MODCONT, MLSkey, EnforcedKey
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. |
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, the
/CONFIG command with Lab = NUMLV can be
used.
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 QR damped modal methods.
The enforced motion calculation (EnforcedKey = ON) is supported by the Block Lanczos
and Supernode mode extraction methods.