consistent increase in natural frequency (due to the hardening stiffness). On the other hand, the damping is rather linear. (a) (b) Fig.4: CONCERTO’s analysis of both FRF and transmissibility of a system with linear damping and hardening cubic spring: (a) natural frequency and (b) damping as functions of the mount displacement amplitude 00.511.522.5 33.5 4 x 10 -3 10.05 10.06 10.07 10.08 10.09 10.1 10.11 10.12 10.13 10.14 Hardening Cubic Stiffness Displacement [m] Natural Frequency [Hz] 0.1 N 0.2 N 1.5e-2 mm 2e-2 mm 4e-2 mm 0 0.5 1 1.5 2 2.5 3 3.5 4 x 10 -3 0.25 0.3 0.35 0.4 0.45 0.5 Displacement [m] damping ratio [%] 0.1 N 0.2 N 1.5e-2 mm 2e-2 mm 4e-2 mm Effective deformation [m] Effective deformation [m] 486
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