Seismic denoising using the redundant lifting scheme

Aghayan, Afshin; Jaiswal, Priyank; Siahkoohi, Hamid Reza

doi:10.1190/segam2016-13970320.1

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…In Figure 10A, the increase of

∆ {\overset{truė}{W}}_{2 ω}

during the test for all the samples is continuous, even if a small slope changing few stress levels before 200 MPa can be observed. At R = −1 (Figure 10B),

∆ {\overset{truė}{W}}_{2 ω}

data presents a marked slope variation in correspondence of 300 MPa due to inelastic point transition 23,44–46 …”

Section: Resultsmentioning

confidence: 99%

“…The following list (according to Figure 4) reports the detailed analysis carried out to obtain

∆ {\overset{truė}{W}}_{2 ω}

via the assessment of

\overset{W}{true}

: Assessing the vectors of σ and ε . Evaluating

\overset{ε}{true} = italicΔε / italicΔt

, the approximate time derivative of the strain by using the MATLAB operator “diff” that calculates finite differences between adjacent elements of a vector along a specific array dimension. Evaluating

\overset{W}{true}

as the product between σ and

\overset{ε}{true}

. Performing the discrete Fourier transform (DFT) of

\overset{W}{true}

by using a specific algorithm 44 based on MATLAB fast Fourier transform tool. Assessing the SAH of mechanical energy rate,

∆ {\overset{truė}{W}}_{2 ω} .

…”

Section: Methods and Data Processingmentioning

confidence: 99%

“…The processing of thermal data involved the following stages: Acquisition of the temperature signal, T ( t ) , from infrared thermal camera. Selection of a ROI whose data (temperature over the time) are exported. Evaluation of the mean value ( T m ( t )) of the ROI in each frame of the temporal sequence. Performing the DFT of the temperature signal by using a specific algorithm 44 based on MATLAB® fast Fourier transform tool. Assessing the SAH of temperature signal, ∆ T 2 ω . Evaluating SAH of heat energy rate dissipated

∆ {\overset{E}{true}}_{d}_{2 ω}

by using Equation 13. …”

Section: Methods and Data Processingmentioning

confidence: 99%

See 2 more Smart Citations

On the relationship between mechanical energy rate and heat dissipated rate during fatigue for a C45 steel depending on stress ratio

Finis

Palumbo

Galietti

2021

Fatigue Fract Eng Mat Struct

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This work deals with the analysis in the frequency domain of the temperature signal and mechanical energy rate of C45 steel under two different fatigue stepwise loading series at stress ratios of 0.1 and −1. It was first investigated the energy distribution among the harmonic components of the signals to understand possible variations caused by a different stress ratio. In addition, the second amplitude harmonic (SAH) of heat dissipated and mechanical energy rates have been considered in the analysis, and their relationship was investigated. It has been shown as it depends only on the material, and hence, it is valid whatever the kind of the test is without any assumption on the energy supplied to the material or material hysteresis loop stabilization. The adopted approach allows the analysis of intrinsic dissipations by means of rapid, full‐field, and contactless techniques without any specific requirement on loading condition or temperature signal stabilization.

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“…In Figure 10A, the increase of

∆ {\overset{truė}{W}}_{2 ω}

during the test for all the samples is continuous, even if a small slope changing few stress levels before 200 MPa can be observed. At R = −1 (Figure 10B),

∆ {\overset{truė}{W}}_{2 ω}

data presents a marked slope variation in correspondence of 300 MPa due to inelastic point transition 23,44–46 …”

Section: Resultsmentioning

confidence: 99%

“…The following list (according to Figure 4) reports the detailed analysis carried out to obtain

∆ {\overset{truė}{W}}_{2 ω}

via the assessment of

\overset{W}{true}

: Assessing the vectors of σ and ε . Evaluating

\overset{ε}{true} = italicΔε / italicΔt

\overset{W}{true}

as the product between σ and

\overset{ε}{true}

. Performing the discrete Fourier transform (DFT) of

\overset{W}{true}

by using a specific algorithm 44 based on MATLAB fast Fourier transform tool. Assessing the SAH of mechanical energy rate,

∆ {\overset{truė}{W}}_{2 ω} .

…”

Section: Methods and Data Processingmentioning

confidence: 99%

∆ {\overset{E}{true}}_{d}_{2 ω}

by using Equation 13. …”

Section: Methods and Data Processingmentioning

confidence: 99%

See 1 more Smart Citation

On the relationship between mechanical energy rate and heat dissipated rate during fatigue for a C45 steel depending on stress ratio

Finis

Palumbo

Galietti

2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

Noise suppression using a near-source wavelet

Aghayan

Jaiswal

2021

GEOPHYSICS

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Denoising becomes a non-trivial task when noise and signal overlap in multiple domains such as time, frequency, and velocity. Fortunately, signal and noise waveforms in general tend to remain morphologically different. This paper shows how morphological differences can be used to separate body-wave signals from other waveforms such as ground roll and cultural noise. The key was finding a wavelet that was a close approximation of the true source signature (SS) and remained uncontaminated by the Greens function in any significant manner. An inverse filter designed using such a wavelet selectively compressed the body waves which was then extracted using median and low-pass filters. The overall phenomenon is explained with a synthetic example. The idea is also tested on a land dataset that was generated using a large weight drop source where a wavelet recorded ∼3 m from the source location fulfilled the criteria set in the proposed method. Results suggest that the incremental effort of recording an extra trace close to the source location during acquisition may provide previously unavailable denoising opportunities during processing although the trace itself may be redundant for imaging.

show abstract

Seismic denoising using the redundant lifting scheme

Cited by 2 publications

References 15 publications

On the relationship between mechanical energy rate and heat dissipated rate during fatigue for a C45 steel depending on stress ratio

On the relationship between mechanical energy rate and heat dissipated rate during fatigue for a C45 steel depending on stress ratio

Noise suppression using a near-source wavelet

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