关于渡线道岔控制方式的探讨

一直以来渡线道岔均被作为双动道岔进行控制,从电锁器联锁、电气集中,直到计算机联锁,渡线道岔双动被认为是天经地义的.渡线道岔为何必须双动,其根源就是从安全角度考虑.     

船用燃油加装纠纷与质量争议剖析及对策

通过对因燃油引起的纠纷和争议的分析,有利于处于船舶一线的船长和轮机长工作中把好燃油关,发生燃油问题时收集和保存证据,更好地履行自己的职责,合理地维护船东利益,减少纠纷与争议的发生。     

高铁引线的客运需求分析

在出行成本和出行时间上对民航和高铁进行对比分析,引申出高铁引线的基本概念.从社会经济发展水平、居民收入水平、人口数量、产业结构调整及城市化进程几个方面,对高铁引线客运需求的影响因素进行分析,提出了基于贝叶斯网络原理的旅客期望出行方式的网络模型.讨论了机场旅客在选择换乘方式和期望换乘方式中,起直接作用的影响因素以及这些因素之间的相互关系.由于具有节约时间、价格低廉、乘坐方便的优点,高铁引线是大部分旅客期望换乘使用的交通方式,从而为高铁引线的建设提供了理论支持.     

十个“五年计划“要略

今年是我国第十一个"五年计划"(2006年～2010年)的开局之年.自1953年开始的以5年为时间段来统筹和规划我国发展的"五年计划",已经完成了十个.现将已完成的十个"五年计划"要略记述如下.     

常浒河矮塔斜拉桥索力优化

针对矮塔混凝土斜拉桥结构受力特点,依据影响矩阵调值原理,应用MIDAS/CIVIL2010"未知荷载系数"模块,对常熟常浒河混凝土矮塔斜拉桥工程进行了成桥索力优化。分析结果表明,该方法可以方便地得到满足设计要求的合理成桥索力,且便于施工过程索力优化与结构内力的控制。     

MS Project软件在舰船设计中的应用初探

结合舰船装备设计的流程和特点，分析当前舰船装备设计管理上存在的问题，应用MS Project软件建立舰船装备船机电方案设计项目管理的初步模型，给出设计过程的甘特图．并运用该模型就任务脱期、资源调配等因素对项目整体计划的影响进行分析和快速重构．证明在舰船装备设计中灵活运用MS Project等软件能改善传统经验管理模式的不足，提高管理效率，有利于舰船装备设计项目的精细化管理。     

正式信号与过渡信号道岔复用转换方法

上海地铁3号线线路交付使用时间较早，为了能早日投入使用，临时采用过渡信号。 过渡信号采用64F半自动闭塞，站内采用小站联锁控制；道岔采用6线制电路控制。正式信号采用ALSTOM车载及地面设备。站内采用计算机联锁，道岔执行组电路采用6线制控制。     

常规道路公交与网络化运营的城市轨道交通协作模式

在城市轨道交通网络化运营不断发展的进程中,常规道路公交需要有新的协作模式.研究了常规道路公交在城市轨道交通运营的正常状态和突发状态下的协作模式.在正常状态的运营条件下,常规道路公交可以起到延伸轨道交通运营时间和提高网络连通性的作用,在突发状态的运营条件下,常规道路公交可以为城市轨道交通线路提供区段或全线的替代功能.     

Effects of Injection Timing on Transient Performance of A Regulated Two-Stage Turbocharged Diesel Engine with Turbine Bypass Valve

The object of this paper is to reduce soot emissions under typical 5s transient conditions of constant speed and increasing torque. And effects of fuel injection timing on combustion and emissions parameters were experimentally and numerically studied in a regulated two-stage turbocharged diesel engine with a turbine bypass valve (TBV). The test results indicated that: the smaller TBV opening could improve deterioration of smoke emissions and BSFC at medium and heavy loads. Afterward, the full-stage injection timing (FSIT) strategies (delaying injection timing during the entire transient process) could reduce soot and NO_X emissions simultaneously. However, when TBV opening became larger, smoke emissions and BSFC were deteriorated gradually. Moreover, the sectional-stage injection timing (SSIT) strategies (advancing injection timing from 10 % load to a preset load and delaying injection timing from the preset load to 100 % load) could markedly reduce soot emissions by 75.8 % with TBV opening 20 %; the degradation of fuel consumption could be effectively suppressed. Finally, coupling the SSIT strategies with the TBV control strategies could significantly improve the transient performance.     

Vehicle stability control based on driver’s emergency alignment intention recognition

In this work, the reference model modification strategy for vehicle stability control based on driver's intention recognition under emergent obstacle avoidance situation was proposed. First the conflicts between the driver's emergency alignment (EA) intention and vehicle response characteristics were analyzed in critical emergent obstacle avoidance situation. Second combining steering wheel angle and its speed, the driver's EA intention was recognized. The reference model modification strategy based on steering operation index (SOI) was presented. Then a LQR model following controller with tire cornering stiffness adaption was used to generate direct yaw moment for tracking modified reference yaw rate and reference sideslip angle. Finally based on the four-in-wheel-motor-drive (FIWMD) electric vehicles (EV), double lane change and slalom tests were conducted to compare the results using modified reference model with the results using normal reference model. The experimental tests have proved the effectiveness of the reference model modification strategy based on driver's intention recognition.