We need help using Multiservice

[livti]

Hi everyone,

We are two student and this is our first semester working with ED. We have to model an airport with 9 gates. Every hour an average of 12 aircrafts arrive at this airport. 25 % of these aircrafts have problems at the gates. The normal handling time at the gates is uniform(1200,2400). But the aircrafts with a problem need to get extra handling with a uniform(1800,2400). Aircrafts with a problem get the label 1, the others label 2.

What we have to do is we have to create a Central Multiservice where every aircraft with problems is send to. This multiservice has a capacity of 4 aircrafts.

We were able to simulate the arriving aircrafts, the gates and queue, but we have problems to simulate the situation from the gates to the multiservice or the sink.

To solve the problem we tried using the "send to"-case at the server and said, that aircrafts with label 1 have to be sent to the multiservice whereas the rest can go strictly to the sink. But however this didn't work.

We hope now that someone outthere can help us.

Thanks a lot!
Greets, Livti

[marlies]

Hi,

I noticed that you used the option to compare based on label text (nr 9 of sendto options), but as you use the label as a value (1 or 2) it is better to use option nr 8 by label value conditional.

Regards, Marlies

[livti]

Hi Marlies,

thanks a lot for your quick help! Now it works perfectly fine and our model is ready for use

Thanks again!

Have a great day!
Greats, Livti

[livti]

Hi Marlies,

it's us again. We were too quick with our last post as we now have a new problem with the same model to solve and we hope you have again a good idea how to do it.

As you have seen in our model, the server has to cope with two different kinds of products: airplanes with problems and airplanes without problems. Now we need the following thing: if the server gets an airplane with a problem, a team of operators is called and they are going to fix the problem with a uniform(600,1200). We wanted to program this at the "trigger on entry"-part of the server with the help of an if-sentence. That means, if the Label[Problem] is 1, then calll an operator, else handle product with an uniform(1200,2400).

As we are not that good in programming, I think we have a mistake in the used string. So, maybe you have an idea how to solve this?

Thanks for your help!
Greets, Livti

[marlies]

Hi,

I would suggest to model this with a setup time when the product has the label "problem". Release the operator on the end of setup, afterwards the usual process time can be executed.

See attached for a small example.

Regards, Marlies

[livti]

Dear Marlies,

thanks a lot for your great help! You've saved our model and we are now able to present our results.

Thanks!

Greets,
Livti