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Ron, Yes I realize any pump will generate lots of harmonics...any advice on how to reduce their amplitudes (other than reducing the pump pressure pulsation amplitude)? Thanks!

Thanks We'll look at those things

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...