Transient Dynamic Response of Ship Hull
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- Institutt for marin teknikk 
Slamming often occurs in severe sea states particular for high speed vessels, which can cause damage to ship hulls or even equipment on ships. Analysis of transient dynamic response of ship hulls is useful in establishing criterion related to slamming loads and predicting seakeeping behavior of the ship. Thus this thesis is mainly focused on dynamic response of the ship due to slamming loads.Experimental study of the floating structure dynamics can be very expensive. Hence, numerical methods are considered to be very useful for dynamic analysis of the ship. The ship to be analyzed in this work is owned by Wagenborg which is a multi-purpose cargo/container ship. The bench mark committee has provided all the information about the ship and corresponding sea condition. Three-dimensional finite element model is established in Sesam Genie. Hydrodynamic coefficients are computed in Sesam HydroD. The model made in Genie is imported in ABAQUS for dynamic analysis. The material properties, sections, mesh size and load cases are defined in ABAQUS.The introductory part of this thesis gives an overview of slamming phenomenon and reviews of previous literature. The second part of the thesis introduces different types of external loads which act on the ship hull and the response induced by these loads. Slamming load theories are described especially. The third part elaborates dynamic response analysis theories and corresponding analysis methods. The analysis methods used in ANAQUS are also specified in this section. The forth part of the thesis presents details of the finite element modelling of the ship using software Sesam and ABAQUS. Different ship models are established for comparison. The final part presents the results of eigenvalue analysis and dynamic response analysis. Parametric studies are performed in this section. The conclusions are made in the final part.