: 1995, Page(s):167 - 173 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    In the dynamical description of production lines, the hydrodynamical framework to describe production flows of parts has been recognized to yield accurate results in numerous actual applications. The ”hydrodynamic approximation” consists in describing the population level in the buffers by a continuous variable. The aim of this paper is to compare analytically the results obtained in a... View full abstract»

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  • Virtual and node routing for optimal control of production rates in a flexible manufacturing facility

    Publication Year: 1995, Page(s):207 - 217 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    A production facility has several machines that are used to perform the transformation operations required by several parts. These parts are used to produce a number of final products. In this work we focus on the optimization of the production process, without considering the assembly operations. Our model therefore can be used whether the products are assembled in the same factory or packaged fo... View full abstract»

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  • Scheduling flexible manufacturing systems based on timed Petri nets and fuzzy dispatching rules

    Publication Year: 1995, Page(s):309 - 315 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    To explicitly formulate concurrent activities shared resources, precedence constraints and routing flexibility in FMS scheduling, we adopt timed (place) Petri nets for problem representation. The bottom-up method is used to synthesize the system, i.e., the system is partitioned into sub-systems according to the job types, sub-models are constructed for each sub-systems, and a complete net model fo... View full abstract»

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  • On the optimization of a single-stage generalized kanban control system in manufacturing

    Publication Year: 1995, Page(s):437 - 444 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    We consider a manufacturing system that uses a pull control mechanism to determine when to release raw parts at its input based on actual customer demands for finished parts at its output. This pull control mechanism depends on two parameters: the number of kanbans, which are cards authorizing the release of raw parts into the system, and the base stock of finished parts. We call this system the s... View full abstract»

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  • Shop floor management using a fuzzy inference controller

    Publication Year: 1995, Page(s):271 - 278 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    In this paper the authors propose a theoretical framework, based on fuzzy logic, to develop a shop floor controller. By recognizing that these weights are strongly influenced by the shop floor conditions, the authors introduce a fuzzy logic algorithm which determines both the jobs priorities and the corresponding weights applying a number of fuzzy rules. Since the rules premises are defined as fuz... View full abstract»

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  • A new approach to study selected functional properties of manufacturing systems based on the concept of orthogonal functional abstractions

    Publication Year: 1995, Page(s):153 - 164 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    In this paper, we introduced a concept of orthogonal functional abstractions. The orthogonal functional abstractions represent selected external functional behaviour of Petri net models. By using orthogonal abstractions which represent one specific aspect of the external behaviour of Petri net models constituting a model of a system, the selected functionality of the whole system can be studied in... View full abstract»

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  • On an expert system with tabu search for multiobjective project scheduling

    Publication Year: 1995, Page(s):87 - 94 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    We present a decision support system for multiobjective project scheduling problems under multiple category resource constraints. It handles quite a general class of nonpreemptive scheduling problems with renewable, nonrenewable and doubly-constrained resources, multiple performing modes of activities, precedence constraints in the form of an activity network and multiple project performance crite... View full abstract»

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  • Performance evaluation of kanban multiple-product production systems

    Publication Year: 1995, Page(s):557 - 566 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Kanban systems provide a way to implement a pull-type control policy. In this paper, we propose an analytical method for approximating the performance of a multiple-product kanban production system. This method uses the queueing network model of the kanban system, which is a closed multiclass queueing network (each class represents one type of kanban). It is based on the product-form approximation... View full abstract»

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  • Microtechnologies for microscaled robots and components

    Publication Year: 1995, Page(s):9 - 20 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1276 KB)

    The key technology for scaling of robots and its components to the millimetre and submillimetre range is micromachining technology which is considered in this paper. Components, such as sensors and actuators fabricated by silicon micromachining are reviewed from the point of view of microscaled robotics. For microrobots there is a demand on microactuators for propulsion with low power requirements... View full abstract»

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  • Integrated model and simulation of the production system

    Publication Year: 1995, Page(s):499 - 507 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Market constraints make it necessary for firms to take a global view and therefore to find a model permitting the integration of different functions of production. This aim is to develop a new approach based on three entities: process, functions, actors (PFA approach). The actors are all the human and material resources of the production system. The process represents all the logical mechanisms of... View full abstract»

