船舶防火与安全管理机制的改革

通过对两起货轮火灾事件的评析,针对当今我国运输船舶防火工作的管理机制的现状,提出必须放弃传统的做法,吸收先进的管理经验,创建出一套新的船舶防火管理机制。     

我国国际航运业体制改革的初步思考

体制改革是我国国际航运业摆脱困境,进一步市场化和国际化的必由之路。航运企业的体制改革必须建立现代企业制度,真正实现产权明晰、责权分明、政企分开、管理科学的管理模式,必须进一步加强管理,改善服务,实现企业的体制创新和制度创新;加强企业经营机制的转变,加速市场化和国际化进程,以适应国际航运市场的运作惯例和竞争环境。     

舰船主柴油机双机并车控制仿真技术的研究

从对舰船主柴油机调速的工作原理分析入手,介绍现在常用的3种舰船主柴油机双机并车运行控制技术的原理和特点,然后,利用现在比较流行的仿真应用软件Matlab,建立主柴油机、调速系统和推进装置的仿真模型,并对功率反馈调速器进行仿真试验研究,阐明计算机仿真技术在舰船主柴油机双机并车控制技术研究中的作用。     

图像处理技术在船舶推进器空泡试验中的应用研究

运用数字图像技术和AutoCAD2000图形软件,探索了处理螺旋桨桨叶上空泡图像的问题,利用桨叶空间曲面网格和桨叶空泡图像对比的方式给出了浆叶上空泡区域的边缘,同时还指出了使这一技术实用化需要作的工作。对于空泡体积这一问题,提出了结构光方式的测量模型,它比已报道的同类方法有较高的操作效率。     

浅谈日本“来岛海峡”的航行方法

对往返于中国和日本的“联裕”轮多次安全通过日本“来岛海峡”进行了相关分析,浅谈如何根据水文气象资料和有关法规法则安全通过日本“来岛海峡”的航行方法及所采取的航行措施。     

航标技术改造中的风险预测及管理

风险预测及管理是国示航8标界近年来颇为关注的话题。如何在航标管理中引入风险的概念,如何通过风险管理来达到航标建设投入与产出的合理平衡是我们中国航标界人员应仔细思考的问题。本文结合以往在航标技术改造中的一些经验,论述了航标技术改造的风险类型,以及相应的评估指标体系,初步总结了这方面的经验,供参考。     

港口散粮工程电气系统的特点及应注意的问题

结合大连港大窑湾码头已建成的2个散粮专用泊位在电气系统设计和施工中出现的问题,对港口散粮工程电气系统的特点及应注意的问题作一阐述。     

波、流共存时的床面剪切力

利用边界层理论 ,导出了波、流共存时的床面剪切力 ,得出综合摩阻系数、综合速度和综合摩阻速度计算公式     

A new approach for improving the performance of freight train timetabling of a single-track railway system

A new approach for improving the performance of freight train timetabling for single-track railways is proposed. Using the idea of a fixed-block signaling system, we develop a matrix representation to express the occupation of inter- and intra-station tracks by trains illustrating the train blocking time diagram in its entirety. Train departure times, dwell times, and unnecessary stopping are adjusted to reduce average train travel time and single train travel time. Conflicts between successive stations and within stations are identified and solved. A fuzzy logic system is further used to adjust the range of train departure times and checks are made to determine whether dwell times and time intervals can be adjusted for passenger and freight trains at congested stations to minimize train waiting times. By combining manual scheduling expertise with the fuzzy inference method, timetable efficiency is significantly improved and becomes more flexible.     

Innovative strategies for urban car-sharing systems and a simulator to assess their performance

In this paper, three innovative car-sharing systems for urban areas are proposed, based on fleets of individual intelligent vehicles with three service characteristics: instant access, open-ended reservations and one-way trips. These features provide high flexibility but create an uneven distribution of vehicles among stations. Therefore, relocation of vehicles must be performed. Three different system procedures are proposed: in the first system, relocations are performed by users; in the other two, vehicles relocate automatically, thanks to their automation. In the first two systems, vehicles are accessible only at stations, whereas in the third they are also accessible along roads. In order to provide transport managers with a tool to test systems in different realities, an object-oriented simulator is developed. The simulation provides outputs of system performance, in terms of user waiting times and system efficiency. The proposed systems are simulated for the city of Genoa, in Italy, and a comparative analysis is presented.