2.4 Advanced Process Flow Variability

2.4 Advanced Process Flow Variability - Click to edit...

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Unformatted text preview: Click to edit Master subtitle style 7/7/11 BUSINESS PROCESS ANALYSIS PROCESS CAPACITY ANALYSIS Variability in Line Processes 11 M GSC 485 – Business Pr ocess M anagement M oor e School of Business Univer sity of South Car olina 7/7/11 22 Variability is any departure from uniformity and may be random or controllable Sources of variability include : setups • work pace variation failures • differential skill levels shortages • engineering change orders yield loss/rework • customer orders operator unavailability • product differentiation Flow Line Variability 7/7/11 33 Measuring Process Variability CV , variation of t coefficien time process of deviation standard rate processing mean 1 r job a of time process mean p = = = = = = p p p p p p t c σ t t σ 7/7/11 44 Process Variability – Trial Machine 1 Machine 2 Machine 3 1 22 5 5 2 25 6 6 3 23 5 5 4 26 35 35 5 24 7 7 6 28 45 45 7 21 6 6 8 30 6 6 9 24 5 5 10 28 4 4 11 27 7 7 12 25 50 500 13 24 6 6 14 23 6 6 15 22 5 5 t p 25.1 13.2 43.2 s p 2.5 15.9 127.0 c p 0.1 1.2 2.9 c p 2 0.01 1.4 8.6 Class LV MV HV 7/7/11 55 Illustrating Flow Variability t Low var iability ar r ivals t H igh var iability ar r ivals Measuring Flow Variability t mea n time bet we en arri val s r arriva l rate std dev of time bet we en arri val s c t coe f of iation of erar riva l times a a a a a a = = = = = σ σ var int 7/7/11 66 Propagation of Single Machine Station: where u is the station utilization given by...
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This note was uploaded on 07/02/2011 for the course MGSC 485 taught by Professor Ahire during the Spring '10 term at South Carolina.

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2.4 Advanced Process Flow Variability - Click to edit...

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