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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › Mode is 0 and circular beams › Reply To: Mode is 0 and circular beams

November 9, 2024 at 1:22 pm
peteroznewman
Subscriber

The wheel is free to spin on the shaft.  That means there is zero stiffness in the rotational direction, which results in a zero frequency.  After you change the revolute joint to a fixed joint, the wheel now has a stiffness to ground in the rotational direction and you get a non-zero frequency.  I explained how the intertial load of rotational velocity works in your other discussion.