DOI QR코드

DOI QR Code

A model experiment of damage detection for offshore jacket platforms based on partial measurement

  • Shi, Xiang (Engineering College, Ocean University of China) ;
  • Li, Hua-Jun (Engineering College, Ocean University of China) ;
  • Yang, Yong-Chun (Engineering College, Ocean University of China) ;
  • Gong, Chen (Engineering College, Ocean University of China)
  • 투고 : 2006.08.28
  • 심사 : 2007.12.27
  • 발행 : 2008.06.20

초록

Noting that damage occurrence of offshore jacket platforms is concentrated in two structural regions that are in the vicinity of still water surface and close to the seabed, a damage detection method by using only partial measurement of vibration in a suspect region was presented in this paper, which can not only locate damaged members but also evaluate damage severities. Then employing an experiment platform model under white-noise ground excitation by shaking table and using modal parameters of the first three modes identified by a scalar-type ARMA method on undamaged and damaged structures, the feasibility of the damage detection method was discussed. Modal parameters from eigenvalue analysis on the structural FEM model were also used to help the discussions. It is demonstrated that the damage detection algorithm is feasible on damage location and severity evaluation for broken slanted braces and it is robust against the errors of baseline FEM model to real structure when the principal errors is formed by difference of modal frequencies. It is also found that Z-value changes of modal shapes also play a role in the precise detection of damage.

키워드

참고문헌

  1. Brincker, R., Kirkegaard, P.H., Andersen, P. and Martinez, M.E. (1995), "Damage detection in an offshore structure", Proc. of the 13th Int. Modal Analysis Conf., Nashville, Tennessee, 661-667
  2. Della Greca, A. (1997), "Offshore facility management: how to render rational the underwater inspection and removal planning", Proc. of the 16th Int. Conf. on Offshore Mechanics and Arctic Engineering, Yokohama, Japan, ASME, II, 251-259
  3. Doebling, S.W., Farrar, C.R. and Prime, M.B. (1998), "A summary review of vibration-based damage identification methods", Shock Vib. Digest, 205(5), 631-645
  4. Fukunaga, K. (1990), Introduction to Statistical Pattern Recognition, Academic Press, New York
  5. Kanazawa, K. and Hirata, K. (2000), "Modal identification for a multi degree of freedom system using cross spectrum method", J. Struct. Constr. Eng., Architectural Inst. Japan, (529), 89-96 (in Japanese)
  6. Kim, J.T. and Stubbs, N. (1995), "Damage detection in offshore jacket structures from limited modal information", Int. J. Offshore Polar Eng., 5(1), 58-66
  7. Kim, J.T. and Stubbs, N. (2002), "Improved damage identification method based on modal information", J. Sound Vib., 252(2), 223-238 https://doi.org/10.1006/jsvi.2001.3749
  8. Kondo, I. and Hamamoto, T. (1994), "Local damage detection of flexible offshore platforms using ambient vibration measurement", Proc. of the 4th Int. Symposium on Offshore and Polar Engineering, Osaka, Japan, IV, 400-407
  9. Mangal, L., Idichandy, V.G. and Ganapathy, C. (2001), "Structural monitoring of offshore platforms using impulse and relaxation response", Ocean Eng., 28(6), 689-705 https://doi.org/10.1016/S0029-8018(00)00018-4
  10. Nichols, J.M. (2003), "Structural health monitoring of offshore structures using ambient excitation", Appl. Ocean Res., 25(3), 101-114 https://doi.org/10.1016/j.apor.2003.08.003
  11. Roesset, J.M. and Yao, J.T.P. (1998), "Applications of structural health monitoring and damage detection to marine systems", Proc. of the Second World Conf. on Structural Control, Kyoto, Japan, 3, 2327-2334
  12. Ruotolo, R., Surace, C. and Worden, K. (2000), "Application of two damage detection techniques to an offshore platform", Shock Vib. Digest, 32(1), 30-31
  13. Sanderson, D.J., Price, A.G., Nelson, A., Thurlbeck, S.D., Killbourn, S. and Dougan, A. (2002), "The applicability of online monitoring for the assurance of fixed jacket structures' structural integrity", Proc. of the Int. Conf. on Offshore Mechanics and Arctic Engineering, OMAE, Oslo, Norway, 3, 589-598
  14. Shi, X., Matsui, T., Mizuno, K. and Ohmori, H. (2005), "Damage detection in offshore jacket platforms based on partial measurement", J. Struct. Constr. Eng., Architectural Inst. Japan, (591), 169-177
  15. Stacey, A. and Sharp, J.V. (1997), "Fatigue damage in offshore structures - causes, detection and repair", BOSS'97 Behaviour of Offshore Structures, Delft, The Netherlands, July, 3, 77-91
  16. Yang, H.Z., Li, H.J. and Wang, S.Q. (2003), "Damage localization of offshore platform under ambient excitation", China Ocean Eng., 17(4), 495-504

피인용 문헌

  1. Reduced wavelet component energy-based approach for damage detection of jacket type offshore platform vol.11, pp.6, 2013, https://doi.org/10.12989/sss.2013.11.6.589
  2. Damage detection in jacket type offshore platforms using modal strain energy vol.33, pp.3, 2009, https://doi.org/10.12989/sem.2009.33.3.325