'nan' result in eigen analysis

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Micro1
Posts: 1
Joined: Wed Feb 01, 2023 2:57 pm

'nan' result in eigen analysis

Post by Micro1 » Wed Feb 01, 2023 3:17 pm

Dear STKO team and other users:
I am a STKO beginner and am currently learning to use STKO for modeling and analysis.
I have a problem when learning the eigenvalue analysis, and the calculated eigenvalue result of the model is NaN.
I found in the forum that some STKO users have encountered this problem, and this problem is usually because the model structure is singular. I checked my model (to be honest, this model is very simple), but I still do not solve the problems, can anyone help me? Thanks very much.
The model and the error information was attached.
de77d3856a81adf2cfdab8cf9812c15.png
de77d3856a81adf2cfdab8cf9812c15.png (178.38 KiB) Viewed 1271 times
1158dd0ec65db0eebf2e00c14bffe9d.png
1158dd0ec65db0eebf2e00c14bffe9d.png (18.52 KiB) Viewed 1283 times
Attachments
TEST.rar
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STKO Team
Posts: 3066
Joined: Tue Oct 29, 2019 8:45 am

Re: 'nan' result in eigen analysis

Post by STKO Team » Wed Feb 15, 2023 2:50 pm

Mass should be positive

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