JPS5760230A - Orientating device for position of sound source - Google Patents

Orientating device for position of sound source

Info

Publication number
JPS5760230A
JPS5760230A JP55134356A JP13435680A JPS5760230A JP S5760230 A JPS5760230 A JP S5760230A JP 55134356 A JP55134356 A JP 55134356A JP 13435680 A JP13435680 A JP 13435680A JP S5760230 A JPS5760230 A JP S5760230A
Authority
JP
Japan
Prior art keywords
sound source
vibration wave
partial power
pattern
time delay
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
JP55134356A
Other languages
Japanese (ja)
Inventor
Yoshiaki Ichikawa
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 JP55134356A priority Critical patent/JPS5760230A/en
Publication of JPS5760230A publication Critical patent/JPS5760230A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To perform orientation of the position of the sound source of a vibration wave propagating on a structure by a method of pattern recognition. CONSTITUTION:A time delay T at a rise point of the vibration wave propagating from the sound source is measured and a square integral value of each signal amplitude is found. A value obtained by dividing each by the maximum P out of a partial power P obtained in this way is determined as a relative partial power RP. When the time delay T and the relative partial power RP thus obtained are plotted on vertical and horizontal axes respectively, a specific pattern is formed in the position of the sound source. On the surface of the pressure vessel 11 of a nuclear reactor an accelerometer 12 is arranged. A strike is applied to the expected position of the sound source of the pressure vessel of the reactor beforehand, the vibration wave is generated thereby, and a reference pattern corresponding to respective positions is obtained from this vibration wave. The orientation of the position of the sound source is conducted by selecting a reference pattern which is most similar to a pattern formed by the vibration wave generated from the sound source to be orientated.
JP55134356A 1980-09-29 1980-09-29 Orientating device for position of sound source Pending JPS5760230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55134356A JPS5760230A (en) 1980-09-29 1980-09-29 Orientating device for position of sound source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55134356A JPS5760230A (en) 1980-09-29 1980-09-29 Orientating device for position of sound source

Publications (1)

Publication Number Publication Date
JPS5760230A true JPS5760230A (en) 1982-04-12

Family

ID=15126448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55134356A Pending JPS5760230A (en) 1980-09-29 1980-09-29 Orientating device for position of sound source

Country Status (1)

Country Link
JP (1) JPS5760230A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183569A (en) * 1984-03-02 1985-09-19 Nippon Atom Ind Group Co Ltd Surveying method of signal generation source
WO2009057216A1 (en) * 2007-11-01 2009-05-07 Shikoku Electric Power Company Incorporated Loose parts monitoring method and device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183569A (en) * 1984-03-02 1985-09-19 Nippon Atom Ind Group Co Ltd Surveying method of signal generation source
WO2009057216A1 (en) * 2007-11-01 2009-05-07 Shikoku Electric Power Company Incorporated Loose parts monitoring method and device
JP4703766B2 (en) * 2007-11-01 2011-06-15 四国電力株式会社 Loose parts monitoring method and apparatus
US8446287B2 (en) 2007-11-01 2013-05-21 Shikoku Research Institute Incorporated Loose part monitoring method and system

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