Dispersion loci of guided waves in viscoelastic composites of general anisotropy

Quintanilla, F. Hernando; Fan, Zheng; Lowe, M. J. S.

doi:10.1063/1.4940599

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…Fortunately, A0 mode could still be identified at the low frequency range, i.e. (10,140 kHz), where S0 mode is nearly invisible. A coarse IF estimation of A0 mode is achieved by tracing the local maxima along the ridge, and the STCFT is employed again using the estimated IF.…”

Section: Investigation Of the Proposed Methods Using Experimental Sig...mentioning

confidence: 99%

“…A0 mode components extracted from y i and y i+1 , respectively) is estimated via Hilbert transform, and the phase shift between them is then obtained from equation (31). Thirdly, the phase delay is calculated from equation (10) and displayed in figure 6. It can be seen that the phase delay fluctuates obviously in the high frequency range, related to the leading part of A0 waveform (i.e.…”

Section: Investigation Of the Proposed Methods Using Simulated Signalsmentioning

confidence: 99%

“…If the material parameters are given, dispersion curves could be computed numerically based on the elastic wave equation [7][8][9][10]. However, it may not be the case for composite structures, where elastic constants are not often available, or not precise due to manufacturing and maintenance uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Lamb wave phase velocity dispersion using time–frequency analysis

Zeng

Huang

Cao

et al. 2019

Smart Mater. Struct.

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Accurate knowledge of dispersion relations is of vital importance for Lamb wave-based damage detection. In this paper, an experimental technique is proposed to obtain the Lamb waves phase velocity dispersion without prior knowledge of material properties. It requires measurements at only two neighboring positions, and can evaluate phase velocity dispersion over a wide frequency range. In that technique, the short-time chirp-Fourier transform is first applied to the Lamb wave signals to achieve a concentrated time-frequency representation. On this basis, ridge tracking is completed and the group delay (GD) of the interested modes is estimated accurately. Subsequently, the Vold-Kalman filter is introduced to extract these wave modes, and the instantaneous phase is estimated from each individual wave mode via Hilbert transform. Lastly, the phase velocity is obtained as a function of the propagation distance, GD and phase shift. The proposed technique is investigated in two different mediums: simulated signals as Lamb wave propagating in an aluminum plate and experimental signals as that in a carbon fiber-reinforced polymer laminate. The results demonstrate its effectiveness and efficiency.

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Section: Investigation Of the Proposed Methods Using Experimental Sig...mentioning

confidence: 99%

Section: Investigation Of the Proposed Methods Using Simulated Signalsmentioning

confidence: 99%

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Determination of Lamb wave phase velocity dispersion using time–frequency analysis

Zeng

Huang

Cao

et al. 2019

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…For relatively simple structures like plates or pipes, dispersion curves can be predicted using the commercially available software Disperse ® , which uses the global matrix method [7]. Other methods, such as the transfer matrix method [8,9] or pseudospectral collocation method [10], have been utilized to determine dispersion curves. Finite element (FE) [11] and semi-analytical finite element [12,13] methods have been also used.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Guided Wave Dispersion Characteristics Using a Three-Transducer Measurement System

Crespo

Courtney²

2018

Applied Sciences

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Featured Application: Rapid generation of dispersion curves for guided wave applications when knowledge of the material properties and thickness of the structure to be inspected are unknown.Abstract: Guided ultrasonic waves are of significant interest in the health monitoring of thin structures, and dispersion curves are important tools in the deployment of any guided wave application. Most methods of determining dispersion curves require accurate knowledge of the material properties and thickness of the structure to be inspected, or extensive experimental tests. This paper presents an experimental technique that allows rapid generation of dispersion curves for guided wave applications when knowledge of the material properties and thickness of the structure to be inspected are unknown. The technique uses a single source and measurements at two points, making it experimentally simple. A formulation is presented that allows calculation of phase and group velocities if the wavepacket propagation time and relative phase shift can be measured. The methodology for determining the wavepacket propagation time and relative phase shift from the acquired signals is described. The technique is validated using synthesized signals, finite element model-generated signals and experimental signals from a 3 mm-thick aluminium plate. Accuracies to within 1% are achieved in the experimental measurements.

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Dispersion loci of guided waves in viscoelastic composites of general anisotropy

Cited by 2 publications

References 18 publications

Determination of Lamb wave phase velocity dispersion using time–frequency analysis

Determination of Lamb wave phase velocity dispersion using time–frequency analysis

Calculation of Guided Wave Dispersion Characteristics Using a Three-Transducer Measurement System

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