Development of a hull form definition tool with a related knowledge-based advisory system

The development of a parametric hull form design system utilizing combined knowledge-based and objectoriented methodologies, approaches, and techniques is the major purpose of this research. One objective was the development of a powerful, intuitive, and parameter-based hull definition system with a related hull definition advisory system that would provide useful and necessary advice to the user. Object and knowledge modeling activities were conducted during the analysis and design stage to facilitate the implementation of a hull design program and advisory system. The hull design system includes the generation of a geometric model from a process of aggregating simple user-selected shapes representing different boundaries. Design involves the capability to vary simple parameters such as entrance angles, length-breadth ratios, and radii to define local and general surface geometries. Hydrostatic calculations are included for analysis; results are referred to an advisory system for evaluation and the determination of the acceptability of parameters and analysis results. The advisory system includes a knowledge bases consisting of hull form databases, results of the statistical analysis of data, design parameter constraints, and expert knowledge acquired from designers, reference materials, and technical reports. Use of the design tool with the advisory system results in the rapid generation of hull forms and associated design evaluations. Flexibility in decision making results from the separation of the design system from the advisory system. The independence of the two systems allows for a wide range of user experience with experts using the design tool with minimal reference to the advisory system. On the other hand, the expertise and knowledge stored in the advisory system is fully available to inexperienced designers and users.     

结构可靠性优化设计的遗传算法

本文针对结构可靠性优化设计问题的特点与计算上的难点，提出遗传算法，文中比较详细地比较了遗传算法的理论基础，遗传算子及工作过程，并对参数选择及其对收敛的影响作了探讨，最后以两个可靠性优化问题作了算例，验证了遗传算法解决此类问题的有效性。     

用动态规划方法优化设计船舶车辆甲板结构

基于规范的车辆甲板结构优化设计在数学上是一个较大的非线性规划问题，而且为了满足实际需要，其中一些变量只能离散变化。本文将该问题处理为三阶段决策问题，因而能运用动态规划方法有效地求解。通过一个实例详细说明求解过程，从中看出应用动态规划方法解决基于规范的船舶结构优化设计问题的特色。     

采用模型设计和模型试验方法研制大型泵

本文对采用模型设计和模型试验方法研制大型离心泵的计算理论，结构设计和材料选用等问题进行了探讨，确认了只有在正确运用相似计算公式的前提下才能保证相似设计可靠性的观点，验证了叶轮进口截面几何形状对离心泵汽蚀性能和效率值的影响，并提出了国内现有的能较好满足船艇货油泵运转条件的材料组合建议方案。     

对集装箱堆场消防设计的建议

通过对集装箱堆场水消防系统设计的分析,结合工程实例,对集装箱堆场消防设计优化提出建议。     

巴哈马车客渡船设计简介

本船作为车客渡船具有多用途、多任务的特点,适应性强.该文从型线设计、总体布置、稳性计算等方面,概要介绍了本船的一些设计特点.     

基于ES/DB的舰船航行性能设计系统结构研究

概述了ES／DB技术在船舶航行性能设计中的应用状况，并通过对舰船航行性能设计复杂性的分析，结合专家系统和数据库技术的特点，提出了一个基于ES／DB技术的舰船航行性能设计系统，并对其总体功能结构和关键技术进行了研究和探讨。     

我国地铁接触轨技术发展综述与研发建议

介绍了接触轨系统的构成、技术特征和我国应用接触轨技术的概况。在直流1500V接触轨系统的“四大环节”研究中,建议重点对系统设计标准及产品制造标准进行研究;在系统设计标准的“四大关系”研究中,建议重点对1500V接触轨与人身安全防护的关系进行研究。在钢铝复合接触轨的国产化工作中,应重点解决好不锈钢带与铝型材的结合问题,以及不锈钢带的材质和外型表面平顺问题。     

六连杆橡胶关节的运动关系分析与设计参数确定

介绍了六连杆轮对空心轴传动装置的组成和运动特点,通过计算分析了六连杆橡胶关节的运动关系,并结合实例,给出了橡胶关节的设计参数。     

异步牵引电动机参数化设计的研究

阐述了运用先进的参数化设计方法和程序设计语言VBA(Visual Basic Application)、基于AutoCAD2000的软件平台开发的异步牵引电动机参数化设计系统,并以JD106电动机为模型进行了具体描述。该系统可以大大缩短设计周期,提高效率。