Journal of Korean Society of Coastal and Ocean Engineers (한국해안해양공학회지)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Estimation of Equivalent Hydrodynamic Coefficients by Bean Permutation Technique

보치환법에 의한 등가 유체력계수 산정

  • 박춘군 (한국해양대학교 대학원 해양공학과)
  • Published : 2000.06.01
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Abstract

For on-shore structures, dynamic analysis becomes increasingly important as the water depth increases and the structural configuration becoines slenderer. In this study, an estimation method for equivalent three dimensional (30) hydrodynamic coefficients is introduced as a part of beam permutation technique development. The beam pemlUtation technique is being developed for obtaining an equivalent beam to a frame structure in order to reduce the degrees of freedom and thus the analysis time significantly. Two 3D structures are used in order to verify the obtained equivalent 3D hydrodynamic coefficients. Two commercial softwares, ANSYS and SACS, are used for the verification. The results of the present analysis are found to be satisfactory in comparison with those by the two softwares.

설치수힙이 점차 깊어짐에 따라 해양구조물들의 형상비가 세장해지므로 이에 대한 동적해석이 더욱 중요하다. 해양구조물중에는 프레임구조로 된 것이 많은데 이들의 자유도수가 많아 동적해석에 있어서 많은 계산시간과 컴퓨터 용량이 필요하다. 본 논문에서는 프레임 구조물의 자유도수를 현저히 감소시킬 수 있는 보치환법을 개발하는 이롼으로 동적해석을 수행할 때에 필요한 3차원 등가 유체력계수들을 산정하는 방법을 제시하였다 이 방법을 검증하기 위하여 2가지 모델 예를 사용하였으며 보치환기법에 의한 등가 보의 해석결과와 상용해석 프로그램인 ANSYS과 SACS에 의한 프레임 구조의 해석결과는 아주 만족스럽게 일치하였다.

Keywords

References

  1. Structural Engrg. v.122 no.11 Dynamic analysis of tall building using reduced-order continuum model Chajes, M.J.;Zhang, L;Kirby, J.T.
  2. Hydrodynamics Of Offshore Structures Chakrabarti, S.K.
  3. Applied Mech. Rev. v.41 Continuum modeling for repetititve lattice structures Noor, A.K.
  4. Proc. 39th Workshop on Ocean Engrg. in Korea Three dimensional dynamic analysis of truss type offshore structures Park, H.I.;Piao, C.J.
  5. Dynamics of Offshore Structures Patel, M.H.
  6. Computers and Structures v.12 Modelling aspects for finite element analysis of ship vibration Skaar, K.T.;Carlsen, C.A.
  7. Amer. Int. of Aeronautics and Astronautics J. v.24 no.1 Modeling global structural damping in frames using simple continuum model Sun, C.J.;Juang, J.N.
  8. Proc. 9th Technical Exchange and Advisory Meeting, Team-Hiroshima'95 Dynamic response of superstructure induced by the main engine Weng, W.C.;Fann, G.A.;Hung, C.F.;Li, C.S.
  9. J. Ocean Engrg. and Technology v.13 no.1 A study on the beam permutation technique for frame type offshore structures Piao, C.J.;Park, H.I.