Question: The AS/RS aisle of Problem will he organized following a class-based dedicated storage strategy. There will be two classes, according to activity level. The more-active stock is stored in the half of the rack system that is located closest to the input/output station, and the less-active stock is stored in the other half of the rack system, farther away from the input/output station. Within each half of the rack system, random storage is used. The more-active stock accounts for 80% of the transactions, and the less-active stock accounts for the remaining 20%. Assume that system utilization is 85% and the number of single command cycles equals the number of dual command cycles in each half of the AS/RS.
(a) Determine the throughput of the AS/RS, basing the computation of cycle times on the same kinds of assumptions used in the MI-II method.
(b) A class-based dedicated storage strategy is sup-posed to increase throughput. Why is throughput less here than in Problem?
Problem: The length of the storage aisle in an AS/RS = 240 ft and its height = 60 ft. Suppose horizontal and vertical speeds of the S/R machine are 300 ft/min and 60 ft/min, respectively. The S/R machine requires 18 sec to accomplish a pick-and-deposit operation. Find:
(a) the single command and dual command cycle times per aisle and
(b) throughput for the aisle under the assumptions that storage system utilization = 85% and the numbers of single command and dual command cycles arc equal.