DATABASE SYSTEM APPROACH FOR PREDICTING SHIP MANEUVERING PERFORMANCE

预测船舶操纵性能的数据库系统方法

基本信息

批准号：
03452195
负责人：
KOSE Kuniji
金额：
$ 3.65万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

There have been so many fatal accidents which may cause serious marine pollutions and the maneuverability standards is now under discussion at the IMO. Then it becomes important to predict maneuvering performance of ships at the initial design stage. In the present research a database system is investigated for such predictions.The databases of ships' particulars, hydrodynamic forces and maneuvering performance were built up and the procedures to estimate the relations among three databases have been developed. The database of maneuvering performance contains the sea trial results of about 760 ships and this is the most detailed one ever built.To investigate the relation between ships' principal particulars and maneuvering performance, both database were analyzed statistically and the empirical formulae were successfully found for turning abilities. However, it is difficult to find the clear relation between the principal particulars and the directional stabilities.An effort was also paid for finding the relations between the principal particulars and the hydrodynamic forces. It seems possible to estimate the rough relations between both databases. To estimate the maneuvering performance with enough accuracy, however, hull forms, especially of sterns must be taken into consideration. The concept of type ship is shown effective and it is pointed out that the combination of the database approach and theoretical procedures of hydrodynamic force estimations should be investigated.To evaluate the allowable limit of directional instability of ships under human control, simulator studies were widely carried out and the standard of this ability was finally proposed, taking account of the above limit and the possible level estimated from the database analysis. The proposal becomes the standard plan proposed by Japanese government for the IMO.

已经发生了很多致命事故，可能会造成严重的海洋污染，国际海事组织正在讨论可操纵性标准。那么在初始设计阶段预测船舶的操纵性能就变得很重要。在本研究中，研究了用于此类预测的数据库系统。建立了船舶细节、水动力和操纵性能的数据库，并开发了估计三个数据库之间关系的程序。操纵性能数据库包含了约760艘船舶的海试结果，这是迄今为止建立的最详细的数据库。为了研究船舶的主要特征与操纵性能之间的关系，对两个数据库进行了统计分析，并成功找到了经验公式转动能力。然而，很难找到主要细节与方向稳定性之间的明确关系。我们还努力寻找主要细节与水动力之间的关系。似乎可以估计两个数据库之间的粗略关系。然而，为了足够准确地估计操纵性能，必须考虑船体形状，尤其是船尾的形状。型船概念被证明是有效的，并指出应研究数据库方法与水动力估计理论程序的结合。为了评估人为控制下船舶方向失稳的允许极限，广泛开展了模拟器研究。考虑到上述限制以及通过数据库分析估计的可能水平，最终提出了该能力的标准。该提案成为日本政府向IMO提出的标准计划。