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  • Selection of assembly sequences and balancing workloads in a flexible assembly line

    Publication Year: 1995, Page(s):349 - 359 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    An optimal allocation of production resources in a flexible assembly line is considered along with selection of assembly sequences for a mix of product types. The problem objective is to balance station workloads and station-to-station product movements. A two-level approach is proposed in which feasible assembly sequences are generated at the, upper level and optimal sequences along with operatio... View full abstract»

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  • A decomposition approach for performance evaluation of non-pipelined systems

    Publication Year: 1995, Page(s):195 - 203 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Although many schemes have been proposed for representing assembly systems, very few of them appear to be adequate for modelling commercially critical real-time issues such as throughput and performance. In this paper assembly systems are represented using timed Petri nets. We propose a three step approach to analysing the Petri net model for performance. The three steps involved are decomposition... View full abstract»

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  • Fuzzy flexibility analysis in automated manufacturing systems

    Publication Year: 1995, Page(s):299 - 307 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Some researchers propose systematic procedures for quantifying flexibility in monetary terms and use financial evaluation models with decision criteria based on present worth, equivalent uniform annual worth, and the other discounting techniques. Many parameters are defined while quantifying flexibility value and are assumed to be accurate numerical estimates. But it must be considered that some c... View full abstract»

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  • Optimization of a quasistationary catalytic process in a chemical reactor

    Publication Year: 1995, Page(s):43 - 49 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Considers a process in a catalytic reactor where two reactions take place: one leads to forming an objective product B, and another, given a by-product C. The authors propose a relaxative algorithm which does not use optimization with respect to the parameter. There is no need to illustrate efficiency of the algorithm by a concrete example, since it follows from the increment formulas considered f... View full abstract»

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  • Extension of Cayley-Hamilton theorem for arbitrary polynomial matrices

    Publication Year: 1995, Page(s):67 - 74 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    We give an alternative, more convenient, expression of the Cayley-Hamilton theorem when polynomial matrices of arbitrary degree are involved. Based on the results of the algorithm of Fragulis et al. (1991) for the computation of the inverse of a polynomial matrix, certain relationships among the coefficient matrices of the given polynomial matrix are obtained. We also propose two ways of finding t... View full abstract»

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  • A discrete time model of a car assembly system

    Publication Year: 1995, Page(s):537 - 547 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The performance evaluation of assembly lines under stochastic influence (changing model mix and varying processing times) is usually done by time consuming simulation experiments, In this paper a discrete time queueing model is presented that is a basis of an approximate performance analysis of car assembly systems. The model elements are described and approximate calculation methods for the waiti... View full abstract»

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  • Multicriteria problems of optimal control for queueing systems

    Publication Year: 1995, Page(s):393 - 398 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Queueing systems arise in different areas of human activity, especially in managing and controlling of production systems. Queues appear in modern communication systems, by maintenance of complicated equipment, and so on. The main problem here is to choose the optimal rate of servicing: on the one hand, the small rate results in the bad work of the system as a whole, on the other hand, the big rat... View full abstract»

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  • Lot streaming of a single product in two-machine no-wait flowshops

    Publication Year: 1995, Page(s):427 - 436 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    We consider the problem of minimizing makespan in the two-machine no-wait flowshop with a single product requiring lot streaming. A product (or lot) consists of many identical items. Lot streaming (lot sizing) is the process of creating sublets (or transfer batches) to move completed portion of production sublot to downstream machines so that operations can be overlapped. The number of sublets for... View full abstract»

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  • Multi-site planning: non flexible production units and set-up time treatment

    Publication Year: 1995, Page(s):261 - 269 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    In this paper the multi-site planning and control problem is considered. This problem consists in improving coordination of different production units in the field of production planning and control for a multi-site production. A multi-site production takes place when the production facilities of an international company are located in different geographical sites. To solve this problem a centrali... View full abstract»

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  • Deadlock avoidance policy for manufacturing systems

    Publication Year: 1995, Page(s):141 - 152 vol.3
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    This work intends to give a contribution to the general problem of designing feasible schedules of generic manufacturing systems. The specific problem addressed in this paper is to understand the nature of deadlocks for generic manufacturing systems and find some rules that prevent a generic production system from entering a deadlock condition. A deadlock avoidance policy is proposed and discussed View full abstract»

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