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预测规则波浪中船舶运动和载荷的频域三维计算机程序
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作者 Arash Abbasnia Serge Sutulo C.Guedes Soares 《哈尔滨工程大学学报(英文版)》 CSCD 2024年第1期64-73,共10页
The development of an in-house computer program for determining the motions and loads of advancing ships through sea waves in the frequency domain,is described in this paper.The code is based on the potential flow for... The development of an in-house computer program for determining the motions and loads of advancing ships through sea waves in the frequency domain,is described in this paper.The code is based on the potential flow formulation and originates from a double-body code enhanced with the regular part of the velocity potential computed using the pulsing source Green function.The code is fully developed in C++language with extensive use of the object-oriented paradigm.The code is capable of estimating the excitation and inertial radiation loads or arbitrary incoming wave frequencies and incidence angles.The hydrodynamic responses such as hydrodynamic coefficients,ship motions,the vertical shear force and the vertical bending moment are estimated.A benchmark container ship and an LNG carrier are selected for testing and validating the computer code.The obtained results are compared with the available experimental data which demonstrate the acceptable compliance for the zero speed whereas there are some discrepancies over the range of frequencies for the advancing ship in different heading angles. 展开更多
关键词 Frequency domain Advancing ships Diffraction theory Pulsing green’s function Boundary integral equation
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Computation of Ship Hydrodynamic Interaction Forces in Restricted Waters using Potential Theory 被引量:8
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作者 Xueqian Zhou Serge Sutulo C. Guedes Soares 《Journal of Marine Science and Application》 2012年第3期265-275,共11页
A computer code based on the double-body potential flow model and the classic source panel method has been developed to study various problems of hydrodynamic interaction between ships and other objects with solid bou... A computer code based on the double-body potential flow model and the classic source panel method has been developed to study various problems of hydrodynamic interaction between ships and other objects with solid boundaries including the seabed. A peculiarity of the proposed implementation is the application of the so-called "moving-patch" method for simulating steady boundaries of large extensions. The method is based on an assumption that at any moment just the part of the boundary ("moving patch") which lies close to the interacting ship is significant for the near-field interaction. For a specific case of the fiat bottom, comparative computations were performed to determine optimal dimensions of the patch and of the constituting panels based on the trade-off between acceptable accuracy and reasonable efficiency. The method was applied to estimate the sway force on a ship hull moving obliquely across a dredged channel. The method was validated for a case of ship-to-ship interaction when tank data were available. This study also contains a description of a newly developed spline approximation algorithm necessary for creating consistent discretizations of ship hulls with various degrees of refinement. 展开更多
关键词 ship hydrodynamic interaction restricted waters moving panelled patch method potential theory
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Fatigue Life and Integrity of Ships and Offshore Structures
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作者 C.Guedes Soares 《Journal of Marine Science and Application》 CSCD 2022年第4期1-2,共2页
The assessment of the fatigue life of floating structures is an essential step in their design process,and thus it is included as one of the checks in the Rules of Classification Societies.Different methods have been ... The assessment of the fatigue life of floating structures is an essential step in their design process,and thus it is included as one of the checks in the Rules of Classification Societies.Different methods have been developed for that purpose,and new approaches are continuously being proposed,as simplified methods dully calibrated and validated or very heavy computational approaches.Integrity of these structures has to be ensured during their lifetime by checking their strength in light of existing cracks,eventually coexisting with other types of structural degradation.This special issue addresses this type of problems. 展开更多
