Accessibility-oriented performance evaluation of high-speed railways using a three-layer network model

Circuity, defined as the ratio of the shortest network distance to the Euclidean distance between one origin–destination (O-D) pair, can be adopted as a helpful evaluation method of indirect degrees of train paths. In this paper, the maximum circuity of the paths of operated trains is set to be the threshold value of the circuity of high-speed train paths. For the shortest paths of any node pairs, if their circuity is not higher than the threshold value, the paths can be regarded as the reasonable paths. With the consideration of a certain relative or absolute error, we cluster the reasonable paths on the basis of their inclusion relationship and the center path of each class represents a passenger transit corridor. We take the high-speed rail (HSR) network in China at the end of 2014 as an example, and obtain 51 passenger transit corridors, which are alternative sets of train paths. Furthermore, we analyze the circuity distribution of paths of all node pairs in the network. We find that the high circuity of train paths can be decreased with the construction of a high-speed railway line, which indicates that the structure of the HSR network in China tends to be more complete and the HSR network can make the Chinese railway network more efficient.

Transportation network and venture capital mobility: An analysis of air travel and high-speed rail in China

Benefits Assessment of Large Scale High-Speed Rail Network in China: The Effect on Low-Cost Carriers

This paper conducts a sustainability analysis on the newly opened Wuhan–Guangzhou High-Speed Railway (the Wuhan–Guangzhou Passenger Dedicated Line, or the Wuguang PDL) in China. This analysis focuses on the efficiency and equity aspects of this rail line's direct transportation impacts and indirect nontransportation impacts. The Wuguang PDL has significant transportation and nontransportation impacts on the cities and megaregions along the line. However, it still has generated geographic and social inequity issues yet to be addressed. Due to the opening of the Wuguang PDL, Hubei, Hunan, and Guangdong Provinces, along with the Wuhan, Changsha, and Pearl River Delta megaregions, will be more closely integrated with synergistic effects, although the benefits are still distributed unevenly across different regions.

The construction of twin cable-stayed railway bridges was undertaken near Changsha station of the Shanghai–Kunming high-speed railway (HSR) in China. Because of the inevitability of crossing the existing Wuhan–Guangzhou HSR line, the swing method was chosen so that the construction process does not interrupt the operation of the existing line. The objective of this study is to highlight the features of two cable-stayed bridges. Key structural components along with structural dimensions are discussed. Key issues associated with the structural design are analyzed, including the pylon–girder joint behavior, solar radiation temperature mode of through girder, track–bridge behavior, and the aerodynamic effects induced by high-speed trains. Finally, a brief account of the construction is given. The use of the swing method proved to be an effective solution to span existing HSR lines.

As essential pillars of passenger mobility and freight transport, road and rail transportation have experienced a rapid increase over the past years. This trend indicates an increase in energy consumption, especially electricity, due to higher energy efficiency and less carbon emission, but it exacerbates the contradiction between the power supply and demand. Nowadays, for additional power sources, increased solar power generation has been widely installed in their own available spaces for road and rail transportation, which has attracted a great deal of attention. This paper reviews the current status of solar power generation and its integrated application in the transport sector. Then, the photovoltaic generation potential of road and rail transportation in China are evaluated. Finally, further developments and perspectives of solar energy-powered road and rail transportation are presented, which not only contributes to lower-carbon and green transportation, but also promotes the development of renewable power generation for energy transformation. It is confirmed that solar energy-powered road and rail transportation is a promising approach for sustainable transportation with more renewable energy and less carbon emission.

