协调版共同结构规范对20.6万吨散货船的影响评估

以20.6万吨散货船为例,通过描述性规定与直接强度计算,对比分析协调版共同规范与油船共同规范的差异,评估新规范对目前散货船结构可能带来的影响。     

30 000 t级散货船结构强度有限元分析

依据散货船结构共同规范,采用MSC Patran/Nastran、CCS船级社开发的CSR计算软件CCS-Tools和LR船级社的ShipRight SDA 2007.对30000t级散货船进行了货舱结构的整体有限元分析、高应力区域细化网格有限元分析和疲劳敏感区域精细网格有限元分析.并就所遇问题进行探讨.     

散货船舱口角隅及纵向围板趾端疲劳强度评估及优化

按照CSR BCOT规范(油船和散货船协调共同规范)对某单壳散货船的甲板舱口角隅和纵向舱口围板趾端进行疲劳强度评估及结构形式的多方案比较优化,同时介绍CSR BCOT规范相较之前的CSR-BC规范(散货船共同规范)对散货船甲板舱口角隅强度的影响,供其他结构设计者参考。     

HCSR疲劳筛选计算方法研究

为确定疲劳筛选评估所需的应力放大因子,依据协调共同结构规范(HCSR)疲劳筛选计算方法和流程,结合实例分析疲劳筛选计算中不同节点应力放大因子规范要求的合理性以及疲劳筛选计算结果的合理性,探讨疲劳筛选计算方法对油船和散货船设计的影响程度。     

基于CSR的散货船最首尾货舱结构强度分析

参考散货船共同结构规范要求,研究最首货舱和最尾货舱有限元直接计算的若干要点,包括模型范围和要求、计算载荷和工况的选择和模型处理方法等。探讨共同规范屈服和屈曲强度评估准则,利用MSC Patran/Nastran和英国劳氏船级社(LR)的Shipright软件对某散货船的最首和最尾货舱舱段结构进行强度计算和评估,并提出加强方案,使其满足散货船共同结构规范直接强度分析的要求。     

船舶热点疲劳强度研究

以一艘71 000 t的散货船为研究对象,基于IACS的《散货船共同规范》和CCS的《船体结构疲劳强度指南》,采用热点应力法来进行疲劳强度的评估。对热点疲劳计算的结果进行分析和比较,指出用热点应力法进行疲劳强度评估时的影响因素。     

HCSR疲劳评估中舱壁位移引起的纵骨端部附加应力研究

以3型目标船为样本,通过理论推导和实船计算,对散货船油船协调共同规范(HCSR规范)疲劳简化算法评估中舱壁位移引起纵骨端部附加应力(公式法和系数法)进行分析,结果表明:理论公式法适用于散货船,不适用于油船;油船应采用系数法。     

64000 DWT散货船结构设计分析

随着一方面船东对装货量要求的不断提高,另一方面由于散货船共同结构规范(CSR)的实行,规范对强度要求越来越高,因此,结构布置和设计需更加合理,才能在保证船舶强度的情况下,空船重量更轻,载货量越多。以64 000 DWT散货船为研究对象,对其结构设计要点进行分析,包括合理的结构布置、强度分析、振动分析和重量控制。     

协调版共同结构规范对港口工况下散货船的影响分析

协调版共同结构规范（CSR-H）对港口工况下船体梁强度和船体构件局部强度的要求与先前的油船共同结构规范（CSR-OT）基本一致,而相比散货船共同结构规范（CSR-BC）有明显变化。通过对比分析CSR-H和CSR-BC对于港口工况具体要求的差异,并结合实船数据分析,阐述基于CSR-H要求的港口工况对散货船结构设计的影响;并探讨针对符合CSR-H的散货船,如何合理选取船体梁许用静水弯矩值和许用静水剪力值。     

CCS推出IACS共同结构规范软件

2007年2月6日,中国船级社(CCS)在北京总部举行了“IACS共同规范软件发布会暨共同规范实施推介会”。CCS共同结构规范CSR-SDP软件是CCS工程软件COM-PASS系列中最新组成部分,涵盖了散货船和油船两本规范的结构尺寸要求计算和校核,能满足共同结构规范的船舶设计、审图和计算评估的需要,完全实现了两本共同结构规范的内容,是少数同时开发出油船和单、双舷侧散货船结构规范计算软件的船级社之一。     

27000 DWT化学品/成品油船结构强度直接计算

为了满足双壳油船结构共同规范直接计算的要求,利用MSC Patran/Nastran和中国船级社开发的CSR直接计算软件CCS-Tools,对27 000 DWt化学品/成品油船进行货舱结构的整体有限元分析及高应力区域细化网格有限元分析。     

穿透裂纹薄板拉伸强度影响参数的有限元分析

对穿透裂纹薄板拉伸强度的影响参数进行了有限元分析.分析结果表明,具有穿透裂纹的薄板的拉伸强度受到板的材料屈服强度、泊松比,裂纹长度、开裂角度、开裂位置,板的长宽比、厚度,边界加载条件以及有限元分析网格精度的影响.文中给出了这些因素的影响曲线以及考虑影响参数的穿透裂纹薄板拉伸强度经验计算公式.     

