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  1. TrannyNoise

    Gerotor Pump Harmonics

    I'm looking for insight into causes of higher order harmonics in the noise (and vibration) of a gerotor oil pump. The inner gear has 9 teeth, so the fundamental pump frequency is too low to be an issue at the operating speed; but the 3rd, 4th, and 5th harmonics create an issue. The 3rd harmonic...

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