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Mechanical Vibration Analysis

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I have a mass-spring-damper system that is tested to determine the value of the viscous damping coefficient c. Assume k=10lb/ft and m=2 slug. The vibrational amplitude is observed to decrease to 33% of its initial value after two consecutive cycles.
How do I deduce the value of the logarithmic decrement?
How do I deduce the value of the viscous damping factor?
How do I deduce the value of the viscous damping coefficient c?

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The solution answers detailed questions analyzing mechanical vibration.

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