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Torsional Pendulum, Logarithmic Decrement 
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#1
Jul2109, 06:24 PM

P: 18

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? 


#2
Jul2209, 06:18 AM

HW Helper
P: 4,433

where n is the number of cycles, x_{o} is the initial amplitude and x_{n} is the amplitude after n cycles. 


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