船舶进水应急风险评估DCEFM模型（英文）

This paper proposes a risk assessment model considering danger zone, capsizing time, and evaluation time factors(DCEFM)to quantify the emergency risk of ship inflow and calculate the degree of different factors to the emergency risk of water inflow. The DCEFM model divides the water inflow risk factors into danger zone, capsizing time, and evacuation time factors. The danger zone, capsizing time, and evacuation factors are calculated on the basis of damage stability probability,the numerical sim...     

船体结构最优风险评估维护计划（英文）

Various structures such as marine structures age over time. In order to always maintain safety conditions, maintenance processes including inspection and repair should be implemented on them. Corrosion and fatigue cracks are two main factors that reduce the ultimate strength of the ship's hull girder over time and thus increase the probability and risk of failure. At the time of inspection,the structural conditions must be checked so that, if necessary, the required repairs can be done on it. The main objective of this paper is to provide optimized maintenance plans of the ship structure based on probabilistic concepts with regard to corrosion and fatigue cracks. Maintenance activities increase the operational costs of ships; therefore, it is advisable to inspect and repair in the optimal times. Optimal maintenance planning of the ship structure can be conducted by formulating and solving a multi-objective optimization problem. The use of risk as a structural performance indicator has become more common in recent years. The objective functions of the optimization problem include minimizing the structure's lifecycle maintenance costs, including inspection and repair costs, and also minimizing the maximum risk of structural failure during the ship's life. In the following,to achieve better responses, reliability index has been added to the problem as the third objective function. The multi-objective optimization problem is solved using genetic algorithms. The proposed risk-based approach is applied to the hull structure of a tanker ship.     

北婆罗洲海域导管架平台海啸风险评估（英文）

This work details the simulation of tsunami waves generated by seaquakes in the Manila Trench and their effect on fixed oil and gas jacket platforms in waters offshore North Borneo. For this study, a four-leg living quarter jacket platform located in a water depth of 63 m is modelled in SACS v5.3. Malaysia has traditionally been perceived to be safe from the hazards of earthquakes and tsunamis. Local design practices tend to neglect tsunami waves and include no such provisions. In 2004, a 9.3Mw seaquake occurred off the northwest coast of Aceh, which generated tsunami waves that caused destruction in Malaysia totalling US$ 25 million and 68 deaths. This event prompted an awareness of the need to study the reliability of fixed offshore platforms scattered throughout Malaysian waters. In this paper, we present a review of research on the seismicity of the Manila Trench, which is perceived to be high risk for Southeast Asia. From the tsunami numerical model TUNA-M2, we extract computer-simulated tsunami waves at prescribed grid points in the vicinity of the platforms in the region. Using wave heights as input, we simulate the tsunami using SACS v5.3 structural analysis software of offshore platforms, which is widely accepted by the industry. We employ the nonlinear solitary wave theory in our tsunami loading calculations for the platforms, and formulate a platform-specific risk quantification system. We then perform an intensive structural sensitivity analysis and derive a corresponding platform-specific risk rating model.     

基于有限元的球面型尾轴承性能研究（英文）

球面型尾轴承是将关节轴承与普通水润滑尾轴承综合而成的一种复合轴承,通过关节轴承自动调心作用可减小由螺旋桨引起的"边缘效应",增大尾轴与尾轴承的接触面积,降低最大接触压力,改善润滑性能。文章应用ANSYS中有限元方法,对球面型尾轴承进行了建模仿真分析和对比,结果表明:球面尾轴承可以增加尾轴与尾轴承的接触面积,使得接触压力分布更加均匀。与普通尾轴承相比,最大接触压力降低22%,刚度也得到减小。文中的有限元仿真可为球面型轴承在船舶轴系上的应用提供理论依据。     

基于支持向量机的舰船建造预付款风险评估

舰船建造项目的规模和复杂性日益增大,预付款风险也得到了军方的日益重视.针对传统风险评估方法的不足,应用基于支持向量机的模型进行舰船建造预付款风险评估.建立了预付款风险评估指标体系,将支持向量机方法与BP神经网络方法进行对比,结果显示支持向量机可以很好的应用于风险评估.评估结果可供预付款管理决策时参考.     

