Kobe Steel, Ltd.

Tsuyoshi Ashida

Eiji Takahashi

Kaname Araki

Shugo Takaki

Yasuharu Matsumoto

A rotating machine abnormality diagnosing apparatus for diagnosing an abnormality in a rotating machine includes: an analyzing part which performs a time-frequency analysis to a signal S representing intensity and time relationship of an elastic wave generating in the rotating machine; an extracting part which extracts second data representing intensity and time relationship of a predetermined frequency component from first data obtained by the time-frequency analysis; and a determining part which determines that a first rotor and a second rotor are in contact with each other when the second data contains intensity variation having a cycle represented by Tb=Ta, in which a rotational cycle of the first rotor is denoted by T, a rotational cycle of the second rotor is denoted by T, and a ratio of a number of protrusions to a number of recesses is denoted by a:b.

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Kobe, Japan

Tsuyoshi Ashida