Question: The following data were taken by driving a machine on its support with a rotating unbalance force at various frequencies. The machine's mass is 50

The following data were taken by driving a machine on its support with a rotating unbalance force at various frequencies. The machine's mass is 50 kg, but the stiffness and damping in the support are unknown. The frequency of the driving force is f Hz. The measured steady-state displacement of the machine is |x| mm. Estimate the stiffness and damping in the support.

f (Hz 0.2 (mm) f (Hz)r (mm) 3.8 26 16 14 12 12 12 10 2.6 2.8 24 36 50 36 30 3.4 3.6 10

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