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Title: Redundancy in Warehouses: Technical Constructions, Operation Strategies and their Impact on Throughput
Authors: Schulze, Lothar 
Issue Date: 2007
Publisher: University of the Thai Chamber of Commerce
Source: Lothar Schulze (2007) Redundancy in Warehouses: Technical Constructions, Operation Strategies and their Impact on Throughput.
Conference: Proceedings of the 2nd International Conference on Operations and Supply Chain Management 
The increased division of labor and the rising integrationof globalized supply networks led to a backlash from thezero-inventory company to an upswing in the demand ofwarehouses. Simultaneously, there is no acceptance ofdelayed deliveries. Companies employed in global supplynetworks thus have a growing demand for warehousecapacity on the one hand side and high availability of thegoods stored therein on the other. Furthermore, thewarehouses must be operated with highest efficiency tominimize the effect on the company’s revenues.All these demands often lead to the planning andoperation of high-bay warehouses with automated storageand retrieval systems, short AS/RS. In these systems thehigh bay concept leads to high capacities per floor spaceand the AS/RS offers low operation costs. A problem thatoften occurs is the low redundancy connected to the usageof AS/RS. This results from the often strict association ofone automated storage and retrieval machine to a singleaisle of the warehouse. In the following work differenttechniques to raise the availability of the warehousesystem by implementing additional redundancy areintroduced. A conventional technique mentioned is themethod of implementing aisle changing storage/retrievalmachines. An innovative method is to develop a system inwhich each load unit stored in a rack can be accessedfrom the two aisles surrounding the rack, in other words,two AS/RS have access to each storage unit.This new technique is introduced and the advantages anddisadvantages are elaborated. Throughput-maximizingstorage strategies are developed with consideration of thedesired maximization of redundancy. The conventionalmethod of aisle changing AS/RS is compared to theinnovative one by means of remaining capacity andremaining throughput in case of a breakdown, complexityof the operation strategies and investment to realize thesolution. The conclusion helps operators to decide whichvariant suits their needs best.
Rights: This work is protected by copyright. Reproduction or distribution of the work in any format is prohibited without written permission of the copyright owner.
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