Added new flutter solution as implemented by Rodden in Nastran #53
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same behaviour and same results
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the flutter matrix, which is wrong. Next, the AIC matrices are mirrored with respect to the real axis to allow negative reduced frequencies. With these two steps, my original PK implementation produces plausible results. The PK implementation following Rodden misses one conjugate complex pole and the mode tracking needs improvement.
values instead of the expected range of 0 to 1.0.
correlation criterion. Because the PCC works much better, I'm not yet sure if I should keep the MACXP...
Application of pole correlation criterion. This make tracking the complex conjugate poles much more robust.
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