shuttle based storage and retrieval system (SBS/RS) has been applied in many automated warehouses because of its high space utilization, flexibility and response speed. The efficiency of task scheduling has a profound...
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A shuttle-basedstorage and retrievalsystem (SBS/RS) is a relatively new material-handling facility. A multi-elevator tier-captive SBS/RS is a newly designed subset of such a facility. This new system consists of tie...
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A shuttle-basedstorage and retrievalsystem (SBS/RS) is a relatively new material-handling facility. A multi-elevator tier-captive SBS/RS is a newly designed subset of such a facility. This new system consists of tier-captive shuttle carriers, multiple elevators with a lifting table, and racks. The storage rack of the system is defined in terms of tiers, columns, and the number and position of the elevators. The aim of this study is to develop an efficient simulation model that can be auto-remodeled for different rack configurations. With this model, it will be easy for warehouse designers to test a large number of rack alternatives and to determine the optimal solution efficiently. Furthermore, the designers can illustrate the solution to shareholders through animation identical to the real system. A simulation case study is presented for a multi-elevator tier-captive SBS/RS containing 81 different rack alternatives. These alternatives are simulated under 15 different retrieval rates within 48 h, and finally, the optimal rack design is found out. We believe that our work will assist warehouse designers in efficiently designing racks of multi-elevator tier-captive SBS/RSs during early technology selection. (C) 2016 Elsevier B.V. All rights reserved.
Fulfillment centers located in densely populated urban areas are an ever-growing need for leading online consumer websites. These urban fulfillment centers have limited land mass and must have innovative solutions to ...
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ISBN:
(纸本)9781538626825
Fulfillment centers located in densely populated urban areas are an ever-growing need for leading online consumer websites. These urban fulfillment centers have limited land mass and must have innovative solutions to transport goods within the available vertical space. This work presents a Multi-Track Elevator (MTE) system, a competitive solution for rapid access and retrieval of goods in high-rise e-commerce fulfillment centers and warehouses. The MTE system consists of multiple vertical rails connected with angular traverse rails that allow multiple carriages to go up and down without collision. A novel turning point system switches track routes so that several carriages can move across the multiple rails for rapidly accessing many floors and collecting diverse goods. Unlike existing vertical-horizontal grid elevators and rail systems, the Roller-coaster type, self-powered carriages on the MTE system do not have to stop at switching points, but can continually move across the network of rails. This work walks through the architecture of the rail network system and techniques for switching multiple rails, followed by the design of vertical turntables for smooth, continuous rail switching. Finally, outlining the use of a simple route optimization algorithm, diverse elevator systems are compared with respect to total traveling time and distance. A proof-of-concept prototype has been built and is presented.
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