So it's best to leave that Kfriction = 0 if we want to check the natural frequency of a piping system ?
Yes, that is how I would make the run.
I've seen a practice to close the restraint gaps on the piping system when you run a natural frequency analysis. Would this be an acceptable approach?
I wouldn't change the model. This is what that first input field is for on the "Control Parameters" dialog. You point to a reference Static Load Case so that
CAESAR II can linearize the model. If the gap closes in the reference case
CAESAR II leaves the restraint but takes out the gap for the dynamic analysis. On the other hand, if the gap doesn't close,
CAESAR II removes the restraint for the dynamic analysis.
By not changing the model you can go back to the Dynamic Input and reference a different (static) load case and see if there are any effects on the dynamic results (aside from the frequencies changing).
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