气球系统锚泊状态动力学仿真

气球系统锚泊状态由气球、左右两侧机械拉索、地面转动梁、气垫组成。风向改变时,气球通过机械拉索带动地面部件一起转动。运用Matlab/Simulink工具箱,可方便的进行系统建模,对气球系统抗风性能进行仿真分析,为气球系统设计与使用提供依据。     

Socketing of polyester fibre ropes with epoxy resins for deep-water mooring applications

The use of polyester (PET) fibre ropes in mooring applications for deep water oil platforms implies the use of terminations, e.g. the spliced eye, which demands specialized manual labour and is time consuming. This research evaluates the technical viability of substituting these terminations with a resin socketing procedure, which consists of introducing a simple-end rope in a hollow metallic device having a conical shape (i.e. a socket) and pouring into it a thermoset resin that, once cured, fastens the rope extremity. PET ropes (10 or 48 mm diameter) were socketed and evaluated under tensile testing. The curing and viscoelastic behaviour of various epoxy resin systems were monitored with DSC and DMA. The performance of socketed PET ropes was suitable for the intended application, showing failure loads similar to those of unsocketed ropes, being particularly dependant on resin type, socket conicity and resin/fibre volumetric ratio in it.     

再论"江枫渔火对愁眠"--与姚振武先生商榷

语法规则往往因文体而异,诗词语法程度远不如散文严格,因而不能用散文语法来规范诗词.对张继<枫桥夜泊>"江枫渔火对愁眠"一句,根据<全唐诗>中的"愁眠"用例以及诗歌用语的特点,并非只可解读为"江枫渔火对着愁眠的人",还可作两种解释对着江枫渔火怀着愁绪而眠;愁人对着江枫渔火而眠.     

在役水上软钢臂式系泊系统风险评价简述

近年来软刚臂式单点系泊系统事故屡有发生,因此,有必要对渤海软刚臂式系泊系统关键风险点进行识别,并对风险点进行相应管控.该文对我国渤海海域软钢臂式系泊系统进行了风险辨识与评价,并对其中若干关键风险点进行了相应的解析,为制定相应的RBI检验策略提供依据.     

基于悬链线理论对系泊系统的优化设计

针对系泊系统设计,对不同海况条件下锚链、钢桶及钢管和浮标进行受力分析,综合使用经典力学、悬链线理论等方法,分别建立系泊系统受力、重物球质量迭代等模型,利用MATLAB编程,得出不同海况下钢桶和各节钢管的倾角、浮标的吃水深度及游动区域、锚链的形状及约束条件下的重物球的质量等结果。     

杜牧《泊秦淮》五种英译文的逻辑功能分析

本文从韩礼德功能语法的逻辑功能角度对杜牧的《泊秦淮》一诗和它的五种英译文作初步的探索,分析小句与小句之间的语义关系是通过语言形式进行体现。虽然不同的译者可能采用不同的翻译方法,但他们对语篇中小句之间的语义关系的把握基本一致。进而表明,对译文进行功能语言分析有益于古诗英译。     

Comparison of linear spring and nonlinear FEM methods in dynamic coupled analysis of floating structure and mooring system

This paper compares the dynamic coupled behavior of floating structure and mooring system in time domain using two numerical methods for the mooring lines such as the linear spring method and the nonlinear FEM (Finite Element Method). In the linear spring method, hydrodynamic coefficients and forces on the floating body are calculated using BEM (Boundary Element Method) and the time domain equation is derived using convolution. The coupled solution is obtained by simply adding the pre-determined spring constants of the mooring lines into the floating body equation. In FEM, the minimum energy principle is applied to formulate the nonlinear dynamic equation of the mooring system with a discrete numerical model. The ground contact model and Morison formula for drag forces are also included in the formulation. The coupled solution is obtained by iteratively solving the floating body equation and the FEM equation of the mooring system. Two example structures such as weathervane ship and semi-submersible structure are analyzed using linear spring and nonlinear FEM methods and the difference of those two methods are presented. By analyzing the cases with or without surge-pitch or sway-roll coupling stiffness of mooring lines in the linear spring method, the effect of coupling stiffness of the mooring system is also discussed.     

海洋石油102YOKE加强环改造影响分析

海洋石油102水上软钢臂式系泊系统在发生YOKE压溃事故后,对其YOKE结构进行了相应的加强,但改造造成的潜在影响尚未明晰.本文从结构强度角度,分析YOKE加强环改造影响,计算结果表明,认为改造后YOKE结构主要影响为由原有的弹性形变占主要作用变为刚性的应力集中占主要作用,改造后的储备强度不完全满足使用要求,应尽快对其进行相应加强.