A. Culla, W. D’Ambrogio, A. Fregolent and A. Schiavone can be compared with the previous results (Figs. 17 and 18): it is clear that the natural frequency around 5 Hz is not consistent with the model. Fig. 19 Inertance H22 of the coupled system changing the fitting poles: measured raw (blue) and fitted (red) 0 5 10 15 10−2 100 102 Frequency [Hz] Magnitude [(m/s2)/N ] 0 5 10 15 −15 −10 −5 0 Frequency [Hz] Phase [rad] Fig. 20 Inertance H33 of the coupled system changing the fitting poles: measured raw (blue) and fitted (red) 0 5 10 15 10−2 100 102 Frequency [Hz] Magnitude [(m/s2)/N ] 0 5 10 15 −15 −10 −5 0 Frequency [Hz] Phase [rad] 104
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