Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

NX NASTRAN bulk data format

NX NASTRAN bulk data format

NX NASTRAN bulk data format


I'm trying to understand why NX.NASTRAN makes an exception of allowing an integer in the field which only accepts real numbers?

As an example, I've been fiddling around with the 'instest.dat' test file that comes along with the nastran deliverable (located at: X:\Program Files\Siemens\FEMAPv1200\nastran\nxn12p02\nast). If all the X,Y and Z co-ordinates of the GRID entries are converted to integers the model still runs without FATAL'ing out. This is surprising to me as other flavors of NASTRAN which I'm very familiar with would not allow this. The complete f06 with the unsorted and sorted bulk data echo is attached to this post. (See attached: instest.f06)

Can someone explain this or am I missing something very obvious and particular to NX.NASTRAN?

I'm using NX.NASTRAN v12.2 on windows 10 64-bit OS.


RE: NX NASTRAN bulk data format

I don't know much about NX, but even the more recent versions of MSC Nastran (since 2013, I believe) add a subroutine that converts these integers to reals before running as a "convenience". Personally, I always shut this functionality off in MSC Nastran by adding the keyword 'ifpstar=no', don't know if you can do something similar in NX.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close