Dear all,
Here I have a seris of fexible pipes which I have to get a fatigue analysis of.

I confirm to give them a displatement and the frequence to be the boundary condition.

I have the continuous questions to doult with:

1)How could I decide this pipe experience a small deformation to confirm the analysis as a suitable condition.
For example, my pipe is 3,000mm length and the displatement is +&- 5mm. So 5 is enough small as to 3000.
But I have no formula to identify.

2)As I known that in this high frequency consition I have to use the dynamic Harmonic model.
But I can not find how to give the right condition as I say.
My displatement is +&- 5mm around the balance location. However, in the harmonic displatement settings I can`t find that how to set this.

3)How could I get the dynamic response of the force and the moment by the vibration? Does the data of the restrains in the (FAT)load case show the right result?

Hope for your kindly help.

yours,Gaberiell