Estimation of the Lamb wave phase velocity dispersion curves using only two adjacent signals

Draudvilienė, Lina; Tumšys, Olgirdas; Mažeika, Liudas; Žukauskas, Egidijus

doi:10.1016/j.compstruct.2020.113174

Cited by 33 publications

(21 citation statements)

References 29 publications

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“…The simulated B-scan image of the defective sample (Figure 6a) was p filtering out reflections from the edges of the defect and the selective extractio A0 mode was performed. The processed simulated B-scan image with filtere In order to estimate the size of the defect, the phase velocity variations with respect to the distance are utilized by considering two adjacent signals acquired at two different spatial measurement positions with a moving window [33]. This technique has certain advantages over the conventional 2D-FFT based phase dispersion velocity calculation [34] that do not provide the coordinate and time information.…”

Section: The Signal Processingmentioning

confidence: 99%

“…In order to estimate the size of the defect, the phase velocity variations with respect to the distance are utilized by considering two adjacent signals acquired at two different spatial measurement positions with a moving window [ 33 ]. This technique has certain advantages over the conventional 2D-FFT based phase dispersion velocity calculation [ 34 ] that do not provide the coordinate and time information.…”

Section: The Signal Processingmentioning

confidence: 99%

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A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

Raišutis

Tiwari

Žukauskas

et al. 2021

Sensors

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The reliability of the wind turbine blade (WTB) evaluation using a new criterion is presented in the work. Variation of the ultrasonic guided waves (UGW) phase velocity is proposed to be used as a new criterion for defect detection. Based on an intermediate value between the maximum and minimum values, the calculation of the phase velocity threshold is used for defect detection, location and sizing. The operation of the proposed technique is verified using simulation and experimental studies. The artificially milled defect having a diameter of 81 mm on the segment of WTB is used for verification of the proposed technique. After the application of the proposed evaluation technique for analysis of the simulated B-scan image, the coordinates of defect edges have been estimated with relative errors of 3.7% and 3%, respectively. The size of the defect was estimated with a relative error of 2.7%. In the case of an experimentally measured B-scan image, the coordinates of defect edges have been estimated with relative errors of 12.5% and 3.9%, respectively. The size of the defect was estimated with a relative error of 10%. The comparative results obtained by modelling and experiment show the suitability of the proposed new criterion to be used for the defect detection tasks solving.

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Section: The Signal Processingmentioning

confidence: 99%

Section: The Signal Processingmentioning

confidence: 99%

A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

Raišutis

Tiwari

Žukauskas

et al. 2021

Sensors

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show abstract

“…The proposed algorithm consists of several previously investigated and verified algorithms, which are described in detail and investigated in or publications [ 24 , 25 , 26 ]. The new algorithm is designed as a combination of those algorithms for solving newly raised problems.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The 2D-FFT spectra of those B-scans (color) and the reconstructed phase velocities of the S 0 mode (dots) are shown in Figure 11 a,b. The method used for evaluation and reconstruction of the segments of those curves exploiting only two signals measured at two close points was described in detail in [ 25 ]. The metrological performance of this technique was described in [ 26 ].…”

Section: Experimental Verificationmentioning

confidence: 99%

Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

Kažys

Tumšys

2021

Sensors

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Ultrasonic guided waves are already used for material characterization. The advantage of these waves is that they propagate in the plane of a plate and their propagation characteristics are sensitive to properties of the material. The objective of this research was to develop an ultrasonic method that could be used to measure the properties of thin plastic polyvinylchloride films (PVC). The proposed method exploits two fundamental Lamb wave modes, A0 and S0, for measurement of a thin film thickness and Young’s modulus. The Young’s modulus is found from the measured phased velocity of the S0 mode and the film thickness from the velocities of both A0 and S0 modes. By using the proposed semi-contactless measurement algorithm, the Young’s modulus and thickness of different thickness (150 µm and 200 µm) PVC films were measured. The uncertainty of thickness measurements of the thinner 150 µm PVC film is 2% and the thicker 200 µm PVC film is 3.9%.

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“…The method, which enables reconstructing the phase velocity dispersion curves of Lamb waves using only two adjacent signals, was presented by Draudviliene et al [21]. The mathematical verification and the experimental research using signals propagating in the homogeneous aluminium plate were performed and presented in that work.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

2021

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The possibilities of an effective method of two adjacent signals are investigated for the evaluation of Lamb waves phase velocity dispersion in objects of different types, namely polyvinyl chloride (PVC) film and wind turbine blade (WTB). A new algorithm based on peaks of spectrum magnitude is presented and used for the comparison of the results. To use the presented method, the wavelength-dependent parameter is proposed to determine the optimal distance range, which is necessary in selecting two signals for analysis. It is determined that, in the range of 0.17–0.5 wavelength where δcph is not higher than 5%, it is appropriate to use in the case of an A0 mode in PVC film sample. The smallest error of 1.2%, in the distance greater than 1.5 wavelengths, is obtained in the case of the S0 mode. Using the method of two signals analysis for PVC sample, the phase velocity dispersion curve of the A0 mode is reconstructed using selected distances x1 = 70 mm and x2 = 70.5 mm between two spatial positions of a receiving transducer with a mean relative error δcph=2.8%, and for S0 mode, x1 = 61 mm and x2 = 79.7 mm with δcph=0.99%. In the case of the WTB sample, the range of 0.1–0.39 wavelength, where δcph is not higher than 3%, is determined as the optimal distance range between two adjacent signals. The phase velocity dispersion curve of the A0 mode is reconstructed in two frequency ranges: first, using selected distances x1 = 225 mm and x2 = 231 mm with mean relative error δcph=0.3%; and second, x1 = 225 mm and x2 = 237 mm with δcph=1.3%.

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Estimation of the Lamb wave phase velocity dispersion curves using only two adjacent signals

Cited by 33 publications

References 29 publications

A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

A Novel Defect Estimation Approach in Wind Turbine Blades Based on Phase Velocity Variation of Ultrasonic Guided Waves

Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

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