Importance

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Abstract

This vibration monitoring device comprises: a rotation sensor for outputting a rotation signal synchronized to rotation of a rotating shaft; a cut rotation signal generating unit for generating a cut rotation signal when the rotation signal is output from the rotating sensor, by replacing a part of the rotation signal equal to or greater than a predetermined limit value with the limit value, and leaving as the rotation signal, without modification, parts of the rotation signal that are less than the limit value; an offset rotation signal generating unit for generating an offset rotation signal obtained by offsetting the cut rotation signal to approach the limit value; and a first filter for extracting, from within the offset rotation signal, a signal in a passband set on the basis of a rotational speed of the rotating shaft, as a vibration signal enabling vibration information of the rotating shaft to be acquired.

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First Claim