空中高速路作为一种新型的空域结构,在其设计及运行方面的研究存在许多空白,需要逐步建立、完善空中高速路的结构与运行规则。在初步规划中国空中高速路网基础上进行匝口设计。首先依据欧洲空中高速路运行以及中国航路网实际情况给出了...空中高速路作为一种新型的空域结构,在其设计及运行方面的研究存在许多空白,需要逐步建立、完善空中高速路的结构与运行规则。在初步规划中国空中高速路网基础上进行匝口设计。首先依据欧洲空中高速路运行以及中国航路网实际情况给出了相邻匝口间距离限制。考虑由周边机场出港且可能途经空中高速路的航班架次数及其地理位置、以及150 n mile距离限制选取所研究机场,利用加权的最短路径模型、航迹夹角限制得出匝口设计方法,从而为中国规划设计空中高速路以及优化整个空中高速路系统的运行提供理论参考。展开更多
Based on the vehicle track coupling dynamics theory, a new spatial dynamic numerical model of vehicle track subgrade coupling system was established considering the interaction among different structural layers in the...Based on the vehicle track coupling dynamics theory, a new spatial dynamic numerical model of vehicle track subgrade coupling system was established considering the interaction among different structural layers in the subgrade system. The dynamic responses of the coupled system were analyzed when the speed of train was 350 km/h and the transition was filled with graded broken stones mixed with 5% cement. The results indicate that the setting form of bridge-approach embankment section has little effect on the dynamic responses, thus designers can choose it on account of the practical circumstances. Because the location about 5 m from the bridge abutment has the greatest deformation, the stiffness within 0 5 m zone behind the abutment should be specially designed. The results of the study from vehicle track dynamics show that the maximum allowable track deflection angle should be 0.09% and the coefficient of subgrade reaction(K30) is greater than 190 MPa within the 0 5 m zone behind the abutment and greater than 150 MPa in other zones.展开更多
文摘空中高速路作为一种新型的空域结构,在其设计及运行方面的研究存在许多空白,需要逐步建立、完善空中高速路的结构与运行规则。在初步规划中国空中高速路网基础上进行匝口设计。首先依据欧洲空中高速路运行以及中国航路网实际情况给出了相邻匝口间距离限制。考虑由周边机场出港且可能途经空中高速路的航班架次数及其地理位置、以及150 n mile距离限制选取所研究机场,利用加权的最短路径模型、航迹夹角限制得出匝口设计方法,从而为中国规划设计空中高速路以及优化整个空中高速路系统的运行提供理论参考。
基金Project(41030742) supported by the National Natural Science Foundation of ChinaProject(2009G010-c) supported by the Technological Research and Development Programs of the Ministry of Railways,China
文摘Based on the vehicle track coupling dynamics theory, a new spatial dynamic numerical model of vehicle track subgrade coupling system was established considering the interaction among different structural layers in the subgrade system. The dynamic responses of the coupled system were analyzed when the speed of train was 350 km/h and the transition was filled with graded broken stones mixed with 5% cement. The results indicate that the setting form of bridge-approach embankment section has little effect on the dynamic responses, thus designers can choose it on account of the practical circumstances. Because the location about 5 m from the bridge abutment has the greatest deformation, the stiffness within 0 5 m zone behind the abutment should be specially designed. The results of the study from vehicle track dynamics show that the maximum allowable track deflection angle should be 0.09% and the coefficient of subgrade reaction(K30) is greater than 190 MPa within the 0 5 m zone behind the abutment and greater than 150 MPa in other zones.
