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RISS 인기검색어
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- 저자 : Zhonghong Yan (검색결과 2 건)
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Frequency Slice Wavelet Transform for Dynamic Signal Analysis
Zhongwei Jiang,Zhonghong Yan 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
A new time-frequency analysis method, called frequency slice wavelet transform (FSWT), is introduced. The basic idea of FSWT comes from the short-time Fourier transform(STFT) by extension directly to frequency domain. The original signal can be decomposed by frequency slice function(FSF), which is similar to the wavelet base. Also the signal can be reconstructed by the FSWT representation in an easy way without the strict limitation in wavelet theory. In this paper, the basic theory of FSWT are described first. Tow application examples are demonstrated the efficiency of FSWT on structure dynamic analysis. First example shows how to identify or separate a complex impulse vibration signal. As the second example, FSWT is used to estimate the group velocity of A? Lamb wave in beam and to detect the reflection wave from a weak crack. The experimental result shows the accurate estimation of the arrival time of reflection wave from the crack and the group velocity with the aid of FSWT.
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Frequency Slice Wavelet Transform for Dynamic Siganal Analysis
Zhongwei Jiang,Zhonghong Yan 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
A new time-frequency analysis method, called frequency slice wavelet transform (FSWT), is introduced. The basic idea of FSWT comes from the short-time Fourier transform(STFT) by extension sirectly to frequency domain. The original signal can be decomposed by frequency slice function(FSF), which is similar to the wavelet base. Also the signal can be reconstructed by the FSWT representation in an easy way without the strict limitation in wevelet theory. In this paper, the basic theory of FSWT are described first. Tow application examples are demonstrated the efficiency of FSWT on structure dynamic analysis. First example shows how to identify or separate a complex impulse vibration signal. As the second example, FSWT is used to estimate the group velocity of A0 Lamb wave in beam and to detect the reflection wave from a weak crack. The experimental result shows the accurate estimation of the arrival time of reflection wave from the crack and the group velocity with the aid of FSWT.
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