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  • Articles  (7)
  • Flexible manufacturing systems  (7)
  • 1985-1989  (7)
  • 1980-1984
  • 1970-1974
  • 1950-1954
  • 1945-1949
  • Economics  (7)
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  • Articles  (7)
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  • 1985-1989  (7)
  • 1980-1984
  • 1970-1974
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    An efficient method to determine the optimal configuration of a flexible manufacturing system (1988)
    Springer
    Annals of operations research 15 (1988), S. 207-225 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; optimal configuration ; queueing network models ; product-form queueing networks ; lower configuration ; heuristic solution ; optimal solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract A frequently encountered design issue for a flexible manufacturing system (FMS) is to find the lowest cost configuration, i.e. the number of resources of each type (machines, pallets, ...), which achieves a given production rate. In this paper, an efficient method to determine this optimal configuration is presented. The FMS is modelled as a closed queueing network. The proposed procedure first derives a heuristic solution and then the optimal solution. The computational complexity for finding the optimal solution is very reasonable even for large systems, except in some extreme cases. Moreover, the heuristic solution can always be determined and is very close (and often equal) to the optimal solution. A comparison with the previous method of Vinod and Solberg shows that our method performs very well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186797
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  • 2
    Electronic Resource
    Electronic Resource
    Rigid and flexible automation for manufacturing systems: Characterizing economically-reasonable investments (1988)
    Springer
    Annals of operations research 15 (1988), S. 21-35 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; transfer lines ; stationary demand ; economic assessment ; mathematical programming ; Kuhn — Tucker conditions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract As flexible manufacturing technology has become available across a broad range of applications, an increasingly large number of firms have confronted decisions about the adoption of flexible automation versus transfer lines versus some combination of these technologies. While the work of previous authors has provided some guidance to such decision making, the modular character of flexible capacity and the indivisible character of a transfer line have not been the basis, previously, for the development of formal decision rules. This paper makes use of a mixed-integer mathematical programming model to generate formal decision rules which, in turn, become an instrument for analyzing several fundamental hypotheses about the introduction of flexible and/or dedicated automation. The firm is assumed to have the objective of maximizing its present value and must account for the interaction of its markets with technological opportunities, present and anticipated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186789
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental investigation of real-time scheduling in flexible manufacturing systems (1985)
    Springer
    Annals of operations research 3 (1985), S. 355-377 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; scheduling ; manufacturing systems ; simulation ; computer integrated manufacturing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper presents a new two-phase (TP) approximate method for real-time scheduling in a flexible manufacturing system (FMS). This method combines a reduced enumeration schedule generation algorithm with a 0–1 optimization algorithm. In order to make the combined algorithm practicable, heuristic rules are introduced for the selection of jobs to be scheduled. The relative performance of the TP method vis-a-vis conventional heuristic dispatching rules such as SPT, LPT, FCFS, MWKR, and LWKR is investigated using combined process-interaction/discrete-event simulation models. An efficient experimental procedure is designed and implemented using these models, and the statistical analysis of the results is presented. For the particular case investigated, the conclusions are very encouraging. In terms of mean flow time, the TP method performs significantly better than any other tested heuristic dispatching rules. Also, the experimental results show that using global information significantly improves the FMS performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023749
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  • 4
    Electronic Resource
    Electronic Resource
    An overview of evaluative models for flexible manufacturing systems (1985)
    Springer
    Annals of operations research 3 (1985), S. 13-21 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; queueing models ; simulation ; performance evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Flexible manufacturing systems (FMSs) are a class of automated systems which can be used to improve productivity in discrete parts manufacturing. Due to the complexity of these systems, it is useful to have models that can aid in the design and operation of FMSs. We specifically differentiate here betweengenerative (or prescriptive) models, whichfind candidate decisions, andevaluative (or descriptive) models, whichevaluate a given set of decisions. We briefly cover, in a practical context, the pros and cons of these two classes of models. Then we focus on the latter class of models. Evaluative models for FMSs fall into five main classes, based on the technique used, namely: static allocation, queueing network theory, simulation, perturbation analysis, and Petri nets. Each of these approaches is briefly described, advantages and disadvantages mentioned, and references given to more detailed papers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023766
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  • 5
    Electronic Resource
    Electronic Resource
    A large scale machine loading problem in flexible assembly (1985)
    Springer
    Annals of operations research 3 (1985), S. 317-332 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; integer programming heuristics ; multiple criteria programming ; material flow systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract Flexible manufacturing is characterized by versatile work stations with minimum change over times and a versatile material handling system. The loading problem in flexible manufacturing is to assign tools, material, operations and jobs to work stations in order to minimize the total number of job-to-work station assignments. In this paper, we describe a special case of the general loading problem applied to flexible assembly and develop a discrete optimization model. We then discuss approaches for obtaining good heuristic solutions and present results for a large scale study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023747
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  • 6
    Electronic Resource
    Electronic Resource
    A technique for on-line sensitivity analysis of flexible manufacturing systems (1985)
    Springer
    Annals of operations research 3 (1985), S. 379-391 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; discrete event systems ; real-time systems ; monitoring ; simulation ; performance evaluation ; perturbation analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The recent perturbation analysis approach to discrete event systems is applied to flexible manufacturing systems (FMS). While analytic (queueing) models are useful in preliminary design of such systems, they are not accurate enough at the detailed design/operation stage. Thus, experimentation on detailed simulations or on the actual system has been the way to optimize system performance. Perturbation analysis allows us to derive the sensitivity of system performance, with respect to several design/operating parameters, by observing a single experiment (and without having to actually alter the parameters — often a costly operation). Thus, observation of one experiment can give accurate directions for the improvement of several parameter values. Here we give a simulation example illustrating how perturbation analysis could be used on-line on an FMS to improve its performance, including reducing its operating cost. Experimental results are also presented validating the estimates obtained from this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023776
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  • 7
    Electronic Resource
    Electronic Resource
    A Petri net approach to the modelling and analysis of flexible manufacturing systems (1985)
    Springer
    Annals of operations research 3 (1985), S. 449-472 
    Details
    ISSN: 1572-9338
    Keywords: Flexible manufacturing systems ; concurrency ; Petri net modelling ; union of Petri nets ; place invariants ; deadlocks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this paper we present an approach for modelling and analyzing flexible manufacturing systems (FMSs) using Petri nets. In this approach, we first build a Petri net model (PNM) of the given FMS in a bottom-up fashion and then analyze important qualitative aspects of FMS behaviour such as existence/absence of deadlocks and buffer overflows. The basis for our approach is a theorem we state and prove for computing the invariants of the union of a finite number of Petri nets when the invariants of the individual nets are known. We illustrate our approach using two typical manufacturing systems: an automated transfer line and a simple FMS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023780
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