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Free damped and damped and undamped torsional vibration

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Free damped and damped and undamped torsional vibration
-to find the natural frequency,logarithmic decrement, and the ratio co-efficient of free damped and undamped vibration of a disc-shaft system.
-to find the natural frequency,logarithmic decrement, and the ratio co-efficient of free damped and undamped vibration of a disc-shaft system.