Fig. 5. Academic example illustrating the limitation of the SA when applied to a single dof system excited by a linear chirp. (a) Reference instantaneous frequency, (b) constant amplitude linear chirp synchronous with the 15th order of the reference instantaneous frequency, (c) amplitude and (d) phase spectrum of the single dof linear system, (e) angular resampled response, (f) response order spectrum, (g) SA, (h) SA order spectrum, (i) residual signal, and (j) residue order spectrum. Note that the SA energy comprises only 13.94% of the response energy.
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