Title:
FAILURE INSPECTION DEVICE DEPENDING ON ABNORMAL NOISE
Document Type and Number:
Japanese Patent JP3966500
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To allow a device inspecting for a failure from a frequency component corresponding to a particular cause of the failure on a rotating part and a device inspecting for the failure with all the frequency components to set an appropriate threshold value and to clearly identify a non-defective article and a defective article.
SOLUTION: The frequency component of an abnormal noise occurred from an object 6 to be inspected depending on the particular cause of the failure is extracted from an output of a sensor 8 detecting the abnormal noise by a signal separating means 12 such as a wavelet conversion means. Using the ratio of a maximum value of the frequency component to an mean value, the ratio of the maximum value to an effective value and a square value of the ration of the maximum value to the effective value or the like as a determining signal and comparing with the threshold value statistically determined and set by a threshold setting means 14, determination is made if there is the particular cause of the failure. In case of using all the frequency components for inspecting for the failure, the determining signal is made by differentiating the output of the sensor 8.
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Inventors:
Nobuteru Shimizu
Application Number:
JP2002020281A
Publication Date:
August 29, 2007
Filing Date:
January 29, 2002
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
International Classes:
G01H17/00; G01M99/00; (IPC1-7): G01H17/00; G01M19/00
Domestic Patent References:
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Attorney, Agent or Firm:
Shogo Ehara
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane