Abstract
Typical component-placement systems for populating surface mount technology printed circuit boards now exhibit a high degree of concurrency in their functional operations. This concurrency ideally yields high “burst-rate” estimates of throughput. However, if the concurrency is not properly understood and exploited, the burst rate is severely degraded, as exhibited by process rates observed in the actual production environment. This discernment requires an experimental characterization of the system's functional operation, which must also reflect the peculiarities of the controller. Such an experimental analysis is an essential precursor to performance-optimization procedures of numerically controlled flexible manufacturing systems. This article describes our analysis of an extremely complex workcell with a high degree of concurrency. Due to its enveloping complexity, the methodological framework for the analysis should be applicable to a broad class of concurrent systems. Empirically verifying the characterization required the development of an emulator that quantitatively defines the system to be modeled. As such, it is a numerical, off-line design and analysis tool. It has been utilized to obtain the process rate for particular products, preevaluate proposed engineering changes, interactively construct setups and sequences, and obtain parameters required for line-balancing procedures.
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References
AhmadiJ., GrotzingerS., and JohnsonD., “Component Allocation and Partitioning for a Dual Delivery Placement Machine,” Operations Research: Special Issue of Operations Research in Manufacturing, Vol. 36, pp. 176–191 (1988).
AhmadiJ., and MacNairE., “Constrained Scheduling to Minimize Makespan on Two Parallel Machines with Job Classes and Setup Times,” Research Report RC 13385, IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, NY (1987).
AhmadiJ., and AliA., “Integrated Production Scheduling in Large-Scale Flexible Electronic Parts Manufacturing,” Annals of Operations Research, Vol. 15, pp. 269–287 (1988).
“Dynapert MPS-500 Users Manual,” DYNA/PERT, a Division of Emhart Machinery, England (1984).
FurlaniC.M., “PB85–233849/XAB Hierarchical Control System Emulation User's Manual,” NBSIR-85/3156, National Bureau of Standards, Gaithersburg, MD (1985).
Grotzinger, S., and Sciomachen, A., “A Petri Net Characterization of a High Speed Placement Machine,” Proceedings of the 38th Electronic Components Conference, Los Angeles, California, IEEE Catalog Number: 88CH2600-5, pp. 64–68 (May 9–11, 1988).
GrotzingerS., “Positioning for a Dual Delivery Placement Machine,” Research Report RC 13908, IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, NY (1988).
Kamesam, P., private communication, IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, NY (1987).
Passler, E., Hutchinson, G.K., Rudolph, K., and Stanek, W., “Production System Design: A Directed Graph Approach,” Journal of Manufacturing Systems, Vol. 2, No. 2, p. 44 (1983).
PetersonJ.L., Petri Net Theory and the Modeling of Systems, Prentice-Hall, Inc., Englewood Cliffs, NJ (1981).
WhitehouseG.E., Systems Analysis and Design Using Network Techniques, Prentice-Hall, Inc., Englewood Cliffs, NJ (1973).
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Ahmadi, J., Grotzinger, S. & Johnson, D. Emulating concurrency in a circuit card assembly system. Int J Flex Manuf Syst 3, 45–70 (1991). https://doi.org/10.1007/BF00167525
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DOI: https://doi.org/10.1007/BF00167525