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The NASTRAN Door reads and checks model files compatible to NASTRAN and translates these input files directly into internal PERMAS data structures.

The main capabilities of the NASTRAN-Door are:

  • All Bulk Data formats are supported: Small Field, Large Field and Free Field (with all possibilities for card generation).
  • Executive and Case Control sections are translated as well as all global usable statements.
  • PERMAS Components and Situations are built according to the Bulk Data model and the selections made by physical Case Control requests.
  • Take-over of NASTRAN identifiers, e.g. element-, node- and set-IDs survive the interfacing process and will be taken as PERMAS identifiers.
  • Automatic label generation with labels compatible to those generated by NASTRAN.
  • Fast Bulk Data sorting with machine independent sort sequence.
  • NASTRAN-like echo of input statements.
  • Extensive error tests are performed:
    • All public NASTRAN statements are recognized and analyzed lexically.
    • All supported statements are completely checked for wrong, missing or contradictory arguments.
  • Additional features:
    • Calculated results may be referenced under Subcase- or Load-ID.
    • Free Field comments within Fix Field statements.
    • the INCLUDE statement supports multiple file levels.

A remarkable specialty of the NASTRAN-Door is the ability to utilize the given control data as well:

UCI trigger for NASTRAN-Task

Control input such as solution-ID, output requests and method selections are converted into task control structures, equivalent to those made by explicit UCI input (User Control Interface).

This so-called NASTRAN Task may be started by one special UCI statement.

To execute a NASTRAN-compatible run, only 4 PERMAS UCI-commands are necessary (see figure). Using this simple UCI input, NASTRAN decks can be executed without the necessity of any additional input.

Additional features of this NASTRAN Task are:

  • Automatic re-translation of its internal task definitions into plain UCI commands echoed to the user.
  • The user can choose between the automatic solution control (read from the given NASTRAN model file) and an explicit UCI control.
  • The user can extend the NASTRAN Task by additional UCI statements.
  • NASTRAN subcases may be selected and executed individually, leaving all remaining subcases untouched.
  • the following solutions are supported:
    • Linear Static,
    • Normal Modes Analysis,
    • Direct Frequency Response,
    • Direct Transient Response,
    • Modal Frequency Response and
    • Modal Transient Response.
  • Supported parameters, which affect the control flow, are also evaluated.

Finally the application of the NASTRAN Task is not restricted to pure NASTRAN-Door input. Even if model additions were made by other input Doors (e.g. DAT file input) - the user is free to execute his/her NASTRAN control data, automatically.