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

机译：粗筛有限元模型，用于游轮全球和局部振动分析

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摘要

This paper presents a practical procedure for creating finite element (FE) model for vibration analysis of cruise ships. The most preferable FE modelling approaches are studied and discussed through case studies of common ship structures, which cover the range from low to high frequencies. The application of homogenized equivalent single layer (ESL) theory based equivalent element for stiffened panel is extended to local forced vibration analysis, where inertia induced interaction between plate and stiffener occurs. Modal method is used with an energy-based correction for accounting the plate-stiffener interaction into modal properties. Case study results reveal that mesh density of one 4-node element per web frame spacing is suitable for global FE-model when vibration analysis is limited to global hull girder modes. For such modes it is sufficient to only include the membrane stiffness of stiffened panels. For investigating the response at higher frequencies, bending properties of stiffened panel should be included and mesh density should be at least two elements per web frame spacing. Then forced vibration analysis can be performed with an excellent accuracy up to frequencies about one third of the local plate natural frequencies between the stiffeners. Beyond that, the influence of the local plate vibration becomes more significant in panel vibration, making the ESL-theory based element limited. With the applied correction method, the validity of the ESL-model can be extended to approximately two thirds of the local plate natural frequency.
机译：本文介绍了为巡航船舶振动分析创建有限元（FE）模型的实用程序。通过对公共船舶结构的情况研究研究和讨论了最优选的FE建模方法，该方法覆盖了低至高频的范围。基于加强板的均匀化等同单层（ESL）理论的应用延伸到局部强制振动分析，其中惯性诱导板和加强筋之间的相互作用发生。模态方法与基于能量的校正一起使用，用于将板加强筋相互作用计入模态性质。案例研究结果表明，当振动分析限于全球船体梁模式时，每个腹板间距的一个4节点元素的网状密度适用于全局FE模型。对于这种模式，仅包括加强面板的膜刚度足够的。为了在较高频率下进行响应，应包括加强面板的弯曲性能，并且网状密度应为每个腹板帧间距至少两个元素。然后可以以优异的精度执行强制振动分析，该精度高于加强筋之间的局部板固有频率的频率约三分之一。除此之外，局部板振动的影响在面板振动中变得更加显着，使得基于ESL-理论的元件有限公司。利用所应用的校正方法，ESL模型的有效性可以扩展到局部板固有频率的大约三分之二。

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