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

I made an example for the

"drawn without replacement"

http://www.bangsow.eu/detail_en.php?id=808

in this way you can create randomly the exact number of parts of a sequence

 Steffen Bangsowfreelance simulation specialist  web: www.bangsow.eumail: steffen@bangsow.net Re: Determination warm up period, run length, number of replications  Siemens Phenom

Hello,

I recommend the text book, or a newer issue

A. M., Law, W. D. Kelton. Simulation modeling & analysis. McGraw-Hill, New York 2000. The attached model contains the configuration of the Chart object. The model is for Plant Simulation 13.1.

Regards,

Peter

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

Dear @Nomden

Thanks for your reply! Please find attached my Excel file in which I calculated the portions of my products while calculating the average order per day per product. As you can notice, the sum equals 8.46, which is the same as I used in the calculation of my previous post:

Spoiler
Spoiler
Let`s assume that for a certain product there are 120 orders per year. The system is operational for 5 days a week for 5.9 hours a day (+-1500 hours a year). This are (5/7)*365 = 261 days per year. Hence, 120/261 = 0.46 products will arrive per day from this product type. I repeat this calculation for the complete product scope of 76 products and sum up the total amount of products per day. Assume this is 8.86. Then, 5.9 (working hours per day) / 8.46 = 0.67 hours = 40 minutes. Hence, I will set the negative exponential interval with a mean of 40 minutes and products will be selected based on the portion calculated above (0.46 for the example product). Lastly, the "blocking" must be cleared (deactivated).

Could you please check my Excel file and let me know if you agree with my consideration? And do you mean with the absolute numbers that you just multiply values like 0.06 or 0.04 with 100 and include 6.0 and 4.0 to the ProductMixTable?

Kind regards.

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

For the randomization you do not need to convert it to something that sums up to 100. So you can use the contents from column "Orders 2018" or any other column for the frequencies.

Gert Nomden
Digital Factory Consultant
cardsplmsolutions.com

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

Dear @Nomden,

Thanks for your reply!! And what do you think of the following from my other post?

Spoiler
Let`s assume that for a certain product there are 120 orders per year. The system is operational for 5 days a week for 5.9 hours a day (+-1500 hours a year). This are (5/7)*365 = 261 days per year. Hence, 120/261 = 0.46 products will arrive per day from this product type. I repeat this calculation for the complete product scope of 76 products and sum up the total amount of products per day. Assume this is 8.86. Then, 5.9 (working hours per day) / 8.46 = 0.67 hours = 40 minutes. Hence, I will set the negative exponential interval with a mean of 40 minutes and products will be selected based on the portion calculated above (0.46 for the example product). Lastly, the "blocking" must be cleared (deactivated).

Kind regards.

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

Quick calculation for 2018:

261 working days / year * 5.9 hours/working day=1539.9 hours/year

1539.9 hours/year / 3088 orders/year=0.4987 hours/order

The Random product selection does the rest.

Gert Nomden
Digital Factory Consultant
cardsplmsolutions.com

Re: Determination warm up period, run length, number of replications Builder
Dear @Nomden,

Thanks for your reply! And then without blocking, right? The interval will then be 0.49 hours and the frequencies are just the total orders per year?

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

To be sure create a seperate test model with a Source object and a Drain. The results should match!

Gert Nomden
Digital Factory Consultant
cardsplmsolutions.com