A Study in Port Planning: The Example of Mina Zayed

The correct number of berths that a port should provide is solved by a model which minimizes the total port usage cost in terms of the costs of berth provision and the costs accruing to ships from time spent in the port. This model is then applied to Mina Zayed in the Arabian Gulf as an aid to future planning, and from different sets of cargo forecasts an optimal stategy is derived using a game-theoretic approach.     

适应高爆发压力的高性能柴油机气缸盖设计

以某4DC发动机的基本参数为输入条件,对气缸盖进行了概念定义及详细设计,着重介绍了气道、油道、喷油器、配气机构和冷却水套的定义过程以及为保证气缸盖刚度和强度采取的技术措施,提出了气缸盖W型水套的概念。对该气缸盖设进行的设计评估结果表明,其使用性能、冷却性能、结构可靠性、铸造性能均满足设计要求,且气缸盖质量仅为30 kg,实现了气缸盖设计轻量化目标。     

Efficiency and ecological characteristics of a VCR diesel engine

Compression ratio (CR) is a design parameter with highest influence on efficiency, emission and engine characteristics. In conventional internal combustion (IC) engines, the compression ratio is fixed and their performance is, therefore, a compromise between conflicting requirements. One fundamental problem is that drive units in the vehicles must successfully operate at variable speed and loads and in different ambient conditions. If a diesel engine has a fixed CR, a minimal value must be chosen that can achieve a reliable self-ignition when starting the engine in cold start conditions. In diesel engines, variable compression ratio (VCR) provides control of peak cylinder pressure, improves cold start ability and low load operation, enabling the multi-fuel capability, increase of fuel economy and reduction of emissions. By application of VCR and other mechanisms, the optimal regime fields are extended to the prime requirements: consumption, power, emission, noise, etc., and/or the possibility of the engine to operate with different fuels is extended. An experimental Diesel engine has been developed at the Faculty of Engineering, University of Kragujevac. The changes of CR are realized by changing the piston chamber diameter. Detailed engine tests were performed at the Laboratory for IC engines. Special attention has been given to decrease of fuel consumption and exhaust emissions. An optimal field of CR variation has been determined depending on the given objectives: minimal fuel consumption, minimal nitric oxides, and particulate matter emissions, etc.     

Effect of rear slant angle on vehicle crosswind stability simulation on a simplified car model

It is important to know the effect of the aerodynamic forces and moments on driving stability because it is responsible for the excitation and influences the response of the vehicle. The purpose of this paper is to study the effect of rear slant angle of a surface vehicle on crosswind sensitivity for stability analysis. The vehicle mathematical model used to conduct a dynamic simulation was based on a simple reduced order lateral dynamics of sideslip and yaw rate motion coupled with aerodynamics model. The intention here is to compare the effect of rear slant angles response to crosswind and to rank the crosswind sensitivity ratings. The aerodynamic loads are defined as the function of the aerodynamic derivatives from the static wind tunnel tests. Result shows a 20° rear slant angle demonstrates the highest rating of crosswind sensitivity, while zero degree slant exhibits the least.     

Environmental changes in the western Black Sea related to anthropogenic and natural conditions

The Black Sea northwestern shelf (NWS) ecosystem has been subjected to the strongest anthropogenic pressure of the entire Black Sea as about 80% of the freshwater runoff is discharged there.This paper presents a review of the global environmental changes related mainly to increased eutrophication in the western Black Sea basin.A case study (CoMSBlack 92a cruise) attempts to highlight the interaction of some natural and anthropogenic factors responsible for specific chemical and biological features in the western Black Sea environment. The significance of processes located near the Danube river mouth, which, due to their relatively small space scale, have not been recognized before, is clarified. Hydrological processess of specific importance to the distribution and transformation of antropogenic inputs are river plume dynamics, coastal upwelling and mixing and downwelling over the shelf break and slope in this part of the basin. A layer of low hydrological variability (“conservative layer”) appears to be a natural feature of the area, hypothesized to precondition specific biological and chemical processes there.The results suggest that the interplay between the Danube anthropogenic nutrient load with the natural hydrological fronts and gradients provides opportunities for enhanced biological activity thus contributing to the global environmental changes in the Black Sea NWS.     

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。     

渐开线圆柱齿轮减速器三维参数化设计系统的研究

主要通过 PRO/E 建模和基于 Visual C 和 PRO/TOOLKIT 的编程,介绍少齿数渐开线圆柱直齿 轮减速器的三维参数化设计的一种途径,其中详细介绍 PRO/E 基于特征、面向加工、自下而上尺寸关系等建模理 念和建模技巧,以及数据库管理技术在系统实现中的应用。实践证明,在减速器产品设计过程中,利用三维参数化 设计技术可显著提高设计开发效率。     

基于海上舰艇编队的信息战效能评估方法研究

通过信息论的度量方法,结合海上舰艇编队的实际装备,建立了信息战效能评估的量化模型,分析了敌我双方信息对抗对信息战效能的影响.该模型可用于海军信息战仿真和评估.     

构筑人才"蓄水池"

人力资源是第一资源。本文围绕中船集团公司“五三一”战略目标和建设“国内领先、国际一流”科研设计院的发展目标，从实施人才强院战略、不断提升核心竞争力的高度，论述了加强人力资源管理的重要性和紧迫性。通过工作实践，对如何建立并完善求才、育才、用才、奖才各项人才机制以及谋划未来人才规划，建设人才新高地进行了探讨。