Contact US

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!

*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

Generalized Aerodynamic Force Matrix extraction

Generalized Aerodynamic Force Matrix extraction

Generalized Aerodynamic Force Matrix extraction

Hello all,

Anyone knows how to extract the Generalized Aerodynamic Force matrix (QHH) of flexible modes from the nastran database? I am currently doing a SOL 145

Thank you,
Jose Daniel

RE: Generalized Aerodynamic Force Matrix extraction

Which Nastran version are you using?

RE: Generalized Aerodynamic Force Matrix extraction

I am using the 2014 version

RE: Generalized Aerodynamic Force Matrix extraction

There are examples of how to obtain this output in the "tpl" (test problem library) directory. Look at (for example) example ha145i, which contain a small DMAP alter to print the QHHL matrix. Starting with version 2014, the tpl examples are delivered with the documentation on a separate install executable (e.g. nastran_2014.1_windows_doc_example.exe for Windows). In prior versions, the tpl was delivered with the product installer. You will need to get at the tpl examples.

Be careful with the above output; I am not completely sure if QHHL is the right output for you; you may need to do some manipulation. If the terms of QHHL do not look like the numbers you are expecting, try browsing the content of the MSC Nastran Aeroelastic forum of the MSC Software VPD forum, at http://forums.mscsoftware.com/news/ubbthreads.php. Others have requested this output in the past. If you don't see what you need over there, you can always post a request to that forum; there are MSC staff as well as clients who participate in the forums.

RE: Generalized Aerodynamic Force Matrix extraction

Thank you very much, I'll try with the DMAP alter although it will be the first time I use them.

Whenever I have a solution I will post it here for future forum users.

The code line I'll be using first is (to make it easy for future forum users):

ALTER 50 $ V3

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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