38m双体甲板货船总体结构强度有限元分析

利用MSC／PATRAN、MSC／NASTRAN对38In双体甲板货船总体结构强度进行了有限元强度计算。给出了外载荷的计算方法和边界条件的施加方法,并在11种工况下对38m双体甲板货船进行了总体结构强度有限元分析。通过有限元分析得到的结论可用于双体甲板货船设计与优化。计算结果表明结构强度满足强度要求。     

汽车渡船机舱局部强度直接计算方法研究

汽车渡船作为车辆过江、过海主要交通工具,在内河和海上得到了广泛的应用.船舶机舱往往跨度大,甲板结构需要通过支柱来支撑,车辆载荷作用于机舱结构上,构件上产生复杂的应力分布.文中运用MSC.Patran/MSC.Nastran软件对机舱区域结构进行有限元分析,并对计算结果分析,验证构件强度满足使用需要,此方法适用于渡船机舱强度校核.     

汽车搬运船顶升式活动甲板的设计与安装调试

主要介绍大型汽车搬运船顶升式活动甲板设计注意事项和安装调试技巧.考虑到船舶能满足不同尺度的车辆运载的需要,活动甲板已在现代大型汽车专运船PCC被广泛采用.船体结构比较复杂,活动甲板的划分相对比较困难,在既定的载荷条件下要保证甲板具有一定的强度和刚度,同时单块甲板的重量受到顶升车和下层甲板允许载荷的限制,活动甲板的结构与...     

14000t甲板驳船船体结构局部强度校核

以14 000 t甲板驳船为研究对象,按照设计图纸,使用MSC.Patran有限元软件建立全船有限元模型,取用强度标准,根据该船实际装载3种不同长度和重量的桥梁,定义3种工况进行局部强度校核。计算结果表明,原设计的甲板驳船结构构件,除了甲板纵桁和横梁外,强度都满足规范要求。作者提出了局部结构强度加强方案,校核结果表明该方案可行,建议采取该方案施工。     

110m趸船结构强度分析及加强方案的模糊综合评判

利用MSC.Nastran软件对110m趸船在三种不同工况下进行有限元强度评估.在甲板结构不满足强度要求的情况下,对甲板结构提出三种加强方案,基于模糊综合评判理论,将船体强度、工艺性和经济性等因素作为评判参数,按成对比较法确定各参数的权重系数,构建满意度函数,对110m趸船甲板结构的三种加强方案进行模糊综合评判,确定出最优方案.     

关于汽车运输船刚性设计与柔性设计的强度比较分析

在汽车运输船的设计中,一般存在刚性设计和柔性设计这两种思路。刚性设计较传统,但近年来也有汽车运输船采用柔性设计的。文中以一艘5 000车的汽车运输船为例,分别进行了刚性设计和柔性设计的舱段有限元分析,以比较两种设计在结构强度方面的特点,并对柔性设计的支柱与甲板强框相交处的结构进行了细化和疲劳分析,为今后汽车运输船的设计提供有价值的参考。     

中型邮船甲板薄板分段吊装方案

以中型邮船的3种典型甲板薄板分段为例，设计相应吊装方案，探讨起吊设备在整个吊运过程中影响建造效率的因素。采用有限元分析方法，计算3种薄板分段在不同工况条件下的强度和变形，并对发生超大变形的分段提出临时加强方案。结果表明，该吊装方案适用于甲板薄板分段结构强度弱的特点，满足中国船级社（CCS）吊装规范要求，可使中型邮船甲板薄板分段的吊装作业更加便捷和高效。     

单/双壳体潜艇结构耐撞剩余强度特性研究

单/双圆柱壳体结构是潜艇的两种典型结构形式.以单/双壳体潜艇典型结构为研究对象,分别设计初始深水静压强度相当的典型单/双耐压环肋圆柱壳体结构模型,基于MSC/Dytran罚函数接触算法,开展相同撞击强度载荷作用下结构模型耐撞动态响应特性分析,提取撞击后结构模型中耐压壳体结构的稳定变形位移场,作为MSC/Marc静强度求...     

