Results 31 to 40 of about 248,542 (278)
WINNER model for subway tunnel at 5.8 GHz [PDF]
2012 12th International Conference on ITS Telecommunications, 2012 Modern subways operation relies on wireless systems based on IEEE802.11x modems deployed inside tunnels. Constraints on robustness and needs for high data rates led to the use of MIMO techniques. In order to evaluate performance of MIMO systems in dynamic configurations with moving trains, it is mandatory to develop adequate dynamic channel model.
Hairoud, Siham +4 more
openaire +3 more sources
A case study of newly tunnels over-crossing the existing subway tunnels
International Journal of Distributed Sensor Networks, 2022 Due to the continuous expansion of congested urban areas, many new tunnels are inevitable to over-cross the existing subway lines and may even affect the operation of existing lines. It is vital to investigate the response of existing tunnel caused by over-crossing tunneling. In this study, a case history of closely spaced twin tunnels excavated above
Ben Wu 0003 +4 more
openaire +3 more sources
Electronic Journal of Structural Engineering, 2023 In order to analyze the interaction between the operating subway tunnel and the utility tunnel under construction during the utility tunnel under-passing the subway tunnel, an operating tunnel-stratum-utility shield tunnel coupled dynamic calculation ...
Jing Sun +3 more
doaj +1 more source
Underground Space, 2021 The excavation of a foundation pit considerably affects the adjacent structures and underground pipelines owing to the change in the stress state of the surrounding soil, resulting in deformation.
Shuaihua Ye, Zhuangfu Zhao, Denqun Wang
doaj +1 more source
Influence of tunnel environment on internal acoustic comfort of the subway car
机车电传动, 2022 Operating environment plays an important role to the noise inside the subway car. Tunnel environment leads to the increase of noise of the subway car and the rapid decrease of sound comfort, which seriously affects the passengers' physical and mental ...
XIE Jiankun, CHEN Xiaowei, WEI Haiju
doaj
Geofluids, 2022 The open-cut tunnels in Aixi Lake, Nanchang, are constructed in a condominium form of highway tunnel and subway tunnel, which are the first superimposed double-level tunnels in China.
Huang Zhanjun +5 more
doaj +1 more source
Influence of tunnel slope on movement characteristics of thermal smoke in a moving subway train fire
Case Studies in Thermal Engineering, 2021 In this study, the three-dimensional unsteady Navier-Stokes equation and fully buoyant corrected Renormalization-group (RNG) k-ε turbulence model were employed to investigate the influence of tunnel slopes on the temperature distribution characteristics ...
Dan Zhou +4 more
doaj +1 more source
International Journal of Transportation Science and Technology, 2022 With the rapid increase of urban rail transit networks, the environmental problems induced by vibrations from subway traffic become more and more prominent.
Chao He +3 more
doaj +1 more source
Numerical Study on the Deformation of Tunnels by Excavation of Foundation Pit Adjacent to the Subway
Applied Sciences, 2022 The excavation of the foundation pit will cause changes in the soil stress field around the foundation pit, and that may have adverse effects on the adjacent subway tunnels.
Xiang Zhao +6 more
doaj +1 more source
Study on the critical diameter of the subway tunnel based on the pressure variation
, 2014 When the subway train operates at a speed higher than 100 km/h, the corresponding aerodynamic issue becomes severe. To meet the future requirement for the speedup of subway trains, a research on the critical diameters of the subway tunnel for trains ...
Sun ZX(孙振旭) +3 more
core +1 more source