分析信号系统与列车折返过程的关系,指出信号系统架构和进路办理时间是影响列车折返时间的关键因素。提出新一代基于通信的列车控制(Communication Based Train Control,CBTC)系统架构及高效能列车折返技术,通过研究新一代CBTC系统架构...分析信号系统与列车折返过程的关系,指出信号系统架构和进路办理时间是影响列车折返时间的关键因素。提出新一代基于通信的列车控制(Communication Based Train Control,CBTC)系统架构及高效能列车折返技术,通过研究新一代CBTC系统架构的关键特点与列车折返实现过程,对其折返能力进行分析。分析结果表明,新一代CBTC系统通过系统架构优化和高效能列车折返技术,可将列车折返间隔缩短至90 s以内。此外,该系统采用的高效能列车折返技术也可应用于已开通的CBTC线路,通过局部技术升级,可实现线路折返效率的提升,符合未来轨道交通控制系统的发展方向。展开更多
The grain reifnement limits of commercial pure Al inoculated by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys were studied, and the inlfuence of melting temperature on the grain reifning performance of th...The grain reifnement limits of commercial pure Al inoculated by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys were studied, and the inlfuence of melting temperature on the grain reifning performance of these three master al oys was investigated using a high scope video microscope （HSVM）, a ifeld-emission scanning electron microscope （FESEM）, an electron probe micro-analyzer （EPMA） and X-ray diffraction （XRD） method. Results show that there is a grain reifnement limit of commercial pure Al reifned by these three master al oys; with the same addition level of 1.5% under the present experimental conditions, the grain reifnement limits （smal est average grain size） of commercial pure Al reifned by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys are 50 μm, 80 μm and 80 μm, respectively. In addition, with an increase in the melting temperature of the pure Al, the grain reifning performance of Al-5Ti-1B and Al-5Ti-0.25C master al oys decreases, but the grain reifning performance of Al-5Ti-0.3C-0.2B changes little.展开更多
文摘分析信号系统与列车折返过程的关系,指出信号系统架构和进路办理时间是影响列车折返时间的关键因素。提出新一代基于通信的列车控制(Communication Based Train Control,CBTC)系统架构及高效能列车折返技术,通过研究新一代CBTC系统架构的关键特点与列车折返实现过程,对其折返能力进行分析。分析结果表明,新一代CBTC系统通过系统架构优化和高效能列车折返技术,可将列车折返间隔缩短至90 s以内。此外,该系统采用的高效能列车折返技术也可应用于已开通的CBTC线路,通过局部技术升级,可实现线路折返效率的提升,符合未来轨道交通控制系统的发展方向。
基金financially supported by the National Natural Science Foundation of China(No.51071097)
文摘The grain reifnement limits of commercial pure Al inoculated by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys were studied, and the inlfuence of melting temperature on the grain reifning performance of these three master al oys was investigated using a high scope video microscope （HSVM）, a ifeld-emission scanning electron microscope （FESEM）, an electron probe micro-analyzer （EPMA） and X-ray diffraction （XRD） method. Results show that there is a grain reifnement limit of commercial pure Al reifned by these three master al oys; with the same addition level of 1.5% under the present experimental conditions, the grain reifnement limits （smal est average grain size） of commercial pure Al reifned by Al-5Ti-1B, Al-5Ti-0.25C and Al-5Ti-0.3C-0.2B master al oys are 50 μm, 80 μm and 80 μm, respectively. In addition, with an increase in the melting temperature of the pure Al, the grain reifning performance of Al-5Ti-1B and Al-5Ti-0.25C master al oys decreases, but the grain reifning performance of Al-5Ti-0.3C-0.2B changes little.
