Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities
Determining Lamb wave dispersion curves when measuring phase and group velocity values at a fixed frequency is now a common and relevant task. In most cases, in order to solve such a problem, it is necessary to know the exact properties of the material, particularly its thickness. In experimental me...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/2976 |
| _version_ | 1797504108764069888 |
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| author | Olgirdas Tumšys |
| author_facet | Olgirdas Tumšys |
| author_sort | Olgirdas Tumšys |
| collection | DOAJ |
| description | Determining Lamb wave dispersion curves when measuring phase and group velocity values at a fixed frequency is now a common and relevant task. In most cases, in order to solve such a problem, it is necessary to know the exact properties of the material, particularly its thickness. In experimental methods, Lamb wave parameters are evaluated directly from the test materials. This paper proposes a new and simple experimental algorithm for A<sub>0</sub> mode group and phase velocity determination based on signal filtering and zero-crossing estimating. The main idea is to capture the zero-crossing instances of the signals closest to the signal envelope peaks and use these time instances to determine the phase and group velocities. The reliability of the proposed method was evaluated using simulated and experimental signals propagating in an aluminum plate. Theoretical modeling has shown that the proposed method enables the calculation of the A<sub>0</sub> mode group and phase velocities with a mean relative error of less than 0.7%. An accuracy of 0.8% was observed during the experimental measurements. |
| first_indexed | 2024-03-10T04:00:56Z |
| format | Article |
| id | doaj.art-ead377318d64469689c2e590e607dec1 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:00:56Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ead377318d64469689c2e590e607dec12023-11-23T08:36:09ZengMDPI AGMaterials1996-19442022-04-01159297610.3390/ma15092976Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase VelocitiesOlgirdas Tumšys0Ultrasound Research Institute, Kaunas University of Technology, LT-51423 Kaunas, LithuaniaDetermining Lamb wave dispersion curves when measuring phase and group velocity values at a fixed frequency is now a common and relevant task. In most cases, in order to solve such a problem, it is necessary to know the exact properties of the material, particularly its thickness. In experimental methods, Lamb wave parameters are evaluated directly from the test materials. This paper proposes a new and simple experimental algorithm for A<sub>0</sub> mode group and phase velocity determination based on signal filtering and zero-crossing estimating. The main idea is to capture the zero-crossing instances of the signals closest to the signal envelope peaks and use these time instances to determine the phase and group velocities. The reliability of the proposed method was evaluated using simulated and experimental signals propagating in an aluminum plate. Theoretical modeling has shown that the proposed method enables the calculation of the A<sub>0</sub> mode group and phase velocities with a mean relative error of less than 0.7%. An accuracy of 0.8% was observed during the experimental measurements.https://www.mdpi.com/1996-1944/15/9/2976ultrasonic lamb waveA<sub>0</sub> modegroup velocityphase velocitysignal processingdispersion curve segments |
| spellingShingle | Olgirdas Tumšys Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities Materials ultrasonic lamb wave A<sub>0</sub> mode group velocity phase velocity signal processing dispersion curve segments |
| title | Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities |
| title_full | Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities |
| title_fullStr | Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities |
| title_full_unstemmed | Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities |
| title_short | Experimental Method for Simultaneous Determination of the Lamb Wave A<sub>0</sub> Modes Group and Phase Velocities |
| title_sort | experimental method for simultaneous determination of the lamb wave a sub 0 sub modes group and phase velocities |
| topic | ultrasonic lamb wave A<sub>0</sub> mode group velocity phase velocity signal processing dispersion curve segments |
| url | https://www.mdpi.com/1996-1944/15/9/2976 |
| work_keys_str_mv | AT olgirdastumsys experimentalmethodforsimultaneousdeterminationofthelambwaveasub0submodesgroupandphasevelocities |