JPS54117801A - Device for monitoring fatigue of rotary shaft - Google Patents
Device for monitoring fatigue of rotary shaftInfo
- Publication number
- JPS54117801A JPS54117801A JP2482178A JP2482178A JPS54117801A JP S54117801 A JPS54117801 A JP S54117801A JP 2482178 A JP2482178 A JP 2482178A JP 2482178 A JP2482178 A JP 2482178A JP S54117801 A JPS54117801 A JP S54117801A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- crack
- detector
- impedance
- fatigue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
PURPOSE: To dispatch an alarm from a device for monitoring the fatigue of a rotary shaft by detecting the fatigued crack of the shaft occurred as the sign of the fatigue rupture of the shaft by a detector such as an eddy current flaw detector or the like.
CONSTITUTION: When a crack is not occurred at a rotary shaft 5, the impedance of the coil 8A of a detector 8 such as an eddy current flaw detector or the like is retained constant by means of uniform electromagnetic induction of the shaft material 5 disposed in a high frequency magnetic field. When fatigued crack 11 occurs at the shaft 5, the above induction varies to allow the impedance of the coil of the detector 8 to alter. The relationship between the variations in this impedance and the magnitude of the crack is calibrated in advance. When the impedance variation occurs due to the occurrence of the crack of predetermined magnitude, it is externally notified by an alarm 10. The occurrence of the fatigued crack is detected thus prior to the rupture of the shaft 5 due to the fatigue to thereby prevent serious accident due to the rupture of the shaft 5.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2482178A JPS54117801A (en) | 1978-03-03 | 1978-03-03 | Device for monitoring fatigue of rotary shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2482178A JPS54117801A (en) | 1978-03-03 | 1978-03-03 | Device for monitoring fatigue of rotary shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54117801A true JPS54117801A (en) | 1979-09-12 |
Family
ID=12148839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2482178A Pending JPS54117801A (en) | 1978-03-03 | 1978-03-03 | Device for monitoring fatigue of rotary shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54117801A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008026086A (en) * | 2006-07-20 | 2008-02-07 | Satoshi Shimamoto | Damage evaluation device of metal material due to high sensitivity magnetic flux densimeter, damage evaluation method and damage evaluation system |
| EP3088661A1 (en) * | 2015-04-28 | 2016-11-02 | Siemens Aktiengesellschaft | Monitoring fatigue in steam turbine rotor |
-
1978
- 1978-03-03 JP JP2482178A patent/JPS54117801A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008026086A (en) * | 2006-07-20 | 2008-02-07 | Satoshi Shimamoto | Damage evaluation device of metal material due to high sensitivity magnetic flux densimeter, damage evaluation method and damage evaluation system |
| EP3088661A1 (en) * | 2015-04-28 | 2016-11-02 | Siemens Aktiengesellschaft | Monitoring fatigue in steam turbine rotor |
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