engineering recuitment AAI JE Technical Mock Test 2020-21 Mechanical Vibrations Damped Free Vibration Logarithmic Decrement
In an underdamped vibration system, logarithmic decrement is given by:
1
\( \frac{{2\pi \xi }}{{\sqrt {1 - {\xi ^2}} \;}}\)
2
\( \frac{{2\pi \xi^2 }}{{\sqrt {1 - {\xi ^2}} \;}}\)
3
\( \frac{{2\pi \xi }}{{\sqrt {1 + {\xi ^2}} \;}}\)
4
\( \frac{{2\pi \xi }}{{\sqrt {1 - {\xi }} \;}}\)