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

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02-06-2019 03:56 AM

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

Steffen Bangsowfreelance simulation specialist web: www.bangsow.eu mail: steffen@bangsow.net |

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

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02-06-2019 04:31 AM

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.

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

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02-06-2019 04:38 AM

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 Bangsowfreelance simulation specialist web: www.bangsow.eu mail: steffen@bangsow.net |

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

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02-06-2019 04:49 AM

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.

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

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02-06-2019 04:52 AM

you need to change the labels of the chart:

x : simulation time

y: parts per hour (+title)

Steffen Bangsowfreelance simulation specialist web: www.bangsow.eu mail: steffen@bangsow.net |

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

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02-06-2019 05:34 AM

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

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02-06-2019 05:49 AM - edited 02-06-2019 05:50 AM

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 Bangsowfreelance simulation specialist web: www.bangsow.eu mail: steffen@bangsow.net |

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

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02-06-2019 06:53 AM

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:

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

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02-06-2019 07:20 AM

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 Bangsowfreelance simulation specialist web: www.bangsow.eu mail: steffen@bangsow.net |

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

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02-06-2019 08:10 AM

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.

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