独立液货舱支撑结构是该型船的重要构件,起到连接船体结构和液货舱/灌的作用,实现力的传递、变形的传递、热的传递等功能。本文基于当前常见的独立液货舱（单罐和双耳罐）支撑结构设计形式,分析热传递过程的作用和方式,研究环境条件的传热模拟（空气对流）,分别提出适用于独立液货舱支撑结构和甲板罐支撑结构的温度场分析方法,可作为液化天然气（LNG）运输船和LNG燃料动力船罐体支撑结构温度场分析的参考。

针对传统光滑粒子流体动力学(SPH)无法准确定义雷诺数问题，引入亚粒子尺度技术(SPS)对流体黏性进行处理，开发了SPS-δ-SPH算法．分别采用人工黏性、层流黏性和SPS湍流黏性的处理方法对不同雷诺数下的二维圆柱绕流进行数值模拟，分析不同黏性处理方法下的水动力系数的变化并与相关文献结果进行比较．结果表明：SPS湍流模型在较低雷诺数下的升阻力计算结果与实验值较为接近，且在较高雷诺数下有效可靠，SPS-δ-SPH算法适用于黏性绕流问题．在此基础上，将SPS-δ-SPH算法进一步应用于穿透自由液面的三维圆柱绕流问题并得到了较高精度的计算结果．研究结果对解决海洋工程领域的相关问题具有参考价值．

针对传统光滑粒子动力学（SPH）无法准确定义雷诺数问题，通过引入亚粒子尺度技术（Sub-Particle Scale，SPS）对流体黏性进行处理，自主开发了SPS-δ-SPH算法．分别采用人工黏性、层流黏性和SPS湍流黏性的处理方法对对不同雷诺数下的二维圆柱绕流进行数值模拟，系统分析不同黏性处理方法下的水动力系数的变化并与相关文献的计算结果的进行比较．结果表明：在较低雷诺数下SPS湍流模型的升阻力计算结果与实验值较为接近且在较高雷诺数下有效可靠，SPS-δ-SPH算法适用于黏性绕流问题．在此基础上，将SPS-δ-SPH算法进一步应用于穿透自由液面的三维圆柱绕流问题并得到了较高精度的计算结果，对解决海洋工程领域的相关问题具有很大的参考价值．

随着大型集装箱船的发展,斜浪条件下的扭矩载荷特性及其结构响应日益重要。以某大型集装箱船为研究对象,建立水动力湿表面计算模型和质量模型,研究基于扭矩传递函数和主要载荷控制参数的斜浪设计波参数确定方法,分析不同超越概率水平下扭矩计算值的规律。考虑典型斜浪参数和超越概率水平,分析水动力计算扭矩与船舶规范（ABS和HCSR）扭矩的差异及原因,提出集装箱船扭矩载荷计算与应用的建议。通过计算45°,60°和75°斜浪条件下的船体结构应力云图,识别斜浪作用下船体结构响应的关键位置,可作为大型集装箱船结构设计过程中船体梁扭转强度计算、舱口角隅设计、抗扭箱强度评估等的参考。

冰区航行船舶螺旋桨会与碎冰发生碰撞，产生的冰载荷对螺旋桨的危害较大。本文模拟冰锥与刚体碰撞试验以验证计算方法的可行性，基于ALE算法的流固耦合分析方法对不同冰层厚度、密集度以及螺旋桨进速的冰桨碰撞进行研究。研究发现，冰载荷与冰厚基本呈正相关性，冰厚大于0.75 m时，冰载荷成连续分布且最大值增长迅速。冰载荷平均值与冰区密集度呈递增关系，最大值与密集度不呈递增关系，当密集度大于7/10时，冰载荷影响剧烈。螺旋桨进速越大，冰载荷越大，进速大于1.5 m/s时，冰载荷增长迅速。通过冰桨数值模拟分析，为实际船舶螺旋桨在碎冰区航行提供参考。

