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[modal analysis] How do I calculate natural frequency with rotational stiffness

- October 17, 2024 at 2:48 am
  
  minia1236
  Subscriber
  
  As shown in the attached figure, foundation stiffness was applied to the x, z direction surfaces of the plate and the bottom of the plate with elastic support. And I want to apply rotational stiffness for x, y, z rotation direction. But I can't find related function in ansys modal GUI. I want to know how I can apply rotational stiffness.
- October 17, 2024 at 5:57 pm
  
  dlooman
  Ansys Employee
  
  The elastic supports you have defined will produce a lot of rotational stiffness about the Y axis already. But, if you want to specify a rotational stiffness you could scope a torsional spring to the cylindrical surface at the edge of the hole. You might need to turn on beta features for the torsional spring option to be displayed.
  - October 18, 2024 at 4:02 am
    
    minia1236
    Subscriber
    
    I found spring-torsional in connections. Thanks for the help.

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