MEFFMASS

I/O Options EntryUsed to request output of modal effective mass, modal participation factors, Modal effective mass fractions in normal modes analysis subcases.

Format

MEFFMASS (format, GRID=gid, output) = option

Example

MEFFMASS(ALL)=YES

Definition

Argument Options Description
format <PUNCH, NOPUNCH, blank>
PUNCH
MEFFMASS output is printed to the PUNCH file and the .out file.
PUNCH file output is only activated if OUTPUT,PUNCH is additionally specified. See Comment 4 for output printed to the Punch file.
NOPUNCH
MEFFMASS output is not printed to the PUNCH file, and is only printed to the .out file.
Blank (Default)
MEFFMASS output is printed to the .out file only.
gid <Grid ID>
Grid ID
Grid point identification number of a grid at which the corresponding MEFFMASS output is printed.
Blank (Default)
MEFFMASS output is printed for the full model.
output <SUMMARY, PARTFAC, MEFFM, MEFFW, FRACSUM, ALL> Requests output of:
SUMMARY (Default)
Modal Effective Mass matrix, Modal Effective Mass Fraction, and the Rigid Body Mass matrix.
PARTFAC
Modal Participation Factors.
MEFFM
Modal Effective Mass matrix in units of Mass.
MEFFW
Modal Effective Mass matrix in units of Weight.
In addition, Modal Effective Mass matrix in units of Mass is also printed.
FRACSUM
Modal Effective Mass fraction.
ALL
All matrices are output. They are: Rigid Body Mass Matrix, Modal Participation Factors, Modal Participation Factor Ratios, Modal Effective Mass, Modal Effective Mass (in Weight units), and Modal Effective Mass Fraction matrices.
option <YES,NO>

Default = YES
YES or blank
Matrix Output is printed based on the options specified.
NO
Matrix Output is not printed.

Comments

  1. Output from MEFFMASS is only supported for Normal Modes Analysis.
  2. PARAM,EFFMASS,YES is also available for similar output of the specified matrices above for Normal Modes Analysis. PARAM,EFFMAS,YES does not provide output of Rigid Body Mass Matrix, Modal Effective Mass Matrix in Weight units, or Grid-based selection.
  3. When compared to PARAM,EFFMASS,YES, the MEFFMASS I/O Entry provides additional control over the normal modes analysis mass output, and can be used in place of PARAM,EFFMAS,YES if the output is to be fine-tuned or if these matrices are to be output only for particular grids.
  4. If OUTPUT,PUNCH is also specified along with MEFFMASS, then the Modal Participation Factors, Modal Participation Factor Ratios, and the Modal Effective Mass matrices are printed to the Punch file.
  5. For the MEFFW option, the modal effective mass is divided by PARAM,WTMASS.
  6. For detailed information regarding how the matrices are calculated, refer to PARAM, EFFMAS.