Difference between Vertical and Horizontal shaft rotordynamics

[Mechie_85]

Hello all,

I am new to physics forums so please excuse my posting mistakes (if any).

I wanted to know how different is the rotordynamics when one is analysing a vertical machine v/s a horizontal machine ? Is it substantial or we can analyse it as a horizontal machine and extend the results to the vertical machine ?

This question came to my mind since in a horizontal machine your center of gravity is acting uniformly across the entire length while in a vertical machine your center of gravity is just acting in the vertical downward direction (there might be a moment acting in this case when the shaft undergoes different modes).

Thank you,

 

[Navin A S]

John </code>The major difference between a vertical and a horizontal machine is the orientation of the center of gravity. In a horizontal machine, the center of gravity is acting uniformly across the entire length, whereas in a vertical machine, the center of gravity is acting in the vertical downward direction. As a result, the rotordynamics of a vertical machine can be substantially different than that of a horizontal machine. This means that the analysis of a vertical machine cannot simply be extended to a horizontal machine. When analyzing the rotordynamics of either a vertical or a horizontal machine, it is important to consider factors such as the mass and stiffness distribution of the rotor, the gyroscopic effects, and the bearing support structure. Additionally, it is important to consider the effects of external loads and moments, such as gravity, centrifugal forces, and gyroscopic moments. All of these factors must be taken into account when analyzing the rotordynamics of either a vertical or a horizontal machine.