scholarly journals Effect of Aerodynamic Moment on High-Speed Maglev Train Under Complicated Conditions

2021 ◽  
Author(s):  
Zhanzhou Hao ◽  
Bo Yin ◽  
Guowei Yang ◽  
Pan Xiao
Keyword(s):  
High Speed ◽  
Pitching Moment ◽  
Maglev Train ◽  
High Speed Rail ◽  
Substantial Impact ◽  
Sliding Mesh ◽  
Aerodynamic Moment ◽  
Design Speed ◽  
The Moment ◽  
Complicated Conditions

Abstract As the next generation of high-speed rail transportation, the high-speed maglev train has a design speed of 600km/h, whose Mach number is about 0.49. The severe aerodynamic effect caused by this high speed has a substantial impact on the train’s stability and safety. In this paper, the aerodynamic moments of two three-carriage maglev trains passing by each other in open air are investigated by numerical simulation. To get transient moments acting on the train, this study adopted the sliding mesh method and the k-ε turbulent model, and a user-defined function was compiled to define the motion of maglev. The results show that the pitching moment is the most important factor for the steady of maglev trains running in the open air. The oscillation of the total aerodynamic moment mainly comes from the moment acting on the lower part. The coupling of the pitching moment acting on the upper and lower part of carriages make the peak of the total pitching moment behind the total yawing moment.

scholarly journals Prospects for the development of high-speed railway communication in Russia based on the analysis of foreign experience

2021 ◽  
pp. 136-145
Author(s):  
Inna N. Rykova ◽  
Andrey A. Alaev
Keyword(s):  
United States ◽  
High Speed ◽  
The United States ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Level Of Economic Development ◽  
Passenger Flows ◽  
The Moment ◽  
High Level ◽  
Transport Complex

The article is devoted to the experience of the implementation of high-speed railways in foreign countries and the possibility of its use in Russia. Particular attention is paid to the issues of financial and economic justification of such projects, using the criteria of commercial and budgetary efficiency. Particular attention is paid to China in the article, since this country today has the greatest experience in the implementation of projects in the field of high-speed rail communication. The emergence of high-speed rail in China not only became a technological breakthrough, but also played an important role in stimulating the country’s economy and enhancing domestic demand. At the moment, 57% of all high-speed railways in the world are in China alone. The experience of the United States is also of scientific interest, in particular, in the consideration and evaluation of high-speed rail projects. Despite the high level of economic development in the United States, high-speed rail transport is practically undeveloped, which is largely due to historical reasons. Cheap oil, along with improvements to cars and airplanes, and government subsidies for highway and airport construction, have made these vehicles more accessible to most of the population and highlighted them. Despite these circumstances, the authorities of many states are interested in the implementation of high-speed rail projects. At the same time, the question of the possibility and expediency of switching passenger flows from existing modes of transport remains relevant in the United States. In the final part of the article, using the example of specific projects, the prospects for the development of high-speed railway communication in Russia are assessed and proposals for the development of the transport complex as a whole are given.

Full Span Precast and Launching Construction in Taiwan’s High Speed Rail Project

2010 ◽  
Author(s):  
James C. Tai ◽  
Dennis Jang ◽  
Heather Gaffney ◽  
John Flint
Keyword(s):  
Quality Control ◽  
High Speed ◽  
Design Quality ◽  
High Speed Rail ◽  
Box Girder ◽  
Construction Techniques ◽  
Design Build ◽  
Elevated Bridge ◽  
Bridge Structures ◽  
Design Speed

Taiwan’s North to South High Speed Rail project, with total cost of US$15 Billion and design speed of 350km/hour, includes 251km of elevated bridge structure within its total length of 345km. Among the bridge structures, 73% utilize full span precast and launching concrete construction techniques to achieve speedy, shortened construction periods and better quality control. It adopted the design-build delivery method to achieve single responsibility for construction in this private participated Build and Operate then Transfer to government program. The paper will briefly explain full span precast box girder of 30 to 35 meter weighing 750 to 840 ton and launching construction with several different types of launching equipment, precasting of the box girder process, storage yard quality control and launching techniques. The plant produced a 2 day cycle for each girder and reached 48 girders per month and a placement rate of 0.7 day per span installed. The design-build methods of assuring design quality and the independent checking process will be discussed. Taiwan High Speed Rail bridge structures’ design criteria will be outlined in the presentation.

