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首页> 外文期刊>International Shipbuilding Progress >Remedy for misalignment of hemispherical head of bilobe cargo tank in liquefied petroleum gas carrier
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Remedy for misalignment of hemispherical head of bilobe cargo tank in liquefied petroleum gas carrier

机译：液化石油气运输船中舱底货舱半球头未对准的补救措施

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摘要

This work describes the remedy for a misalignment at the joint of two segments of hemispherical heads in a bilobe cargo tank. The misalignment is the result of a relatively thin spherical shell and production difficulties. Measurements of out-of-roundness show a rather large deviation of meridional camber and variation of radius in the head cross-section plane. At the ends of the segments the spherical form changes into a conical one. As a result a peak occurs in the meridional generatrix, which causes high stress concentration. The cross-section of the hemisphere at the segment joint is reinforced with a ring in order to overtake the bending moment caused by the variation of circular radius. The ring dimensions are determined based on an approximate consideration. Stress concentration at the segment joint is reduced by two additional rings connected with a set of bars in the meridional direction. Angular distance between the bars is specified in such a way that the strength criteria, i.e. stress and fatigue requirements according to the Classification Rules, are satisfied. Stress distribution in the actual imperfect and reinforced structure is determined by the finite element method. Total static plus dynamic tank pressure is taken into account.
机译：这项工作描述了在bilobe液货舱中半球形头部的两个节段的连接处未对准的补救措施。该未对准是相对薄的球形壳和生产困难的结果。不圆度的测量结果表明子午曲面的弧度偏差较大，并且头部横截面平面中的半径变化较大。在段的末端，球形改变成圆锥形。结果，在子午母线出现一个峰值，这导致了高应力集中。分段接头处的半球横截面用环加固，以克服圆半径变化引起的弯矩。环的尺寸是基于近似考虑确定的。节段接头处的应力集中通过在环向方向上与一组杆相连的两个附加环减小。规定钢筋之间的角距离应满足强度标准，即满足分类规则的应力和疲劳要求。实际的不完善和加固结构中的应力分布是通过有限元方法确定的。总静态加动态油箱压力已考虑在内。

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