Part D, speeds and modular dimensions are the same as above For a single aisle of height 14 pallets and length 70 pallets, and class-bazed storage, determine the expected single-command cycle time. Storage requirements by class are {a%, b%, c%}. Activity by class is {e%, %, g%}. Use a continuous representation of the rack, and ignore any possible discrepancy between the modular spacing and what vou determine to be class boundaries. Parameters, physical, metric units data set 5 max L, m 70.20 max H, m 13.00 modular spacing per W, along aisle H, height D, depth horiz vel 4.5 vert vel 0.8 shuttle 7.5 pallets 54 pallets 10 pallet position, m 1.30 1.30 1.20 m/s m/s seconds Parameters, operation Desired storage capacity 12,500 Desired handling rate, in and out/hour 1500 Uptime 0.96 Part A, Random storage th T b E(SCT), travel, s E(SCT), total, s E(DCT), travel, s E(DCT), total, s f first iter. in Part B is 54 pallets long, there 15.60 16.25 16.25 0.960 21.24 36.24 28.68 58.68 will be more excess capacity Part B, System configuration, using only single-command operations initial pallet capacity/ aisle 1080 min. number of aisles needed 11.57 12 round up if needed Determine the number of aisles needed, 1 machine per aisle, two rack sides, single deep, to satisfy storage and handling requirements. Try to get b close to 1. Config Aisles L, pallets H, pallets L, m H, m total pallets th ty T b E(SCT), travel, s E(SCT), total, s cycles/hour system rate Comments 12 53 10 68.9 13 12720 15.31 16.25 16.25 0.942 21.06 36.06 95.84 1150 need more machines 13 49 10 63.7 13 12740 14.16 16.25 16.25 0.871 20.36 35.36 97.74 1271 need more machines W N 14 45 10 58.5 13 12600 13.00 16.25 16.25 0.800 19.72 34.72 99.55 1394 need more machines 15 42 10 54.6 13 12600 12.13 16.25 16.25 0.747 19.27 34.27 100.85 1513 STOP Part C Analysis for a single aisle single commands 0.55 dual commands 0.45 L, m H, m th ty T b E(SCT), travel, s E(SCT), total, s E(DCT), travel, s E(DCT), total, s E(CT), total, s pallets/cycle cycles/hour pallets/hour 54.6 13 12.13 16.25 16.25 0.747 19.27 34.27 25.97 55.97 44.04 1.45 78.48 113.8 Part D, configuration L, pallets 70 L, m 91 H, pallets 14 H, m 18.2 Area, sq.m. 1656.2 Space A: 0.15 B: 0.25 C: 0.60 1.00 Activity A: 0.50 0.35 C: 0.15 1.00