Mode separation of Lamb waves based on dispersion compensation method
Ultrasonic Lamb modes typically propagate as a combination of multiple dispersive wave packets. Frequency components of each mode distribute widely in time domain due to dispersion and it is very challenging to separate individual modes by traditional signal processing methods. In the present study,...
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| Published in | The Journal of the Acoustical Society of America Vol. 131; no. 4; p. 2714 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
01.04.2012
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| Online Access | Get more information |
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| Abstract | Ultrasonic Lamb modes typically propagate as a combination of multiple dispersive wave packets. Frequency components of each mode distribute widely in time domain due to dispersion and it is very challenging to separate individual modes by traditional signal processing methods. In the present study, a method of dispersion compensation is proposed for the purpose of mode separation. This numerical method compensates, i.e., compresses, the individual dispersive waveforms into temporal pulses, which thereby become nearly un-overlapped in time and frequency and can thus be extracted individually by rectangular time windows. It was further illustrated that the dispersion compensation also provided a method for predicting the plate thickness. Finally, based on reversibility of the numerical compensation method, an artificial dispersion technique was used to restore the original waveform of each mode from the separated compensated pulse. Performances of the compensation separation techniques were evaluated by processing synthetic and experimental signals which consisted of multiple Lamb modes with high dispersion. Individual modes were extracted with good accordance with the original waveforms and theoretical predictions. |
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| AbstractList | Ultrasonic Lamb modes typically propagate as a combination of multiple dispersive wave packets. Frequency components of each mode distribute widely in time domain due to dispersion and it is very challenging to separate individual modes by traditional signal processing methods. In the present study, a method of dispersion compensation is proposed for the purpose of mode separation. This numerical method compensates, i.e., compresses, the individual dispersive waveforms into temporal pulses, which thereby become nearly un-overlapped in time and frequency and can thus be extracted individually by rectangular time windows. It was further illustrated that the dispersion compensation also provided a method for predicting the plate thickness. Finally, based on reversibility of the numerical compensation method, an artificial dispersion technique was used to restore the original waveform of each mode from the separated compensated pulse. Performances of the compensation separation techniques were evaluated by processing synthetic and experimental signals which consisted of multiple Lamb modes with high dispersion. Individual modes were extracted with good accordance with the original waveforms and theoretical predictions. |
| Author | Ta, Dean Wang, Weiqi Moilanen, Petro Xu, Kailiang |
| Author_xml | – sequence: 1 givenname: Kailiang surname: Xu fullname: Xu, Kailiang organization: Department of Electronic Engineering, Fudan University, Shanghai 200433, China – sequence: 2 givenname: Dean surname: Ta fullname: Ta, Dean – sequence: 3 givenname: Petro surname: Moilanen fullname: Moilanen, Petro – sequence: 4 givenname: Weiqi surname: Wang fullname: Wang, Weiqi |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/22501050$$D View this record in MEDLINE/PubMed |
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