Frequency response function help In the following figures in

Frequency response function help.

In the following figures indicate which plot correctly represents the Frequency Response Function, |H(w)|, For a SDOF system under a harmonic input r why (no rotating unbalance in the system). System is damped

Solution

Answer C

1.Well before resonance, the force and displacement response are approximately in-phase i.e. the response follows the excitation with a small delay indicated by the phase angle

2. Hence there is a significant amplification of the response at the resonance ( r = 1).

3. Damping affects the response only for excitation frequencies relatively close to the resonance.