SINGLE DEGREE OF FREEDOM SYSTEMS:

Free vibration:

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Damped vibration:

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Forced vibration

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Excitation:

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Vibration measuring instruments:

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So the natural frequency of instruments is low. Low natural frequency means heavy mass of the body of the instrument which makes it rare application in practice specially in systems which require much sophistication. The frequency range of a vibrometer depends upon several factors such as damping, its natural frequency etc. It may have natural frequency 1 Hz to 5 Hz.

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