Performance measurement and lumped parameter modeling of single server flow lines subject to blocking: An effective process time approach

Authors:
A. A. A. Kock;F. J. J. Wullems;L. F. P. Etman;I. J. B. F. Adan;F. Nijsse;J. E. Rooda
Affiliations:
Eindhoven University of Technology, Department of Mechanical Engineering, PO Box 513, 5600 MB, Eindhoven, The Netherlands;VDL Steelweld B.V., Reliability and Maintainability Department, PO Box 3339, 4800 DH. Breda, The Netherlands;Eindhoven University of Technology, Department of Mechanical Engineering, PO Box 513, 5600 MB, Eindhoven, The Netherlands;Eindhoven University of Technology, Department of Mathematics and Computer Science, PO Box 513, 5600 MB, Eindhoven, The Netherlands;VDL Steelweld B.V., Reliability and Maintainability Department, PO Box 3339, 4800 DH. Breda, The Netherlands;Eindhoven University of Technology, Department of Mechanical Engineering, PO Box 513, 5600 MB, Eindhoven, The Netherlands
Venue:
Computers and Industrial Engineering
Year:
2008

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Abstract

The present paper extends the so-called effective process time (EPT) approach to single server flow lines with finite buffers and blocking. The power of the EPT-approach is that it quantifies variability in workstation process times without the need to identify each of the contributing disturbances, and that it directly provides an algorithm for the actual computation of EPTs. It is shown that EPT-realizations can be simply obtained from arrival and departure times of lots, by using sample path equations. The measured EPTs can be used for bottleneck analysis and for lumped parameter modeling. Simulation experiments show that for lumped parameter modeling of flow lines with finite buffers, in addition to the mean and variance, offset is also a relevant parameter of the process time distribution. A case from the automotive industry illustrates the approach.