10 −4 10 −2 10 0 10 2 10 4 33.4 33.6 33.8 34 34.2 34.4 34.6 34.8 35 100 102 33.5339 33.534 33.5341 33.5342 33.5343 33.5344 Energy (log scale) Frequency (Hz) a b (a) (b) tongue9:1 Figure 11: FEP of the second (anti-symmetric) wing torsional NNM of the Paris aircraft. NNM shapes at energy levels marked in the FEP are inset; they are given in terms of the initial displacements (m) that realize the periodic motion (with zero initial velocities assumed). 239
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