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Traction / braking graph Rate Topic: -----

#1 User is offline   Albertosaurio65 

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Posted 02 May 2021 - 03:15 PM

Hello, I have 5 train manuals where it says all kinds of information, and I have this scheme to be able to make the braking and traction curves, but it is impossible for me to calculate other points, is there any method to get the exact coordinates of any point?



Attached Image: grafica.jpg

#2 User is offline   Aldarion 

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Posted 03 May 2021 - 03:25 AM

Hi.

The only method is using polynomial interpolation.
Ity is a complex numerical analysis method to approximate graph curves given a few points.

#3 User is offline   RR1 

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Posted 03 May 2021 - 01:48 PM

 Albertosaurio65, on 02 May 2021 - 03:15 PM, said:

Hello, I have 5 train manuals where it says all kinds of information, and I have this scheme to be able to make the braking and traction curves, but it is impossible for me to calculate other points, is there any method to get the exact coordinates of any point?



You can use a digitizer package such as Engauge Digitizer. It's available on GitHub here.

I've used it to digitize some pretty complicated graphs. Accuracy was essential. Lot's of image import options.

There are others out there also.

#4 User is offline   R H Steele 

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Posted 03 May 2021 - 06:17 PM

 RR1, on 03 May 2021 - 01:48 PM, said:

You can use a digitizer package such as Engauge Digitizer. It's available on GitHub here.

I've used it to digitize some pretty complicated graphs. Accuracy was essential. Lot's of image import options.

There are others out there also.

Now, that's very cool. Thanks much!


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