Why vibration level reduce under certain defect condition but are higher in healthy state of the machine?

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Emir Nezirić

What machine fault was introduced?

Some machine faults could behave like that it is not allowing the shaft to move and could reduce max amplitude of the vibrations.

What are the values of the RMS of velocity for this measurements?

Syed Shaul Hameed

Gear defect fault were introduced

Please, could you share some pictures of your experiment and describe exact steps in your measurements (healthy machine and faulty machine). It would be helpfull.