Scheduling of FMSs with information delays: A simulation study |
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Authors: | Rahul Caprihan and Subhash Wadhwa |
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Affiliation: | (1) Department of Mechanical Engineering, Dayalbagh Educational Institute, Dayalbagh, Agra, India, 282 005;(2) Department of Mechanical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, India, 110 016 |
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Abstract: | Practitioners and academicians throughout the world recognize the crucial role played by flexibility within manufacturing
organizations, especially those engaged in small batch manufacture. However, although the concept of flexibility has begun
to attract increased attention, its interaction with information integration and automation has not captured due attention.
For example, it almost always has been assumed that a real-time control mechanism is available for exploiting routing flexibility
on the shop floor. While this may be true for FMSs, it generally is not so for the vast majority of conventional manufacturing
systems with varying levels of information integration and automation. The lack of a fully integrated and automated control
mechanism within such semi-automated flexible manufacturing systems (SAFMSs) would eventually cause delays in the availability of shop status information. In this paper, we study the impact
that defined modes of information delay have on the performance of a hypothetical SAFMS through detailed simulation experiments.
Given that the level of routing flexibility is a controllable design parameter, our interest is in determining the impact
that information delays have on decisions pertaining to the selection of appropriate levels of routing flexibility. To highlight
the impact of information delays within the SAFMS, the Taguchi experimental design procedure is adopted as a performance evaluation
and analysis vehicle, using makespan as a measure of performance. Simulation results indicate the presence of a system specific tolerance limit, operation below
which minimizes performance loss. |
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Keywords: | Information delays Routing flexibility Dynamic sequencing and dispatching Simulation Taguchi experimental design |
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