关键词 FATIGUE STRENGTH eventually
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编者按
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作者 C.Guedes Soares 《哈尔滨工程大学学报(英文版)》 CSCD 2023年第4期659-661,共3页
The need to reduce the trends associated with climate change imposes measures to reduce the emissions of greenhouse gases to the atmosphere and increase the efficiency of the use of energy.The International Maritime O... The need to reduce the trends associated with climate change imposes measures to reduce the emissions of greenhouse gases to the atmosphere and increase the efficiency of the use of energy.The International Maritime Organization(IMO)has been active since 1997 in promoting the implementation of measures that lead to more efficient ship operation with less fuel consumption and less emissions(Tadros et al.,2023a).The measures include improved ship design and improved operational practices.Several indexes have been created to quantify different aspects of these improvements.The shipping industry has been very actively implementing several actions aiming at the decarbonization of ship operation and more need to continue being implemented. 展开更多
关键词 measures GASES CONTINUE
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散货船与桥墩碰撞力的经验公式与数值模拟对比研究 被引量:18
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作者 潘晋 姜伟 许明财 《振动与冲击》 EI CSCD 北大核心 2012年第19期123-127,共5页
介绍了目前几种常见的船桥碰撞力估算公式,并采用这些公式分别计算了四艘三峡标准散货船在各种航速下撞击桥墩的碰撞力。根据三峡标准散货船的设计图纸建立船体有限元模型,通过数值模拟计算了不同吨级、船速下的船桥碰撞力曲线。在桥梁... 介绍了目前几种常见的船桥碰撞力估算公式,并采用这些公式分别计算了四艘三峡标准散货船在各种航速下撞击桥墩的碰撞力。根据三峡标准散货船的设计图纸建立船体有限元模型,通过数值模拟计算了不同吨级、船速下的船桥碰撞力曲线。在桥梁设计时,该曲线可以为该类船舶一桥墩碰撞力计算及评估提供参考。结合经验公式的推导过程,通过船桥碰撞力经验公式与有限元数值仿真分析计算结果表明,铁路桥涵设计规范的船桥碰撞力公式更适合于斜艏500至3 000 t级散货船,而美国公路桥梁设计规范的船桥撞击力计算公式对该类型吨级船舶的碰撞力结果偏大。 展开更多
关键词 桥梁 碰撞力 有限元 防撞 船舶
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桥梁防船撞钢套箱的碰撞力快速估算 被引量:17
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作者 潘晋 张敏 许明财 《振动与冲击》 EI CSCD 北大核心 2014年第8期66-71,共6页
研究船舶与单墩桥梁防撞钢套箱艏尖舱的碰撞过程,探讨碰撞力快速估算及防撞装置模块化设计的可行性。首先采用非线性有限元方法模拟1 000吨级三峡标准散货船与钢套箱式桥梁防船撞装置的碰撞过程,分析了防撞钢套箱艏尖舱在不同的斜边角... 研究船舶与单墩桥梁防撞钢套箱艏尖舱的碰撞过程,探讨碰撞力快速估算及防撞装置模块化设计的可行性。首先采用非线性有限元方法模拟1 000吨级三峡标准散货船与钢套箱式桥梁防船撞装置的碰撞过程,分析了防撞钢套箱艏尖舱在不同的斜边角和船舶碰撞速度下的能量吸收特性以及传递至桥墩的碰撞力特性,得到的结果可为防撞钢套箱外形的选择提供参考。对所选择的防撞钢套箱形式,采用Boltzmann函数拟合了撞击船速与桥梁所受横桥向及顺桥向碰撞力之间的关系,该拟合公式可以用于此类防撞钢套箱方案设计阶段的撞击力快速估算。 展开更多
关键词 船舶 桥梁 碰撞力 防撞钢套箱 有限元方法
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Fatigue Reliability Assessment of Correlated Welded Web-frame Joints 被引量:3
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作者 W.Huang Y.Garbatov C.Guedes Soares 《Journal of Marine Science and Application》 2014年第1期23-31,共9页
The objective of this work is to analyze the fatigue reliability of complex welded structures composed of multiple web-frame joints, accounting for correlation effects. A three-dimensional finite element model using t... The objective of this work is to analyze the fatigue reliability of complex welded structures composed of multiple web-frame joints, accounting for correlation effects. A three-dimensional finite element model using the 20-node solid elements is generated. A linear elastic finite element analysis was performed, hotspot stresses in a web-frame joint were analyzed and fatigue damage was quantified employing the S-N approach. The statistical descriptors of the fatigue life of a non-correlated web-frame joint containing several critical hotspots were estimated. The fatigue reliability of a web-frame joint wasmodeled as a series system of correlated components using the Ditlevsen bounds. The fatigue reliability of the entire welded structure with multiple web-frame joints, modeled as a parallel system of non-correlated web-frame joints was also calculated. 展开更多
关键词 fatigue reliability hotspot stress S-N approach finite element analysis web-frame joints
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Ultimate Strength Assessment of a Tanker Hull Based on Experimentally Developed Master Curves 被引量:1
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作者 Mingcai Xu Y. Garbatov C. Guedes Soares 《Journal of Marine Science and Application》 2013年第2期127-139,共13页
