船舶饮用水消毒处理探讨

本文简要介绍目前船舶饮用水存在的问题,并探讨在船舶上可行的对饮用水进行消毒处理方法。     

浅谈船舶舱盖修理及水密性试验监测方法

文章首先介绍了船舶舱盖的重要性及经常出现的问题，然后介绍了目前船舶舱盖主要存在的变形问题及修理方法，最后介绍了几种行之有效的船舶舱盖进行舱口水密性试验的方法。     

如何提高内河船舶安全检查的质量

通过介绍船舶安全检查的定义,分析目前在内河船舶安全检查中存在的问题,从培训、管理、监督方面提出提高对内河船舶安全检查质量的方法。     

现代船舶管理存在的问题和改进措施

现代船舶管理水平决定了航运公司在市场中的地位及将来的发展。通过对现代船舶管理发展趋势和目前存在的问题着手分析,探讨提高现代船舶管理水平的方法。     

船舶机舱油污水非法排放的查处

为保护海洋环境,加大对船舶非法排污的查处力度,列举船舶非法排污途径,总结目前对船舶非法排污行为的常用检查取证方法,分析船舶非法排污的主客观原因,提出解决船舶非法排污问题、杜绝违法行为的建议。     

船舶火灾应急程序之探讨

探讨船舶目前普遍采用的火灾应急程序,分析存在的问题,提出解决的方法,为进一步完善船舶消防安全工作提供参考。     

超大型船舶在泊安全细节问题分析及建议

针对目前散货船大型化发展的趋势,采用实证分析的方法,以超大型船舶的系泊细节问题为切入点,就防止船舶在泊断缆及适卸的问题进行探讨,尝试提出解决方案,为大型船舶系泊安全设计优化提供参考。     

船舶碰撞研究的现状和趋势

本文阐述了世界船舶碰撞问题研究历史和现状,分析和总结了船舶碰撞的研究方法,介绍了船舶耐撞性和剩余强度的研究情况,并指出了目前船舶碰撞研究的热点和发展趋势。     

两岸海上直航台湾海峡的船舶交通及其规划研究

针对目前海峡两岸直航台湾海峡船舶交通运行存在的诸多问题,提出尽快研究和规划海峡船舶交通的科学管理方法和建议。     

对船舶推广和使用线接触结构钢丝绳的思考

船舶用钢丝绳是一种非常重要的器材,在我国船舶运输行业,钢丝绳的用途是十分广泛的。目前,船舶上线接触结构钢丝绳的使用率很低,严重影响该类器材性能和经济效益的发挥。文章分析了船舶行业钢丝绳管理、使用中存在的问题．提出了解决有关问题的基本方法和对策。     

Research developments in numerical methods of fluid-structure interactions in naval architecture and ocean engineering北大核心CSCD

流固耦合问题较为复杂,通常难以通过理论推导求得,而数值模拟则能提供一种有效的解决方案,并被广泛用于船舶与海洋工程领域。流固耦合数值方法根据其网格离散方式,可以分为贴体网格方法、非贴体网格方法、重叠网格方法和粒子类方法 4类,对这4类方法的特点及研究进展进行概述并总结得出:贴体网格方法和重叠网格方法均能精确捕捉界面的变形和演化,适合高雷诺数流动问题,在考虑结构变形时一般采用贴体网格方法,而考虑复杂几何形状的刚体运动时则常采用重叠网格方法;非贴体网格方法能够避免网格的更新操作,使计算较为简单,目前多用于模拟流动控制、水下柔性仿生航行器的研发以及多体运动干扰等问题;粒子类方法因其固有的拉格朗日属性,在模拟涉及自由液面剧烈变形、砰击、爆炸等强非线性流固耦合问题中发挥着重要作用。不同的流固耦合问题属性决定了不同方法的适用性,如何选取适合的数值方法,同时结合各类方法的优势开发新的计算方法以应对更为复杂的问题,是流固耦合算法开发的重要发展方向。     

入水问题的求解及其相关的工程应用(英文)

For solving water entry problems, a numerical method is presented, which is a CFD method based on free surface capturing method and Cartesian cut cell mesh. In this approach, incompressible Euler equations for a variable density fluid are numerically calculated by the finite volume method. Then artificial compressibility method, dual time-stepping technique and Roe’s approximate Riemann solver are adopted in the numerical scheme. Finally, some application cases are designed to show the ability of the current method to cope with water entry problems in ocean engineering.     

