JPS5934147A - Flaw detector for rotor blade - Google Patents

Flaw detector for rotor blade

Info

Publication number
JPS5934147A
JPS5934147A JP57143279A JP14327982A JPS5934147A JP S5934147 A JPS5934147 A JP S5934147A JP 57143279 A JP57143279 A JP 57143279A JP 14327982 A JP14327982 A JP 14327982A JP S5934147 A JPS5934147 A JP S5934147A
Authority
JP
Japan
Prior art keywords
blade
frequency
abnormality
obtd
detected
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
JP57143279A
Other languages
Japanese (ja)
Inventor
Tadashi Kobayashi
Original Assignee
Nissan Motor Co 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP57143279A priority Critical patent/JPS5934147A/en
Publication of JPS5934147A publication Critical patent/JPS5934147A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C3/00—Registering or indicating the condition or the working of machines or other apparatus, other than vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/26—Scanned objects
    • G01N2291/269—Various geometry objects
    • G01N2291/2693—Rotor or turbine parts

Abstract

PURPOSE:To judt the abnormality of a blade mounted to a rotor by detecting and storing the frequency output from the acoustic wave obtd. by hammering the blade and comparing the same with the frequency output of the next blade. CONSTITUTION:When a blade 2 is hammered, the oscillation sound thereof is collected with a microphone 6 and is inputted to a frequency detection circuit 7; therefore, the specific frequency with said blade 2 is detected in synchronization with the timing signal from a transmitter 8. The detected frequency detection signal is supplied to an arithmetic section 9 and is temporarily stored in a storage device 12. The frequency of the blade 2A obtd. before the same and the frequency obtd. from the blade 2 are compared in a comparator 13, and when there is a difference of a prescribed value or above between both frequencies as a result of the comparison, the section 9 discriminates the presence of abnormality and supplies the abnormality signal to an abnormality announcing means 11.
JP57143279A 1982-08-20 1982-08-20 Flaw detector for rotor blade Pending JPS5934147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57143279A JPS5934147A (en) 1982-08-20 1982-08-20 Flaw detector for rotor blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57143279A JPS5934147A (en) 1982-08-20 1982-08-20 Flaw detector for rotor blade

Publications (1)

Publication Number Publication Date
JPS5934147A true JPS5934147A (en) 1984-02-24

Family

ID=15335039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57143279A Pending JPS5934147A (en) 1982-08-20 1982-08-20 Flaw detector for rotor blade

Country Status (1)

Country Link
JP (1) JPS5934147A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615861A1 (en) * 1985-05-20 1986-11-20 Toshiba Ceramics Co., Ltd., Tokio/Tokyo SINTER BODY BASED ON SILICON CARBIDE AND METHOD FOR THE PRODUCTION THEREOF
US5034355A (en) * 1987-10-28 1991-07-23 Kabushiki Kaisha Toyota Chuo Kenkyusho Tough silicon carbide composite material containing fibrous boride
DE102009046804A1 (en) * 2009-11-18 2011-05-19 Man Diesel & Turbo Se Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value
CN103592365A (en) * 2013-11-14 2014-02-19 西安交通大学 Rapid rotor crack detection method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3615861A1 (en) * 1985-05-20 1986-11-20 Toshiba Ceramics Co., Ltd., Tokio/Tokyo SINTER BODY BASED ON SILICON CARBIDE AND METHOD FOR THE PRODUCTION THEREOF
US5034355A (en) * 1987-10-28 1991-07-23 Kabushiki Kaisha Toyota Chuo Kenkyusho Tough silicon carbide composite material containing fibrous boride
DE102009046804A1 (en) * 2009-11-18 2011-05-19 Man Diesel & Turbo Se Method for crack detection on blades of rotor of e.g. gas turbine, involves comparing recorded frequency spectrum with center value such that cracked blades are closed when frequency spectrum of blades incorrectly deviates from center value
JP2011107127A (en) * 2009-11-18 2011-06-02 Man Diesel & Turbo Se Crack inspection method of rotor blade of turbo engine
CN102095803A (en) * 2009-11-18 2011-06-15 曼柴油机和涡轮机欧洲股份公司 Method for crack detection on blades of rotor
CN103592365A (en) * 2013-11-14 2014-02-19 西安交通大学 Rapid rotor crack detection method

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