长甲板室端部应力集中分析及优选设计研究

针对长甲板室纵向围壁端部与主船体露天甲板交界处的应力集中问题,采用结构有限元数值分析方法,探讨在空间布置受到限制的条件下,应力集中交界处圆弧型肘板臂长、圆弧半径等参数变化对应力分布和大小的影响,并得到降低应力集中系数的圆弧型肘板参数的最佳值。文中根据研究结果,对某艘实船的长甲板室纵向围壁端部与主船体露天甲板交界处圆弧型肘板进行优选设计,有效地降低了该处的应力集中水平。     

深水钻井船屈服与屈曲强度评估研究

本文依托于上海振华重工深水钻井船研发项目,根据ABS船级社的钻井船规范对钻井船开展研究,总结出钻井船屈服与屈曲强度评估流程,研发了相应的计算程序解决该方面的分析问题,并利用某油船的数据验证了本文相应流程及程序的合理性,相关研究结论,具有工程指导重要意义。     

海水塔结构强度分析

提出独立海水塔结构的有限元计算分析方法,运用SACS软件对某自升式风电安装平台的独立海水塔式提升系统的结构进行建模分析,对该桁架式结构在工作工况和拖航工况时的结构强度进行校核,并采用谱疲劳分析方法对该海水塔结构进行疲劳强度分析及评估。本文的方法和结论可为类似海水塔结构的设计、强度计算及校核提供参考。     

Load distribution on the hull-leg connection components of a jack-up

The jacking pinions and rack chocks of the fixation system of a jack-up sustain tremendous load in the elevated condition, especially when there exists a remarkable non-uniformity of the load distribution. Failures of these structural components may lead to disastrous consequence of the jack-up. Despite the importance of these components, it is difficult to give an accurate prediction of the load distribution on these components in engineering application due to the complex nonlinear interaction mechanism, which is influenced by the relative stiffness of the components, leg-guide clearance and backlash. Previous studies mainly focus on the global performance of the jack-up and pay little attention to the load distribution on the pinions and chocks. The strength of the jacking system is often guaranteed by the manufacturer for an estimate load level, which brings in uncertainty to the safety of the jack-up. The characteristics of the hull-leg interaction are discussed in this paper, and a simplified method using gap elements is proposed. The nonlinear structural analyses are carried out for a specific jack-up using the proposed method and the three-dimensional finite element method(FEM) with contact algorithm. The proposed method is proved accurate and effective for the engineering application. The characteristics of the load distribution of the specific jack-up are discussed, and the conclusions are presented.