Thanks for answers.

I also thought about extracting the profile of the metal base into the beams. If the base is in the form of beams and the pipes are solids, will this be ok? Unfortunately, the profile has a flat only vertical wall, the horizontal walls are upper and lower with a bevel.


>>You can assign the 10 MPa internal pressure in a Static Structural model and feed the Solution cell of that into the Setup cell of the Modal analysis. This will cause the stiffening that the pressure causes to the pipe to be taken into account.

So my harmonic calculation by the superposition method will have three modules:

  1. Static structurtal where I will apply pressure inside the pipes.
  2. Modal - natural frequencies
  3. Harmonic response - forces on the pipe where the pump is connected.