Jul21-09, 06:33 PM
1. The problem statement, all variables and given/known data
The amplitude of a torsional vibration decreases so that the amplitude on the 100th cycle is 13% of the the amplitude of the first cycle. Determine the level of damping in terms of the logarithmic decrement.
2. Relevant equations
3. The attempt at a solution
Is this simply ln(100/13)= 2.04
or ln(13/100)= -2.04?
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