User login

Navigation

What we talked about

You are here

Home » Blogs » L2020's blog

Subspace Mode Extraction Method@ANSYS

L2020's picture
Sun, 2007-12-16 03:37 - L2020
ANSYS Subspace Mode Extraction

Hi
I've a question about the Subspace method as one of the mode extraction methods of ANSYS.I want to extract the first 100 modes of a system with more than 200 DOFs, 
I assigned "No. mode to extract" to 100.
but when I ran the analysis, ANSYS just calculated the first 75 modes of the system...
I checked out the Subspace options again and I saw "No. mode to extract" was assigned to 75!!!!, I don't know why this option has changed??!

any help is appreciated
Regards

 

»

Comments

Ying Li's picture

Submitted by Ying Li on Mon, 2007-12-17 01:17.

Dear  Laleh,

Sometimes, the subspace method may not used for the large modes you want to track in ANSYS. Try the  Block Lanczos method, which could be used for the large modes tracking. 

Ying Li

Department of Engineering Mechanics Tsinghua University Beijing, 100084, P. R. CHINA

»
L2020's picture

Submitted by L2020 on Wed, 2007-12-19 08:32.

Thanks for the guidance...I used Block Lanczos method...and fortunately my problem was solved... 

Regards

Laleh
http://laleh.fatahi.googlepages.com

»
Subscribe to Comments for "Subspace Mode Extraction Method@ANSYS"

Recent comments

More comments

Syndicate

Subscribe to Syndicate