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Order 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.
- where
- f = frequency [Hz]
- n = order
- N = rotational speed [rpm]
See also: Order Tracking.
  
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