Week5_FlowVariability_Factory Physics Ch8 (2).pptx

Week5_FlowVariability_Factory Physics Ch8 (2).pptx - Flow...

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Flow Variability
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Flow Variability Process Variability is bad enough… It inflates station WIP It inflates station CT It causes lower utilization of capacity But, process variability also propagates… Uneven arrivals to other stations downstream Inflated WIP and CT at other stations It causes lower utilization of capacity throughout the line
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Illustrating Flow Variability t Low variability arrivals t High variability arrivals smooth! bursty!
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Measuring Flow Variability times al interarriv of variation of t coefficien squared rate arrival 1 arrivals between mean time 2 a a a a c t r t
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Propagation of Variability – High Utilization Station (Close to 100%) HV LV HV HV HV HV LV LV LV LV LV HV Conclusion : flow variability out of a high utilization station is determined primarily by process variability at that station.
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Propagation of Variability – Low Utilization Station (Close to 0%)
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  • Spring '14
  • AURIEMMA,MICHAEL
  • Weighted mean, Weight function, Capacity utilization, The Station nightclub fire, Stations of the Cross

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