centrifugal force / modal analysis

- March 6, 2020 at 9:47 pm
  
  pkwes
  Subscriber
  
  Hi,
  
  Can anyone give me some clues as to how to introduce a centrifugal loading into a cantilever beam rotating about an axis which is at the root (clamped end of the beam) or offset from it.
  
  I am trying to find natural frequencies and mode shapes at given rotational speeds.
  
  Any examples / tutorials would helpful.
  
  Rgds.
  
  PK
- March 7, 2020 at 1:20 am
  
  peteroznewman
  Subscriber
  
  Static Structural has an Inertial load called Rotational Velocity. That is what you use to create centrifugal force on the mass in the model. All you need to do is define the axis of rotation and the rotational velocity. The solver will apply the correct acceleration as a function of the radius from the axis.
  
  You can use a Static Structural analysis to Pre-Stress the structure prior to extracting modal frequencies in a Modal analysis.
- June 24, 2020 at 1:57 am
  
  pkwes
  Subscriber
  
  Thanks very much for your help and sorry for the late response.
  
  I was able to do a static structural analysis to pre-stress the structure followed by the modal analysis and the results were good.
  
  I have another problem now.
  
  The geometry in now appears in the model stage with a question mark.
  
  I normally import my geometries from solidworks as IGES files.
  
  However, of late I get the question mark irrespective of the source of my geometry.
  
  What am I missing