Beijing-Tianjin Intercity Railway is the first high-speed railway in China. It is an important part of the inter-city railway transit network in the Bohai Rim. High-speed railway has the requirements of high smoothness and high stability to the subgrade. However, in recent years, due to the development of the city, ground subsidence caused by overexploitation of groundwater has caused serious threat to the safe operation of high-speed railway. Therefore, it is significant to conduct continuous observation and analysis for the deformation of high-speed railway and the environment along it.In this paper, TerraSAR-X data is mainly used to study the Beijing Tianjin inter-city railway（Beijing section）, and the Interferometric point targets analysis (IPTA) technique is applied to process the SAR data, so as to accurately estimate the ground deformation in this region. In addition, the results are verified by combining with the second-level leveling results in the range of the region, and the results obtained by this method have a better estimation of the deformation.The Maximal Information-based Nonparametric Exploration method is used to explore the relationship between the various influencing factors and the deformation of high-speed railway. The reasons of uneven settlement along the high-speed railway are analyzed synthetically by combining the results of deformation with the data of groundwater, geological strata, fault zone, aquifer system and precipitation in the area. This method can quantitatively describe the relationship between the above factors and the settlement point, more intuitive understanding its impact on the settlement of high-speed railway. The results show that during the observation period, serious spatiotemporal non-uniform settlement of the high-speed railway has occurred along it. Then the results of InSAR time series deformation and second-level leveling results are combined, the time series segmentation characteristics of deformation point is studied. Ground subsidence and the decrease of groundwater level has a better response. The increase of the groundwater exploitation quantity, resulting in the decrease of underground water level, leading to the settlement of the area increased. At the same time, the land subsidence has a certain relationship with the compressible layer thickness in this area. Through statistical analysis, the correlation between settlement and various factors are summed up to determine the key areas for settlement monitoring. Provide important decision support for the safe operation of high-speed railway.

A maximum noise-level prediction method for high-speed railways in China: A case study using the Baiyun campus of Guangdong polytechnic normal university

The development of the high-speed railway brings the growth of talent demand and the change of characteristics, especially the demand for high-tech, innovative and versatile talents. At present, there are problems and shortcomings in the talent structure of the railway, which requires cooperation of three sides: the government, the railway industry and universities. To reform cultivating modes of creative talents is the core and key point of the construction of talent team in an era of high-speed railway. 1.The Development of high-speed railway and the change of talent demand In the year 2005, the State Council passed national Long-term railway network planning, making clear the long-term goals and tasks for the construction of national railway network, depicting a grand blueprint of the railway network by the year 2020. It marked a new and massive construction of railways, which was based on promoting railway transport capacity and improving the level of the machinery equipment. China must comprehensively push forward technical innovation and institutional innovation, thereby by the year 2020 China will basically achieve railway modernization to meet requirements of national economic development. Although the high-speed railway in western countries had better theoretical basis and practical application, China's railway line for passenger traffic, with transport volume large, transport centralized and transport distance long, cannot indiscriminately imitate the high-speed railway technical system of any other country. Only by learning widely from other's strong points and basing on the independent innovation, combination of international advanced technology, research and independent innovation can China build a first-class system of the high-speed railway line for passenger traffic that fits our country. Prominent development of the railway need joint effort by lots of professionals from home and abroad. It is estimated that, to the year 2020, the rapid development of railway is in dire need of nearly 200,000 professionals. An important task that railway modernization confronts is to educate and cultivate railway talents, especially those with initiative spirit, innovative thinking and creative ability.

The article discusses the concept of energy-resource synergy in motor transport and in the motor transport system, as well as the main provisions of the methodology of technological innovation management in motor transport. Proposed: a new epistemological paradigm of the motor transport as a sphere of material production; technologically innovative concept of energy-resource synergy in the transport system; a set of methods for technologically innovative management of energy - resource quality of transport services and for resource-synergistic improvement of the functions of the transport system and the subsystem "Motor transport"; analytical model of the target function of strategic management in motor transport. A single energy- resource mechanism for the functioning of motor transport and the material integrity of the motor transport system has been established. The ways of innovative resource saving on transport and in infrastructure subsystems are revealed. The object of study is the structural and functional organization of motor transport and motor transport system. The purpose of the work is the formation of a system-synergistic target function of project management at highly technological and intensively resource-saving transport services based on the innovative requirements and the concept of energy-resource synergy in the transport system. The research method is a theoretical analysis and synthesis of the conceptual target function of the technology and innovation management in transport, taking into account the concept of energy-resource synergy in the transport system. The results of the article can be used to implement system-synergistic and conceptual-innovative management in transport and in other subsystems. Predicted assumptions about the development of the object of study are the implementation of a technologically innovative mechanism of energy-resource synergy in the motor transport and in the motor transport system, taking into account their structures and functions. KEYWORDS: CONCEPT, TECHNOLOGICAL INNOVATIONS, MOTOR TRANSPORT, SYSTEM, FUNCTIONS, RESOURCES, ENERGY-RESOURCE SYNERGY, LIFE CYCLE, QUALITY OF TRANSPORT SERVICES, MANAGEMENT.

