Page 15 - Vibrations-2

These may arise from

• imbalance

• misalignment

• gear mesh

• bearing defects.

Order analysis is specifically for rotating machinery.

Looking how frequencies change as the rotational speed

of the machine changes.

It resamples raw signals from the time domain into the

angular domain, aligning the signal with the angular

position of the machine.

There are two large peaks in this power spectrum.

The first peak at 60 Hz corresponds to the shaft rotational

speed of a machine.

th
The second peak, which is the 4 harmonic of the

rotational speed, corresponds to the bearings of the

machine.

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