Use of 3D compartment model for simplified full ship FE model. Part I: construction of FE model

Classification societies cannot cover the torsional strength assessment with simple empirical formula as the size of a containership increases drastically over 10 000 TEU in recent years. Torsional strength of a container ship is very difficult to estimate with an analytical method due to its alternatively varying cross sections, i. e. an open and a closed section. This article proposes an approach to construct a simplified FE model using a 3D compartment model available from the beginning of ship design process. The model is cut to pieces of lots of small pieces of lines by a set of transverse, longitudinal and horizontal planes. Two algorithms are developed for mesh generation of internal structures; one for assembling the broken lines into closed loops and the other for automatically generating mesh from the loops. Another algorithm is proposed to generate mesh for outer hull using outermost nodes of the FE model built for internal members. The validity of the simplified model is discussed along with a beam theory based approach in J Mar Sci Technol (2008)     

大开口船波浪载荷长期预报和弯扭强度整船有限元分析

大开口船全船弯扭联合变形与应力的精确计算，必须在整船结构模型上完成。本文以一艘5万吨级大开口船为例，用三维流体动力计算程序进行了波浪随机载荷的长期预报，并在此基础上导出设计波参数组，进而在全船整体结构有限元模型上计算了船体结构在各设计波上的应力分布，并采用嵌入精细舱口角区有限元网络的方法，在整船分析的同时计算出舱口角的应力集中值，获得了船体结构强度的详尽信息。文中阐述了波浪载荷的特点，设计波的确定，浮体完整结构计算的惯性平衡及大开口船的全船计算方法。     

薄膜型LNG船晃荡冲击局部强度分析建模方法研究

为保证薄膜型LNG船(No96型)的营运安全,除绝缘箱外,还有必要对晃荡冲击载荷作用下船体结构进行局部强度分析.考虑到分析对象的不同,同时为了简化有限元模型和降低船体结构局部分析的计算工作量,针对船体结构局部强度分析中绝缘箱建模范围,树脂绳模拟方式以及绝缘箱网格基本尺寸提出了建议并进行了可行性验证.研究表明,建议方法可以在满足计算精度的前提下,极大减少船体结构局部强度分析的工作量,可为晃荡冲击载荷作用下薄膜型LNG船(No96型)船体结构局部强度分析及相关规范制定提供有效的参考.     

Automatic FE modeler using stiffener-based mesh generation algorithm for ship structural analysis

Shipbuilding industries have started to employ 3D CAD systems to integrate all design and production processes by achieving seamless data transfer and data sharing. The emerging 3D CAD system brings a considerable change in FE analysis field. The availability of 3D geometry increased the recognition of the need for developing automatic FE modeling system consequently.

However, general automatic mesh algorithms developed by academic research field have a limitation. The difficulty in satisfying lots of line constraints and the absence of proper idealization of 3D geometry entities defined in CAD system hinders directly employing the general mesh algorithms.

In this research, an automatic FE modeling system has been developed for cargo hold FE modeling and whole ship FE modeling. The basic concept of the algorithm is to decompose surfaces using stiffener lines into subregions and generate mesh using a rule established based on FE modeling practice of ship structure. Since the decomposed subregions take simple polygon, they can be easily transformed into elements by decomposing the polygon according to the rule defined considering the shape of the polygon and mesh seed on its perimeter. The algorithm is also designed to treat appropriate geometry idealizations for bracket-type surface and stiffener connections. The idealization process is also completely customized based on FE modeling practice. The validity of the developed system is verified through illustrative examples.     

船体舱段三维有限元模型参数化建模方法研究

提出三维船体舱段有限元参数化建模的设计方法,将船体舱段的有限元网格归类为纵向网格和横向网格,并分别提出相应的算法以实现这两种网格的自动生成.     

舱口角隅处网格划分方法研究

提出针对舱口角隅处网格的自动有限元精细划分方法,粗细网格使用过渡单元平滑过渡,自动创建规范要求的几种导角和开孔,并对部分筋单元进行板元化.     

Coarse mesh finite element model for cruise ship global and local vibration analysis

This paper presents a practical procedure for creating finite element (FE) model for vibration analysis of cruise ships. The most preferable FE modelling approaches are studied and discussed through case studies of common ship structures, which cover the range from low to high frequencies. The application of homogenized equivalent single layer (ESL) theory based equivalent element for stiffened panel is extended to local forced vibration analysis, where inertia induced interaction between plate and stiffener occurs. Modal method is used with an energy-based correction for accounting the plate-stiffener interaction into modal properties. Case study results reveal that mesh density of one 4-node element per web frame spacing is suitable for global FE-model when vibration analysis is limited to global hull girder modes. For such modes it is sufficient to only include the membrane stiffness of stiffened panels. For investigating the response at higher frequencies, bending properties of stiffened panel should be included and mesh density should be at least two elements per web frame spacing. Then forced vibration analysis can be performed with an excellent accuracy up to frequencies about one third of the local plate natural frequencies between the stiffeners. Beyond that, the influence of the local plate vibration becomes more significant in panel vibration, making the ESL-theory based element limited. With the applied correction method, the validity of the ESL-model can be extended to approximately two thirds of the local plate natural frequency.     

82000dwt散货船结构强度有限元分析

为优化升级主流船型,对82000dwt散货船作了船体结构强度的有限元分析。首先根据2005年美国船级社规范,评估母型船的结构强度。其次根据散货船共同结构规范2008版及2009版,对开发的新船型进行了货舱结构的整体有限元分析和疲劳敏感区域精细网格有限元分析。计算结果表明,母型船的结构强度满足旧的规范要求,新船型的结构需要进行加强,新规范的修订有利于船舶结构设计的优化。