Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

Full Scale Measurement Data Analysis of Large Container Carrier with Hydroelastic Response, Part I - Identification of Modal Parameters

대형 컨테이너 선박의 유탄성 실선 계측 데이터 분석 Part I - 모달 파라미터 추정

  • Kim, Byounghoon (Department of Naval Architecture and Ocean Engineering, INHA University) ;
  • Choi, Byungki (Marine Structure Research Department, Hyundai Heavy Industries, Co., Ltd.) ;
  • Park, Junseok (Marine Structure Research Department, Hyundai Heavy Industries, Co., Ltd.) ;
  • Park, Sunggun (DSME R&D Institute, Daewoo Shipbuilding and Marine Engineering, Co., Ltd.) ;
  • Ki, Hyeokgeun (DSME R&D Institute, Daewoo Shipbuilding and Marine Engineering, Co., Ltd.) ;
  • Kim, Yooil (Department of Naval Architecture and Ocean Engineering, INHA University)
  • 김병훈 (인하대학교 공과대학 조선해양공학과) ;
  • 최병기 (현대중공업 선박구조연구실) ;
  • 박준석 (현대중공업 선박구조연구실) ;
  • 박성건 (대우조선해양 중앙연구원) ;
  • 기혁근 (대우조선해양 중앙연구원) ;
  • 김유일 (인하대학교 공과대학 조선해양공학과)
  • Received : 2017.09.28
  • Accepted : 2017.12.05
  • Published : 2018.02.20
Download PDF
⟨ Previous Next ⟩

Abstract

To understand the dynamic characteristics of the vessel with hydroelastic response, it is very important to estimate the dynamic modal parameters such as mode shapes, natural frequency, and damping ratio. These dynamic modal parameters of full scale ship are a priori unknowns, hence to be estimated directly based upon the full scale measurement data. In this paper, dynamic modal parameters were extracted by signal processing of acceleration and strain data measured from a large container ship whose loading capacity is 9400TEU. The mode shapes of the vibrating hull were identified using the proper orthogonal decomposition and the vibration response of hull was decomposed into its modal magnitudes. Natural frequencies of specific modes were derived via Fourier transform of these modal magnitude. Also, the free decay signal of the vibrating hull was obtained through the random decrement technique and the damping ratio was estimated with accuracy.

Keywords

References

  1. Cole, H.A., 1968. On-The-Line analysis of random vibrations, AIAA Paper No. 68-288.
  2. Cole, H.A., 1971. Method and apparatus for measuring the damping characteristics of a structure. United States Patent No.3, 620,069, Nov.16.
  3. Drummen, I. Wu, M.K. & Moan, T., 2009. Experimental and numerical study of containership responses in severe head seas. Marine Structures, 22, pp.172-193. https://doi.org/10.1016/j.marstruc.2008.08.003
  4. Feeny, B.F., 2002. On proper orthogonal coordinates as indicators of modal activity. Journal of Sound and Vibration, 255, pp.805-817. https://doi.org/10.1006/jsvi.2001.4120
  5. Hirdaris, S.E. Bakkers, N. White, N. & Temarel, P., 2009. Service factor assessment of a great lakes bulk carrier incorporating the effects of hydroelasticity. Marine Technology, 46(2), pp.116-121.
  6. Ibrahim, S.R. & Mikulcik, E.C., 1977. A Method for the direct identification of vibration parameter from the free response. Shock and Vibration Bulletin, 47(4), pp.183-198.
  7. Jensen, J.J., 2009. Stochastic procedures for extreme wave load predictions - wave bending moment in ships. Marine Structures, 22(2), pp.194-208. https://doi.org/10.1016/j.marstruc.2008.08.001
  8. Kim, Y. & Park, S.G., 2013. Wet damping estimation of the segmented hull model using the random decrement technique. Journal of the Society of Naval Architects of Korea, 50(4), pp.217-223. https://doi.org/10.3744/SNAK.2013.50.4.217
  9. Kim, Y. Ahn, I.G. & Park, S.G., 2015. Extraction of the mode shapes of a segmented ship model with hydroelastic response. International Journal of Naval Architecture and Ocean Engineering, 7, pp.979-994. https://doi.org/10.1515/ijnaoe-2015-0068
  10. Lumley, 1970. Stochastic tools in turbulence. Academic Press: New York.
  11. Mariani, R. & Dessi, D., 2012. Analysis of the global bending modes of a floating structure using the proper orthogonal decomposition. Journal of Fluids and Structures, 28, pp.115-134. https://doi.org/10.1016/j.jfluidstructs.2011.11.009
  12. Miyake, R. Matsumoto, T. Yamamoto, N. & Toyoda, K., 2010. On the estimation of hydroelastic response acting on an ultra-large container ship. In: Proceedings of the 20th International Offshore and Polar Engineering Conference, Beijing, China, June 2010, pp.849-856.