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Modification Method of Longitudinal Bow Structure for ice-Strengthened Merchant Ship

Journal of Shanghai Jiaotong university(Science) 2022年第3期27卷 298-306页

作者： DING Shifeng ZHOU Li GU Yingjie ZHOU Yajun School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Shanghai rules and Research Institute China Classification SocietyShanghai 200135China

:Merchant ships,which are quite different from icebreakers,usually require the light ice-strengthened bow under the floe-ice *** to ice-class B,requirements of China classification Society(CCS),intermediate frames and thick hull plates are necessary for the ice belt area to resist floe-ice ***,due to the limited space,it is not practical to set so many intermediate longitudinals from manufacture point of *** this paper,a modification method is proposed to solve the problem by maintaining the frame spacing and increasing the plate *** aim is to make sure that the bow owns the equivalent ice-bearing capacity with the original frame *** first,a bulk carrier with ice-class B is used for case *** to the requirements of the ice class rule,a designed ice thickness is used to calculate the ice load acting on the bow area due to the impact of ice *** structural models are presented to perform the strength analysis under ice load,including the out-shell plate model and the longitudinal *** results show that increasing the plate thickness is helpful to remove the negative effect induced by enlarging the spacing of the longitudinal.A reasonable curve is presented to modify the bow for the ice-strengthened merchant ship,which shows the relationship between the increase of plate thickness and the spacing of ***,a model test of floe-ice–ship interaction is conducted to measure the dynamic ice load,based on which nonlinear dynamic FE analysis is used to verify the presented plate-thickness–longitudinal spacing *** results show that the proposed method can be used to improve the ice-strengthened bow structure effectively,which provides theoretical foundation to modify the requirement of CCS’s ice class rule.

关键词： ice-strengthening ice load ice model test nonlinear FE method ice class rule

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