长首楼型船的波浪诱导弯矩研究

Study on Wave Induced Bending Moment of the Ships with Long Forecastle

主要研究航行于恶劣海况下,后端壁在船中0.4L范围内的长首楼型船所受的波浪载荷特性。通过对分段龙骨梁船模进行波浪载荷试验测试,结合在时域内基于三维非线性水弹性理论对此船进行数值预报,综合研究长首楼型船所受的波浪载荷特性。研究发现在航速较高、海况较为恶劣时,长首楼型船所受的砰击颤振弯矩显著,甚至在数值上超过了低频波浪弯矩幅值。这对长首楼型船首尾甲板过渡处较弱剖面结构的安全性危胁较大,需要在结构强度评估和设计中给予重视。

The features of wave induced bending moment of the ships with long forecastle,whose aft bulkhead was located between 0.4 L of the vessel,voyaging in the harsh sea were studied in this paper. The purpose above mentioned was achieved by means of wave-load testing based on segmented back-bone model and numerical methods based on3 D non-linear hydro-elastic theory. The results showed that the value of whipping moment resulting from slamming was very large and even surpassed the value of low-frequency wave induced bending moment. The combined wave loads threatened the safety of structures near the transition section of deck between fore part and aft part,which should be taken serious consideration in the assessment and design of structures.