A geometrically similar scaling was made from small-scale specimen to full-scale stiffened panels and then their collapse behaviour is investigated. It is considered that the stiffened panel compressive ultimate stren... A geometrically similar scaling was made from small-scale specimen to full-scale stiffened panels and then their collapse behaviour is investigated. It is considered that the stiffened panel compressive ultimate strength test was designed according to geometrical scaling laws so that the output of the test could be used as representative of the stiffened panels of the compressive zone of a tanker hull subjected to vertical bending moment. The ultimate strength of a tanker hull is analysed by a FE analysis using the experimentally developed master stress-strain curves which are obtained by the beam tension test and the compressive test of the stiffened panel, and are then compared with the result achieved by the progressive collapse method. 展开更多
关键词 ship hull tanker hull stiffened panel ultimate strength scaling laws similitude analysis
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Fatigue Reliability of Deck Structures Subjected to Correlated Crack Growth
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作者 G.Q.Feng Y.Garbatov C.Guedes Soares 《Journal of Marine Science and Application》 2013年第4期413-421,共9页
The objective of this work is to analyse fatigue reliability of deck structures subjected to correlated crack growth.The stress intensity factors of the correlated cracks are obtained by finite element analysis and ba... The objective of this work is to analyse fatigue reliability of deck structures subjected to correlated crack growth.The stress intensity factors of the correlated cracks are obtained by finite element analysis and based on which the geometry correction functions are derived.The Monte Carlo simulations are applied to predict the statistical descriptors of correlated cracks based on the Paris-Erdogan equation.A probabilistic model of crack growth as a function of time is used to analyse the fatigue reliability of deck structures accounting for the crack propagation correlation.A deck structure is modelled as a series system of stiffened panels,where a stiffened panel is regarded as a parallel system composed of plates and are longitudinal.It has been proven that the method developed here can be conveniently applied to perform the fatigue reliability assessment of structures subjected to correlated crack growth. 展开更多
关键词 CRACK growth FATIGUE reliability DECK STRUCTURES correlation stiffened PANEL
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Numerical Investigation on the Ultimate Strength of Box Beams with Impact Damage
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作者 Wei Xu C.Guedes Soares 《Journal of Marine Science and Application》 CSCD 2020年第4期705-716,共12页
The objective of this paper is to study the residual ultimate strength of box beams with impact-induced damage,as a model of what may occur in ship hulls.The bottom and side plates of ship hulls can suffer denting or ... The objective of this paper is to study the residual ultimate strength of box beams with impact-induced damage,as a model of what may occur in ship hulls.The bottom and side plates of ship hulls can suffer denting or fracture damage due to grounding,collision and other contacts during the ship’s service life and these impact-induced damages could result in considerable strength degradation.Box beams are firstly subjected to impact loading and then four-point bending loading is imposed on the damaged structures to assess the residual strength using ANSYS/LS_DYNA.The ultimate moment and collapse modes are discussed considering the effect of impact location.The impact-induced deformation is introduced in the four-point bending simulation,and the impact-induced stress is included or not to determine the effect of residual stress and distortion after impact.It is shown that impact location has significant influence on the residual ultimate bending moment of the damaged box beam providing that the impact energy is kept constant.The collapse modes also change when the impactor strikes on different locations.Damaged hard corner and inclined neutral axes might explain the reduction of ultimate strength and diverse collapse modes.The residual stress in the box beam after impact may increase or decrease the ultimate strength depending on impact location. 展开更多
关键词 Impact tolerance Box beam Four-point bending Ultimate moment Impact location
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