一类条件加强的非平衡指派问题的求解方法

本文针对一类条件加强的非平衡指派问题,提出了一种新的求解方法,即"加边排序补小值"法.利用该算法和匈牙利算法给出人员有能力限制且"人员数少于任务数"的多目标指派问题的求解,并给出了应用"加边排序补小值"法求解具体的数值例子。     

求解外域辐射和散射声场的分形有限元方法

应用二级分形有限元方法计算了外域声场.用一人工边界把外域声场分为两部分,人工边界以内使用常规有限元方法,人工边界以外的无限大区域使用分形有限元方法.使用分形有限元方法,一方面形成几何自相似网格使得相邻层之间的单元刚度矩阵和质量矩阵具有非常简单的关系,另一方面引用自动满足无限远辐射条件的全域插值函数把节点自由度变换为一组广义坐标,因而计算量可以大大减少.数值计算结果表明:该方法对于计算无限大外域声场是有效的.     

Numerical weight function method for the structural analysis of ships: a speedy direct calculation with condensed structural information

The weight function method was originally derived for crack problems to calculate stress intensity factors for arbitrary loading conditions. In this article, a numerical weight function method has been extended to formulate the structural response analyses of two-dimensional elasticity, plate-bending, and three-dimensional plate-structures by using the finite-element method. The solution procedure is based on the well-known Maxwell–Betti reciprocal theorem, which is applied to the original and properly defined auxiliary problems. The present numerical weight function may be considered as a finite-element version of a Green’s function in an integral equation solution scheme. Although ship structures are certainly analysed by the finite-element method in a practical design procedure, the weight function approach has not yet been realized. The method is very useful for the analysis of structures subjected to a vast range of loading conditions, because structural responses can simply be calculated by the inner product of the universal weight function and load vectors. The validity and convergence characteristics of the present method are investigated by two-dimensional elastic and plate-bending problems, respectively. Finally, the method is applied to the calculation of the response amplitude operator of a stress component at a critical structural detail of a double-hull tanker, and the speed and efficiency of the method are quantitatively discussed based on the practical results.     

应对PSPC标准分段预密性试验的方法与应用

PSPC标准的强制实施,对世界造船企业带来巨大的影响,我国船厂也面临着新的挑战。通过介绍分段预密性的几种试验方法,分析了预密性试验在特殊分段上的应用,提出了应对PSPC标准预密性试验常见问题及解决办法,总结了合理利用各种试验方法应注意的几个问题。     

Fully coupled BEM-FEM analysis for ship hydroelasticity in waves

This paper considers the problem of ship hydroelasticity, which is an important technical issue in the design of ultra-large vessels. For the analysis of fluid-structure interaction problems, a partitioned method is applied. The fluid domain surrounding a flexible body is solved using a B-spline Rankine panel method, and the structural domain is handled with a three-dimensional finite element method. The two distinct methods are fully coupled in the time domain by using an implicit iterative scheme. The numerical results of natural frequency and the motion responses of simple and segmented barges are computed to validate the present method through comparisons with experimental and numerical results. This study extends to the application to two real ships, 6500 TEU and 10,000 TEU containerships, for more validation and also observation on the practicality of the present method. Based on this study, it is found that the present method provides reliable solutions to linear ship hydroelasticity problems.     

局部正态物理模型在潮汐河口的应用研究*

首次在潮汐河口采用局部正态物理模型研究了局部冲刷问题,结果表明：采用局部正态物理模型研究潮汐河口 相关工程问题是可行的,试验水力条件的选择、模型边界的确定以及模型的整体变坡是将局部正态模型应用于潮汐河口的 关键技术,提出了简便易行且效果良好的模型边界的确定方法,阐述了模型整体变坡的必要性及方法。     

A free surface frequency domain green function with viscous dissipation and partial reflections from side walls

The free-surface Green function method is widely used in solving the radiation or diffraction problems caused by a ship or ocean structure oscillating on the waves. In the context of inviscid potential flow, hydrodynamic problems such as multi-body interaction and tank side wall effect cannot be properly dealt with based on the traditional free-surface frequency domain Green function method, in which the water viscosity is omitted and the energy dissipation effect is absent. In this paper, an open-sea Green function with viscous dissipation was presented within the theory of visco-potential flow. Then the tank Green function with a partial reflection from the side walls in wave tanks was formulated as a formal sum of open-sea Green functions representing the infinite images between two parallel side walls of the source in the tank. The new far-field characteristics of the tank Green function is vitally important for improving the validity of side-wall effects evaluation, which can be used in supervising the tank model tests.     

某工程围堤爆破挤淤合龙口的处理方法

采用爆破挤淤法进行基础处理时,合龙口一直是质量控制的重点和难点。本文介绍了某工程南堤合龙口处理中出现的问题、原因分析、处理方案及效果,从而丰富了爆破挤淤施工的理论和经验。