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Title |
Comparison of Fragility Using Natural Frequency and Damping Parameter in System
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Authors |
이석민(Seok-Min Lee) ; 정범석(Beom-Seok Jung) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.048 |
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Keywords |
웨이블릿 변환 ; 손상도 ; 고유주파수 ; 감쇠변수 Wavelet transform ; Fragility ; Natural frequency ; Damping parameter |
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Abstract |
The purpose of the present study is to compare the reduction rate of natural frequency and the increase rate of damping parameter with structural damage in system. For this purpose, experiment and numerical simulation analysis are performed for the 2-span H-Beam with lower natural frequency and higher damping parameter from free vibration in structure. The response signal by impact load before and after damage is analyzed at 14 locations. The response signals for all locations are performed fast fourier transform to estimate the natural frequency reduction rate and wavelet transform to estimate the damping parameter increase rate. The time domain function corresponding to each scale(frequency) is separated from the response signal by wavelet parameter. The estimation of damping parameter increase rate using wavelet transform is more sensitive than the estimation of natural frequency reduction rate in structure.
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