Elevator Example 2

We have extended our Elevator Example from Lesson 1 to include the new concepts discussed in Lesson 2. First of all, it is now possible to choose the number of employees(1-99) and the number of elevators(1-4) in the system. Every elevator has its own queue and when an employee arrives in the system, he/she will choose a queue based on the number of employees in front of each elevator. The time for the elevator between departure and arrival no longer depends only on the number of employees inside but also on the destinationfloors(1-20) of the employees. The traveltime of the elevator is based on the following assumptions: 1,5 sec traveltime per floor, 4 sec stoptime and 2,5 sec for an employee to leave the elevator. The total traveltime of the elevator is therefore given by:

3 sec * max(floornumber) + 2 sec * (number of employees inside) + 4 sec * (number of stops)

Based on the model described above, queuetime, service time and queue length can be computed. These statistics can be defined in the following way:

• Queue time : the time between entering the queue and entering the elevator
• Service time: the time between entering the elevator and leaving the elevator
• Queue length: the length of a queue (recorded every time an employee enters a queue)

Back to Lesson 2

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