Cannot use label

I use the discrete model to simulate a barge operation in a container terminal. For each barge, a maximum waiting time will be assigned, so, in my model, I set 4 labels to calculate the waiting time of each barge. This can be done by using arrival schedule of the source. However, when the source changes the arrival style to an inter-arrival time and uses distribution to represent it, the labels cannot work. How to assign labels when the arrival style is inter-arrival time?

Hi,

You can do it in 2 ways.

First is to create the labels on the FlowItem in FlowItemBin and then use the pick option Set Label in OnCreation or OnExit trigger on a Source.

The second way is to use Create and Initialize Label you will find that pick option also under OnCreation and OnExit.

Lars-Olof

Thanks for your useful reply.

Recently, I cansider that the service time of barge berths are not 100%, in some case, the berth will stop service due to equipment maintaince or other reasons. So, can Flexsim discrete model set the service time of the processors?? For example, berths will operate only 16 hours a day. Thanks for any advice.

Hi,

Take a look at Time Tables, there you can define when the berth will be available. Time Table is used when you know when the berth is down.

If the down time is random you should use MTBF/MTTR.

Lars-Olof

For example, I use the code[By time of day] to design where it is operating or not, but error occured. What is wrong in my coding??

treenodecurrent = ownerobject(c);

/**By Time of Day:*/

int second = 1;

int minute = 60;

int hour = 3600;

int day = 86400;

int shift = 28800;

/** \nModel Time Unit: */

int timeunits = /**/minute/**/;/** (second, minute, hour, day)\n*/

int timeinseconds = fmod(time()*timeunits, day);

hour = trunc(timeinseconds / hour);

shift = trunc(timeinseconds / shift) + 1;

/**\n*/

/**/if(hour > 0&& hour < 1)

return 0.3 + 0.2 * beta(2.19, 2.11,0,0,0);

else if(hour > 1&& hour < 2)

return 0.25 + 0.24 * beta(2.73, 4.73,0,0,0);

else if(hour > 2&& hour < 3)

return 0.14 + 0.28 * beta(6.88, 13.1,0,0,0);

else if(hour > 3&& hour < 4)

return normal(0.348, 0.0521,0);

else return 9999999999999999999999;/**/

Hi,

The only thing I can see from your code is on first line.
It should be treenode current and not treenodecurrent.

It is easier to see what the problem is if you send your model.

Lars-Olof

Here is my updated version on barge test, as I just want to simulate 4 hours in this model with hourly distribution, so i try to use [if statement] to decide the arrival distribution patter. But it cannot generate any items.

If I change to arrival schedule, the model is correct.

Many thanks for any advice.

Hi,

Try to change the code to this:

if(hour >= 0 && hour < 1)
        return 0.3 + 0.2 * beta(2.19, 2.11,0,0,0);
    else if(hour >= 1 && hour < 2)
        return 0.25 + 0.24 * beta(2.73, 4.73,0,0,0);
    else if(hour >= 2 && hour < 3)
        return 0.14 + 0.28 * beta(6.88, 13.1,0,0,0);
    else if(hour >= 3 && hour < 4)
        return normal(0.348, 0.0521,0);

Lars-Olof