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Re: Spectral Appearance of Offset Misalignment

From: Trimetric
Remote Name: 66.156.33.119

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I'm thinking it's like this. Imagine two shafts offset horizontally and transmitting power through a single, offset pin in the load shaft. As the shafts rotate, the force required for the motor to spin the load shaft will go up and down as the shafts rotate since the leverage distance (distance between the center of the motor shaft and pin) changes. Since you have only horizontal offset and not vertical, the motor shaft will be pushed alternately up and down but not side to side. Obviously few couplings consist of only one pin but regardless, rubber flex couplings are similar with more legs/pins resulting in vibration frequencies which are multiples of rotation freqs with displacements still 90 degs. offset from the direction of offset. Hope this helps and if any of you out there who are smarter than me find my analysis at fault, please tell me - Thanks - John McClanahan Trimetric Engineering

Last changed: October 16, 2007