JPS57142539A - Detecting method for relaxation of steam turbine casing bolt - Google Patents

Detecting method for relaxation of steam turbine casing bolt

Info

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
Application number
JP2704381A
Other languages
Japanese (ja)
Inventor
Makoto Hayashi
Shinji Sakata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2704381A priority Critical patent/JPS57142539A/en
Publication of JPS57142539A publication Critical patent/JPS57142539A/en
Pending legal-status Critical Current

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.
JP2704381A 1981-02-27 1981-02-27 Detecting method for relaxation of steam turbine casing bolt Pending JPS57142539A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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