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- W2377457948 abstract "In order to further understand the nonstationary characteristic of ground motion,a new method to estimate the time-dependent power spectral density (PSD) was proposed based on wavelet transform. With utilizing the band-pass filtering characteristics of wavelet transform and combining the physical meaning of time-dependent PSD,the relations between the wavelet coefficient and time-dependent PSD on different frequency bands were deduced in terms of energy. And then the time-dependent PSD was estimated through the wavelet coefficient of ground motion signals. Using the proposed method,the time-dependent PSD for both measured and simulated ground motion signals was respectively estimated and compared with the PSD based on Fourier transform. The results show that the present method is feasible and correct. The method can extend the original two-dimentional relation of frequency-amplitude to three-dimentional relation of time-frequency-amplitude,and avoid the lack of time information in the traditional PSD estimation based on Fourier transform." @default.
- W2377457948 created "2016-06-24" @default.
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- W2377457948 date "2010-01-01" @default.
- W2377457948 modified "2023-09-23" @default.
- W2377457948 title "Estimation of time-dependent power spectral density of seismic wave based on wavelet transform" @default.
- W2377457948 hasPublicationYear "2010" @default.
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