how to calculate axial vibration?

[Pierre-zhu]

First of all, I want to thank all people involved in building up this fantastic open source tool for rotor dynamics. I am begginer ,I want to calculate axial vibration's free modal. but I can find any discuss or case, who can help me?

[jguarato]

Hi @Pierre-zhu,

I'll try to help you.

Start by creating a rotor model without bearing elements. Ensure that the model has 6 degrees of freedom to properly account for axial vibrations. For instance, instead of using the ShaftElement class, use the ShaftElement6DoF class for shaft elements, and the DiskElement6DoF class for disks. Once your model is set up, you can use the run_campbell method to analyze the system's modes and identify the axial modes. Also check discussion #1041 to see if it helps you.

Make sure your version of the ROSS library is up-to-date, as newer versions may include improved features and bug fixes.

[Pierre-zhu]

I have another question : how to set up one earthing stiffness (thruter bearing) for one node?

[jguarato]

Hi @Pierre-zhu!

As far as I know, there is no specific model for the thrust bearing available in ROSS yet. You would need to use the generic BearingElement class. Some people are working on this model right now, but I don't know exactly when they will make it available for use in ROSS.