ENM 307 SIMULATION
03.03.2016
Jobs arrive at an assembly workstation with exponentially distributed inter-arrival times of
mean 5 hours. The assembly time is uniformly distributed between 2 and 6 hours. After the
process is completed, a quality control inspection is performed, and past data reveal that 15% of
the jobs fail any given inspection and go back to the assembly operation for rework (jobs may
end up going through multiple reworks until they pass inspection). Jobs that pass inspection go
to the next stage, which is a painting operation that takes 3 hours per job. Simulate the system
for 1000 hours to estimate the following performance measures:

average waiting time of a job in assembly queue

average waiting time of a job in painting queue

average number of jobs in assembly queue

average number of jobs in painting queue

average number of reworks per job

average flow time (total time in the system) for a job
Source: Altıok, A., Melamed, B. (2007). Simulation Modeling and Analysis with Arena, Academic Press.