Bulk Data Entry Identifies the maximum frequency of a rigid body mode for the Lanczos eigensolver.

Parameter Values Description
FZERO <Real>

Default = 0.1

That is all eigenmodes with frequency at or below this cutoff will be regarded as rigid body modes in the inertia relief analysis.


  1. To set the rigid body mode cutoff eigenvalue for the AMSES and AMLS eigensolvers, use PARAM, RBMEIG.