议嘉兴电厂码头船舶靠离泊操纵

本文结合自己的实际工作经验,根据嘉兴电厂码头实际状况,对4万载重吨级老旧船靠离泊嘉兴电厂码头的操纵方法和注意事项作简要总结.     

两船在航状态的靠泊操纵

大型油轮在航过驳作业方式的靠泊操纵是比较特殊的船舶操纵方式,根据操纵实践经验详细介绍了该靠泊方式对海域、海况和设备的要求以及各阶段操纵要点,以为借鉴.     

基于模拟器的“船舶操纵基础”实践创新教学研究

文章在分析新形势下航海类大学生实践创新能力培养必要性的基础上,以船舶操纵模拟器为平台、以水上实践和模拟器教学经验为铺垫,运用层次递进、项目导向和任务驱动法,紧密结合专业课程教学和行业实际需求,系统阐述了"船舶操纵基础"实践创新教学的思路、过程、手段和效果,以期为航海类院校开展专业实践创新教学提供借鉴。     

超大型船舶的制动性探讨

船舶的停车制动是船舶操纵与避碰的一种重要手段。船舶紧急制动成功与否,取决于主机的正确操纵。船舶制动性的好坏直接关系到船舶的安全。文中介绍了各种船舶制动方法,对超大型船舶的制动特性进行分析,并对拖船倒车制动法进行了探讨。     

Synthesis of experimental designs of maneuvering captive-model tests with a large number of factors

An approach to synthesizing D-optimized experimental designs for an arbitrary number of factors was developed and tested on a third-order polynomial regression model with 5–8 factors. Three options were envisaged for the internal optimization procedure: an exhaustive search, a quasirandom search with the help of the Sobol sequences, and a genetic algorithm. The calculations performed have shown the pronounced superiority of the variant involving a genetic algorithm. Captive-model tests with a catamaran model with varying Froude number, drift angle, rate of yaw, sinkage, trim, and heel are presented as an example of the practical synthesis of the experimental design. The linear regression model constructed is a third-order 5-factor polynomial with respect to all factors except the Froude number. The influence of the latter is accounted for by representing the polynomials regression coefficients as functions of the Froude number represented as a truncated Fourier series with a linear term added.     

Finite-volume simulation of flows about a ship in maneuvering motion

A finite-volume method of computing the viscous flow field about a ship in maneuvering motion was developed. The time-dependent Navier-Stokes equation discretized in the generalized boundary-fitted curvilinear coordinate system is solved numerically. A third-order upwind differencing scheme, a marker and cell (MAC)-type explicit time marching solution algorithm and a simplified subgrid scale (SGS) turbulence model are adopted. The simulation method is formulated, including the movement of a computational grid fitted to the body boundary that allows computation of the flow field around a body under unsteady motion. To estimate the maneuvering ability of a ship, the accurate prediction of the hydrodynamic forces and moments of the hull is important. Therefore, experimental methods of finding the hydrodynamic forces of a ship in maneuvering motion, such as the oblique towing test, the circular motion test (CMT) and planar motion mechanism (PMM) test, were established. Numerical simulation methods for those captive model experiments were developed introducing computational fluid dynamics (CFD). First, numerical methods for steady oblique tow and steady turn simulation were developed and then extended to unsteady forced motion. Simulations were conducted about several realistic hulls, and the results were verified by comparisons with measured results obtained in model experiments. Hydrodynamic forces and the moment, the longitudinal distribution of the hydrodynamic lateral force, and the pressure distribution on the hull surface showed good agreement.     

背离条款和背离操纵问题探讨

本文对《１９７２年国际海上避碰规则》（以下简称《规则》）中的背离条款作了一些有益的探讨。文章通过实例以及对有关术语涵义的辨析，对采取背离行动的必要条件和时机作了具体分析，并通过图解对互见中处于交叉相遇态势船舶的应急操纵行动进行了分析比较，提出了相应的合理的背离操纵方案。     

船舶操纵模拟器在港航设计论证上的应用研究

分析了船舶操纵模拟器在港航设计论证上的应用现状，应用前景及应用范围，并结合具体的实例，探讨了运用船舶操纵模拟器进行港航设计论证的方法。     

归湖韩江特大桥通航净宽尺度论证

为推进归湖韩江特大桥项目建设,根据工程实际情况,结合GB 50139—2004《内河通航标准》和交通部行业联合科技攻关项目(2003-335-343-42)成果,论证旁拖、斜交、横流、紊流等因素对特大桥通航净宽的影响,最终确定其通航净宽尺度。并为类似跨航道建筑物通航净宽设计提供实例参考和具体计算模型。     

基于AMESim的被动式作动筒张力器仿真研究

浪、涌等因素给海上航行横向补给带来极大地挑战,波浪补偿装置是解决这一问题的关键装备,因此,有必要对现有的波浪补偿装置进行分析研究。本文在分析被动式作动筒张力器工作原理的基础上,首先对其进行简化处理,并借助AMESim液压仿真软件,建立被动式作动筒的仿真模型。仿真结果表明,如果对被动式作动筒张力器进行合理的参数设置,其波浪补偿效果满足航行补给的要求。