Title:
ABNORMALITY DIAGNOSTIC METHOD AND DEVICE OF EXTREMELY LOW SPEED ROTARY MACHINE
Document Type and Number:
WIPO Patent Application WO/2008/117765
Kind Code:
A1
Abstract:
Inexpensive method and device for diagnosing abnormality of an extremely low speed rotary bearing of 10 rpm or less with high precision using an acoustic signal. An acoustic signal generated from the rolling bearing of an extremely low speed rotary machine of 10 rpm or less is detected using a detection end having a sound collection function of 10 kHz or less, spectral distribution is determined by frequency analysis, the spectral average value or effective value of a frequency analysis waveform obtained by processing the spectral distribution at a frequency not lower than the natural frequency of the bearing is compared with a reference value, and a judgment is made that the bearing is abnormal if the spectral average value or effective value exceeds the reference value.
Inventors:
MURAYAMA TSUNEMI (JP)
Application Number:
PCT/JP2008/055351
Publication Date:
October 02, 2008
Filing Date:
March 17, 2008
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
MURAYAMA TSUNEMI (JP)
MURAYAMA TSUNEMI (JP)
International Classes:
G01M13/04; G01H17/00
Foreign References:
| JPH11271181A | 1999-10-05 | |||
| JP2005300517A | 2005-10-27 | |||
| JPH03245054A | 1991-10-31 | |||
| JPH07270228A | 1995-10-20 | |||
| JPH10160638A | 1998-06-19 |
Other References:
INOUE M.: "Teisoku Kaiten Kikai Shindan no Genjo Kyokuteisoku Kaiten no Jikuuke Shindan (the 1st part)", PLANT ENGINEER, JAPAN INSTITUTE OF PLANT MAINTENANCE, vol. 34, no. 9, 27 August 2002 (2002-08-27), pages 37 - 41, XP008117665
See also references of EP 2131177A4
See also references of EP 2131177A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chome, Minato-ku, Tokyo 23, JP)
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