Adams Advanced Package > Adams Durability > Dialog Box - F1 Help > Nastran Modal Export Dialog Box

Nastran Modal Export Dialog Box

Durability -> FE Modal Export -> Nastran
Creates an .mdf file that can be referenced in a NASTRAN DMAP to recover dynamic stresses of the flexible component in NASTRAN.
Learn about Exporting Data for NASTRAN.
 
For the option:
Do the following:
Flexible Body
Enter the name of the flexible body you want to analyze.
Output File
Enter the name of the output file you want to create.
Note: The file extension must be .mdf.
(Export Option)
Select one of the following:
■Modal Coordinates: The modal coordinates are the modal response of the flexible part per time step.
■Unit Matrix: The Unit Matrix contains just the normalized unit deformations of the mode shapes. This option allows you to apply the normalized unit deformations of the mode shapes to your NASTRAN bulk data file, run a stress analysis in NASTRAN, and then view the stress modes of the flexible part in Patran. This is a good debugging exercise to ensure that your stress modes make physical sense.
If you select Modal Coordinates, Adams Durability displays the following options:
Analysis
Enter the name of a previously run analysis.
Output Time Start/End
Specify the starting and ending time of the analysis you want to export. If you do not specify a range, Adams Durability exports the entire analysis.
Skip
Enter the number of steps you want to skip.
Remove 1G deformation
Select if you want to subtract static deformation from the transient results. If selected, Adams Durability removes the static component from the dynamic stresses recovered in Nastran.
Include Modal Velocities
Select to include modal velocities along with modal deformations in the .mdf file. If not selected, only the modal deformations are included in the .mdf file.