Learning Forum

[Kraehn_B]

Greetings to all,

I am currently performing parameter identifications for different hyperelastic laws. Looking for the definition of the residual calculation expression, I only found this explanation in the ANSYS help : "The error norm can be set to use normalized or absolute error. Normalized error norm considers each experimental datum equally in computing the curve fit. It generally provides better results than the absolute error norm, but in some cases the absolute error norm is a better choice.".

Is the exact expression of this parameter (normalized or absolute error) given somewhere?

 

Thank you in advance for your time,

[John Doyle]

Below are the equations.  I cannot find these in our docs either.  This is not really an FEA issue.  These expressions can probably be found in any statistics or probability textbook.

[Kraehn_B]

Thank you very much for your answer!