某大型自航耙吸式挖泥船全船结构有限元分析

The Global Structural Finite Element Analysis of a Trailing Suction Hopper Dredger

利用挪威船级社开发的有限元分析软件SESAM对某大型自航耙吸式挖泥船进行全船结构强度分析,研究此类船舶的结构不连续性对其总纵弯曲性能的影响。建立全船有限元模型、面元模型和质量模型,开展水动力分析;基于短期预报结果和长期预报结果确定设计波参数,并完成设计波条件下的全船结构强度分析。研究发现,泥舱段船底蜂窝龙骨(三角舱)的特殊结构加强设计能在很大程度上弥补船底不连续结构导致的刚度减弱。此外,通过对该船型的总纵强度进行分析,结合实际工程应用,提出一些操作规范方面的建议。

This study uses the finite element software SESAM developed by DNV GL in the global structural strength analysis of a large trailing suction hopper dredger to determine the effects of structural discontinuity on the global longitudinal strength. Firstly, the global structural finite element model, the panel model and the mass model are established for the hydrodynamic analysis. Then the design wave parameters based on the short-term and long-term forecast are determined, and the strength analysis of the global structure with the design wave conditions is carried out. The study discovers that the special structure design of the cellular keel at the bottom in the hopper largely compensates for the weakened stiffness caused by the discontinuous structure at the bottom. Moreover, some suggestions on operating specifications combined with practical engineering applications are put forward in this paper based on the analysis of the longitudinal strength.