7/24/2019 MM - OM - Flow Time Analysis Session 2b

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MM OMSession 2b

Henry Yuliando

Flow Time Analysis

7/24/2019 MM - OM - Flow Time Analysis Session 2b

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IntroductionFor any given process t!e "ow time o#

di$erent "ow units varies substantially%&rocess "ow time is a valuable measure o#

process per#ormance #or #ollowing reasons'(% Flow time a$ects delivery response time%2% S!ort "ow time reduce t!e inventory )by

*ittle+s *aw, and associated cost- move.uic/ly introduce t!e product to t!emar/et- delay production closer to t!e timeo# sale 0 gain valuable mar/et in#ormation

avoid product obsolescence minimi1e t!einventory and result in #ast #eedbac/ andcorrection o# .uality problems%

7/24/2019 MM - OM - Flow Time Analysis Session 2b

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T!e &rocess Flowc!artA process as !aving ve elements namely inputs

outputs "ow unit networ/ o# activities and bu$ersresources allocated to activities and in#ormationstructure are grap!ically can be represented byw!at is called a process fow chart. )e3amplecase o# 4onder S!ed Inc%,

(

5 6

7 8

2 9 :

Sta

rt

;n

dOutpu

tsInputs

&rocess Flowc!art #or 4onder S!ed Inc% a manu#acturer o# storag

7/24/2019 MM - OM - Flow Time Analysis Session 2b

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eturn to t!e 4onder S!ed e3ample it is /nown t!at

t!e average "ow rate is (:%6 s!eds per !our% Onanaly1ing t!e "ow time #or roo#s it is noted t!at t!eaverage number o# roo#s waiting in various bu$ers is8D )G inventory I,% T!ere#ore t!e average amount o#waiting #or a typical roo# is

T = I/R = 80/16.5 = 291 minute

Adding to t!is gure i# it is /nown t!at t!e total timere.uired to complete a roo# is 8D minutes )theoreticalow time, it is obtained t!at t!e average "ow time #ora roo# is 2( 8D G57( minutes%

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