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CyclicScheduling_6x

CyclicScheduling_6x - Visual Representation in MS Excel...

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5/1/2007 Industrial Data and Systems Analysis 1 Cyclic Scheduling Peter L. Jackson School of Operations Research and Information Engineering Cornell University 5/1/2007 Industrial Data and Systems Analysis 2 Visual Representation in MS Excel Each column represents 5 minutes of run duration Color shades indicate precedence: lighter shades must precede darker shades 5/1/2007 Industrial Data and Systems Analysis 3 Completed Schedule 86 columns x 5 min. per column = 430 minutes Makespan = total time required to complete all jobs = 430 minutes 5/1/2007 Industrial Data and Systems Analysis 4 Is Makespan Important? What does makespan tell us? How long it takes to complete a set of jobs If we divide the number of jobs by the makespan, does that tell us the throughput rate of the factory? Only if the factory waits until those jobs are done before starting another set of jobs Silly, almost no factory operates like that So, no. #jobs/makespan does not equal throughput Makespan does not determine throughput Makespan is important but it is not the only measure of interest 5/1/2007 Industrial Data and Systems Analysis 5 Toyota Standard Operation Routine in Cell Cell consists of all machines required to process a part Operator manually loads (L), unloads (U), and inspects (I) a part from each machine Operator walks around cell in cyclic fashion, keeping equipment busy Operator walk cycle determines throughput of cell To increase throughput, either add more operators or more equipment Depends on bottleneck analysis 5/1/2007 Industrial Data and Systems Analysis 6 Black, J.T. 1991. The Design of the Factory With a Future. McGraw-Hill, Inc. ISBN 0-07-005550-5

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5/1/2007 Industrial Data and Systems Analysis 7 Observations Required cycle time came from top-down analysis (seconds per day/required daily quantity Bottleneck operation is “Finish mill outer and inner ID”: 70 sec. Impossible to meet cycle time with just one machine for this operation Second BR machine added to cell Routing modified to visit each BR machine once per cycle (two parts output per cycle) 5/1/2007 Industrial Data and Systems Analysis 8 Cycle Length, Cycle Time, Throughput Operator walk cycle takes 110 sec. Two parts are produced per cycle Cycle time per part is therefore 55 sec.
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CyclicScheduling_6x - Visual Representation in MS Excel...

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