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

ANSYS Modal Export Dialog Box

Durability -> FE Modal Export -> ANSYS
Generates files you can use as input to a Modal Stress Recovery (MSR) analysis in ANSYS.
The component modal synthesis (CMS) method has the following scheme: the system DOF's are partitioned into boundary DOF and interior DOF. When outputting Modal Coordinates via Adams Durability, the modal displacements due to deformations induced by the corresponding CMS modes, which consist of both the boundary modes and the interior modes are exported.
The Mode Shape Transformation matrix is included in the MNF so that Adams can know how to transform the modal coordinates back to the unorthonormalized basis so that they can be applied to recover results such as stress or strain in the FEA program. If the FEA program performs the orthonormalization, then this transformation is an identity matrix. This is typical of an MNF generated by MSC.Nastran and recent versions* of ANSYS.
Older versions of ANSYS* and Adams AutoFlex (prior to Adams ViewFlex) required a Mode Shape Transformation block/matrix in the MNF file. This was used to transform the modal coordinates back to the same basis in which they were computed (that is, unorthonormalized) so that they are in consistent basis for data recovery. These older versions of ANSYS* required a macro** in ANSYS to compute the orthonormalized modes and write out the MNF file using these modes.
 
*Please consult your ANSYS documentation/support to identify whether you ANSYS version generates MNF files in orthonormalized or unorthonormalized basis.
**In order to perform a restart in very old versions of ANSYS, you would need certain macros to build an ANSCUST executable. The MSR macros and source code are found in the Adams release directory install_dir/durability/ANSYS (where install_dir is the directory where Adams is installed). Consult your ANSYS documentation for more information on building an ANSCUST executable.
Learn more about Exporting Data for ANSYS.
 
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 .out.
(Export Option)
Select if you want to export modal coordinates or mode shapes.
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.
Basis
Specify Orthonormalized or Unorthonormalized. If you don’t know the basis, select Unknown.
Note: It is important for modal superposition that the modal coordinates are in the same basis as the stress or strain modes. Which Basis Option Should I Use?
Format
Specify the type of output file you want to create:
■DAC: Adams Durability creates multiple output files.
■RPC III: Adams Durability creates one file
Include Modal Velocities
Select to include modal velocities along with modal deformations in the .out file. If not selected, only the modal deformations are included in the .out file.
If you select Mode Shapes, Adams Durability displays the following options:
Select Nodes
Select one of the following:
■All: Exports the complete set of nodes.
■From File: Exports a partial set based on a file. If selected, displays the Node List File text box where you can specify the name of the file that contains a list of specific nodes.
■From List: Exports a partial set based on individual nodes. If selected, displays the following additional text boxes:
■Node to Add to List: Enter the node you want to add.
■Node List: Displays the list of nodes as they are added.
■Write to File: If you want to write this information to a file, select this checkbox and then specify the name of the file to which you want the information saved.