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Full spectrum understanding the two forward and reverse rotations

thread384-431686

Full spectrum understanding the two forward and reverse rotations

Full spectrum understanding the two forward and reverse rotations

(OP)
Hi All

reading about application of full spectrum in rotary machine diagnostics, I have difficulty in understanding how a shaft rotating in one single direction and bi-directional vibration, that constitutes its full spectrum diaghram, can have a two contrasting rotations, forward and reverse with the same velocity and amplitude , that further can be filtered into 1X and 2X orbits that each consists one of those rotations ?

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