槽形梁三维实体有限元分析

结合上海市轨道交通6号线槽形梁施工图设计,运用通用有限元软件ANSYS对槽形梁进行三维实体分析,着重介绍在各种荷载工况下结构纵向、横向、竖向的应力和变形,将相同位置的分析结果与平面分析进行对比,以验证分析结果的正确性,以及分析结果在设计中的成功应用。     

列车防护报警和客车列尾系统

介绍了列车防护报警和客车列尾系统的构成和主要功能,分析并指出该系统的无线数据传输应采用调频方式和800MHz频段工作频率.     

现代潜艇铅酸蓄电池放电模型研究

铅酸蓄电池是常规潜艇水下航行的核心动力，为优化动力系统工作性能，需要建立放电模型．在分析蓄电池放电特点的基础上，提出了建模需要解决的若干问题和神经网络的方法．基于前馈神经网络，模拟了任意放电率下的恒流放电规律．利用插值法、积分和坐标变换等方法，得到了蓄电池恒功率放电模型，解决了端电压、放电电流变化规律、放电起始点和放电率计算等同题．潜艇续航力核算表明所建立的放电模型可行。     

A structured flexible transit system for low demand areas

Public transit structure is traditionally designed to contain fixed bus routes and predetermined bus stations. This paper presents an alternative flexible-route transit system, in which each bus is allowed to travel across a predetermined area to serve passengers, while these bus service areas collectively form a hybrid “grand” structure that resembles hub-and-spoke and grid networks. We analyze the agency and user cost components of this proposed system in idealized square cities and seek the optimum network layout, service area of each bus, and bus headway, to minimize the total system cost. We compare the performance of the proposed transit system with those of comparable systems (e.g., fixed-route transit network and taxi service), and show how each system is advantageous under certain passenger demand levels. It is found out that under low-to-moderate demand levels, the proposed flexible-route system tends to have the lowest system cost.     

永连公路滑坡加固与治理

结合永连公路两处较为典型的滑坡实例,通过对滑坡产生原因的分析,介绍了不同滑坡的治理办法,同时认为因地制宜、精心设计和认真作好施工管理是滑坡治理工作的关键。     

水乡城镇常规公交运营现状调研方法及结果分析

为解析常规公交运营问题,奠定水乡城镇发展的公共交通基础,提出一套公交运营现状调查与分析方法。从供给角度设置站点配置、线路设计、线路客流量、满载率和运行车速等指标,通过随车调研采集数据;从需求角度设置居民出行特征、公交服务满意度和关注度等指标,通过问卷调查采集信息;基于技术角度,从公交网络、站点和线路构建评价指标,通过数据挖掘和分析获取评定结果。以东莞市道滘镇为例验证方法有效性,调查结果发现:道滘镇常规公交车运营现状存在客流量少、满载率低、运输服务通达性差等供需不平衡问题,需通过调整站点、拓展线路和优化衔接方案等改进公共交通运输系统。相较于传统调研模式,新调查方法更符合水乡城镇的路网结构和运输特征,能为常规公交运营现状提供多方位分析和评价。     

关于沿海小型船舶安全管理问题的思考

一、沿海小型船舶安全管理中存在的主要问题 1，船公司对船舶管理不严，安全责任制不落实 从2004年全国海事系统开展的沿海小型船舶专项整治活动来看，大多数的沿海小型船舶公司虽然都建立了相关的安全管理规章制度，但内容比较粗糙，公司的管理普遍存在不规范和安全意识不强的情况。有的公司制度形同虚设，安全措旋和规章制度得不到真正的落实和执行；有的公司没有配备专业管理人员。     

Energy efficiency optimization of electric vehicle driven by in-wheel motors

Electric vehicle is considered to be the solution for energy and environment crisis, but it’s still not competitive enough with conventional vehicles because of the limited energy density and high cost of the power battery. So the energy efficiency is of the most importance for the control of electric vehicles. This paper looks into the energy efficiency optimization problem of electric vehicle driven by four in-wheel motors by developing a comprehensive energy efficiency model of the permanent magnet synchronous motor including the inverter. The calculated efficiency agrees with the measured data quite well. Based on the power loss analysis, the conclusion is drawn that in all driving or braking conditions the total torque requirement should be distributed evenly to all the motors in order to maximize the energy efficiency for electric vehicles driven by permanent magnet synchronous in-wheel motors. Vehicle test results show that the energy efficiency of the evenly distributed torque control is higher than the control strategy proposed by control allocation in literature.     

地铁地下线凹形竖曲线最低点位置及高程的确定

地铁地下线为设置排水泵站须寻求线路纵坡最低点位置及高程,论述地下线纵坡凹形变坡点处竖曲线地段最低点准确位置及高程计算方法,并列出计算成果表。     

我国港口物流发展对策探讨

介绍了港口物流的概念,分析了国内有关港口物流的现状,阐述了国际上先进港口物流成功的经验,进行了深入的对比分析,提出建议.