潜体非定常兴波问题的数值求解

开发了一种求解非定常兴波问题的基于非均匀有理B样条(NURBS)的三维面元法，应用该方法对潜体加速航行的情况进行了数值计算研究．基于势流理论，建立了线性边值问题．在物面上分布时域Kelvin源，物面和物面上的源强分布都用NURBS来表示．用时间步进的方法求解这一边值问题．对潜体中低速航行的情况进行了计算，给出了即时的波阻和波型。     

长江通航安全研究的船舶操纵仿真系统

长江水域通航条件高度复杂，有针对性地开展船舶操纵模拟系统的研究显得尤为重要，文中介绍了全功能大型船舶操纵模拟器及通用船舶操纵计算机仿真平台（USManCSP），提出以前者砻实时模拟基础，结合USManCSP中的电子江图信息系统（ECS）、内河船舶操纵运动数学模型、基于模糊控制的引航员控制模型等进行快时模拟研究，建立较完善的通航安全论证分析平台，并给出了二个急弯河段的模拟研究结果．     

船舶近岸航行岸壁效应数值研究

岸壁效应对近岸航行船舶的安全性有重要影响,若操作不当常会造成船舶过度与岸壁接近而发生碰撞.文中以系列60(Cb=0.6)船型为例,采用一种一阶Rankine源面元法计算其在浅水域中以恒定速度沿3种不同岸壁航行时受到的横向力和首摇力矩,分析了水深、船到岸壁距离、岸壁倾斜角度以及下潜岸壁高度等对船舶受到的水动力的影响.     

Application of support vector machine to ship steering

System identification is an effective way for modeling ship manoeuvring motion and ship manoeuvrability prediction. Support vector machine is proposed to identify the manoeuvring indices in four different response models of ship steering motion, including the first order linear, the first order nonlinear, the second order linear and the second order nonlinear models. Predictions of manoeuvres including trained samples by using the identified parameters are compared with the results of free-running model tests. It is discussed that the different four categories are consistent with each other both analytically and numerically. The generalization of the identified model is verified by predicting different untrained manoeuvres. The simulations and comparisons demonstrate the validity of the proposed method.     

Computation of the viscous hydrodynamic forces on a KVLCC2 model moving obliquely in shallow water

The viscous hydrodynamic force and moment on ships moving obliquely in shallow water axe important for ship navigation safety. In the paper, the viscous flow field around a KVLCC2 model moving obliquely in shallow water is simulated and the hydrodynamic drag, lateral force and yaw moment acting on the hull are obtained by a general purpose computational fluid dynamics (CFD) package FLUENT with shear-stress transport (SST) k-w turbulence model. The numerical computation is performed at different drift angels and water depths. The numerical results are compared with experimental results, and a good agreement is demonstrated.     

Numerical study on bank effects for a ship sailing in shallow channel

A numerical study on bank effects in shallow channels is carried out by using a first-order Rankine source panel method. A container ship sailing along a vertical bank and a sloping bank at different forward speeds, different water depths and different distances between the bank and the ship hull is taken as example. The sway force and yaw moment acting on the hull are calculated and the influences of the speed, water depth and distance between the bank and ship hull on the hydrodynamic force and moment are analyzed. This study can provide insight into the bank effects, as well as to give guidance on ship manoeuvring and control in restricted waterways, which is helpful to the navigation safety.     

一种内河顶推船队的引航控制模型

引航控制模型是考虑了人在控制闭环中作用的船舶自动引航模型,它不同于精确控制航迹或者航向的自动舵控制模型,重点在于量化和探索船舶驾引知识和经验.它是港口航道设计和安全评估经常采用的快时模拟的基础.基于模糊推理方法,结合系列内河船队操纵性实测数据与实际操船经验,设计出一种仿真智能的内河顶推船队引航控制模型,并以某顶推船队为原型,进行了仿真试验.结果表明:引航控制建模方法,包括隶属度函数和推理规则的确定能忠实地反映人员操舵控制过程.这种建模方法可为快时模拟论证等工作提供理论和技术支持.