13. Consider steady-state vibration of a friction- free spring-mass-damper system subjected to harmonic applied force. The normalized...

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13. Consider steady-state vibration of a friction-

free spring-mass-damper system subjected to harmonic applied force.

The normalized amplitude of the mass is given by:

where is the frequency ratio, and is the damping ratio. Make a 3-D plot (shown) of the normalized amplitude

(z axis) as a function of the frequency ratio for , and a function of the damping ratio for

.

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