The inverse dynamic analysis of vehicle-bridge (VB) systems provides a superior scheme for track irregularity identification using the onboard measurement data of vehicle dynamic responses. However, available algorithms face a great challenge when applied to high-speed railway bridges because of the increase in the number of unknown inputs, resulting in a degradation of identification accuracy. Here, we propose a condensation procedure to reduce the unknown inputs of the VB system, and then propose a novel algorithm for track irregularity identification using the augmented Kalman filter. A numerical simulation of a real continuous three-span simply supported railway bridge was conducted to validate the estimation accuracy of the proposed algorithm. Numerical results illustrate that the proposed algorithm can accurately estimate the track irregularities by using the vertical acceleration responses of the vehicle body only, thanks to the unknown input condensation. A comparative study demonstrates that the proposed algorithm outperforms the conventional track irregularity identification methods in terms of estimation accuracy. To evaluate the actual performance of the proposed algorithm, a set of onboard measurement data recorded by a typical high-speed train when running on the Hangzhou–Changsha high-speed railway in China was employed to identify the track irregularities of the railway line, and the results suggest that the proposed algorithm is highly efficient and low in cost. This study may help develop highly efficient real-time track irregularity monitoring in the years ahead.

Solid concrete piers with low longitudinal reinforcement ratio are extensively used in high-speed railway in China. However, how to check such structures is not specified in current technical codes. Checking these structures by eccentricity and stress indexes is discussed hereby. The moment-curvature relationships for piers of various reinforcement ratios are presented by employing the software UCfyber and these moments are compared with moments calculated by allowable stress approach, moments corresponding to the code-specified permissible eccentricity, moments corresponding to the allowable reinforcement stress and stabilizing moments induced by tensile reinforcement and self-weight of the piers, respectively. The results show that the allowable stress approach could be used to check the strength and eccentricity of solid concrete piers with low longitudinal reinforcement ratio in high-speed railway; the restriction on permissible eccentricity may be to a proper extent relaxed for such piers, based on the fact that tensile reinforcement provides an additional stabilizing moment and the reinforcement contributes to the pier’s bearing capacity.

High-speed railway and urban sectoral employment in China

High-Speed Railways (HSR) is currently regarded as one of the most significant technological breakthroughs in passenger transportation developed in the second half of the 20th century. At the beginning of 2008, there were about 10,000 kilometers of new high-speed lines in operation in Asia and Europe regions to provide high-speed services to passengers willing to pay for lower travel time and quality improvement in rail transport. And since 2010, HSR itself has received a great deal of attention in Indonesia. Some transportation analysts contend that Indonesia, particularly Java and Sumatera islands need a high-speed rail network to be economically competitive with countries in Asia and Europe. On April 2016, Indonesia-China consortium Kereta Cepat Indonesia China (KCIC) signed an engineering, procurement, and construction contract to build the HSR with a consortium of seven companies called the High-Speed Railway Contractor Consortium. The HSR is expected to debut by May 2019, offering a 45-minute trip covering a roughly 150 km route. However, building, maintaining and operating HSR line is expensive; it involves a significant amount of sunk costs and may substantially compromise both the transport policy of a country and the development of its transport sector for decades. The main objective of this paper is to discuss some characteristics of the HSR services from an economic viewpoint, while simultaneously developing an empirical framework that should help us to understand, in more detail, the factors determining the success of the HSR as transport alternative based on current experiences of selected Asian and European countries.

In this paper, the functions of the received power-distance were deduced and analyzed under the different train operating conditions at first. Based on these functions, an improved path loss model, the triple-slope path loss model, for high-speed railway control signal was raised. And the proposed path loss model was verified by the test data at high speed railways in China. The application area of the proposed model, the error analysis between the proposed model and the experiment data was outlined in this paper too.