Title:
BLADE ABNORMALITY DETECTING DEVICE, BLADE ABNORMALITY DETECTING SYSTEM, ROTARY MACHINE SYSTEM, AND BLADE ABNORMALITY DETECTING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/180764
Kind Code:
A1
Abstract:
The present invention has: a vibration acquisition unit (52) which acquires the vibration of a steam turbine along with the rotation speed of a rotor when the rotation speed of the rotor changes; a frequency analysis unit which performs a frequency analysis on the basis of the result acquired from the vibration acquisition unit (52), and acquires the natural frequency at each of the respective rotation speeds of rotor blade rows; a contact rotation speed acquisition unit (54) which acquires, on the basis of the analysis result from the frequency analysis unit, a contact rotation speed that serves as a boundary between a state in which shrouds of neighboring rotor blades contact each other and a state in which the shrouds are spaced apart from each other; and a determination unit (55) which determines whether or not the rotor blade rows are abnormal, on the basis of the contact rotation speed acquired from the contact rotation speed acquisition unit (54).
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Inventors:
SABURI SATOSHI (JP)
NAKANIWA AKIHIRO (JP)
SATO TAKASHI (JP)
NAKANIWA AKIHIRO (JP)
SATO TAKASHI (JP)
Application Number:
PCT/JP2018/011026
Publication Date:
October 04, 2018
Filing Date:
March 20, 2018
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
International Classes:
G01M99/00
Foreign References:
| JPS5328806A | 1978-03-17 | |||
| JP2013084193A | 2013-05-09 | |||
| JP2015523576A | 2015-08-13 | |||
| US20090301055A1 | 2009-12-10 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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