10 −4 10 −3 10 −2 10 −1 10 0 8 8.05 8.1 8.15 8.2 8.25 8.3 Energy (log scale) Frequency (Hz) a b (a) (b) Figure 9: FEP of the first wing bending 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). 237
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