Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Damage Evaluation of a Framed Structure Using Wavelet Packet Transform

웨이블렛펙킷 변환을 이용한 프레임 구조물의 건전성 평가

  • 김한상 (삼성엔지니어링 토목건축팀)
  • Received : 2006.09.18
  • Published : 2007.05.30
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Abstract

This paper evaluates the soundness of structural elements using Wavelet Packet Transform (WPT). WPT is applied to the response acceleration of a framed structure which is subjected to earthquake load to decompose the response acceleration, then the energy of each component is calculated. The first five largest components in energy magnitude among the decomposed components are selected as input to an ANN to identify the damage location and severity. Two nodes in output layer yield damaged element and damage severity respectively. This method successfully evaluates the amount of damage and its location in the structure.

본 논문에서는 구조물의 건전성 평가를 위하여 지진하중을 받은 프레임 구조물의 응답 가속도를 웨이블렛펙킷 변환(Wavelet Packet Transform; WPT)을 이용하여 분해한 후 인공신경망을 이용하여 각 부재의 손상도를 평가하였다. 인공신경망에는 응답가속도의 분해된 성분 중 에너지가 가장 큰 5개의 성분이 입력 값으로 사용 되었는데 인공신경망의 출력층에 있는 2개의 노드는 각각 손상된 부재와 손상도를 나타낸다. 이 논문에서 제시된 방법을 이용하여 구조물의 손상된 부재와 손상도를 평가하였고 만족스러운 결과를 얻었다.

Keywords

References

  1. Doebling, S. W., Farrar, C. R., Prime, M. B., and Shevitz, D. W., "Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review." Rep. LA-13070-MS, UC-900, Los Alamos National Laboratory, NM, 1996,
  2. Rytter, A., "Vibration based inspection of civil engineering structures." Ph.D. Dissertation. Aalborg University, Denmark, 1993.
  3. Newland, D. E., An introduction to random vibrations, spectral & wavelet Analysis 3rd ed, Longman Scientific & Technical, Essex, England, 1993.
  4. Newland, D. E., "Wavelet analysis of vibration Part 1: Theory." J. Vibration and Acoustics, 116, 1994, pp.409-416. https://doi.org/10.1115/1.2930443
  5. Newland, D. E., "Wavelet analysis of vibration Part 2: Wavelet Maps." J. Vibration and Acoustics, 116, 1994, pp.417-424. https://doi.org/10.1115/1.2930444
  6. Al-khalidy, A., Noori, M., Hou, Z., Yamamoto, S., Masuda, A., and Sone, A., "Health monitoring systems of linear structures using wavelet analysis." International Workshop on Structural Health Monitoring. 1997, pp.164-175.
  7. Al-khalidy, A., Noori, M., Hou, Z., Carmona, R., Yamamoto, S., Masuda, A., and Sone, A. "A study of health monitoring systems of linear structures using wavelet analysis." ASME PVP 347, 1997, pp.49-58.
  8. Kitada, Y., "Identification of nonlinear structural dynamic systems using wavelets." Journal of Engrg.Mech., 124(10), 1998, pp.1059-1066. https://doi.org/10.1061/(ASCE)0733-9399(1998)124:10(1059)
  9. Hou, Z., Noori, M., and Amand, R.S., "Wavelet-based approach for structural damage detection." J. Engrg. Mech., 126(7), 2000, pp.677-683. https://doi.org/10.1061/(ASCE)0733-9399(2000)126:7(677)
  10. Sun Z, & Chang C C, "Structural Damage Assessment Based on Wavelet Packet Transform," Journal of Structural Engineering, ASCE, Vol. 128, No 10, 2002, pp.1354-1361. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:10(1354)
  11. Mallat S. A wavelet tour of signal processing. New York: Academic Press; 1998.