10 −4 10 −3 10 −2 10 −1 10 0 10 1 21.1 21.12 21.14 21.16 21.18 21.2 21.22 21.24 21.26 21.28 21.3 Energy (log scale) Frequency (Hz) a b (a) (b) Figure 8: FEP of the first tail bending NNM of the Paris aircaft. 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). 236
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