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对于核发电船而言,考虑到核反应堆的安全性问题,船体结构即使发生破坏,也要保证整体的强度,所以有必要针对破损后的船体梁进行极限强度分析。在船体剩余极限强度分析中,核反应堆舱所处舱段的极限承载能力是整个核发电船极限强度分析的关键。文章研究的重点集中在核反应堆舱段,在该舱段选取危险剖面进行剩余极限强度分析。同时,采用中和轴偏转的Smith方法对反应堆舱段进行破损船体极限强度计算,并结合HCSR规范对其进行评估。根据该核电船作业海域的海况资料,对其遭遇的波浪载荷进行长期极值预报,进而得出该船破损情况下的设计极限弯矩。结果表明,该船的设计极限弯矩满足规范中的要求,为基于规范的特定海域中的特定船型剩余强度评估提供参考。 相似文献
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单舱大开口重吊船是一种能载运杂货、散货、集装箱、重大件货及滚装货,并在舷侧配置大功率吊机的船舶,因其货舱开口大,横舱壁少,一旦主货舱破损进水,残存的可能性很小,而吊机使用时产生的横倾力矩给船舶稳性带来不利影响。为了解决这些问题,我们设计新型的浮箱系统和分舱结构,解决了单舱重吊船因货舱开口大,横舱壁少,一旦主货舱破损进水,残存的可能性很小的问题,提高了在破舱发生时的残存概率。通过对浮箱系统的设计,提高了船舶使用吊机时的船舶的稳性。 相似文献
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降低总纵弯矩的散货船分舱优化设计技术研究 总被引:2,自引:0,他引:2
《舰船科学技术》2015,(8):40-44
梳理了降低总纵弯矩的散货船分舱优化流程。以中船重工船舶设计研究中心有限公司开发设计、山海关船舶重工有限责任公司建造的93 000 DWT散货船作为母型船,进行目标船货舱区分舱方案设计,通过参数化建模,快速建立22种分舱方案。针对每种分舱方案,合理的确定空船重量分布,根据规范要求和船东需求,确定典型装载工况。输出每个载况完整状态和单个货舱破损状态的弯矩剪力信息,统计和比较每种分舱方案的弯矩剪力极值,综合考虑其他性能指标,选定最优方案。通过中垂弯矩的有效控制,避免了弯矩剪力增加引起相关构件尺寸的增大,造成空船重量不必要的额外增加,为适当削减部分构件的尺寸提供条件,为降低空船重量奠定基础。 相似文献
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以3.5万吨散货船实船为例,主要通过SDP规范计算和DSA有限元计算,校核CSR-H对该船结构尺寸和质量的影响。在规范计算方面,主要核算不同工况下的轻货舱、重货舱/风暴压载舱的弯曲强度、剪切强度、极限强度和剩余强度对主要结构尺寸的影响。同时,对重货舱同时兼做风暴压载舱第三货舱的所有区域进行屈服强度评估和屈曲强度评估。 相似文献
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通过构建径向基(Radial Basis Function,RBF)神经网络近似模型,分别采用自适应模拟退火算法(Adaptive Simulated Annealing,ASA)、多岛遗传算法(Multi-Island Genetic Algorithm,MIGA)、粒子群法(Particle Swarm Optimization,PSO)3种优化算法,以重量最轻为目标,对油船整体舱段进行基于CCS规范的优化设计;之后利用Abaqus非线性有限元法计算了轻量化舱段的极限强度,并通过建立极限状态方程,进一步研究优化算法对船体极限强度可靠性的影响;最后,为直观、量化地反映船舶的风险变化程度,通过提出失效概率折减率μ,发现PSO-RBF算法下减重单位舱段重量,船体梁失效概率增加最少。 相似文献
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The alternate hold still-water loading in hogging combined with wave loading is critical for the safe design of bulk carriers. The ultimate longitudinal strength of the hull girder of bulk carriers in this condition has been found to be considerably reduced by the action of local lateral pressure loads. In the present paper, an interaction equation based on the ultimate hull girder strength assessment obtained by nonlinear finite element analyses is adopted to consider the relationship between ultimate longitudinal bending capacity and average external sea pressure over the bottom. This interaction equation is used as the basis for the failure function. The annual probability of failure is obtained by FORM analysis considering two typical load cases, namely, pure longitudinal hogging bending moment and combined global hogging bending moment and local lateral pressure loads. The effect of heavy weather avoidance on the failure probability is evaluated. The results show that the local lateral pressure has a significant influence on the annual probability of failure of bulk carriers in the hogging and alternate hold loading condition. 相似文献
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参照中国船级社《船体结构强度直接计算指南》,对航行于中国沿海海域的77.15m甲板机动货驳的总纵强度进行计算,静水弯矩利用澳大利亚的M axsurf软件进行计算。波浪弯矩根据二维S、T、F线性切片理论进行计算。 相似文献
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船体破损后外载荷与船体极限弯矩 总被引:8,自引:0,他引:8
