First Arena Model
Assumptions and Need to have Model of a single stage process. One type of resource. Two type of entities: simple and hard cases Parameters: Arrival time distribution: EXPO(7.5). Every 7.5 minutes a case arrives (about 8 per hour) in minutes Process time distribution: 70% is TRIA (3, 12, 16) - the simple cases 30% is UNIF (20, 30) – the hard cases
Open Arena in Arena Folder
Accept the terms
Add a Create, Decide, 2 assign, 2 process, and one dispose Add a Create, Decide, 2 assign, 2 process, and one dispose. Connect as shown. The connect tool is here.
Double click on the Create module. A window opens Change to 7.5 Change to minutes Then click OK
Double click on the Decide module Change to 70 Then click OK
Double click on the top assign module. This is for the simple cases Type: simple_cases Then click Add
A new window, select Entity Type and write simple_c First select Entity Type Then type Simple_c Click Ok
Should look like this, click Ok
Repeat for the second assign Use hard_cases for the name of the module Use hard_c for the Entity Type
Double Click on the Process Module Change to Seize Delay Release
The form will change, need to ID the resource Click on Add
Make up a name for your resource Type in a name for example: worker Then click OK
Now we will add the process time distribution Type in the Parameters for Triangular
Do these changes Change to Minutes Then click OK The parameters
Repeat for process 2 The resource should be the same. Use the Unif (20,30) parameters Should look like this >
Next go to Run, Setup
Go to Replication Parameters Tab Change to 8 Change to Minutes Then click OK
Save the model. Be sure to save it in the documents or desktop.
Click on Run
Click on yes to see the results
Click on Entity (report) Average wait times in minutes
To go back to the model close the page
To edit the model, must End it
To change the number of workers available Scroll down to Resources Change to 2
Next steps Click on Run View the results for Entity, Resource, …
Analyze different rules, for example change the priority of processes