Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping
For the purpose of improving the damage localization accuracy, a prewarping technology is combined with step pulse excitation and this method is used in Lamb wave imaging of plate structures with adjacent damages. Based on the step pulse excitation, various narrowband or burst response can be derive...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2015/185148 |
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| author | Shangchen Fu Lihua Shi Yinghui Zhou Zhikai Fu |
| author_facet | Shangchen Fu Lihua Shi Yinghui Zhou Zhikai Fu |
| author_sort | Shangchen Fu |
| collection | DOAJ |
| description | For the purpose of improving the damage localization accuracy, a prewarping technology is combined with step pulse excitation and this method is used in Lamb wave imaging of plate structures with adjacent damages. Based on the step pulse excitation, various narrowband or burst response can be derived by signal processing technology and this method provides flexibility for further prewarping approach. A narrowband signal warped with a preselected distance is then designed, and the dispersion in the response of this prewarping signal will be greatly reduced. However, in order to calculate the distance for prewarping, the first arrival needs to be estimated from the burst response. From the step-pulse response, narrowband responses at different central frequencies can be obtained, and by averaging peak-value time of their first arrivals, a more accurate estimation can be calculated. By using the prewarping method to the damage scattering signals before imaging, the imaging resolution of the delay-and-sum method can be highly enhanced. The experiment carried out in an aluminum plate with adjacent damages proves the efficiency of this method. |
| format | Article |
| id | doaj-art-09faf7b2ea7d4cd69b34e38f2251f49c |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-09faf7b2ea7d4cd69b34e38f2251f49c2025-02-03T06:42:02ZengWileyShock and Vibration1070-96221875-92032015-01-01201510.1155/2015/185148185148Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and PrewarpingShangchen Fu0Lihua Shi1Yinghui Zhou2Zhikai Fu3National Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, PLA University of Science and Technology, Nanjing, Jiangsu 210007, ChinaNational Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, PLA University of Science and Technology, Nanjing, Jiangsu 210007, ChinaNational Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, PLA University of Science and Technology, Nanjing, Jiangsu 210007, ChinaNational Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, PLA University of Science and Technology, Nanjing, Jiangsu 210007, ChinaFor the purpose of improving the damage localization accuracy, a prewarping technology is combined with step pulse excitation and this method is used in Lamb wave imaging of plate structures with adjacent damages. Based on the step pulse excitation, various narrowband or burst response can be derived by signal processing technology and this method provides flexibility for further prewarping approach. A narrowband signal warped with a preselected distance is then designed, and the dispersion in the response of this prewarping signal will be greatly reduced. However, in order to calculate the distance for prewarping, the first arrival needs to be estimated from the burst response. From the step-pulse response, narrowband responses at different central frequencies can be obtained, and by averaging peak-value time of their first arrivals, a more accurate estimation can be calculated. By using the prewarping method to the damage scattering signals before imaging, the imaging resolution of the delay-and-sum method can be highly enhanced. The experiment carried out in an aluminum plate with adjacent damages proves the efficiency of this method.http://dx.doi.org/10.1155/2015/185148 |
| spellingShingle | Shangchen Fu Lihua Shi Yinghui Zhou Zhikai Fu Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping Shock and Vibration |
| title | Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping |
| title_full | Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping |
| title_fullStr | Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping |
| title_full_unstemmed | Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping |
| title_short | Enhancement of Lamb Wave Imaging Resolution by Step Pulse Excitation and Prewarping |
| title_sort | enhancement of lamb wave imaging resolution by step pulse excitation and prewarping |
| url | http://dx.doi.org/10.1155/2015/185148 |
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