Harmonic of the rotational speed of rotating machinery. As an example, in the case of the shaft rotating at 6,000 rpm, the first order component occurs at a frequency of 100 Hz (6,000/60), whereas the third order component would occur at a frequency of 300 Hz.

f = frequency [Hz]
n = order
N = rotational speed [rpm]

See also: Order Analysis, Order Tracking.

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Subjects: Noise & Vibration