In the case of two turbine aircraft engines that are rotating at nearly the same frequency but not precisely at the same frequency, four frequencies are generated. These are: (f1) the rotational frequency of turbine one, (f2) the rotational frequency of turbine two, (f1 + f2) the sum of turbine rotational frequencies one and two, and (f1 - f1) which is the difference or "beat" frequency of turbines one and two. The difference of the two frequencies is the lower frequency and is the one that is "felt" as a beat or "wow" in this case.
Related categories WAVES AND WAVE PHENOMENA
ACOUSTICS AND MUSIC
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