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Re: Determination warm up period, run length, number of replications

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

I can only open your model in version 14.2. and there it is working fine

 

you should reset the statistics after e.g. 8 days to delete the model-fill from the statistics

 

chart.png

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Determination warm up period, run length, number of replications

Builder
Builder

Dear @Steffen_B,

 

See below my charts after 100 days and 365 days, respectively. As you can see, the chart is not displayed well for the 365 days setting. Can I assume that the graph will be the same as for 100 days? Furthermore, in your case it stabilizes after 8 days and in my case after 25 days approximately. What could be the reason for this?

 

Many thanks in advance.

 

Chart 100 days.JPGChart 365 days.JPG

Re: Determination warm up period, run length, number of replications

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

I have set the start stat value in the eventController to 8 days

 

one problem could be, that the 20.000 values are not sufficient to display a period of 180 days, so the plot is incomplete

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Determination warm up period, run length, number of replications

Builder
Builder

Dear Steffen_B,

 

I guess it works perfectly now!!

 

One last question concerning the interpretation of the graph. How should I interpret the Y-axis? I believe the X-axis just displays the time period of the simulation, right?

 

Many thanks in advance.

 

Kind regards.

Chart 365 days good.JPG

Re: Determination warm up period, run length, number of replications

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

you need to change the labels of the chart:

x : simulation time

y: parts per hour (+title)

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Determination warm up period, run length, number of replications

Builder
Builder

Thanks @Steffen_B !!

 

So on the Y-axis, the parts per hour are displayed? I have some doubts here since from 121 days until 365 days the parts per hour is quite stable around 1.8. Which is 365 - 121 = 244 days * 24 hrs = 5856 hrs / 1.8 =  3253.333 parts, whereas the total output is only 2832.

 

Am I missing anything here?

 

Many thanks in advance.

Re: Determination warm up period, run length, number of replications

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

you assigned a shift calendar to the drain, so the calculation of the part per our is a little bit more complicated (you dont work at the weekend and only 5,x  hours at a working day)

 

so you need to calculate

365 days *(5/7) = work days * 5,9 hours/day * 1,8 Jobs per hour = total output

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Determination warm up period, run length, number of replications

Builder
Builder

Thank you @Steffen_B. Clear!

 

Concerning the Shift Calendar, this is also connected to the "Source" where parts are produced. See below the dialog window:

 

Source.JPG

 

So on average, each 2:50:00 hours a product is produced. But this "production" continues outside "shift hours", right? However, products are only released during "shift hours".

 

Please let me know if I`m incorrect here.

 

Many thanks in advance.

Re: Determination warm up period, run length, number of replications

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor

the behavior depends on the setting of blocking

 

if you activate blocking, then the source will continue creating parts during the breaks and unplanned times. All the created parts will be released, if the source is working (normally in a much shorter interval than in the field interval).

 

if you deactivate the blocking option, all the parts, the source is creating in the breaks and unplanned times will be deleted. So, the source will release the parts during its working hours in the set interval

Steffen Bangsow
freelance simulation specialist  
web: www.bangsow.eu
mail: steffen@bangsow.net

Re: Determination warm up period, run length, number of replications

Builder
Builder

Dear @Steffen_B,

 

Thanks for your reply! In another thread " Forum discussion " I already described my method to create a proper arrival pattern based on the orders per year. Nevertheless, at that moment the model was running for 24/7, whereas now a shift calendar is included, in which the model only works for 5 days a week and 5.9 hours a day.

 

What would be your recommendation in terms of the dialog window of the source to properly model the arrival distribution? And would it be best to activate or deactivate blocking in that case?

 

Many thanks in advance!!

 

Kind regards.