基于船舶不沉性理论,运用符拉索夫抗沉性计算法确定船舶破损后浮态参数之后,作出波浪上船舶破损浮力曲线,继而计算了波浪弯矩和波浪剪力;并用非对称梁弯曲理论建立了破损模型,将外载荷与破口联系在一起研究了破损船舶极限弯矩,通过实例计算得出了预想结果。 相似文献
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探讨以减小静水弯矩为目标的超大型油船分舱优化方法。建立以横舱壁位置为参变量的参数化分舱模型,编程实现典型工况配载计算;建立基于遗传算法的优化模型,实现在主尺度、船型和货油舱区域总长确定的情况下,以最小静水弯矩为优化目标的货油舱横舱壁位置优化。实际应用结果表明,该方法能快速高效地找到满足强制规范要求的静水弯矩最优的分舱方案。 相似文献
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This is the second of two companion papers dealing with nonlinear finite element modelling and ultimate strength analysis of the hull girder of a bulk carrier under Alternate Hold Loading (AHL) condition. The methodology for nonlinear finite element modelling as well as the ultimate strength results from the nonlinear FE analyses was discussed in the companion paper (Part 1). The purpose of the present paper is to use the FE results to contribute towards developing simplified methods applicable to practical design of ship hulls under combined global and local loads. An important issue is the significant double bottom bending in the empty hold in AHL due to combined global hull girder bending moment and local loads. Therefore, the stress distributions in the double bottom area at different load levels i.e. rule load level and ultimate failure load level are presented in detail. The implication of different design pressures obtained by different rules (CSR-BC rules and DNV rules) on the stress distribution is investigated. Both (partially) heavy cargo AHL and fully loaded cargo AHL are considered. Factors of influence of double bottom bending such as initial imperfections, local loads, stress distribution and failure modes on the hull girder strength are discussed. Simplified procedures for determination of the hull girder strength for bulk carriers under AHL conditions are also discussed in light of the FE analyses. 相似文献
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Assessment of the ultimate longitudinal strength of hull girders under combined waveloads can be of particular importance especially for ships with large deck openings and low torsional rigidity. In such cases the horizontal and torsional moments may approach or exceed the vertical bending moment when a vessel progresses in oblique seas. This paper presents a direct calculation methodology for the evaluation of the ultimate strength of a 10,000 TEU container ship by considering the combined effects of structural non-linearities and steady state wave induced dynamic loads on a mid ship section cargo hold. The strength is evaluated deterministically using non-linear nite element analysis. The design extreme values of principal global wave-induced load components and their combinations in irregular seaways are predicted using a cross-spectral method together with short-term and long-term statistical formulations. Consequently, the margin of safety between the ultimate capacity and the maximum expected moment is established. 相似文献
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裂纹损伤对于船体结构来说难以避免,将削弱结构的极限强度,所以研究含裂纹损伤船体结构的剩余极限强度意义重大.对于含裂纹舱段结构,现有的研究主要针对垂向弯矩作用下的剩余极限强度,对于联合弯矩作用下的研究还很欠缺.本文采用非线性有限元分析方法,研究了垂向弯矩和水平弯矩联合作用下含裂纹舱段的剩余极限强度.提出了计算含裂纹船舯舱段在联合弯矩作用下剩余极限强度的计算公式,通过对含裂纹箱型梁的有限元计算结果进行拟合,得到公式中待定系数的表达式.研究结果表明,本文提出的方法可以快速预测船体结构在联合弯矩作用下的剩余极限强度. 相似文献