An
algorithm can detect and decouple the mixed free body modes
while
calculating mode shapes.
From the Study
Properties dialog box, select Decouple the
mixed free body modes. In cases where mixed free body modes exist in a
model, the algorithm resolves the mixed motion associated with a rigid body mode and
provides the precise mode shape of a rigid body mode.
The option to decouple the mixed free body modes is available in
Frequency, Linear Dynamic, Harmonic, Random Vibration, and Response Spectrum Analysis
studies.