The attached snapshot is the create module in Arena. I have a maximum number of entities arrive to the system (20). If I set the mean time between arrival=1 minute and run, the net arrived entities will be 14!. If I make it 10 minutes, the net arrived entities will be 19. So the two parameters, namely max arrivals and Time between arrivals>>Value are independent. The question is how to make these two parameters dependent?
I appreciate any answer.
type:constant
value:1
units: minutes
entities per arrival:1
max arrivals:20
first creation:0.0
Dear Dr Anand,
Thank you for your answer. The interarrival distribution is random not constant.
Dear Mahmoud,
How long for a simulation run?
Could you tell me what the dependence between interarrival time and maximum arrivals is?
Dear Dr Ngoc,
The simulation run is one day, and the day is 8 hours.
Regarding the interarrival time, I have an exponential distribution with 10 minutes mean time. In terms of the maximum arrival, it is 20 entities. The problem is when I run the model, the number of entities in is 19 not 20. When I changed the interarrival time to be constant with mean 10 minutes, the problem is still existed, 19 instead of 20.
Hi Mahmoud,
The result is 20 entities are created
Here is my model:
The model includes 1 Create module, 1 Record module which is used to count the number of entities which go through this module and a Dispose module
Create module:
- Time Between Arrivals:
+ Type: Constant
+ Value: 10
+ Units: Minute
- Entities per Arrival: 1
- Maximum Arrivals: 20
- First Creation: 0.0
Record module:
- Type: Count
- Value: 1
- Counter name: Ent_Arr
Run setup:
- Number of replications: 10
- Replication Length: 1 day
- Hours per day: 8 hours
- Base time units: minutes
The result indicates that in a replication, number in: 10, number out: 10, Ent_Arr: 10.
When I change the Time between Arrivals to Expo with 10 minutes, the result is still the same. My conclusion is that there are exactly 20 entities created.
Dear Dr Ngoc,
Thank you for your reply. It seems that there is unclear error in my model. I am attaching it if you could resolve.
Dear Mahmoud,
I really don't know this case. I copy your model and paste to the new model, and run the simulation. There are 20 entities created.
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