A pulse coding and decoding strategy to perform Lamb wave inspections using simultaneously multiple actuators
•Simultaneous excitation of multiple transducers in guided wave structural health monitoring systems.•Damage imaging for spread spectrum coded pulses.•Warped cross-correlation for pulse compression and dispersion compensation. The performance of Lamb wave based monitoring systems, both in terms of d...
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| Published in: | Mechanical systems and signal processing Vol. 91; pp. 111 - 121 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
01.07.2017
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| ISSN: | 0888-3270, 1096-1216 |
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| Abstract | •Simultaneous excitation of multiple transducers in guided wave structural health monitoring systems.•Damage imaging for spread spectrum coded pulses.•Warped cross-correlation for pulse compression and dispersion compensation.
The performance of Lamb wave based monitoring systems, both in terms of diagnosis time and data complexity, can be enhanced by increasing the number of transducers used to actuate simultaneously the guided waves in the inspected medium. However, in case of multiple simultaneously-operated actuators the interference among the excited wave modes within the acquired signals has to be considered for the further processing. To this aim, in this work a code division strategy based on the Warped Frequency Transform is presented. At first, the proposed procedure encodes actuation pulses using Gold sequences. Next, for each considered actuator the acquired signals are compensated from dispersion by cross correlating the warped version of the actuated and received signals. Compensated signals form the base for a final wavenumber imaging meant at emphasizing defects and or anomalies by removing incident wavefield and edge reflections. The proposed strategy is tested numerically, and validated through an experiment in which guided waves are actuated in a plate by four piezoelectric transducers operating simultaneously. |
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| AbstractList | •Simultaneous excitation of multiple transducers in guided wave structural health monitoring systems.•Damage imaging for spread spectrum coded pulses.•Warped cross-correlation for pulse compression and dispersion compensation.
The performance of Lamb wave based monitoring systems, both in terms of diagnosis time and data complexity, can be enhanced by increasing the number of transducers used to actuate simultaneously the guided waves in the inspected medium. However, in case of multiple simultaneously-operated actuators the interference among the excited wave modes within the acquired signals has to be considered for the further processing. To this aim, in this work a code division strategy based on the Warped Frequency Transform is presented. At first, the proposed procedure encodes actuation pulses using Gold sequences. Next, for each considered actuator the acquired signals are compensated from dispersion by cross correlating the warped version of the actuated and received signals. Compensated signals form the base for a final wavenumber imaging meant at emphasizing defects and or anomalies by removing incident wavefield and edge reflections. The proposed strategy is tested numerically, and validated through an experiment in which guided waves are actuated in a plate by four piezoelectric transducers operating simultaneously. The performance of Lamb wave based monitoring systems, both in terms of diagnosis time and data complexity, can be enhanced by increasing the number of transducers used to actuate simultaneously the guided waves in the inspected medium. However, in case of multiple simultaneously-operated actuators the interference among the excited wave modes within the acquired signals has to be considered for the further processing. To this aim, in this work a code division strategy based on the Warped Frequency Transform is presented. At first, the proposed procedure encodes actuation pulses using Gold sequences. Next, for each considered actuator the acquired signals are compensated from dispersion by cross correlating the warped version of the actuated and received signals. Compensated signals form the base for a final wavenumber imaging meant at emphasizing defects and or anomalies by removing incident wavefield and edge reflections. The proposed strategy is tested numerically, and validated through an experiment in which guided waves are actuated in a plate by four piezoelectric transducers operating simultaneously. |
