Hello Abaqus CommunityAbaqus 

I am new to Fem and Abaqus. I am currently working on a vibro-acoustic calculation of a gearbox. The goal is to calculate the sound pressure around the gearbox using an open source python library called BEMPP, which necessitates the normal velocities of the nodes that are on the outer surface of the gearbox.

Here’s a brief overview of my analysis steps:

1. Structural Analysis: I conducted a direct Steady-State Dynamic (SSD) analysis on the gearbox structure using Abaqus standard. The analysis provided the translational and rotational velocities at the outer surface nodes.
2. Command Used for Velocity Output: In my .inp file, I used the following command to extract the six components of velocity (3 translational and 3 rotational):
   
   *NODE PRINT, NSET=erp, FREQUENCY=1
   V
   
   
3. Intended Use of Velocities: These velocities are intended to be used as boundary conditions in a subsequent acoustic analysis with BEMPP, where specifically the normal components are crucial.

My Question: Is there a way to directly output the normal component of the nodal velocities from an SSD analysis in Abaqus instead of 6 components? If not directly, what would be the recommended approach to compute the normal velocities from the available translational velocity components?

Any guidance on how to efficiently extract or calculate these normal velocities would be greatly appreciated.

Thank you in advance for your help!

Best regards,
Prashanth