Unites of the transfer rates

Question

Day 2023-5-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956699-unites-of-the-transfer-rates

评论： Day 2023-5-19

Hi,

The simulations of my model differ at different unites of transfer rates. For example, the following are plots for the same variable but for different time scales. Could you please help me to figure out the reason?

2 个评论
显示无隐藏无

Arthur Goldsipe 2023-5-3

I'm not sure I understand your question. Can you share reproduction steps?

I think you're saying that changing your simulation stop time from 5000 hours to 3e5 minutes (which should be equivalent) changes the results of your simulation. If that's the case, I can think of a couple of possible explanations. But it would be easiest to confirm if you could share a model that reproduces this problem.

Day 2023-5-19

Yes, correct.

I am sorry I can't share my model because it belongs to a project

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Arthur Goldsipe 2023-5-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956699-unites-of-the-transfer-rates#answer_1239754

Did you enable UnitConversion for your model? If not, then you will need to manually update your entire model to use consistent time units when changing the sto ptime from hours to minutes.

If you did enable UnitConversion and see this difference, then another common cause of mistakes is incorrectly handling units when calling functions. There's a tip about this on the UnitConversion reference page: "Non-dimensionalize the parameters that are passed to the function if they are not already dimensionless."

Lastly, I suggest reading these simulation troubleshooting tips. In particular, you might want to see if the discrpancy can be removed by disabling AbsoluteToleranceScaling.