Coarse mesh finite element model for cruise ship global and local vibration analysis

This paper presents a practical procedure for creating finite element (FE) model vibration analysis of cruise ships. The most preferable FE modelling approaches are studied and discussed through case studies common ship structures, which cover the range from low to high frequencies. application homogenized equivalent single layer (ESL) theory based stiffened panel is extended local forced analysis, where inertia induced interaction between plate stiffener occurs. Modal method used with an energy-based correction accounting plate-stiffener into modal properties. Case study results reveal that mesh density one 4-node per web frame spacing suitable global FE-model when limited hull girder modes. For such modes it sufficient only include membrane stiffness panels. investigating response at higher frequencies, bending properties should be included least two elements spacing. Then can performed excellent accuracy up frequencies about third natural stiffeners. Beyond that, influence becomes more significant in vibration, making ESL-theory limited. With applied method, validity ESL-model approximately thirds frequency.