This option is used to perform eigenvalue extraction to calculate the complex eigenvalues and corresponding complex mode shapes of a system.
Product: ABAQUS/Standard
Type: History data
Level: Step
Set FRICTION DAMPING=NO (default) to ignore friction-induced damping effects.
Set FRICTION DAMPING=YES to include friction-induced damping effects.
Set this parameter equal to the frequency at which to evaluate frequency-dependent properties for viscoelasticity, springs, and dashpots during complex eigenvalue extraction. If this parameter is omitted, ABAQUS/Standard will evaluate the material properties associated with frequency-dependent springs and dashpots at zero frequency and will not consider the contributions from frequency-domain viscoelasticity in the *COMPLEX FREQUENCY step.
First (and only) line:
Number of complex eigenmodes to be extracted. If this entry is omitted, all the eigenmodes available in the projected subspace, formulated on the basis of all eigenmodes computed in the preceding *FREQUENCY step and possibly reduced by using the *SELECT EIGENMODES option, will be extracted.
Minimum frequency of interest, in cycles per time. If this field is left blank, no minimum is set.
Maximum frequency of interest, in cycles per time. If this field is left blank, no maximum is set.
Shift point (positive or negative), in cycles per time. The eigenvalues with the imaginary part closest to this point will be extracted. The default value is zero.