改善209000吨Newcastlemax散货船总纵强度的研究

对209000t Newcastlemax散货船市场和总布置做了简要介绍,通过改变209000t Newcastlemax散货船货舱纵向划分、下墩用途及压载舱舱容,探讨了各种措施下该船型总纵弯矩的变化情况,以此来改善其总纵强度,为优化船体结构、降低空船重量提供了有利条件,并指出总纵强度优化方向,为该课题进一步研究打下基础。     

船体破损后总纵剩余强度预报

阐述采用符拉索夫拉沉性计算方法解决破损船舶总纵强度计算中的外载荷和破损模型等问题。研究破损船舶问题是在不沉性理论基础上进行的。首先从研究在静水中既朋纵倾又有横倾时船舶浮态参数入手，进而研究静置在波浪上的船舶浮态参数、波浪弯矩和波浪剪力。     

散货船总纵强度校核的新要求

基于国际船级社协会发布的统一要求S17提出的单船壳散货船满足任一货舱进水后的船体梁的总纵强度要求。论文根据IACS UR S17介绍了考虑货舱进水后的总纵强度计算方法,通过实船计算阐述了IACS UR S17的生效对营运中散货船总纵强度的影响,并提出了航海人员在散货船强度控制时应注意的问题。旨在提醒航海人员遵照国际规则IACS UR S17加强散货船强度控制,减小营运中存在的风险。     

水面舰船破损后船体总纵强度预报

本文主要述及水面舰船在执行任务过程中遭到损伤,在严重破损状况下舰船船体结构尚存承载能力的探讨。运用常用的极限弯矩强度计算方法对破损后的水面舰船进行程序化的船体总纵强度预报。     

破损船体总纵弯曲强度的修正等值梁法

破损船体破口处存在应力集中,等值梁法不能解决破口应力集中问题。用有限元法研究了船底加筋板格破口的应力分布规律,分析了在矩形、尖角矩形、圆形三种典型破口下的应力集中系数,将破口的应力集中系数分解为平板应力集中系数和骨材作用系数,根据它们的递变规律,提出应力集中系数的一种简化的算法;考虑破口的初始应变和破口进入非弹性阶段后材料的非线性,对破口弹性应力集中系数进行修正并拟合了修正公式;最后提出了采用等值梁法求船底基准应力,结合破口的应力集中系数和破口应力分布规律来计算破损船体总纵强度的方法,对等值梁法的计算结果进行修正,使破损船体强度校核更加真实可靠。算例表明该方法简单可行且具有较好的精度。     

破损舰艇拖航中总纵强度的安全性分析

应用Korvin-Kroukovsky和Jacobs的切片理论分析舰艇在规则波浪扰动情况下垂荡和纵摇运动对破损舰弯矩的影响,计算不同航向航速下破损舰在典型海况中的弯矩值,给出最小弯矩下对应的典型航向航速,适用于救援船舯附近破损的军用舰艇等细长型的大型船舶拖带安全性分析。     

保证大型老超龄固体散货船总纵强度的探讨

此文通过对大型老超龄船舶和固体散装货物特点的分析，结合有关规定和实践中的做法，提出保证该类船舶总纵强度的具体措施。     

改善209000吨Newcastlemax散货船总纵强度的探究

通过对209,000吨Newcastlemax散货船货舱纵向划分、下墩用途及压载舱舱容的调整,探讨了各种措施下该船型总纵弯矩的变化情况,以此来改善其总纵强度,为优化船体结构、降低空船重量提供了有利条件。     

挖泥船破损强度分析研究

对单长泥舱布置的挖泥船进行舱段破损强度分析。应用传统理论方法对船舶破损后的载荷进行计算,根据CCS的《钢质海船入级与建造规范》(2004)计算船舶两种工况的弯矩剪力,通过建立船舶舱段非线性有限元模型,计算舱段的极限强度。对以上三种计算结果进行比较分析,得出相关结论。     

上层建筑对总纵强度的影响的试验研究

通过模型试验，得到了船舶主体及上层建筑的应力分布情况；叙述了上层建筑对总纵强度的影响；分析了该船的最薄弱部位。     

Time-variant ultimate longitudinal strength of corroded bulk carriers

Many bulk carrier losses have been reported of late, and one of the possible causes of such casualties is thought to be the structural failure of aging hulls in rough weather. In aging ships, corrosion and fatigue cracks are the two most important factors affecting structural safety and integrity. This paper uses a set of the time-dependent corrosion wastage models for 23 different member locations/categories of bulk carriers previously developed by the authors, based on the available corrosion measurements for existing large bulk carrier structures. Differences due to the location and corrosion severity of every member type are taken into account. The nominal design corrosion values for the primary members are suggested based on the annualized corrosion rates obtained in the present study. The effect of time-variant corrosion wastage on the ultimate hull girder strength as well as the section moduli is studied. The criteria for repair and maintenance of heavily corroded structural members so as to keep the ultimate longitudinal strength at an acceptable level are discussed. Important insights and conclusions developed are summarized.     