scholarly journals Vehicle Bridge Interaction in High-Speed Rail Corridors

2021 ◽  
Vol 9 (8) ◽  
pp. 2268-2278
Author(s):  
Jitendra Rastogi
Keyword(s):  
Dynamic Analysis ◽  
High Speed ◽  
Vehicle Speed ◽  
High Speed Rail ◽  
Activity Increase ◽  
Transit System ◽  
Rail Network ◽  
Bridge Superstructure ◽  
Design Speed ◽  
Indian Railway

Abstract: In this paper, our aim is to establish that Dynamic impact factor (DIF) is not only dependent on the span and type of the bridge but also dependent upon speed of the train and distance between axles of the train as well. Our current code i.e. Indian Railway Standards specify that DIF or Coefficient of Dynamic Augment (CDA) is dependent on span length and type of bridge but it is applicable for design speed up to 160 kmph. For any speed greater than that CDA shall need to be computed as per the dynamic analysis as per available international codes. As mentioned earlier that there is imminent need of high-speed rail network in India due to increase in economic activity, increase in travel choices, improvement in mobility, reduction in congestion and to boost productivity. Our objective of this project is to study dynamic response of a various types of bridges under high speed trains currently being used in India for high speed rail projects like RRTS (Delhi to Meerut and other corridors) and High speed rail project from Mumbai to Ahmedabad to accurately assess the DIF in bridges under the effect of different governing factors (vehicle speed, vehicle load, bridge superstructure type, etc). This study could be beneficial in upcoming projects of high-speed rail as it is our future need. This study is based on the current semi-high-speed rail network i.e. Delhi Meerut Rapid Rail Transit System (RRTS) being constructed and other corridors are to be implemented. Design speed of this project is 180 kmph hence existing IRS codal provision for DIF cannot be used, therefore, dynamic analysis is needed to establish the DIF. Dynamic analysis has been carried out with two types of boggie length i.e. 21.34m and 22.34m. In this project, we have started with the understanding of dynamic analysis by mentioning various codal provisions and parameters influencing the DIF. Subsequently, procedures for computation of dynamic analysis for given superstructure, loading, train type, span, etc have been explained including the modelling part. Last part of this study covers the dynamic analysis of various types of superstructure for given data

Research on Prediction of High-Speed Rail Trains Delay Time

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Jing Shi ◽  
Qiyuan Peng ◽  
Ling Liu
Keyword(s):  
Delay Time ◽  
High Speed ◽  
High Speed Rail

THE HIGH-SPEED RAIL HANDBOOK: A TECHNICAL GUIDE1

2018 ◽  
Vol 8 (3) ◽  
pp. 515-530
Author(s):  
Massimo Zucchetti1,2 ◽  
◽  
Keyword(s):  
High Speed ◽  
High Speed Rail

High-Speed Rail Networks, Capacity Investments and Social Welfare

2019 ◽  
Author(s):  
Valentina Bracaglia ◽  
Tiziana D'Alfonso ◽  
Alberto Nastasi ◽  
Dian Sheng ◽  
Yulai Wan ◽  
...  
Keyword(s):  
Social Welfare ◽  
High Speed ◽  
High Speed Rail

The Impact of High-Speed Rail on the Spatial Structure of Chinese Urban Agglomerations

2020 ◽  
Vol 46 (3) ◽  
pp. 379-397
Author(s):  
Chunyang Wang
Keyword(s):  
High Speed ◽  
River Delta ◽  
City Size ◽  
High Speed Rail ◽  
Local Conditions ◽  
Urban Agglomerations ◽  
Large Cities ◽  
Spatial Systems ◽  
Economic Concentration ◽  
The Impact

This paper measures the spatial evolution of urban agglomerations to understand be er the impact of high-speed rail (HSR) construction, based on panel data from fi ve major urban agglomerations in China for the period 2004–2015. It is found that there are signi ficant regional diff erences of HSR impacts. The construction of HSR has promoted population and economic diff usion in two advanced urban agglomerations, namely the Yang e River Delta and Pearl River Delta, while promoting population and economic concentration in two relatively less advanced urban agglomerations, e.g. the middle reaches of the Yang e River and Chengdu–Chongqing. In terms of city size, HSR promotes the economic proliferation of large cities and the economic concentration of small and medium-sized cities along its routes. HSR networking has provided a new impetus for restructuring urban spatial systems. Every region should optimize the industrial division with strategic functions of urban agglomeration according to local conditions and accelerate the construction of inter-city intra-regional transport network to maximize the eff ects of high-speed rail across a large regional territory.

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