Timeline for Computing real normal modes from complex eigenvectors
Current License: CC BY-SA 4.0
7 events
when toggle format | what | by | license | comment | |
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Sep 17, 2018 at 16:36 | comment | added | Msegade | @BillGreene But I want vibration modes that take damping into consideration. With traditional modes I get an eigenvector that I can represent (say for example (1, -1) in a 2DOF system. With complex eigenvectors it gives something like (1+2j, 0.5 -1j) which I cannot represent. I'm looking for a way to make sense of this eigenvectors by transforming them into real modes. | |
Sep 15, 2018 at 20:31 | answer | added | Chris | timeline score: 1 | |
Sep 13, 2018 at 18:59 | comment | added | Bill Greene | You can't "convert" complex eigenvectors to real. The eigenvectors are complex because you have damping in your model. If you want to calculate traditional vibration modes for this model, set the damping matrix to zero. | |
Sep 13, 2018 at 16:57 | comment | added | nicoguaro♦ | Even in the linear eigenvalue problem you (might) have complex eigenvectors. | |
Sep 13, 2018 at 16:24 | comment | added | Msegade | @nicoguaro Yes, but that gives complex eigenvectors, I'm talking of a way of transforming those into real ones. | |
Sep 13, 2018 at 14:49 | comment | added | nicoguaro♦ | "We can then take the first $n$ components of $z$ as the eigenvector $x$ of the original quadratic $Q ( λ )$" from Wikipedia | |
Sep 13, 2018 at 10:05 | history | asked | Msegade | CC BY-SA 4.0 |