Progress in high-speed train technology around the world

Zhou, Li; Shen, Zhikang

doi:10.1007/bf03325733

Cited by 50 publications

(21 citation statements)

References 4 publications

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“…In the Republic of Korea, a high-speed electric multiple-unit 430 km/h experiment (HEMU-430X) has been developed to operate at a maximum speed of 430 km/h. In addition, the Great Train eXpress (GTX), a new high-speed transportation system, has been established with the aim of constructing a 300 km/h train network in all regions by 2025 [2]. Elon Musk presented a new high-speed tube-train concept called the "Hyperloop" in 2013 [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Aerodynamic Characteristics of Hyperloop System

Kang

Ham

et al. 2019

Energies

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The Hyperloop system is a new concept that allows a train to travel through a near-vacuum tunnel at transonic speeds. Aerodynamic drag is one of the most important factors in analyzing such systems. The blockage ratio (BR), pod speed/length, tube pressure, and temperature affect the aerodynamic drag, but the specific relationships between the drag and these parameters have not yet been comprehensively examined. In this study, we investigated the flow phenomena of a Hyperloop system, focusing on the effects of changes in the above parameters. Two-dimensional axisymmetric simulations were performed in a large parameter space covering various BR values (0.25, 0.36), pod lengths (10.75–86 m), pod speeds (50–350 m/s), tube pressures (~100–1000 Pa), and tube temperatures (275–325 K). As BR increased, the pressure drag was significantly affected. This is because of the smaller critical Mach number for a larger BR. As the pod length increased, the total drag and pressure drag did not change significantly, but there was a considerable influence on the friction drag. As the pod speed increased, strong shock waves occurred near the end of the pod. At this point, the flows around the pod were severely choked at both BR values, and the ratio of the pressure drag to the total drag converged to its saturation level. At tube pressures above 500 Pa, the friction drag increased significantly under the rapidly increased turbulence intensity near the pod surface. High tube temperatures increase the speed of sound, and this reduces the Mach number for the same pod speed, consequently delaying the onset of choking and reducing the aerodynamic drag. The results presented in this study are applicable to the fundamental design of the proposed Hyperloop system.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Aerodynamic Characteristics of Hyperloop System

Kang

Ham

et al. 2019

Energies

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“…Especially, to meet the requirements of high‐speed operation of locomotive, the massive railways need to be laid on the viaducts. The long and large viaducts occupy 46% in the total line length of Tokaido Shinkansen in Japan, and the corresponding proportion is up to 87% in the Shinkansen of Shanyang, Japan . Similarly, the proportion of viaducts in China HSR is also about 50% to 60% .…”

Section: Introductionmentioning

confidence: 98%

“…The long and large viaducts occupy 46% in the total line length of Tokaido Shinkansen in Japan, and the corresponding proportion is up to 87% in the Shinkansen of Shanyang, Japan. 25 Similarly, the proportion of viaducts in China HSR is also about 50% to 60%. 26 For example, the overall length of Beijing-Guangzhou HSR in China is around 2200 km, where 80% is the viaduct.…”

Section: Introductionmentioning

confidence: 99%

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Wang

Liu

et al. 2017

Int Trans Electr Energ Syst

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Summary In single‐phase alternating current (AC) traction power supply system, to balance 3‐phase load of power system, each phase of electricity is used in rotation. Based on the 7‐section articulated split‐phase insulator of China Beijing‐Tianjin high‐speed railway line, different electromagnetic transient processes are deeply analyzed considering pantograph arc and viaduct's electrical coupling in this paper. First, based on the lumped parameter model, the process of high‐speed train passing the articulated split‐phase region, concluding the upper viaduct part and the lower viaduct part, is deeply studied. Second, through state‐space technique, 4 independent electromagnetic transient processes in articulated split‐phase region of high‐speed railway are derived and analyzed thoroughly considering the impact of pantograph arc and viaduct. Finally, the integral transient process is accurately simulated and analyzed by ATP‐EMTP software under several circumstances, such as different topologies, initial phase and phase difference of feeders, and specific suppression overvoltage measures. The independent and integral comparison results illustrate that the coupled viaduct can lead to the more complex topologies and electromagnetic transient processes. Also, the coupled viaduct can play a significant topology discharge and pantograph overvoltage suppression role for the high‐speed train passing articulated split‐phase region.

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“…People are looking forward to a transport mode that will be faster, cleaner, and environmentally friendly. The speed of high-speed railway is 350 km/h [1], the speed of the Shanghai Maglev in operation in China is 430 km/h [2], and that of Yamanashi Maglev in Japan has reached 581 km/h [3]. However, they are not the ideal speeds compared to evacuated tube transportation (ETT), and those trains create high aerodynamic noise and resistance.…”

Section: Introductionmentioning

confidence: 99%

Key vacuum technology issues to be solved in evacuated tube transportation

Zhang

Oster²,

Kumada³

et al. 2011

J. Mod. Transport.

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Evacuated tube transportation (ETT) will be one of the ultra-large-scale vacuum application areas. This paper lists some key vacuum technology issues in ETT: (1) how to construct ultra-large-scale vacuum chamber with lower cost and high reliability, (2) how to evacuate gas out of the ETT tube in short time, (3) how to release heat or reduce temperature in the vacuum tube, (4) how to avoid vacuum discharge, (5) how to make vehicles with airproof shells and life support system, and (6) how to detect leaks and find leak positions efficiently. At the same time, some solutions are proposed.

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Progress in high-speed train technology around the world

Cited by 50 publications

References 4 publications

Numerical Analysis of Aerodynamic Characteristics of Hyperloop System

Numerical Analysis of Aerodynamic Characteristics of Hyperloop System

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Key vacuum technology issues to be solved in evacuated tube transportation

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