turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Navigation
- Simcenter
- Forums
- Blogs
- Knowledge Bases

- Siemens PLM Community
- Simcenter
- 3D Simulation - NX Nastran Forum
- Not getting buckling shapes and mode factors

Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-26-2017 04:18 AM

Hi,

We are using NX10 for static and buckling analysis. During the simulation of buckling analysis we are not getting the buckling mode shapes and buckling factors.

This problem is arising for some particular models only. We dont know the reason why it is showing like this. In the analysis results it is showing the stress results only.

Kindly help us in solving the solution.

Labels:

7 REPLIES

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-26-2017 04:49 AM

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-26-2017 06:56 AM

Thanks for your response. For this what can i do now?

Whether i have to increase the mode numbers or some other?

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-26-2017 07:13 AM

I do not know anything about your model but you mentioned that your are getting the static solution, aren 't you?. And also in some models you are getting the buckling solution. That means that if the frecuency range of interest let's say is from 0 to 5

- some models the buckling occurs in this interval

- in the other no

. In the analysis settings you must be able to modify this. Are you not getting some warning saying that no buckling modes were found in the specfified range. Simply that means that you need higher loads to produce buckling

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-26-2017 07:29 AM

In my model i didnt set any frequency range. When i open the op2 file it is showing this error.

Finally, In the analysis settings if i change the no of desired modes to 50, will i get the buckling mode shapes and factors.

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-29-2017 02:28 AM

Myabe It could help. But the buckling analysis is like modal analysis. You usually specficied the range and the number of modes. If you specfied just the number it should calculate but it could take long time until the 50 are found.

what it is strange is that the f06 can not be opened becasue it is too large. Many singularities?

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-29-2017 03:14 AM

Karthikeyan_E,

I had a lot of problems with large F06 files, too.

Sometimes it depends on a really huge amount of grid point singularities if having solid elements. Every rotation degree of freedom is sigular and NX wants to tell you that and afterward it is suprresing the rotational DOFs.

In that special case you can switch off the "Grid Point singularity table" in Parameters with

PRGPST = NO

Additionally I use "Notepad++" for large Ascii files like F06.

Best wishes, Michael

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

05-29-2017 03:41 AM

You are right Midi1791.

Follow Siemens PLM Software

© 2018 Siemens Product Lifecycle Management Software Inc