SEOPT

SEOPT

SEOPT, Sename, SEMATR, SEPR, SESST, ExpMth, SeOcLvL
Specifies substructure analysis options.

SOLUTION: Analysis Options

Sename

The name (case-sensitive, thirty-two character maximum) assigned to the superelement matrix file. The matrix file will be named Sename.SUB. This field defaults to Fname on the /FILNAME command.

SEMATR

Matrix generation key:

1	—	Generate stiffness (or conductivity) matrix (default).
2	—	Generate stiffness and mass (or conductivity and specific heat) matrices.
3	—	Generate stiffness, mass and damping matrices.

SEPR

Print key:

0	—	Do not print superelement matrices or load vectors.
1	—	Print both load vectors and superelement matrices.
2	—	Print load vectors but not matrices.

SESST

Stress stiffening key:

0	—	Do not save space for stress stiffening in a later run.
1	—	Save space for the stress stiffening matrix (calculated in a subsequent generation run after the expansion pass).

ExpMth

Expansion method for expansion pass:

BACKSUB	—	Save necessary factorized matrix files for backsubstitution during subsequent expansion passes (default). This normally results in a large usage of disk space
RESOLVE	—	Do not save factorized matrix files. Global stiffness matrix will be reformed during expansion pass. This option provides an effective way to save disk space usage. This option cannot be used if the use pass uses large deflections (NLGEOM,ON).
NONE	—	Do not save factorized matrix files. With this option, the expansion pass is not possible when factorized matrix files are required.

SeOcLvL

For the added-mass calculation, the ocean level to use when ocean waves (OCTYPE,,WAVE) are present:

ATP	—	The ocean level at this point in time (default).
MSL	—	The mean ocean level.

Notes

The SEOPT command specifies substructure analysis options (ANTYPE,SUBSTR). If used during solution, the command is valid only within the first load step.

When ocean waves (OCTYPE,,WAVE) are present, the SeOcLvL argument specifies the ocean height or level to use for the added-mass calculation, as the use-run analysis type is unknown during the generation run.

The expansion pass method RESOLVE is not supported with component mode synthesis analysis (CMSOPT). ExpMth is automatically set to BACKSUB for CMS analysis. The RESOLVE method invalidates the use of the NUMEXP command. The RESOLVE method does not allow the restarting of the substructure generation pass and the computation of results based on nodal velocity and nodal acceleration (damping force, inertial force, kinetic energy, etc.) in the substructure expansion pass.

If ExpMth is set to NONE, neither the restarting of the generation pass, nor the expansion pass is possible for substructure analysis and component mode synthesis analysis (CMSOPT) using fixed-interface (CMSOPT,FIX) or free-interface (CMSOPT,FREE) methods. For component mode synthesis analysis using fixed-interface method (CMSOPT,FIX), the expansion pass is possible when element results calculation is activated in the generation pass (ELCALC = YES on CMSOPT). The ExpMth argument is not required for component mode synthesis analysis using the residual-flexible free-interface method (CMSOPT,RFFB).

This command is also valid in PREP7.

Menu Paths

Main Menu>Preprocessor>Loads>Analysis Type>Analysis Options

Main Menu>Solution>Analysis Type>Analysis Options