4590车位汽车运输船结构设计中的几个问题

本文通过对４５９０车位汽车运输船实船结构设计的介绍,初步探讨阳汽车运输船结构强度中存在的问题及其解决方法。其中包括初步设计时船体静水弯矩确定,纵向构件的局部载荷取法、船体骨架形式的选定、高强度钢应用、车辆甲板桁材系统设计以及风管处甲板开口的加强等。本文还着重介绍了一种船体处于歪斜状态下的疲劳问题的简化计算方法、供船体结构初步设计时应用。     

多用途船甲板舱口角隅疲劳强度分析

以5 000 DWT多用途船为例,按照中国船级社《集装箱船结构强度直接计算指南》对多用途船的甲板舱口角隅局部结构进行了疲劳强度评估。基于设计波法对多用途船的载荷进行长期预报并确定设计波参数,利用有限元软件MSC.Patran建立了有限元模型,对12个设计波下的有限元模型进行了分析。计算结果表明,本方法对多用途船大开口甲板舱口角隅处的结构设计具有一定的实用意义和参考价值。     

On board measurement of stresses and deflections of a Post-Panamax containership and its feedback to rational design

One of the most important points in structural design of containerships is the strength of hatch corners. Formerly, hatch corners used to be assessed by combining the component induced by hull girder vertical bending and the component induced by hull girder torsion. In the design of new generation containerships without deck girders, the effect of cross deck fore-aft deflection has also become prominent.Another point is the impact of structural displacement on the deck fittings. About new generation ships, large fore-aft deflection of cross decks raised the new problem of interference of hatch covers, lashing bridges and other deck fittings.To cope with such problems, comprehensive analysis has been carried out during the design stage of a Post-Panamax containership. In parallel with this analysis, on-board measurement had been conducted for 3 years after delivery, in order to confirm wide varieties of structural reaction of a large container ship in seaways. Procedure to derive components of stress and deformations from selected measurement points was developed, and actual values were calculated based on actual measurement.From long-term prediction of each component, it was found that design assumption was in general appropriate. However, regarding the fore-aft deflection of cross deck strip, actual stack load is generally much smaller than the design value, and the resulting predicted extreme value was much smaller than design assumption. This factor should be taken into account in the design stage.Regarding the correlation between hull girder vertical bending and fore-aft deflection of cross deck strip, design assumption of full combination is too conservative. From the measurement, no explicit correlation was observed. Regarding the correlation between hull girder vertical bending and wave induced torsion, design assumption of no correlation was appropriate. From these results, new formulae to combine these three deflection modes were proposed.Whipping was observed in the measured data, indicating that more careful attention should be paid to avoid large stress concentration in deck area to enhance fatigue strength.     

A comparative study on the hull strength of a ship with thin-walled box girders

1 Introduction1 The permanent aim is that the ship designers try to optimize the ship structure to improve the strength of hull. The traditional design of ship structure avoiding damage is involved with many transverse bulkheads set up in the ship in orde…     

自航绞吸挖泥船全船结构强度和总振动特性评估

绞吸挖泥船有着不同于常规船型的结构特点,其首尾均有很大的开槽来设置桥架和台车。主甲板上的大开口以及放置在船体上的复杂工程设备会使其在结构强度、变形和振动特性等方面不同于常规船舶。通过建立一艘自航绞吸挖泥船的全船结构和桥架结构的有限元模型,对全船结构在航行及工作状态下的总强度以及总振动特性进行了分析和研究,以期对该类型船舶的设计提供参考和依据。     

甲板运输船艏部舱段有限元强度分析

考虑甲板运输船的甲板相对较宽,容易导致尺度比超出规范的限定,因此其强度分析应该特殊考虑.利用有限元分析软件MSC.Patran/Nastran建立舱段有限元模型,对甲板运输船的艏部舱段在总纵外载荷、外部水压力和甲板局部载荷作用下的强度进行直接计算和分析.     