Inland waterway (IWW) shipping is a sustainable opportunity to reduce traffic on, in many times very congested, roads and railways. This is especially true for cities and urban areas. However, for an operator, the ship Oper-ation Time Window (OTW) is important in order to predict possible business cases, especially for regions with long-term winter seasons with icy conditions. The OTW indicates the probable number of navigable days for the ship. The operability is in relation with ship speed, ice thickness, whereas the ship resistance is of significant relevance. This study proposes a model to investigate the possibility of a certain operating condition for ice-going ships based on an Artificial Neural Network (ANN) model and a statistical model. To demonstrate the proposed method for calculating the ship OTW of an IWW, a case study is performed. Ice condition in Lake Ma center dot laren (in Sweden) and an IWW ship designed to maximise its dimension restrictions are used for this case. The Radial Basis Function-Particle swarm optimization (RBF-PSO) ANN model is used to predict ice resistance in level ice con-ditions. Given the ice resistance prediction, a statistical analysis is further conducted regarding to the ice thickness distribution and the operational ship speed distribution to obtain ship OTW. Comparisons are made between semi-empirical ice resistance prediction methods and the ANN model. The influence of different ship speed distribution profiles is investigated by performing a parametric study. The OTW model can be used to evaluate ship operational scenarios in ice-covered waters for ship designers and owners.

The identification and digitization of floating ice are of great significance to developing numerical ice load model of ships and marine structures in managed ice fields. The circumferential crack method is a commonly-used method to simulate the level ice breaking process for a polar ship. The crack size, including radius and open -angle, is an import parameter that should be considered in the analysis of ice-structure interactions. It is usu-ally determined by the empirical formulas, which may introduce many uncertainties in the selection of input parameters. In this paper, we adopt a deep learning YOLACT model to identify broken ice blocks from an image, where an image processing algorithm is newly developed to estimate circumferential crack size for each iden-tified ice blocks. The numerical simulation shows that the accuracy of the radius and open-angle estimated by the present method can reach up to 97.37% and 96.66%, respectively. The present tool could be used to assist design and operations for marine structures in ice-infested waters.

[目的]旨在研究船舶靠泊时“船体-护舷-码头”的动态耦合作用。[方法]采用非线性有限元方法,建立舷侧与护舷结构有限元模型,模拟船舶靠泊过程中速度、应力、能量的动态演化过程。[结果]结果表明:护舷与码头接触最紧密时,船舶速度降为零

Cavitation greatly affects the ice blockage performance of propellers in polar areas, while the combined effect of cavitation and ice blockage on propellers has rarely been considered. In this work, the propeller model test in the cavitation tunnel and the viscous flow CFD numerical simulation based on RANS were conducted. In the cavitation tunnel test, the ice blockage model was simulated by a water-insoluble rectangular solid block, and the ice blockage was measured by the distance between the solid block and the propeller. The thrust and torque in tests and simulations were discussed under the uniform flow and ice blockage scenarios, as well as the variation of cavitation excitation force, pressure distribution of blades, cavitation characteristics and vortex intensity with advance coefficient when sigma(n) = 1.5, L/D = 0.15 in an ice blockage environment. The research shows that the numerical simulation results based on overlapping grids are in good agreement with the model test results, and the mean hydrodynamic errors are within 5%. In the uniform flow test, when the advance coefficient is small, the thrust and torque of the propeller will experience a sharp drop due to the influence of heavy cavitation. In the ice blockage test, the thrust and torque increase with the decrease of ice-propeller spacing, and the ice blockage becomes more serious as the cavitation grows. The propeller oscillates violently due to the cavitation excitation force, and the oscillation frequency increases with the increase of the advance coefficient. The cavitation is generated in the low-pressure area of the suction surface, and the cavitation shape captured in the present numerical simulation is consistent with the experimental phenomenon. Since the cavitation reduces the contact area between the water and the blade, the vortex strength will be reduced for the attachment of cavitation, and the vortex strength increases with the increase of the advance coefficient. This study will explore more hydrodynamic regularities with ice-class propellers in an ice blockage environment when cavitation occurrs, and provide technical support for the design of propellers of polar ships.