2004 년도 대한토목학회 학술발표회. Experimental Comparison of Structural Damage Detection Methods. 임현우 , 한국과학기술원 건설및환경공학과 석사과정 문영종 , 한국과학기술원 건설및환경공학과 박사과정 이종헌 , 경일대학교 토목환경공학과 교수 이인원 , 한국과학기술원 건설 및 환경공학과 교수. Introduction. - PowerPoint PPT Presentation
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2004년도 대한토목학회 학술발표회
임현우 , 한국과학기술원 건설및환경공학과 석사과정문영종 , 한국과학기술원 건설및환경공학과 박사과정이종헌 , 경일대학교 토목환경공학과 교수이인원 , 한국과학기술원 건설 및 환경공학과 교수
Experimental Comparison of Structural Experimental Comparison of Structural
Damage Detection Methods Damage Detection Methods
22Structural Dynamics & Vibration Control Lab., KAIST, KoreaStructural Dynamics & Vibration Control Lab., KAIST, Korea
Introduction
• Damage detection becomes a very important issue and, there are a lot of evaluation methods in this field.
• Experimental investigation was planed for comparison of some of these various methods.
• Aluminum cantilever beams are used for comparison of time, frequency domain and mode shape method.
• Experiment is focused on the applicability of the three methods
in practical situations.
33Structural Dynamics & Vibration Control Lab., KAIST, KoreaStructural Dynamics & Vibration Control Lab., KAIST, Korea
• Equipment
- FFT analyzer ( B&K )
- impact hammer ( PCB )
- accelerometer ( B&K )
- shaker ( YAVETEX )
• Equipment
- FFT analyzer ( B&K )
- impact hammer ( PCB )
- accelerometer ( B&K )
- shaker ( YAVETEX )
60cm aluminum beam4cm
0.4cm4
1
4
2
4
3• Damage case
- size (%) : 5, 10, 20, 30
- location : 1/4, 2/4, 3/4
Experimental setup
44Structural Dynamics & Vibration Control Lab., KAIST, KoreaStructural Dynamics & Vibration Control Lab., KAIST, Korea
Frequency domain method
0
0.1
0.2
0.3
0.4
0.5
1/4 2/4 3/4
(%)
Diff
ere
nces
10% Damage20%30%
Damage location
0
0.2
0.4
0.6
0.8
1/4 2/4 3/4
(%)
Diff
ere
nces
10% Damage20%30%
Damage location
0
0.2
0.4
0.6
0.8
1/4 2/4 3/4
(%)
Diff
ere
nces
10% Damage20%30%
Damage location
• Comparison of natural freq.
- measured freq : 1st,2nd,3rd
- damage case : 10, 20, 30%
: 1/4, 2/4, 3/4
• Comparison of natural freq.
- measured freq : 1st,2nd,3rd
- damage case : 10, 20, 30%
: 1/4, 2/4, 3/4 Differences in 1st natural freq.
Differences in 3rd natural freq.Differences in 2nd natural freq.
55Structural Dynamics & Vibration Control Lab., KAIST, KoreaStructural Dynamics & Vibration Control Lab., KAIST, Korea