33 Studies of a Geometrical Nonlinear Friction Damped System Using NNMs 347 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.005 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 ln(Ekin) dN Fig. 33.5 Relationship between kinetic energy of the oscillation and the damping coefficient time / s frequenzy / Hz 0 100 200 300 400 500 600 700 800 900 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 Fig. 33.6 Wavelet analysis of the decay process with the identified sticking force fH,tot D 4.16N, initiated on isolated resonance forced by excitation amplitude of 1 N are sliding. The wavelet analysis is used in Fig. 33.6 to show that no frequency-energy dependence and no other spectral components are showing up. With the identified normal force FRFs are calculated with the MHBM at different excitation levels in Fig. 33.7. It can be seen that the damping arises with increasing amplitude but no declining or progressive bending of the resonance peak can be realized. This also shows the possibility to make the fundamental system frequency independent of the excitation amplitude or the energy.
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