Consider a manufacturing system comprising two different machines and two
operators. Each operator is assigned to run a single machine. Parts arrive with an
exponentially distributed interarrival time with a mean of 3 minutes. The arriving
parts are one of two types. Sixty percent of the arriving parts are Type 1 and are
processed on Machine 1. These parts require the assigned operator for a 1-minute
setup operation. The remaining 40% of the parts are Type 2 parts and are processed
on Machine 2. These parts require the assigned operator for a 1.5-minute setup operation. The service times (excluding the setup time) are lognormally distributed with a
mean of 4.5 minutes and a standard deviation of 1 minute for Type 1 parts and a mean
of 7.5 minutes and a standard deviation of 1.5 minutes for Type 2 parts. Run your
model for 20,000 minutes, with 20 replications. Report the utilization of the machines
and operators. In addition, report the total time spent in the system for each type
of part.