The shaft moves according to the forces applied to it, and according to the dynamics of the shaft.
The dynamics of the shaft are a function of the mass, stiffness, and damping.
Clearly, the mass is greater in the vertical direction and the stiffness of the system is not equal in the vertical and horizontal directions.
Therefore, it is perfectly normal for the orbit to have an elliptical shape.
First published on LinkedIn by Aly Attia.
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