MODCONT
MODCONT,
MLSkey, EnforcedKey,
--, FastLV
Specify additional modal analysis options.
MLSkeyMultiple load step key:
OFF
—
Perform the modal analysis (compute the eigenvalues and the load vector) for each load step. (default)
ON
—
Perform the modal analysis (compute the eigenvalues and the load vector) only for the first load step; form the load vector for each subsequent load step (without repeating the eigenvalue calculations) and write all load vectors to the Jobname.mode file for downstream mode-superposition analyses.
EnforcedKeyEnforced motion key:
OFF
—
Do not calculate enforced static modes. (default)
ON
—
Calculate enforced static modes and write them to the Jobname.mode file.
--Unused field
FastLVFast load vector generation key; valid only when
MLSkey= ON:OFF
—
Do not activate fast load vector generation (default).
ON
—
Activate fast load vector generation. This option is only supported when each load vector is based on a unique element surface load (SFE) applied on one element, and the element result superposition key is activated (
MSUPkey= YES on MXPAND).
Notes
Specifies additional modal analysis (ANTYPE,MODAL) options.
Use the LVSCALE command to apply the desired load in a mode-superposition transient or harmonic analysis.
When MSUPkey = YES on the MXPAND command, the
maximum number of load vectors allowed in the Jobname.mode file defaults
to 1000. To increase this limit, use the command /CONFIG,NUMLV. When
FastLV = ON, the limit is automatically set to 1x106
and cannot be changed.
The maximum number of load vectors that can be used in the downstream mode-superposition transient or harmonic analysis is the number of load vectors written in the Jobname.mode file.
Generation of multiple loads
(MLSkey = ON) is supported by the Block Lanczos, PCG Lanczos,
Supernode, Subspace, Unsymmetric, and QRDAMP mode extraction methods.
The enforced
motion calculation (EnforcedKey = ON) is supported by the
Block Lanczos, Supernode, Subspace, and QRDAMP mode extraction methods.