12+Lot_Streaming

# 12 Lot_Streaming - LotStreaming LotStreaming LotStreaming LotStreaming Objective Objective BasicDecisions Numbe

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Lot Streaming Lot Streaming

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Lot Streaming Lot Streaming Lot streaming  is a term used to describe  the splitting of a job or lot into sublots or  transfer batches so that simultaneous  processing of the sublots on different  machines can be achieved.
Objective Objective Basic Decisions:  Number of sublots  Size of each sublot The objective  is minimizing the makespan, i.e., the  time the last sublot leaves the last machine. It is  assumed that a lot goes through a series of m  machines. In order to reduce the makespan, lot  splitting is considered. Once the last sublot completes  its operation on machine m, the lot is then reconfigured  and sent to another place as a complete lot.

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Figure without Lot Splitting Figure without Lot Splitting Operation 1 Operation 2 Operation 3 10 20 30 time No splitting (process batch=transfer batch =  10) Makespan = 30 min.
Figure with Lot Splitting Figure with Lot Splitting Operation 1 Operation 2 Operation 3 10 20 30 time Two equal size sublots (process batch =10, transfer  batch = 5) Makespan = 20 min. Transfer 5 Transfer  5 Transfer 5 Transfer 5

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Linear Programming  Linear Programming  Formulation Formulation n = number of sublots to be formed from the        original lot m = number of processes (machines) the lot         will go through p i  = processing time of one unit of the lot on         machine i.
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## This note was uploaded on 10/25/2011 for the course EIN 4401 taught by Professor Staff during the Fall '08 term at University of Florida.

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12 Lot_Streaming - LotStreaming LotStreaming LotStreaming LotStreaming Objective Objective BasicDecisions Numbe

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