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• W58161717 abstract "Abstract: The primary objective of this chapter is to develop output only modal identification and structural damage detection. Identification of multidegree of freedom (MDOF) linear time invariant (LTI) and linear time variant (LTV – due to damage) systems based on time-frequency (TF) techniques – such as short-time Fourier transform (STFT), empirical mode decomposition (EMD), and wavelets – and also a newly-merging blind source separation (BSS) technique is discussed. STFT, EMD, and wavelet methods developed to date are reviewed in sufficient detail. In addition, a Hilbert transform (HT) approach to determine frequency and damping is also presented. In this chapter STFT, EMD, HT, and wavelet techniques are developed for decomposition of free-vibration response of MDOF systems into their modal components. Once the modal components are obtained, each one is processed using HT to obtain the modal frequency and damping ratios. In addition, the ratio of modal components at different degrees of freedom facilitate determination of mode shape. In cases with output only modal identification using ambient/random response the random decrement technique is used to obtain free-vibration response. The advantage of TF techniques is that they are signal-based, hence, they can be used for output only modal identification. A three degree of freedom 1:10 scale model test structure is used to validate the proposed output only modal identification techniques based on STFT, EMD, HT, and wavelets. Both measured free-vibration and forced-vibration (white noise) response are considered. The second objective of this chapter is to show the relative ease with which the TF techniques can be used for modal identification and their potential for real-world applications wherein output only identification is essential. Recorded ambient vibration data processed using techniques such as random decrement technique can be used to obtain the free-vibration response, so that further processing using TF-based modal identification can be performed." @default.
• W58161717 created "2016-06-24" @default.
• W58161717 creator A5017616189 @default.
• W58161717 creator A5038689535 @default.
• W58161717 creator A5067299698 @default.
• W58161717 date "2014-01-01" @default.
• W58161717 modified "2023-09-23" @default.
• W58161717 title "Output only modal identification and structural damage detection using timefrequency and wavelet techniques for assessing and monitoring civil infrastructures" @default.
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