The simulation model analyzed two different scenarios
obtained by altering the number of AGVs available
for product movement. The residual analysis shows that
the assumptions be satisfied for all performance
measures, so that further statistical analysis can be
carried out. From the results of the analysis of variance,
the AGVs number drastically affects the average
delivery time, the average throughput, and the average
AGVs utilization at 95% confidence level. The least
significant difference method is used to contrast all
pairs of the two scenarios under each of the performance
measures. Results of the paired test analysis
are summarized in Table 7. As can be seen, these
two scenarios are ranked best (left) to worst for
average delivery time and are ranked best (right)
to worst for average throughput and average
AGVs utilization. Each value is the mean of the
performance data collected in the 10 replications. The
simulation results indicated that a balance among
delivery time, throughput, and AGVs utilization be
realized with AGVs number (=2).