About AS/RS (1/7). About AS/RS (2/7) Research areas  Storage locations assignment  Storage and retrieval policy  Physical design.

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Presentation transcript:

About AS/RS (1/7)

About AS/RS (2/7) Research areas  Storage locations assignment  Storage and retrieval policy  Physical design

About AS/RS (3/7) Storage locations assignment  Randomized Uniformly Closest open location  Class-based Turnover ratio  Dedicated

About AS/RS (4/7) Storage and retrieval policy  Single command (SC) First-come-first-serve  Dual command (DC) First-come-first-serve Dynamic TSP problem  Assignment problem (static & dynamic)  Nearest neighbor

About AS/RS (5/7) Physical design  Configurations of rack Height & Length  Velocity Acceleration & Deceleration  Dwell point Bozer & White(1984) E(SC)=[ ] T E(DC)=[ ] T

About AS/RS (6/7) Performance measure  Travel time  Throughout

About AS/RS (7/7) Load types  Mini-load  Unit-load

Effects of relocation to AS/RS storage location policy with production quantity variation

Introduction Experiment design Simulation Result Conclusion

Introduction The performance of will not be good if production quantity variation and current storage policy is kept Find the tolerance limits and appropriate strategies for storage policy when production plan change Random,2 and 3 class-based will be examined

Experiment design (1/3) There are 20 items in the production plan Production quantities vary between % Items are assumed as end products For 2 class-based storage  Top four items: first class

Experiment design (2/3) For 3 class-based storage  Top four items: first class  Next six items: second class For random storage  1500, 5000 and unit storage time Relocation process will be done whenever the crane idles

Experiment design (3/3)

Simulation (1/4) GPSS Simulated for 900,000 unit time Warn up 300, ,000~600,000 unit time: original Repeat 10 times

Simulation (2/4)

Simulation (3/4)

Simulation (4/4)

Result (1/3) Random storage

Result (2/3) 2 class-based

Result (3/3) 3 class-based

Result(4/4)

Conclusion (1/2)

Conclusion (2/2) Class-based storage policies perform better but have a lower tolerance Class-based would be better if performance is the most critical issue If performance is not critical and frequent production plan changes are expected, random storage would be better