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- W2109148599 abstract "Identification of modal parameters is considered from response data of structural systems under nonstationary ambient vibration. It is shown theoretically that by assuming the ambient excitation to be nonstationary white noise in the form of a product model, the nonstationary response signals can be converted into free-vibration data via the correlation technique. The practical problem of insufficient data samples available for evaluating nonstationary correlation can be approximately resolved by first extracting the amplitude-modulating function from the response and then transforming the nonstationary responses into stationary ones. Modal-parameter identification can then be performed using the Ibrahim time-domain technique, which is effective at identifying closely spaced modes. The theory proposed can be further extended by using the filtering concept to cover the case of nonstationary color excitations. Numerical simulations confirm the validity of the proposed method for identification of modal parameters from nonstationary ambient response data." @default.
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- W2109148599 date "2008-11-01" @default.
- W2109148599 modified "2023-09-26" @default.
- W2109148599 title "Identification of Modal Parameters from Nonstationary Ambient Vibration Data Using Correlation Technique" @default.
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- W2109148599 doi "https://doi.org/10.2514/1.34272" @default.
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