基于Star-CCM+的摆式波浪能装置水动力性能研究（英文）

A two-dimensional numerical Computational Fluid Dynamics(CFD) model is established on the basis of viscous CFD theory to investigate the motion response and power absorption performance of a bottom-hinged flap-type wave energy converter(WEC)under regular wave conditions. The convergence study of mesh size and time step is performed to ensure that wave height and motion response are sufficiently accurate. Wave height results reveal that the attenuation of wave height along the wave tank is less than 5% only if the suitable mesh size and time step are selected. The model proposed in this work is verified against published experimental and numerical models. The effects of mechanical damping, wave height, wave frequency, and water depth on the motion response, power generation, and energy conversion efficiency of the flap-type WEC are investigated. The selection of the appropriate mechanical damping of the WEC is crucial for the optimal extraction of wave power. The optimal mechanical damping can be readily predicted by using potential flow theory. It can then be verified by applying CFD numerical results. In addition, the motion response and the energy conversion efficiency of the WEC decrease as the incident wave height increases because the strengthened nonlinear effect of waves intensifies energy loss. Moreover, the energy conversion efficiency of the WEC decreases with increasing water depth and remains constant as the water depth reaches a critical value. Therefore, the selection of the optimal parameters during the design process is necessary to ensure that the WEC exhibits the maximum energy conversion efficiency.     

基于概率风险评估的舰船装备研制风险分析与决策

随着数字化造船技术的发展,在舰船装备研制过程中,对定量风险分析的需求越来越强烈。针对我国舰船装备系统复杂、研制周期长的特点,本文提出了一种基于全寿命周期数据管理（PLM/PDM）系统的风险管理和决策支持系统。并结合概率风险分析方法与定性风险分析方法在船舶系统应用的特点,在风险数据收集、风险模型和风险知识库建立及完善等几个方面进行了深入分析。     

表面粗糙度对水面舰船粘性阻力分量影响的数值研究（英文）

Recently, computational fluid dynamics(CFD) approaches have been effectively used by researchers to calculate the resistance characteristics of ships that have rough outer surfaces. These approaches are mainly based on modifying wall functions using experimentally pre-determined roughness functions. Although several recent studies have shown that CFD can be an effective tool to calculate resistance components of ships for different roughness conditions, most of these studies were performed using...     

舰船隐身设计技术（4）

简单形状这一条件的成立需要几个潜在的前提条件。首先，需要选用恰当的方法，正确地利用麦克斯韦电磁方程式求解，然后得到所期望的正确值。类似这种简单形状的物体，几乎在各种场合都能见到。     

舰船隐身设计技术（3）

物理光学(PO)理论克服了根据平面和单一曲面求出的解所存在的缺陷，它是通过对感应到的表面场进行近似和积分计算而求出散射场解。由于感应到的场有限，因此散射场也有限。     

基于比例伪时序算法的舰船电力风险评估系统

[目的]为了提高舰船电力系统的安全性与稳定性,提出基于比例伪时序算法的风险评估系统.[方法]在舰船电力系统中引入改进的伪时序算法,对电压、功率和频率等电力模拟量进行赋值,并通过组态界面进行可视化监控,进而对舰船电力系统进行整体风险评估.同时,针对不同工况下的系统拓扑结构变化问题,通过引入比例补偿系数来调整算法,从而提高...     

