Design Optimal Rack for a 3-dimensional Compact AS/RS with Full Turnover-based Storage
The automated storage and retrieval systems (AS/RSs) with multi-deep (3-dimensional) racks are popular solutions for high density storage of many product pallets in a limited space. In the racks, every pallet can be individually accessed with the help of automated storage/retrieval (S/R) crane taking care of movements in the rack horizontal and vertical direction, and a gravity conveying mechanism taking care of the depth movement in the rack. According to an ABC-turnover curve of invented items, usually some invented items are requested more frequently than others. In this paper, we study a 3-dimensional AS/RS with a full turnover based storage policy. We determine the optimal dimensions of the rack that minimize the crane’s expected single command cycle time under the full turnover based storage policy. A general model for designing an optimal rack is developed and can be optimally solved numerically. Results are compared with the performance of the random storage policy. It is shown that the optimal rack is Square in Time (SIT) for the crane’s moving face where the conveyor’s length is the longest. Significant reductions in the expected crane travel time are obtainable for the turnover based storage policy compared with the random storage policy.
warehousing compact 3 dimensional AS/RS rack design turnover-based storage
Yugang YU René (M.)B.M.DE KOSTER
Rotterdam School of Management,Erasmus University Rotterdam,the Netherlands
国际会议
北京
英文
2007-05-30（万方平台首次上网日期，不代表论文的发表时间）