公开(公告)号：US10830637B2

公开(公告)日：2020-11-10

申请号：US15746740

申请日：2016-06-27

Applicant: NTN CORPORATION

Inventor： Hiroshi Ikeda ,  Toru Takahashi

IPC: G01H1/00 ,  G01M99/00 ,  G01M15/14 ,  F03D17/00

Abstract: 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.