The latter can be elucidated by the following 3-DOF example. Λ m = ω m 2 = u m T K u m u m T M u m equal to the static displacement from an applied force that has the same relative distribution of the diagonal mass matrix terms. *INFO in complexfreq: if there are problems reading the. Number of nonzero lower triangular matrix elementsĬomposing the complex eigenmodes from the real eigenmodes I.e., a numerical eigenvector solver could come up with any pair of linear independent vectors in that 2-dimensional space. The eigenvectors corresponding to the eigenvalue 4 are different because that eigenvalue has multiplicity2 and therefore its space of eigenvectors is two-dimensional. I used FLUTTER instead of CORIOLIS as it seemed appropriate for the case. But in that case, we have a rotating disc, whereas for the current problem we have a cantilever beam. From the CCX manual, section 5.3, we see the rotor problem with negative eigenvalues. (I know I don’t understand the functionality of a complex frequency card fully, but I tried to perform it just in case.
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