直左复线有轨电车干线可变带宽绿波模型

为降低有轨电车在交叉口的停车次数和交通延误,同时兼顾社会车辆通行效率,提出可容纳直行线路、左转线路有轨电车和社会车辆3类绿波系统的干线信号协调控制方法.设计直左轨道分叉交叉口的4种信号相位组合方案,构建社会车辆绿波系统、有轨电车直行线路和左转线路绿波系统的约束条件,以及3个绿波系统的交互性约束条件.基于可变绿波带宽优化...     

利用正线夜间停放客车提高运营效率的可行性

如果一条线路只有一座车辆段,并设在靠近线路的端部时,必须使线路两端终点站的运营服务时间基本接近。非运营时间客车全部停放在车辆段的传统做法,使运营时间利用率低、运营与夜间维修和施工时间的矛盾日渐突出。通过对利用正线非运营时间停放过夜客车来提高运营效率的可行性研究,结合广州地铁1、2号线的现状分析,提出解决方案,可减少列车空走和司机劳动强度,提高服务水平,有效地提高正线运营效率。     

北京城轨交通郊区线与市区线衔接方式的探讨

结合北京市近期轨道交通建设规划,对目前郊区线与市区线的衔接方式进行讨论,指出规划设计中存在的问题和原因。从市域居民出行分布特征、郊区线功能定位以及对市区线路运营影响、北京轨道交通快线网络和郊区线网络建设等方面,提出解决问题的措施和建议。     

俄罗斯重载线路车轮和钢轨外形的优化

介绍了俄罗斯重载线路轮轨外形匹配最优化的设计方法。     

Sea trials of Sigma wave energy converter – slacking and snapping of TLP mooring lines

Sigma Energy has performed its foremost prototype tests of scaled wave energy converter in a real sea environment. The prototype was a point absorber with a cylindrical buoy, a mechanical power take-off system with a counterweight, moored to the seabed as a tension leg platform (TLP) with three equal tendons. In these extensive experiments, numerous device characteristics were measured and analysed. The present paper focuses on the dynamic forces in the mooring lines, and some unexpected and rare data obtained. It is well known that TLP tendons are prone to a brief loss of tension (the slacking) and that, after such events, high snapping forces of short duration can arise. Partly by intention, and partly due to underestimation of the dynamical forces, several such slacking-snapping incidents were recorded during the experiments. In some severe storms, the snapping forces were up to six times higher than the tendon pretension. The paper presents several recordings of dynamic forces and platform motion during these critical events. It analysis them, and gives a typical scenario under which they occur. It gives also some theoretical explanations, and numerical predictions of dynamical tendon forces, with their comparison to the experimental results.     

城市轨道交通超长线路统计分析及思考

轨道交通在发展过程中出现大量的超长线路,各省市在规划建设中也存在着诸多问题.通过对现有文献进行梳理,总结影响线路长度的主要因素,包括城市规划与城市形态、客流效益、经济效益和社会效益、时间和速度目标值、系统制式与运营组织及线路直达性等,确定超长线路的长度范围;在此基础上,统计国内城市轨道交通超长线路,对其特点进行分析;针...     

基于全参数化建模的高速客船型线优化设计

以某型高速客船为研究对象.采用CAESES FRIENDSHIP-Framework软件进行全参数化建模,对初始模型采用SHIPFLOW软件进行兴波阻力计算,将计算结果与船模试验结果进行对比,以验证计算的可靠性.采用Sobol算法进行特征参数的灵敏度计算,以有效降低设计空间维数,提高计算效率.建立多航速优化模型,完成船...