抛锚碰擦球鼻的预报和防止

本文介绍在总体设计时防止抛锚碰擦船首球鼻的计算方法，以预测和防止事故发生。     

多层隔振系统多向冲击响应计算

本文研究了由多刚体组成的多层隔振系统，获得了多刚体振动系统在总体坐标系描述下的力学模型，找到了微分方程运动变量与系统广义坐标向量之间的一个重要变换公式（LG变换），指出了在总体坐标系下多刚体振动系统振型的物理意义，导出了该系统振动分析的有关计算公式，并且首次在基础多向冲击激励输入情况下，求得了系统的冲击响应，最后给出一计算实例。     

Artificial forces for virtual autonomous ships with encountering situations in restricted waters

ABSTRACT

Even if the same two ships operate in the same encountering situation, the actual strategies and timing of operations may be different. Therefore, the fixed collision avoidance trajectory and ship movements are no longer suitable for simulating the real ship behaviour. This paper tries to develop an artificial intelligent system that fully sensitive to the local circumstances and command a ship in virtual environment. Based on AIS (Automatic Identification System) data, this study has developed artificial forces which help decision makings on-board independently under different situations and catching the stochastic nature of ship behaviours during collision avoidances manoeuvring. Actual ship tracks are helpful for ascertaining the parameters that contribute to artificial forces in collision avoidances, while the correlation coefficient analysis is helpful to distinguish the parameters. This study will help to develop a navigation traffic simulation to reflect the realistic ship behaviour and provide reliable information for port and waterway planning, risk analysis, and mitigation measures. The method can be used in developing algorithms for autonomous ships. The method introduced in this study lays a foundation for developing artificial forces at intersections or bends, although the model is only applicable in straight channels at the moment.     

船舶碰撞责任的计算机辅助判析技术研究

探索船舶碰撞事故责任的计算机辅助判析技术,以弥补划分碰撞责任比例的支撑数据不充分。建立了适于裁决雾中船舶碰撞责任比例的知识体系,包括基于船舶行为以排除人为因素干扰,兼用于高速船的避让区界的新规则。提出了地自动处理任何船舶碰撞责任比例的模型。解决了船舶单项行为有无过失的定性问题及失量的计算机智能化确定问题。系统经实例试用,在合理性,快速性,经济性方面已初显优势。     

Investigations of vehicle securing without lashings for Ro-Ro ships

To reduce the area on deck occupied by each car and the labour and time required for lashing and unlashing cars, it has been proposed by the author that in some conditions, cars on decks could be transported without lashing. To evaluate cargo securing based on this “lashing-free” concept, computational code was developed to calculate the vehicle–deck interactions for various ship motions. The code was structured by incorporating a vehicle model into a piece of ship motion calculation code. A series of time-domain simulations were conducted to evaluate vehicle securing. It was found that for a target ship consisting of a 6000-unit Ro-Ro vessel, vehicle securing is mainly influenced by the ship's rolling motions and is highly dependent on the wave height and loading conditions. It was suggested from the analysis that vehicles could be secured without being lashed in a large area of the ship in specific weather conditions and on some routes with less adverse sea states. However, it is still suggested that conventional lashing holes should be constructed on the deck because in severe sea states the cars will still need to be lashed. The limitations of the current investigations are also presented. The relevant research work was carried out at the Division of Ship Design and Engineering, Department of Shipping and Marine Technology, Chalmers University of Technology.     

导航信号卡尔曼滤波定位解算方法研究

研究了导航信号的卡尔曼滤波定位解算方法，该方法能够实现用小全的测量值完成导航解的估值解算，同时还可以对导航解进行平滑，减小噪声对导航解的影响。仿真结果证明了该方法在导航定位解算中的有效性和可行性。     

最小二乘法修正船底基线

船底基线是船舶水尺和载重线堪划的基准,船底基线的挠度也是检验船体建造精度的重要指标之一.如果测量的挠度值超过了允许极限,除了需向船东解释超差的原因外,还要提出合理的修正措施.选用最小二乘法对超差的船底基线挠度进行修正是一种值得推荐的方法.