Solve Problem 11.5 except that the ratio of single-command to dual-command cycles is 3:1 instead of 1:1.
Problem 11.5
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 400 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 number of single command and dual command cycles are equal.