薄膜型LNG船全船结构屈服和疲劳强度分析

以某薄膜型液化天然气（Liquefied Natural Gas,LNG）船的结构设计为例,开展全船屈服强度校核和基于精细网格的有限元疲劳强度分析。针对5种典型装载状态,基于美国船级社（American Bureau of Shipping,ABS）全船强度直接计算指南,采用ABS-DLA/SFA系列软件,用三维波浪载荷预报程序对波浪随机载荷进行长期预报。基于预报结果,针对每种装载状态计算15个设计波参数组,求解全船结构在各载荷组合工况下的应力分布,继而完成屈服强度校核。以甲板机械室与穹顶甲板相交处的关键节点区域的节点设计为例开展细网格局部强度分析,并通过各种改进设计解决应力集中问题。针对2种常用典型操作装载状态及营运于北大西洋海区疲劳寿命满足40a的要求,基于ABS全船疲劳强度直接计算指南计算2个典型细化位置热点应力传递函数,通过谱分析得到疲劳累积损伤和疲劳寿命,完成疲劳强度校核。采用的全船强度和疲劳分析方法和思路适用于其他超大型船舶的结构分析。     

客滚船车辆甲板疲劳强度评估

针对《船体结构疲劳强度指南》中关于疲劳强度的分析不适用于客滚船车辆甲板疲劳强度评估的情况,参照《钢桥疲劳设计》,制定出一种适用于车辆甲板疲劳强度的计算方法,以期为内河船车辆甲板的设计与审图提供借鉴。     

Design method for steel deck plates under quasi-static patch loads with allowable plastic deformations

Plastic deformation of plates in steel deck structures under heavy vehicle or helicopter wheel loads is common in ships and offshore structures, and is therefore of significant interest to designers of ro-ro/cargo ships, helicopter-carrying ships and offshore platforms. To provide insight into the plastic deformation of plates, the nonlinear elasto-plastic response of stiffened steel plates loaded quasi-statically by a central rigid rectangular indenter is investigated both experimentally and numerically. The numerically-determined stiffened plate permanent deflections compare well with those obtained experimentally. The concept of applying the elasto-plastic method to the design of deck plates under wheel patch loads is introduced, and the design principle of wheel patch loaded plating is studied together with the design criteria. A simple design formula to determine plating thickness is proposed based on an acceptable level of permanent set. Ship-mounted helideck plating design cases are given to illustrate the elasto-plastic method, and comparisons are made between the thicknesses derived using the proposed design formula and those found from Lloyd's Register (LR), Bureau Veritas (BV) and DNV-GL rule requirements.     

舰船主体结构流体冲击响应主动控制方法和分析

本文以探索性的方式提出了一种有效降低高速舰船主体结构流体冲击瞬态响应的主动最优控制方法,讨论了最优控制原理、观测器和作动器的设计,建立了一套舰船主体结构流体冲击瞬态响应控制仿真系统。通过对一艘实船的仿真分析给出了一些有理论和实际意义的结论。     

全船有限元简化方法在总纵强度计算中的应用

采用全船有限元总强度计算的简化方法,阐述了具有长上层建筑、大开口、全通甲板的船舶在垂向弯矩作用下的总强度应力分布情况,提出了非常规结构船舶总强度计算方法,分析了上层建筑参与总强度的有效度。对有效避免波浪载荷及平衡力计算带来的总强度计算误差和庞大的计算工作量,缩短计算周期以及优化结构等提供指导。     

MSC.1/Circular.1352对装载集装箱船舶设计的影响

CSS Code修正案MSC.1/Circular.1352即将生效。2015年1月1日之后建造的,在甲板上装载集装箱的船舶需要满足此要求。分析了此修正案的具体要求和对装载集装箱船舶货物操作通道设计的影响。