基于THAFTS软件考虑地形影响的浮式平台水弹性响应
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摘要
与外海开阔海域的情形不同,浮式平台在岛礁附近布置处最重要的特点就是非均匀的复杂海底地形。文章采用缓变水深条件的浮式结构物水弹性力学分析方法,将海底地形作为固定边界条件,基于THAFTS软件进行浮式平台的三维水弹性运动响应分析,对比研究了不同水深、并考虑复杂地形对浮式平台结构的运动和应力响应的影响。结合短期预报的极值结果确定了设计波参数,并将模态分析的应力和设计波参数进行叠加,得到近岛礁浮式平台的整体应力分布,结果表明在近岛礁布置浮式平台必须考虑非均匀海底地形的影响。
Unlike the open sea, the most important feature of marine environment for the floating platform near the island is the non-uniform complex seabed bottom. In this paper, the hydroelastic analysis method with low variable water depths is used to calculate the responses of the floating structures, considering the sea bed as the boundary condition. Based on the THAFTS software, the three-dimensional hydroelastic motion response analysis of the floating platform is carried out. Considering different water depths and the complex bathymetry, the motion and structural responses of floating platform were compared. The design wave parameters were confirmed by the short-term forecast extreme results, and the whole stress distribution of floating platform structures near the reef was shown plus modal stress by superposition. Finally, the strength evaluation of floating platform indicates that the effect of inhomogeneous bottom topography plays a large role in arrangement of floating platform near reef.
Unlike the open sea, the most important feature of marine environment for the floating platform near the island is the non-uniform complex seabed bottom. In this paper, the hydroelastic analysis method with low variable water depths is used to calculate the responses of the floating structures, considering the sea bed as the boundary condition. Based on the THAFTS software, the three-dimensional hydroelastic motion response analysis of the floating platform is carried out. Considering different water depths and the complex bathymetry, the motion and structural responses of floating platform were compared. The design wave parameters were confirmed by the short-term forecast extreme results, and the whole stress distribution of floating platform structures near the reef was shown plus modal stress by superposition. Finally, the strength evaluation of floating platform indicates that the effect of inhomogeneous bottom topography plays a large role in arrangement of floating platform near reef.
引文
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[2]Dewi F D E,Liapis S I,Plaut R H.Three-dimensional analysis of wave attenuation by a submerged,horizontal,bottommounted,flexible shell[J].Ocean Engineering,1999,26(9):813-839.
[3]Athanassoulis G A,Belibassakis K A.A novel coupled-mode theory with application to hydroelastic analysis of thick,nonuniform floating bodies over general bathymetry[C].Proceedings of the Institution of Mechanical Engineers,Part M:Journal of Engineering for the Maritime Environment,2009,223(2):419-438.
[4]Belibassakis K A,Athanassoulis G A.A coupled-mode model for the hydroelastic analysis of large floating bodies over variable bathymetry regions[J].Journal of Fluid Mechanics,2005,531(3):221-249.
[5]Gerostathis T P,Belibassakis K A,Athanassoulis G A.3D hydroelastic analysis of very large floating bodies over variable bathymetry regions[J].Journal of Ocean Engineering and Marine Energy,2016(2):159-175.
[6]Andrianov A I,Hermans A J.The influence of water depth on the hydroelastic response of a very large floating platform[J].Marine Structures,2003,16(5):355-371.
[7]孙辉,崔维成,刘应中.超大浮体在二维不均匀底部上的水弹性响应[J].上海交通大学学报,2003,37(8):1172-1175.Sun H,Cui W C,Liu Y Z.Hydroelastic response of very large floating structures over 2D variable bottom[J].Journal of Shanghai Jiaotong University,2003,37(8):1172-1175.
[8]Lv H N,Yang J M,Yao M W.Experimental research of the hydroelastic response of box-typed VLFS in non-uniform sea environment[J].Ocean Engineering,2004,22(1):1-8.
[9]Song H,Tao L B,Cui W C,et al.Hydroelastic response of VLFS on uneven sea bottom[C].Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering,OMAE 2005-67557.
[10]Kyoung J H,Hong S Y,Kim B W,et al.Hydroelastic response of a very large floating structure over a variable bottom topography[J].Ocean Engineering,2005,32(17):2040-2052.
[11]Lin P Z.A multiple-layerσ-coordinate model for simulation of wave-structure interaction[J].Computers and Fluids,2006,35(2):147-167.
[12]Buchner B.The motions of a ship on a sloped seabed[C].Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering,OMAE 2006-92321.
[13]Ferreira M D,Newman J N.Diffraction effects and ship motions on an artificial seabed[C].24th International Workshop on Water Waves and Floating Bodies,2009.
[14]Hauteclocque G D,Rezende F,Giorgiutti Y,et al.Wave kinematics and seakeeping calculation with varying bathymetry[C].Proceedings of the 28th International Conference on Ocean,Offshore and Arctic Engineering,OMAE 2009-79517.
[15]Utsunomiya T,Watanabe E,Noguchi T,et al.Hydroelastic analysis of a hybrid-type VLFS in water of variable depth[C].Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering,OMAE 2008-57180.
[16]Pinkster J A.A multi-domain approach in 3D diffraction calculations[C].Proceedings of the 30th International Conference on Ocean,Offshore and Arctic Engineering,OMAE 2011-49414.
[17]Wu Y S,Zou M S,Tian C,et al.Theory and applications of coupled fluid-structure interactions of ships in waves and ocean acoustic environment[J].Journal of Hydrodynamics,2016,28(6):923-936.
[18]Tian C,Ni X Y,Liu X L,et al.Hydroelastic investigation on floating body near islands and reefs[C].Proceedings of the11th International Conference on Hydrodynamics,ICHD 2014.
[19]Tian C,Ni X Y,Ding J,et al.Theoretical study on hydroelastic responses of very large floating structures near islands and reefs[C].Proceedings of the 33rd International Conference on Ocean,Offshore and Arctic Engineering,OMAE 2014-24704.
[20]Yang P,Gu X K,Tian C,et al.Numerical study of 3D pulsating source Green function of finite water depth[C].Proceedings of the 33rd International Conference on Ocean,Offshore and Arctic Engineering,OMAE 2014-24703.
[21]Yang P,Liu X L,Ding J,et al.Hydroelastic responses of a VLFS in the waves influenced by complicated geographic environment[C].7th International Conference on Hydroelasticity in Marine Technology,2015.