Before revision: In rotordynamics 300px|Analytical Campbell Diagram for a Simple Rotor In rotordynamical systems, the eigen frequencies often depend on the rotation rates due to the induced gyroscopic effects or variable hydrodynamic conditions in fluid bearings.
After revision: In rotordynamics 300px|Analytical Campbell Diagram for a Simple Rotor In rotordynamical systems, the eigenfrequencies often depend on the rotation rates due to the induced gyroscopic effects or variable hydrodynamic conditions in fluid bearings.