Mechanical Engineering - Theory of machines - Discussion

25. 

In under damped vibrating system, the amplitude of vibration

[A]. decreases linearly with time
[B]. increases linearly with time
[C]. decreases exponentially with time
[D]. increases exponentially with time

Answer: Option C

Explanation:

No answer description available for this question.

Ankit Agarwal said: (Aug 14, 2015)  
I think there is no answer in the question because in case of under damping the amplitude of vibration varies according to sin graph.

Naga Sudheer said: (Sep 27, 2015)  
For an under-damped system, the value of ζ can be found by examining the logarithm of the ratio of succeeding amplitudes of a system. This is called the logarithmic decrements.

Amal said: (Jan 10, 2016)  
Yep, I agree with @Ankit. The amplitude varies sinusoidally.

Manish Katekar said: (Jan 9, 2020)  
Amplitude varies as per sine graph but it decreases exponentially.

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