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xyz12312-Amethyst
12-Amethyst
January 27, 2023
Solved

Convergence problems with functions and sampled signals

  • January 27, 2023
  • 1 reply
  • 1505 views

Hello all,

 

I have attached a sheet with a simple example function where the voltage jumps. This causes convergence problems. 

 

I am working actually more complex signal at a capacitor, but I cant share my actual sheet.

Basically my attached example is the same... I have waveform with a discontinuity.

 

Later I do a derivation of the voltage signal.

Also I want to do a FFT of this signal and therefore I sample it.

 

In any way I have convergence problems and I dont know how to handle that. Do you have an idea?

 

Here is a screenshot of the sheet in case you cannot open it:

 

xyz123_0-1674836557322.pngxyz123_1-1674836589632.png

 

Best answer by ttokoro

Use sampling data you can get what you want. Prime 8 sheet attached.

If you want its Fourier series, my answer bellow shows how to do it.

Fourier Puzzle - PTC Community

 

image.pngimage.pngimage.png

1 reply

X
xyz12312-AmethystAuthor
12-Amethyst
January 27, 2023

I changed to voltage function in the new sheet, have a look. This is more realistical to my actual convergence problem than the previous sheet. 

W
Werner_E25-Diamond I
25-Diamond I
January 27, 2023

How about defining Icap(t) using a "try ... on error ...." construct.?
The "try" case would contain the original definition of Icap and the "on error" case a meaningful value or rather a NaN.

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