The plots in Fig. 5(a,b) are the results of the analysis of the FRF and transmissibility properties of a system with Coulomb damping. The constant natural frequency, Fig. 5 (a), is indicative of a linear stiffness element, whilst the decrease in damping with amplitude with hyperbolic trend is typical of Coulomb damping. (a) (b) Fig. 5: CONCERTO’s analysis of both FRF and transmissibility of a system with Coulomb damping : (a) natural frequency and (b) damping as functions of the response displacement amplitude 0 0.2 0.4 0.6 0.8 1 9.8 9.9 10 10.1 10.2 Coulomb friction Displacement [mm] Natural Frequency [Hz] 10N 20N 50N 1mm 2.5mm 5mm 0 0.2 0.4 0.6 0.8 1 0.4 0.6 0.8 1 1.2 1.4 Displacement [mm] damping ratio [%] 10N 20N 50N 1mm 2.5mm 5mm Effective deformation [m] Effective deformation [m] 487
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