Question on the utilization of AGV elevators
Accepted solution
When I run your model I am getting errors because you are trying to read from rows in the Origin Table that do not exist. You should probably fix this first before running experiments.
The "waiting" state is set in the "Open/Close Door Delay" activities in the elevator flow.
The error still happens. The maximum row value used when creating the tasks is 57. Currently the Origin Table only has 54 rows.
I would say the utilization values are correct. With more AGVs you more often have the case that once an elevator arrives at the ground floor another AGV will enter right away and be transported up, thus moving efficiently. With fewer AGVs, the same elevator might first travel back up empty to move another AGV down, before the next AGV arrives at the ground floor, increasing the overall travel distance and thus utilization.
As you can see below, the loaded travel distance and the loading/unloading times stay very similar, mostly just shift between the three elevators. While the travel empty duration increases, especially for lift A.
