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Comparison between Field Test and Numerical Analysis for a Jacket Platform in Bohai Bay, China 원문보기

韓國海洋工學會誌 = Journal of ocean engineering and technology, v.20 no.2 = no.69, 2006년, pp.1 - 7  

Yang He-Zhen (Division of Ocean Development Engineering, Korea Maritime University) ,  Park Han-Il (Division of Ocean Development Engineering, Korea Maritime University) ,  Choi Kyung-Sik (Division of Ocean Development Engineering, Korea Maritime University) ,  Li Hua-Jun (College of Engineering, Ocean University of China)

Abstract ▼ AI-Helper 아이콘AI-Helper

This paper, presents a comparison between numerical analysis and field test on a real offshore platform in Bohai Bay, China. This platform is a steel jacket offshore platform with vertical piles. The field testing under wave-induced force and wind force etc. was conducted, in order to obtain the dyn...

주제어

#Jacket platform   #Modal parameters identification   #Dynamic testing   #Modal analysis   #Finite element model   #Vibration   #Structural health monitoring  

AI 본문요약
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제안 방법

  • The correlation between modal parameters identified from the test and those calculated numerically can be evaluated by conearing the values of modes. Table 2 shows the con耳)arisen of the numerically calculated frequencies form the finite element analysis and experimentally identified frequencies from the field ambient vibration tests.
  • The purpose of this research is to apply the available data identify the modal parameters, and compare with analytical modal analysis of a real jacket platform. The modal identification of the jacket platform has been done through ambient vibration measurements.

대상 데이터

  • 2. In order to identify the mode shapes of 난te jacket platform, a total of twenty-one of these sensors have been mounted on the plies and the main legs of the platform respectively.
  • The offshore platform addressed in this paper located at a mean water depth of 11.2 m in Bohai Bay, China. It consists of two decks and four tubular piles penetrating the seabed and a jacket with four main legs which are revised from the temporarily used piling facilities (Huang et al.
  • the equipment used for the tests included accelerometers, signal cables, and a 32<hannel data acquisition system with signal an마ifier and conditioner, as shown in Fig. 3. Accelerometers convert the ambient vibration responses into electrical signal conditioner.

이론/모형

  • It has been shown how the modal parameters can be extracted from ambient vibration data only by using the peak picking method and the natural excitation technique(NExT). The natural excitation technique (NExT) was applied in coreunction with the eigensystem realization algorithm to identify structural modal parameters (natural frequency, damping ratio, mode shape), with limited acceleration information. Analytical work involves the development and modal analysis of a three-dimensional finite element model.
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참고문헌 (12)

  1. Aktan, E., Beck, J. and Cornwell, P. (1999). 'The State of the Art in Structural Identification of Constructed Facilities', Report by the ASCE Committee on Structural Identification of Constructed Facilities 

  2. Farrar, C.R., Doebling, S.W., Cornwell, P.J. and Straser, E.G (1997). 'Variability of Modal Parameters Measured on the Alamosa Canyon Bridge', The 15th International Modal Analysis Conference, Orlando 

  3. Hoon, S., Farrar, C.R., Hemez, F.M., Shunk, D.D., Stinemates, D.W. and Nadler, B.R. (2003). A Review of Structural Health Monitoring Literature; 1996 - 2001, Los Alamos National Laboratory, Los Alamos 

  4. Huang, W.P., Jiang, J.T. and Li, H.J. (2002). 'Measurement of Excessive Vibration of a Jacket Platform'. Proc, of International Symposium on Safety Science and Technology, ISSST, Tai'an, China, Vol 3, pp 502-506 

  5. Li, H.J. and Yang, H.Z. (2004). 'Research Progress on Modal Parameter Identification and Damage Diagnosis for Offshore Platform Structures', Engineering Mechanics, Vol 21, pp 116-138 

  6. James III, G.H., Came, T.G. and Lauffer, J.P. (1993). 'The Natural Excitation Technique (NExT) for Modal Parameter Extraction from Operating Wind Turbines,' SAND92-1666, UC-261, Sandia National Laboratories 

  7. Juang, J.N. and Pappa, R.S. (1985). 'An Eigensystem Realization Algorithm for Modal Parameter Identification and Model Reduction', Journal of Guidance, Control and Dynamics, Vol 8, No 5, pp 620-627 

    상세보기 crossref

  8. Juang, J.N. and Pappa, R.S. (1986). 'Effects of Noise on Modal Parameters Identified by the Eigensystem Realization Algorithm', Journal of Guidance, Control, and Dynamics, Vol 9, No 3, pp 294-303 

    상세보기 crossref

  9. Peeters, B. and De Roeck, G. (1999). 'Reference Based Stochastic Subspace Identification in Civil Engineering', Proc. of the 2nd International Conference on Identification in Engineering System Swansea, pp 639-648 

  10. Peterson, L.D. (1992). 'Efficient Computation of the Eigensystem Realization Algorithm', Proc. of the 10th International Modal Analysis Conference, San Diego, CA, pp 1122-1131 

  11. Pappa, R.S, Elliott, K.B. and Schenk, B. (1993). 'A Consistent-Mode Indicator for the Eigensystem Realization Algorithm', Journal of Guidance, Control and Dynamics, Vol 16, No 5, pp 852-858 

    상세보기 crossref

  12. Yang, H.Z. and Li, H.J. (2003). 'Damage Localization of Offshore Platform under Ambient Excitation', China Ocean Engineering, Vol 17, No 4, pp 307-316 

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