4QA3 F12 Week 11 Lecture Notes

The actual cycle time is the maximum workload assigned

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Unformatted text preview: task i: task i time plus time for all activities that have i as a predecessor. 2.  Rank the jobs in descending order of the positional weights. 3.  Consider workstation 1 as the current workstation. 4.  Assign the task with the highest positional weight to the current station given that: Precedence relationship is satis5ied, o  The time at the current workstation (with the new task added) will not exceed the desired cycle time. o  5.  If none of the tasks meet the above conditions, designate a new station. 6.  Repeat step 4 until all tasks have been assigned to workstations 4QA3 F12 A. Gandomi 36 Task Immediate Predecessors PW — A B B A C, D F E G, H Performance Time 66 33 18 17 26 13 10 14 3 A 10 B 11 C 5 D 4 E 12 F 3 G 7 H 11 I 3 Total time 66 Desired Cycle: 480/40 = 12 min/station 5 10 11 A B 12 4QA3 F12 480 available mins per day 40  units required E C 4 D 3 7 F G 3 11 H A. Gandomi I 37 Task Time PW A 10 11 12 5 4 11 3 7 3 66 33 26 18 17 14 13 10 3 B E C D H F G I Desired Cycle: 12 min/station Station 1: A Station 2: B Station 3: E Station 4: C Station 4: C, D, F Station 4: C, D Station 5: H 5 10 11 A B 12 E 4QA3 F12 C 4 D 3 F Station 6: G Station 6: G, I 7 G 3 11 I H A. Gandomi 38 ●  Course textbook o  Chapter 8: 8.1–8.7; 8.10. ●  Suggested problems o  Chapter 8: 4, 6, 13, 27. ●  Further Readings o  Jay Heizer & Barry Render, Operations Management (Prentice Hall): Chapter 15. o  William Stevenson, Operations Management (McGraw- Hill): Chapter 5. ●  Next lecture readings: Chapter 6: 6.1–6.4; 6.6- 6.10. 4QA3 F12 A. Gandomi 39...
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