基于协调版共同结构规范的好望角型散货船甲板纵骨疲劳分析

协调版共同结构规范于2015年7月1日正式生效,在制定该规范过程中,散货船甲板纵骨的疲劳评估方法和评估结果受到业界重点关注。文章基于2014版规范要求和2015年发布的修改通报对大型散货船的甲板纵骨进行疲劳强度评估和分析,相关分析结论对结构设计具有指导性意义。     

不同载重量散货船结构形式研究

通过有限元直接计算,对不同载重量散货船要求采用不同结构形式从理论上进行了一定分析说明.具体针对双层底板架, 底边水舱, 以及底墩下纵桁等结构进行分析, 找出热点应力所在之处, 并根据热点应力形成原因, 得出结构形式上的应对方法.     

散货船横向强度有限元分析

利用MSC/Nastran软件探讨了散货船横向强度的计算方法.文中给出了外载荷的计算方法和边界条件的施加方法,并在五种工况下对一散货船进行了横向强度分析.通过有限元分析得到的结论可用于指导散货船的结构设计与优化.计算结果表明结构响应满足强度要求.     

Statistical properties of bulk carrier longitudinal strength

The paper focuses on time-variant longitudinal strength of bulk carriers under corrosion wastage, applying both Taylor series expansion method and Monte Carlo simulation. Hull girder section modulus and ultimate bending moment capacity are determined, by classical beam theory and the commonly applied incremental-iterative approach, respectively. Two main aspects are fully discussed and investigated, according to the final recommendations of last ISSC Report. The former regards the covariance between annual corrosion rates of individual structural members, commonly assumed as uncorrelated. Really, as it is conceivable that a certain correlation exists, three different cases are investigated: uncorrelated variables, fully correlated variables, full correlation between structural members belonging to the same category of compartments. The latter investigates the probability density function of both hull girder section modulus and ultimate bending capacity, because the Central Limit Theorem cannot be applied when correlation among random variables exists. Finally, as a test example, the bulk carrier section, presented in the last ISSC benchmark study, is analysed.     

现役散货船横向构件蚀耗率的概率估算

文章以中散公司现役散货船测厚报告中的数据资料为基础 ,对船体横向构件蚀耗率的数字特征进行了估算。给出了各构件蚀耗率的概率密度曲线、概率分布曲线及超概率分布曲线 ,为散货船船体结构的强度评估和修理提供参考。     

散货船碰撞损伤后的剪切极限强度

船体梁受到碰撞损伤后,必须有足够的剩余强度用以抵抗最大外弯矩,同时还需能够承受最大剪力.在众多类型的船舶中,散货船是一种抗剪能力较差的船型.对于其碰撞损伤后纵向剩余极限弯矩的研究已有较多的文献[2-7],而对于碰撞损伤后的剪切极限强度的研究目前还比较少.针对这一现状,本文的主要目的在于分析讨论散货船受到碰撞损伤后的极限承剪能力;分析结构几何尺寸,碰撞损伤形状以及边界条件等各种因素对碰撞破损船体抗剪能力的影响.为了方便起见,文中也给出了相应的回归经验公式.本文同时还推导了一个船体梁碰撞损伤后的初始屈服剪力计算公式.最后,本文以一艘散货船为例,计算分析其碰撞损伤后的抗剪能力,从中得出一些有益的结论.     

Finite element modelling and strength analysis of hold No. 1 of bulk carriers

Bulk carriers are subject to SOLAS regulations concerning the structural integrity of hold No. 1. SOLAS Chapter XII Regulation 6 mandates that the transverse watertight bulkhead between the two foremost holds and double bottom of the foremost hold shall have sufficient strength to withstand flooding of the first hold. This regulation applies to all single-skin bulk carriers of 150 m in length and upwards constructed before 1 July 1999. IACS provides rules for the construction of these areas of such vessels in order to comply with SOLAS Chapter XII. This paper presents a methodology for modelling hold No. 1 of bulk carriers using finite elements in order to assess the structural integrity of these areas under the loads prescribed by IACS. Results from respective nonlinear analyses using IACS loads are also presented.     

大灵便型散货船永久检验通道的布置优化

永久检验通道(PMA)的生效对船舶设计提出了更严格的要求。为使PMA思想更好地融入船舶设计之中,根据PMA相关要求对大灵便型散货船PMA布置经常出现的缺陷进行分析,同时提出设计优化方案及布置建议。     

双舷壳结构以及UR S25对散货船强度设计的影响

LACS的URS25以及海安会关于双壳散货船的建议对于散货船设计的影响逐渐引人注目，本文从结构强度的角度出发对标题2和标题3进行探讨，初步得到一些有意义的结论。