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General Mechanical

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

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

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    • 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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