Ntn Corporation

Hiroshi Ikeda

Takashi Haseba

Toru Takahashi

Akitoshi Takeuchi

An abnormality diagnosis device, which is capable of detecting that a vibration sensor is detached from a measurement object, includes a vibration sensor and a control device. The vibration sensor is attached to a measurement object, and measures vibration of the measurement object. The control device determines whether or not the vibration sensor is detached from the measurement object, based on data received from the vibration sensor. The control device calculates a first partial overall value in a first frequency band. The control device calculates a second partial overall value in a second frequency band which is higher than the first frequency band. The control device calculates an index value having a correlation with a ratio between the first partial overall value and the second partial overall value. The control device determines whether or not the vibration sensor is detached from the measurement object, based on the index value.

Abnormality diagnosis device and sensor detachment detection method

A condition monitoring system that diagnoses an abnormality of an apparatus provided in a wind turbine includes a monitoring apparatus including a sensor provided for the apparatus, a monitoring-side control apparatus that sets a threshold value to be used by the monitoring apparatus for diagnosing the abnormality of the apparatus, and diagnoses the abnormality of the apparatus based on the threshold value, and a monitoring terminal that monitors a condition of the apparatus. The condition monitoring system can correctly diagnose an abnormality of the apparatus provided in the wind turbine.

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Mie, Japan

Hiroshi Ikeda