A. Culla, W. D’Ambrogio, A. Fregolent and A. Schiavone Table 3 Theoretical and experimental natural frequencies Systems fmodel [Hz] fexp [Hz] Δf [%] f1 4.016 3.861 3.86 A f2 6.912 6.787 1.81 f3 11.360 11.330 0.26 f1 3.612 3.705 -2.57 B f2 6.538 6.445 1.42 f3 14.260 11.860 16.83 f1 3.892 3.985 -2.39 AB f2 6.663 6.476 2.81 f3 10.240 10.900 -6.45 f4 12.700 12.330 2.91 3.3 Results for subsystem addition Starting from the FRFs of subsystems AandBafter spring cancellation, the FRFs of the coupled system is computed using the procedure outlined in Section 2.1. Results at the coupling DoFs are shown in Figs. 15 and 16. The first two natural frequencies are satisfactorily located. The errors in the third and fourth natural frequencies are probably due to inaccuracies in the identification of the subsystemB(see Table 3). Fig. 15 Inertance H22 of the coupled system: fitted (blue); from coupling (red) 0 5 10 15 10−2 10−1 100 101 102 Frequency [Hz] Magnitude [m s−2/N] Fig. 16 Inertance H33 of the coupled system: fitted (blue); from coupling (red) 0 5 10 15 10−2 10−1 100 101 102 Frequency [Hz] Magnitude [m s−2/N] 102
RkJQdWJsaXNoZXIy MTMzNzEzMQ==