Ntn Corporation

Yosuke Suzuki

Toru Takahashi

Takashi Haseba

Wataru Hatakeyama

Makoto Miyazaki

A condition monitoring system includes a vibration sensor for measuring a vibration waveform of a bearing in a wind turbine generation apparatus and a data processor for diagnosing abnormality of the bearing. In the data processor, an evaluation value computing unit time-sequentially computes an evaluation value that characterizes an effective value of vibration waveform data output from the vibration sensor within a certain time. A diagnosis unit diagnoses abnormality of the bearing based on transition of temporal change of the evaluation value. The evaluation value computing unit computes the minimum value of the effective values of vibration waveform data within a certain time, as the evaluation value.

Condition monitoring system and wind turbine generation apparatus

A data processing device includes a peak detector that detects a peak from a frequency spectrum and a map generator that generates an abnormality map for the frequency spectrum. The abnormality map includes as abnormal components, a frequency of a detected peak of interest and a frequency of a peak that appears together with the peak of interest when the peak of interest is assumed as the peak originating from abnormality. The data processing device includes an abnormal peak extractor that extracts as an abnormal peak, a peak at a frequency that matches with any of the abnormal components included in the abnormality map and a first criterion value calculator that calculates a first criterion value representing occurrence of abnormality corresponding to the abnormality map based on a spectral density of the abnormal peak.

Condition monitoring apparatus, condition monitoring system, and condition monitoring method

A first vibration sensor measures vibration of a bearing. A second vibration sensor for measuring background noise received by the first vibration sensor is installed so as not to receive vibration of the bearing. A data acquisition device receives a first signal that is a measurement signal of the first vibration sensor and a second signal that is a measurement signal of the second vibration sensor and outputs a third signal obtained by subtracting the second signal from the first signal as data indicating vibration of the bearing.

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Kuwana, Japan

Yosuke Suzuki