|Jul21-09, 06:24 PM||#1|
Torsional Pendulum, Logarithmic Decrement
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.
Is this simply ln(100/13)= 2.04
or ln(13/100)= -2.04?
|Jul22-09, 06:18 AM||#2|
where n is the number of cycles, xo is the initial amplitude and xn is the amplitude after n cycles.
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