舰船隐身设计技术（5）

所谓“电波吸收体”，是指具有吸收一定电磁能的性质，同时能反射低于100％的入射能量的物质或材料。电波吸收体的“性能”是指某一铺在金属板上形成平面层状的电波吸收体反射的能量与该金属板反射的能量之比。其反射系数用dB表示如下：     

船舶操纵性能及其代理模型构建（英文）

为了提高船舶操纵性能计算效率,文章结合基于NAPA计算仿真结果和支持向量回归方法预报海洋平台支援船的操纵性能,在收集足够相关船型信息前提下,采用能够合理探索设计空间和抽样的拉丁超立方方法获取了30条样本船型数据。通过NAPA仿射变化、位移转换及根据船型设计变量进行局部调整从而生成系列船型以表达船体几何形状。针对每个船型,分别计算了5项操纵性衡准指标:进距、战术直径、横距、10°舵角第一超越角和20°舵角第一超越角。为提高船舶操纵性能的计算效率,文中利用作者早先新提出的一种单参数Lagrangian支持向量回归算法来训练并构建代理模型以预报船舶操纵性能,该算法整合了Laplace损失函数,仅采用单参数控制计算误差并于置信区间中增加了b~2/2项。以海洋平台支援船为例,采用SPL-SVR算法预报船舶操纵性能,并与基于NAPA计算仿真结果、人工神经网络、经典支持向量回归算法进行对比。不需要昂贵的仿真代码计算,文中采用SPL-SVR算法建立的船舶操纵性能响应面模型比较适合船型初步设计的工程实际应用,并具有较好的效率和适用性。     

提高舰船的装备能力（一）

美国海军实施“通过公用性提高装备能力（ＡＴＣ）“的技术方法，是部件模块化、设备标准化和工艺简单化的有机结合，其实施目标是使海军在工业界的帮助下，提高对国防船只进行改进设计、生产和维修的能力，本文是为了政府和工业蛤更易为对话和使用而ＡＴＣ计划进展的阶段性报告。     

多排槽式防波堤的水动力性能（英文）

This study examines the hydrodynamic performance of multiple-row vertical slotted breakwaters. We developed a mathematical model based on an eigenfunction expansion method and a least squares technique for Stokes second-order waves. The numerical results obtained for limiting cases of double-row and triple-row walls are in good agreement with results of previous studies and experimental results. Comparisons with experimental measurements of the reflection, transmission, and dissipation coefficients(CR, CT, and CE) for double-row walls show that the proposed mathematical model adequately reproduces most of the important features. We found that for double-row walls, the CR increases with increasing wave number, kd, and with a decreasing permeable wall part, dm. The CT follows the opposite trend. The CE slowly increases with an increasing kd for lower kd values, reaches a maximum, and then decreases again. In addition, an increasing porosity of dm would significantly decrease the CR, while increasing the CT. At lower values of kd, a decreasing porosity increases the CE, but for high values of kd, a decreasing porosity reduces the CE. The numerical results indicate that, for triple-row walls, the effect of the arrangement of the chamber widths on hydrodynamic characteristics is not significant, except when kd0.5.Double-row slotted breakwaters may exhibit a good wave-absorbing performance at kd0.5, where by the horizontal wave force may be smaller than that of a single wall. On the other hand, the difference between double-row and triple-row vertical slotted breakwaters is marginal.     

基于数据挖掘的舰船快速比照算法及舰船性能统计

在舰船开发过程中,耗费时间成本与经济成本最大的环节是舰船测试环节,每艘船在下水之前都要进行上百甚至上千次的水动力测试,海量的船舶测试数据对于新型船舶的设计与开发具有重要的指导作用。因此,从海量的船舶测试数据中提取有价值的信息,形成新的船舶性能数据,不仅可以缩短生产周期,而且能够指导船舶的设计过程,这是本文的研究重点。本文通过介绍数据挖掘技术和支持向量机技术,研究船舶性能快速比较算法以及性能统计。     

基于特征融合的舰船目标识别方法

传统的被动目标识别主要依靠声呐员的作用,随着人工智能的迅速发展,水下目标智能识别成为未来发展的趋势.针对这一问题,根据舰船辐射噪声特性,提出基于特征融合的舰船目标识别方法,通过提取基于人耳听觉感知的梅尔倒谱系数特征、基于循环平稳分析的谱相关密度函数特征,构建特征层融合和决策层融合的特征融合模型,利用深度学习中的卷积神经...