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Journal of Mechanical Science and Technology

, Volume 32, Issue 11, pp 5213–5221 | Cite as

Optimization of excitation frequency and guided wave mode in acoustic wavenumber spectroscopy for shallow wall-thinning defect detection

  • Seongin Moon
  • To Kang
  • Soon-Woo Han
  • Jun-Young Jeon
  • Gyuhae Park
Article
  • 8 Downloads

Abstract

In plate-like structures, wall-thinning defects resulting from corrosion may not be accompanied by any indication of damage on the surface. Thus, inspections are required to ensure that wall-thinning defects are within allowable limits. However, conventional ultrasonic techniques require physical contact to the structure. Alternatively, acoustic wavenumber spectroscopy (AWS) may be used for detecting, locating, and characterizing defects. This paper describes the performance of AWS in the estimation of a wall-thinning defect size in thinplate structures using finite element analysis (FEA). Through a series of FEAs, the structure’s steady-state response to a single-tone ultrasonic excitation is simulated, and the wall-thinning defect-size effect on the wavenumber-estimation accuracy is investigated. In general, the A0 guided wave mode is widely used to visualize defects because of the nature of the wave speed variation in relation to the plate thickness. However, it is not appropriate for the detection of relatively shallow wall-thinning defects, because the rate of change in wave speed with the thickness decreases with increasing plate thickness. To overcome this limitation, we propose a method to optimize excitation frequency and effective guided wave mode instead of utilizing the A0 mode. The results can be used to determine the size of shallow wall-thinning defects in plate-like structures.

Keywords

Nondestructive testing Ultrasonic guided wave Acoustic wavenumber spectroscopy Finite element analysis Ultrasonic wavefield imaging 

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References

  1. [1]
    C. C. Chia, H. M. Jeong, J. R. Lee and G. Park, Composite aircraft debonding visualization by laser ultrasonic scanning excitation and integrated piezoelectric sensing, Structural Control and Health Monitoring, 19 (2012) 605–620.CrossRefGoogle Scholar
  2. [2]
    J. R. Lee, C. C. Chia, C. Y. Park and H. Jeong, Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Algorithm, Optics & Laser Technology, 44 (2012) 1507–1515.CrossRefGoogle Scholar
  3. [3]
    J. R. Lee, S. Y. Chong, N. Sunuwar and C. Y. Park, Repeat scanning technology for laser ultrasonic propagation imaging, Measurement Science and Technology, 24 (2013) 085201.CrossRefGoogle Scholar
  4. [4]
    H. M. Jeong, J. R. Lee and C. I. Park, Advances in hardware of ultrasonic propagation imaging system, Journal of the Korean Society for Nondestructive Testing, 32 (2012) 214–219.CrossRefGoogle Scholar
  5. [5]
    Y. Choi and J. R. Lee, Dual–energy wave subtraction imaging for damage detection in ultrasonic propagation imaging system, 2016 IEEE Aerospace Conference (2016).Google Scholar
  6. [6]
    J. E. Michaels, Ultrasonic wavefield imaging: research tool or emerging NDE method?, 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, 36 (2017).Google Scholar
  7. [7]
    K. S. Alguri, J. E. Michaels and J. B. Harley, Robust baseline subtraction for ultrasonic full wavefield analysis, 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, 36 (2017).CrossRefGoogle Scholar
  8. [8]
    E. B. Flynn, Embedded multi–tone ultrasonic excitation and continuous–scanning laser doppler vibrometry for rapid and remote imaging of structural defects, 7th European Workshop on Structural Health Monitoring (2014).Google Scholar
  9. [9]
    E. B. Flynn, S. Y. Chong, G. J. Jarmer and J. R. Lee, Structural imaging through local wavenumber estimation of guided waves, NDT & E International, 59 (2013) 1–10.CrossRefGoogle Scholar
  10. [10]
    J. Y. Jeon, S. Gang, G. Park, E. Flynn, T. Kang and S. W. Han, Damage detection on composite structures with standing wave excitation and wavenumber analysis, Advanced Composite Materials, 26 (2017) 53–65.CrossRefGoogle Scholar
  11. [11]
    D. Goodman, K. Rowland, S. Smith, K. Miller and E. Flynn, Non–destructive examination of multiphase material distribution in uranium hexafluoride cylinders using steadystate laser Doppler vibrometery, Wicks A. (Eds), Structural Health Monitoring, Conference Proceedings of the Society for Experimental Mechanics Series, Springer, Cham, 5 (2014).Google Scholar
  12. [12]
    E. Flynn, A. Haugh and S. Lopez, Small defect detection through local analysis of acoustic spatial wavenumber, 9th International Workshop on Structural Health Monitoring (2015).CrossRefGoogle Scholar
  13. [13]
    E. Flynn and G. Jarmer, Hight–speed Non–contact baselinefree imaging of hidden defects using scanning laser measurements of steady state ultrasonic vibration, 9th International Workshop on Structural Health Monitoring (2013) 123–136.Google Scholar
  14. [14]
    S. H. Kang, J. Y. Jeon, D. H. Kim, G. Park, T. Kang and S. W. Han, Damage detection on thin–walled structures utilizing laser scanning and standing waves, Transactions of the Korean Society of Mechanical Engineers A, 41 (5) (2017) 401–407.Google Scholar
  15. [15]
    E. A. C. Koskelo and E. B. Flynn, Full–field inspection of three–dimensional structures using steady–state acoustic wavenumber spectroscopy, 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, 36 (2017).CrossRefGoogle Scholar
  16. [16]
    T. C. Truong and J. R. Lee, Thickness reconstruction of nuclear power plant pipes with flow–accelerated corrosion damage using laser ultrasonic wavenumber imaging, Structural Health Monitoring (2017).Google Scholar
  17. [17]
    N. M. O’Dowd, D. H. Han, L. H. Kang and E. B. Flynn, Exploring performance limits of full–field acoustic wavenumber spectroscopy techniques for damage detection through numerical simulation, 8th European Workshop on Structural Health Monitoring (2016).Google Scholar
  18. [18]
    M. B. Drozdz, Efficient finite element modeling of ultrasound waves in elastic media, Ph.D. Thesis, Imperial College of Science Technology and Medicine (2008).Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Seongin Moon
    • 1
  • To Kang
    • 1
  • Soon-Woo Han
    • 1
  • Jun-Young Jeon
    • 2
  • Gyuhae Park
    • 2
  1. 1.Korea Atomic Energy Research InstituteDaejeonKorea
  2. 2.Chonnam National UniversityGwangjuKorea

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