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Topic: Convergence of the first eigenvalue of a system
Replies: 1   Last Post: Nov 26, 2013 12:17 PM

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Al Sam

Posts: 1
Registered: 11/25/13
Convergence of the first eigenvalue of a system
Posted: Nov 25, 2013 2:25 PM
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Hi all

I had a code in Matlab, and I used it to obtain the eigenvalues of a cantilever beam with variable number of divisions to see the convergence of the eigenvalues to the analytical values. In an older version (2004 I guess) it was OK and I could see convergence. Recently I ran it on the new 2013b and what I get is noticeable oscilations in the first eigenvalue when I increase the number of beam divisions. I think my code is OK, because I can run it on the old version, but I am not sure what is wrong that the new matlab that cannot solve this problem correcly. By increased I mean 200 to 300 elements, which results in a 200*200 or 300*300 matrix. I can put my code here for those who are intrested. Is there something wrong with the newer eigenvalue solvers of Matlab? I run Matlab 2013b on linux redhat.

Thanks in advance

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