JPS57142539A - Detecting method for relaxation of steam turbine casing bolt - Google Patents
Detecting method for relaxation of steam turbine casing boltInfo
- Publication number
- JPS57142539A JPS57142539A JP2704381A JP2704381A JPS57142539A JP S57142539 A JPS57142539 A JP S57142539A JP 2704381 A JP2704381 A JP 2704381A JP 2704381 A JP2704381 A JP 2704381A JP S57142539 A JPS57142539 A JP S57142539A
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- period
- relaxation
- steam turbine
- turbine casing
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Control Of Turbines (AREA)
Abstract
PURPOSE:To determine a stress from a change in acoustic velocity of a ultrasonic wave propagating in a bolt and decides the degree of relaxation of the bolt from the stress. CONSTITUTION:A ultrasonic transmitting and receiving element 5 is attached to one end of a steam turbine casing bolt 4, and a trigger signal generated by a single pulse generator 1 is inputted to the element 5. The element 5 receives an echo signal from the bolt bottom, and the echo signal, amplified by an amplifier 6, is caused to pass through a low-pass filter 7 and a high-press filter 8 to remove noise. It is returned as a trigger signal to a pulser 3 via an echo shaping circuit 9, while is sent as a ultrasonic pulse to the element 5 again, and said operations are repeated. The period of the pulse oscillation is accumulated by a universal counter 12 for measurement. A period T both under a no-load condition and a load condition is stored in a comparison circuit 13, and is compared with the period T available after used for a long perid of time to determine a tightening force.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2704381A JPS57142539A (en) | 1981-02-27 | 1981-02-27 | Detecting method for relaxation of steam turbine casing bolt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2704381A JPS57142539A (en) | 1981-02-27 | 1981-02-27 | Detecting method for relaxation of steam turbine casing bolt |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57142539A true JPS57142539A (en) | 1982-09-03 |
Family
ID=12210034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2704381A Pending JPS57142539A (en) | 1981-02-27 | 1981-02-27 | Detecting method for relaxation of steam turbine casing bolt |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57142539A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6413433A (en) * | 1987-07-08 | 1989-01-18 | Nippon Kensetsu Kikaika Kyokai | Rod type fixing device and its using method |
-
1981
- 1981-02-27 JP JP2704381A patent/JPS57142539A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6413433A (en) * | 1987-07-08 | 1989-01-18 | Nippon Kensetsu Kikaika Kyokai | Rod type fixing device and its using method |
JPH0541933B2 (en) * | 1987-07-08 | 1993-06-25 | Nippon Kensetsu Kikaika Kyokai |
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