Journal ArticleDOI
A quick method to construct 3-D velocity contour map for assessing anomalies in concrete
TLDR
In this article, the dispersion curve of A0 modal group velocity is extracted from the spectrogram of the recorded waveform by Short-Time Fourier transform (STFT) and reassigned method.About:
This article is published in Construction and Building Materials.The article was published on 2021-05-24. It has received 3 citations till now. The article focuses on the topics: Group velocity & Short-time Fourier transform.read more
Citations
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Journal ArticleDOI
Using 3-D velocity contour plots to detect voids in grouted tendon ducts in post-tensioned concrete construction
TL;DR: In this paper , a 3D velocity contour plot is constructed to detect voids in grouted tendon ducts by a stress-wave test method requiring a receiver and a small instrumented hammer.
Journal ArticleDOI
Detecting the Interfacial Bonding of Concrete-Filled Steel Tube Columns after Fire by Two Stress Wave-Based Methods — A Case Study
TL;DR: In this paper , the bonding conditions of concrete-filled steel columns of a high-rise building under construction after a fire was evaluated by two stress wave-based non-destructive test (NDT) methods in-situ.
Proceedings ArticleDOI
Using the 3-D velocities contour plot of surface waves to evaluate the fire-damaged concrete slabs
TL;DR: In this article , two concrete slabs heated to 600°C and 800°C on one surface were tested using a small hammer and a displacement receiver placed on the two ends of a test line.
References
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Journal ArticleDOI
Multichannel analysis of surface waves
TL;DR: In this article, a multichannel shot gather is decomposed into a swept-frequency record, allowing the fast generation of an accurate dispersion curve, which can then be examined and its effects appraised in both frequency and offset space.
BookDOI
Seismic Stratigraphy — Applications to Hydrocarbon Exploration
TL;DR: In this paper, the authors present a series of eleven papers under the subject heading of “Seismic stratigraphy and global changes of sea level” and describe the regional unconformities and stratigraphic changes resulting from sea level fluctuations, and the manner in which these changes can be interpreted from seismic surveys.
Journal ArticleDOI
Improving the readability of time-frequency and time-scale representations by the reassignment method
François Auger,Patrick Flandrin +1 more
TL;DR: The reassignment method, first applied by Kodera, Gendrin, and de Villedary (1976) to the spectrogram, is generalized to any bilinear time-frequency or time-scale distribution.
Journal ArticleDOI
Time-frequency representations of Lamb waves.
TL;DR: The utility of using TFRs to quantitatively resolve changes in the frequency content of these nonstationary signals, as a function of time, is illustrated.
Journal ArticleDOI
Algorithms for computing the time-corrected instantaneous frequency (reassigned) spectrogram, with applications.
Sean A. Fulop,Kelly Fitz +1 more
TL;DR: A unified theoretical picture of this time-frequency analysis method, the time-corrected instantaneous frequency spectrogram, together with detailed implementable algorithms comparing three published techniques for its computation are presented.
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