Originally posted by: -3300-

Hey 

I have a big Problem and I hope you can help me. I try to model fix cost for every truck, which the program use. Every truck have a capacity of 25 tons. 

In my model I try to minimize the cost of the fix cost from every vehicle and the variable cost for the transport. 

I generated this one. But my model only minimize the variable cost. 

Thanks for your help.

Hi,

do you mean each time there is a flow between a source and a destination , you should have an additional fixed cost ?

regards

Originally posted by: -3300-

Hex Alex,

Thank you for your answer.

Yes, I mean each time there is a flow between a source and a destination, the model should calculate fixed cost for the truck.

Hi,

then you could try

float fixedCost=100;

dvar boolean x[source][destination];

and then turn the objective into

minimize sum (i in source, j in destination, k in goods) (d[i][j][k] + L[i][j][k]) * c[i][j] +
    fixedCost*sum(i in source,j in destination) x[i][j] ;

and add a new constraint in the subject to block

forall(i in source,j in destination)    (x[i][j]==0) => (0==sum(k in goods)(d[i][j][k] + L[i][j][k]));

regards

https://www.linkedin.com/pulse/ist-mathematische-optimierung-und-wie-kann-sie-helfen-alex-fleischer/