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An analysis of the multi aisle AS/RS: multi aisle system served by the aisle transferring S/R machine
Lerher, Tone ; Flašker, Jože
This study deals with new analytical travel time models for multi-aisle AS/RS.The models consider the real operating characteristics of the storage and retrieval machine such as acceleration and ...deceleration rate and the maximum velocity. Assuming uniform distributed storage rack positions and the probability theory, the expressions of the cummulative distribution functions, through which the average travel time is calculated, have been determined. The computational models enable the calculation of the mean travel time for single and dual command cycles, from which the performance of multi aisle AS/RS can be evaluated. The proposed analytical travel time models deal also with cases when the sequencing of storage and retrieval request is performed in two randomly chosen picking aisles. A simulation model of multi-aisle AS/RS has been developed to compare the performances of the proposed analytical travel time models. The numerical analyses show that the results of proposed analytical travel time models correlate with the results of simulation models of multi-aisle AS/RS.
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