Title:
IMPROVED METHOD FOR TRANSFORMING FREQUENCY DISPERSION ULTRASONIC GUIDED WAVE SIGNAL DOMAIN
Document Type and Number:
WIPO Patent Application WO/2019/071849
Kind Code:
A1
Abstract:
Provided is an improved method for transforming a frequency dispersion ultrasonic guided wave signal domain, which belongs to the field of ultrasonic guided wave structure health monitoring. The method comprises the following steps: (1) acquiring a dispersion wave number curve and a non-dispersion wave number curve of an ultrasonic guided wave signal mode; (2) calculating an ultrasonic guided wave distance domain excitation waveform with spatial width reduced; (3) calculating an ultrasonic guided wave distance domain pulse response signal; and (4) obtaining, by means of calculation, a non-dispersion ultrasonic guided wave distance domain signal with the resolution enhanced. Compared with a traditional time-distance domain signal transformation method, the present invention further reduces a distance domain width of each wave packet in the ultrasonic guided wave signal by means of changing a distance scale of an excitation waveform, in addition to by means of frequency dispersion compensation and recompression of a frequency dispersion-expanded wave packet in the original ultrasonic guided wave time domain signal, thereby more effectively enhancing the spatial resolution of the original frequency dispersion ultrasonic guided wave signal.
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Inventors:
CAI JIAN (CN)
YUAN SHENFANG (CN)
YUAN SHENFANG (CN)
Application Number:
PCT/CN2017/119826
Publication Date:
April 18, 2019
Filing Date:
December 29, 2017
Export Citation:
Assignee:
UNIV NANJING AERONAUTICS & ASTRONAUTICS (CN)
International Classes:
G01N29/46; B06B1/06; G01N29/04
Foreign References:
| CN102818860A | 2012-12-12 | |||
| JP2007121123A | 2007-05-17 | |||
| JP2010175449A | 2010-08-12 |
Other References:
CAI, JIAN ET AL.: "Lamb Wave High-resolution Damage Imaging Method Based on Non-dispersive Signal Construction", ACTA AERONAUTICA ET ASTRONAUTICA SINICA, vol. 34, no. 8, 8 March 2013 (2013-03-08), pages 1815 - 1823, XP055592424, ISSN: 1000-6893
CAI, JIAN ET AL.: "Lamb Wave Time-Distance Domain Mapping Method Considering Signal Waveform Correction", CHINESE JOURNAL OF SCIENTIFIC INSTRUMENT, vol. 34, no. 5, 31 May 2013 (2013-05-31), pages 1016 - 1021
YUAN, SHENFANG ET AL.: "Monitoring of Crack Propagation in Repaired Structures Based on Characteristics of FBG Sensors Reflecting Spectra", SPECTROSCOPY AND SPECTRAL ANALYSIS, vol. 35, no. 3, 31 March 2015 (2015-03-31), pages 724 - 728, ISSN: 1000-0593
CAI, JIAN: "Lamb Research on Dispersion Compensation Methods in Lamb Wave Damage Imaging", DOCTOR'S THESES, 5 June 2014 (2014-06-05)
CAI, JIAN ET AL.: "Lamb Wave Time-Distance Domain Mapping Method Considering Signal Waveform Correction", CHINESE JOURNAL OF SCIENTIFIC INSTRUMENT, vol. 34, no. 5, 31 May 2013 (2013-05-31), pages 1016 - 1021
YUAN, SHENFANG ET AL.: "Monitoring of Crack Propagation in Repaired Structures Based on Characteristics of FBG Sensors Reflecting Spectra", SPECTROSCOPY AND SPECTRAL ANALYSIS, vol. 35, no. 3, 31 March 2015 (2015-03-31), pages 724 - 728, ISSN: 1000-0593
CAI, JIAN: "Lamb Research on Dispersion Compensation Methods in Lamb Wave Damage Imaging", DOCTOR'S THESES, 5 June 2014 (2014-06-05)
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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