International Journal of Naval Architecture and Ocean Engineering

  • 제3권1호
  • /
  • Pages.80-85
  • /
  • 2011
  • /
  • 2092-6782(pISSN)
  • /
  • 2092-6790(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
권호 표지
DOI QR코드

DOI QR Code

An assessment of the effect of hull girder vibration on the statistical characteristics of wave loads

  • Ogawa, Yoshitaka (National Maritime Research Institute) ;
  • Takagi, Ken (Dept. of Environmental & Ocean Engineering, The University of Tokyo Chiba)
  • 발행 : 2011.03.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

For the assessment of statistical characteristics of wave loads in the real sea state, the probability distribution of wave loads are computed based on the sufficient duration of computations in irregular waves. First of all, the estimation of wave impact loads is well modified applying the displacement potential formulation, which was proposed by one of authors, for solving Wagner's flow model. Consequently, the present computation method is also modified. Prior to the computation in irregular waves, preliminary computation to determine the adequate number of realization of irregular waves is examined. The effect of hull girder vibration on the statistical characteristics is examined by means of the computation with/without hull girder vibration. It is found that hull girder vibration has a certain effect on the probability of occurrence of wave loads. Furthermore, computations taking account of the effect of operation, that is the effects of ship speed and course change, is conducted for the rational evaluation of the effects of hull girder vibration. It is clarified that the effect of operation on the statistical characteristics of wave loads is significant. It is verified that the evaluation without the effect of operation may overestimate the effect of hull girder vibration.

키워드

참고문헌

  1. Bishop, R.E.D. Price, W.G. and Tam, P.K.Y., 1977. A unified dynamic analysis of ship response to waves, Transaction of Royal Institute of Naval Architects, London, UK. Vol.119, pp.363–390.
  2. Fujino, M. and Chiu, F., 1983. Vertical Motions of High-speed Boats in Head Sea and Wave Load. Journal of the Society of Naval Architecture of Japan, 154, pp. 151–163.
  3. Hamamoto, M. and Kim, Y.S., 1993. A New Coordinate System and the Equations Describing Manoeuvring Motion of Ship in Waves, Journal of the Society of Naval Architecture of Japan, 173, pp. 209–220.
  4. ISSC, 2000. Extreme hull girder loading, special task committee VI.1, 14th international ship and offshore structures congress, Nagasaki, Japan, pp. 263–320.
  5. Jensen, J.J. and Pedersen, P.T., 1979. Wave-induced bending moments in ships - a quadratic theory. Transaction of Royal Institute of Naval Architects, 121, pp.151–165.
  6. Ogawa, Y. Matsunami, R. and Arai, M., 2006. The effect of a bow flare shape on the water impact pressure, International Journal of Offshore and Polar Engineering (IJOPE), 16(2), pp.112-117.
  7. Ogawa, Y., 2007. A study on nonlinear wave loads of a large container carrier in rough seas. 10th Interna-tional Symposium on Practical Design of Ships and other Floating Structures (PRADS), 1, pp.132–140.
  8. Ogawa, Y. Takagi, K., 2009. An evaluation of whip-ping vibration utilizing the displacement potential method, 5th International Conference on Hydroelasticity in Marine Technology, Southampton, UK, pp.213–222.
  9. Ohmatsu, S., 1975. On the Irregular Frequencies in the Theory of Oscillating Bodies in a Free Surface, Papers of Ship Research Institute, Tokyo, Japan, 48, pp 1–13.
  10. Oka, M., Oka, S. and Ogawa, Y., 2009. An experimental study on wave loads of a large container ship and its hydroelastic vibration, Proc. 5th Int. Conf. Hydroelasticity in Marine Technology, Southampton, UK.
  11. Takagi, K. and Ogawa, Y., 2007. Flow Models of the Flare Slamming. Proceedings of International Conference on Violent Flows ,pp. 173-179.
  12. Yamamoto, Y. Fujino, M. and Fukasawa, T., 1980. Motion and longitudinal strength of a ship in head seas and the effects of nonlinearities. Journal of Society of Naval Architects of Japan, Vol. 18. pp. 91-100.