Rotating systems are subject to gyroscopic forces such as Coriolis and centrifugal forces that are not present in stationary systems. NX Nastran Rotor Dynamics software provides the capability to predict the dynamic behavior of rotating systems. With the Rotor Dynamics functionality now integrated into NX Nastran and supported by Femap, users can now more easily simulate rotating system loads, perform synchronous and asynchronous analysis to generate Campbell Diagram data, predict whirl frequencies and critical speeds and detect instability in rotating components.