KR960001749A - Nondestructive testing method by measuring natural frequency - Google Patents

Nondestructive testing method by measuring natural frequency Download PDF

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Publication number
KR960001749A
KR960001749A KR1019940013489A KR19940013489A KR960001749A KR 960001749 A KR960001749 A KR 960001749A KR 1019940013489 A KR1019940013489 A KR 1019940013489A KR 19940013489 A KR19940013489 A KR 19940013489A KR 960001749 A KR960001749 A KR 960001749A
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KR
South Korea
Prior art keywords
predetermined material
natural frequency
vibration
measuring
defects
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KR1019940013489A
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Korean (ko)
Inventor
이재원
한병기
이성희
Original Assignee
경주현
삼성중공업 주식회사
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Priority to KR1019940013489A priority Critical patent/KR960001749A/en
Publication of KR960001749A publication Critical patent/KR960001749A/en

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  • Analysing Materials By The Use Of Radiation (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

본 발명은 재료의 비파괴검사방법에 관한 것으로, 특히, 금속, 플라스틱 뿐만아니라, 산업용으로 널리 사용되는 복합재료나, 이러한 재료들로 구성된 구조물의 고유진동수를 측정하여 재료내부의 박리결함을 측정하는 비파괴검사 방법에 관한 것이다. 본발명은 소정재료의 지지조건등을 고려하여 상기 소정재료의 진동을 수치해석하는 단계, 상기 소정재료에 힘을 가하여 진동을 발생시키는 단계, 상기 소정재료의 고유진동수를 측정하는 단계, 및 상기 측정된 상기 소정재료의 고유진동수와 상기 수치해석에 의한 소정재료의 진동수를 비교분석하여 상기 소정재료 내부에 존재하는 박리결함에 대한 정보를 추정하는 단계를 포함하는 것을 특징으로 한다. 본 발명에 따른 고유진동수 측정에 의한 비파괴검사방법을 이용하여 박리결함의 위치, 크기를 추정한 후, 국부적으로 신뢰성을 높이고 보다 상세한 결함의 위치 및 크기의 탐상을 위해 초음파탐상, 엑스레이탐상등의 비파괴검사방법과 연계하여 사용하면 매우 효과적이다.The present invention relates to a method for nondestructive testing of materials, and more particularly, to non-destructive measurement of peeling defects in a material by measuring a natural frequency of a composite material or a structure composed of such materials, as well as metals and plastics. It is about a test method. The present invention is to numerically analyze the vibration of the predetermined material in consideration of the support conditions of the predetermined material, generating a vibration by applying a force to the predetermined material, measuring the natural frequency of the predetermined material, and the measurement And comparing the natural frequency of the predetermined material with the frequency of the predetermined material by the numerical analysis to estimate information on peeling defects existing in the predetermined material. After estimating the location and size of the flaw defects using the non-destructive testing method using the natural frequency measurement according to the present invention, to increase the local reliability and to detect the location and size of the defects in detail, the non-destructive method such as ultrasound, X-ray, etc. It is very effective when used in conjunction with the test method.

Description

고유진동수 측정에 의한 비파괴검사방법Nondestructive testing method by measuring natural frequency

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명에 따른 고유진동수 측정에 의한 비파괴검사방법을 설명하기 위한 설명도.1 is an explanatory diagram for explaining a non-destructive inspection method by measuring the natural frequency according to the present invention.

Claims (3)

구조물을 구성하는 소정재료의 내부결함을 검사하기 위한 비파괴검사방법에 있어서, 상기 소정재료의 지지조건등을 고려하여 상기 소정재료의 진동특성을 수치해석하는 해석단계; 상기 소정재료에 힘을 가하여 진동을 발생시키는 진동발생단계; 상기 소정재료의 고유진동수를 측정하는 고유진동수 측정단계; 및 상기 측정된 상기 소정재료의 고유진동수와 상기 수치해석에 의한 소정재료의 진동수를 비교분석하여 상기 소정재료 내부에 존재하는 박리결함에 대한 정보를 추정하는 단계를 포함하는 것을 특징으로 하는 고유진동수 특정에 의한 비파괴검사방법.A non-destructive inspection method for inspecting internal defects of a predetermined material constituting a structure, comprising: an analysis step of numerically analyzing vibration characteristics of the predetermined material in consideration of support conditions of the predetermined material; A vibration generating step of generating a vibration by applying a force to the predetermined material; A natural frequency measuring step of measuring a natural frequency of the predetermined material; And estimating information about peeling defects existing in the predetermined material by comparing and analyzing the measured natural frequencies of the predetermined material and frequencies of the predetermined material by the numerical analysis. Nondestructive testing method by 제1항에 있어서, 상기 해석단계는 상기 소정재료의 지지에 따른 경계조건을 설정하는 단계; 상기 소정재료의 박리결함에 따른 분리된 두부분의 상호 경계조건을 설정하는 단계; 상기 소정재료의 박리결함의 경계선에 따른 경계조건을 설정하는 단계; 보의 지배 방정식을 이용하여 수치해석하는 수치해석단계; 및 상기 소정재료에 대한 수치해석의 결과를 시뮬레이션하는 시뮬레이션 단계를 포함하는 것을 특징으로 하는 고유진동수 측정에 의한 비파괴검사방법.The method of claim 1, wherein the analyzing step comprises: setting a boundary condition according to the support of the predetermined material; Setting a mutual boundary condition of the two parts separated by the peeling defect of the predetermined material; Setting a boundary condition according to a boundary line of the peeling defect of the predetermined material; Numerical analysis step using the governing equation of the beam; And a simulation step of simulating a result of the numerical analysis of the predetermined material. 제1항에 있어서, 상기 진동발생단계에는 상기 소정재료의 진동모드별로 진동이 발생되는 것을 특징으로하는 고유진동수 측정에 의한 비파괴 검사방법.The method of claim 1, wherein in the vibration generating step, vibration is generated for each vibration mode of the predetermined material. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940013489A 1994-06-15 1994-06-15 Nondestructive testing method by measuring natural frequency KR960001749A (en)

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KR1019940013489A KR960001749A (en) 1994-06-15 1994-06-15 Nondestructive testing method by measuring natural frequency

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100272253B1 (en) * 1997-01-23 2000-12-01 윤종용 Apparatus adopting non-distruction method for testing quartz tube
KR100472881B1 (en) * 2002-08-28 2005-03-08 주식회사 길종합건축사사무소 Estimating method of superannuation extent of buildings
KR100496025B1 (en) * 2002-11-29 2005-06-16 대한민국 Portable nondestructive quality evaluator for watermelon
KR101369500B1 (en) * 2012-10-10 2014-03-05 부산대학교 산학협력단 Method for interpreting the mode of ultrasonic guided waves

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100272253B1 (en) * 1997-01-23 2000-12-01 윤종용 Apparatus adopting non-distruction method for testing quartz tube
KR100472881B1 (en) * 2002-08-28 2005-03-08 주식회사 길종합건축사사무소 Estimating method of superannuation extent of buildings
KR100496025B1 (en) * 2002-11-29 2005-06-16 대한민국 Portable nondestructive quality evaluator for watermelon
KR101369500B1 (en) * 2012-10-10 2014-03-05 부산대학교 산학협력단 Method for interpreting the mode of ultrasonic guided waves

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