| Author | De Marchi, Luca Ostachowicz, Wiesław Kudela, Paweł Marzani, Alessandro Moll, Jochen Radzieński, Maciej |
| Author_xml | – sequence: 1 givenname: Luca surname: De Marchi fullname: De Marchi, Luca email: l.demarchi@unibo.it organization: Department of Electrical, Electronic, and Information Engineering, University of Bologna, Italy – sequence: 2 givenname: Alessandro surname: Marzani fullname: Marzani, Alessandro email: alessandro.marzani@unibo.it organization: Department of Civil, Environmental and Materials Engineering - DICAM, University of Bologna, Italy – sequence: 3 givenname: Jochen surname: Moll fullname: Moll, Jochen email: moll@physik.uni-frankfurt.de organization: Department of Physics, Goethe University of Frankfurt am Main, Germany – sequence: 4 givenname: Paweł surname: Kudela fullname: Kudela, Paweł email: pk@imp.gda.pl organization: Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland – sequence: 5 givenname: Maciej surname: Radzieński fullname: Radzieński, Maciej email: mradzienski@imp.gda.pl organization: Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland – sequence: 6 givenname: Wiesław surname: Ostachowicz fullname: Ostachowicz, Wiesław email: wieslaw@imp.gda.pl organization: Institute of Fluid Flow Machinery, Polish Academy of Sciences, Poland |
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| Cites_doi | 10.1121/1.417193 10.1109/35.714616 10.1109/TSP.2009.2034323 10.1016/0041-624X(83)90070-7 10.1049/el:19770327 10.1016/j.ultras.2014.03.007 10.1016/S0041-624X(02)00201-9 10.1016/j.jsv.2006.01.021 10.1109/TUFFC.2014.006606 10.1109/TUFFC.2003.1197965 10.1016/j.jsv.2012.04.033 10.1016/j.ymssp.2012.10.018 10.1016/j.ndteint.2013.04.003 10.1016/j.jsv.2006.01.020 10.1088/0964-1726/13/2/002 10.1109/TUFFC.2009.1305 10.1016/j.ymssp.2014.05.041 10.1088/0964-1726/20/3/035021 10.1121/1.4922823 |
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| Keywords | Laser vibrometry Lamb wave inspections Wavenumber filtering Warped frequency transform Spread spectrum pulse coding |
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| References | Sicard, Goyette, Zellouf (b0095) 2002; 40 Su, Ye, Lu (b0005) 2006; 295 De Marchi, Marzani, Caporale, Speciale (b0045) 2009; 56 Flynn, Chong, Jarmer, Lee (b0110) 2013; 59 Caporale, Callegari, Ricci, Burrascano (b0020) 2015 De Marchi, Marzani, Speciale, Viola (b0080) 2011; 20 Moll, Wandowski, Malinowski, Radzienski, Opoka, Ostachowicz (b0070) 2015; 138 Castaings, Cawley (b0015) 1996; 100 Bartoli, Marzani, Lanza di Scalea, Viola (b0075) 2006; 295 Hutchins, Burrascano, Davis, Laureti, Ricci (b0065) 2014; 54 Booer, Chambers, Mason (b0090) 1977; 16 Fu, Shi, Zhou, Cai (b0105) 2014; 61 De Marchi, Perelli, Marzani (b0030) 2013; 39 White (b0035) 2010 Viterbi (b0040) 1995 Caporale, De Marchi, Speciale (b0085) 2010; 58 Dinan, Jabbari (b0060) 1998; 36 Moll, Fritzen (b0025) 2012; 331 Lee, Furgason (b0055) 1983; 21 Kudela, Radzieński, Ostachowicz (b0050) 2015; 50 Staszewski, Lee, Mallet, Scarpa (b0010) 2004; 13 Wilcox (b0100) 2003; 50 Dinan (10.1016/j.ymssp.2016.12.014_b0060) 1998; 36 Flynn (10.1016/j.ymssp.2016.12.014_b0110) 2013; 59 De Marchi (10.1016/j.ymssp.2016.12.014_b0080) 2011; 20 White (10.1016/j.ymssp.2016.12.014_b0035) 2010 De Marchi (10.1016/j.ymssp.2016.12.014_b0045) 2009; 56 Kudela (10.1016/j.ymssp.2016.12.014_b0050) 2015; 50 Su (10.1016/j.ymssp.2016.12.014_b0005) 2006; 295 Staszewski (10.1016/j.ymssp.2016.12.014_b0010) 2004; 13 Castaings (10.1016/j.ymssp.2016.12.014_b0015) 1996; 100 Booer (10.1016/j.ymssp.2016.12.014_b0090) 1977; 16 Viterbi (10.1016/j.ymssp.2016.12.014_b0040) 1995 Bartoli (10.1016/j.ymssp.2016.12.014_b0075) 2006; 295 Wilcox (10.1016/j.ymssp.2016.12.014_b0100) 2003; 50 De Marchi (10.1016/j.ymssp.2016.12.014_b0030) 2013; 39 Hutchins (10.1016/j.ymssp.2016.12.014_b0065) 2014; 54 Lee (10.1016/j.ymssp.2016.12.014_b0055) 1983; 21 Fu (10.1016/j.ymssp.2016.12.014_b0105) 2014; 61 Caporale (10.1016/j.ymssp.2016.12.014_b0020) 2015 Caporale (10.1016/j.ymssp.2016.12.014_b0085) 2010; 58 Moll (10.1016/j.ymssp.2016.12.014_b0070) 2015; 138 Moll (10.1016/j.ymssp.2016.12.014_b0025) 2012; 331 Sicard (10.1016/j.ymssp.2016.12.014_b0095) 2002; 40 |
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| SubjectTerms | Actuation Actuators Anomalies Decoding Division Gold Lamb wave inspections Lamb waves Laser vibrometry Monitoring systems Piezoelectric transducers Piezoelectricity Signal processing Spread spectrum pulse coding Strategy Transducers Warped frequency transform Wave dispersion Wavelengths Wavenumber filtering |
| Title | A pulse coding and decoding strategy to perform Lamb wave inspections using simultaneously multiple actuators |
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