In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Answer: Option C
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Damping ratio=40/420=0.095
Log.decrement=2x3.14x0.95/[squaroot of (1-square of damping ration)]
=0.6
Damping ratio=40/420=0.095
Log.decrement=2x3.14x0.95/[squaroot of (1-square of damping ration)]
=0.6