Gotowe bibliografie tematyczne / HIGH SPEED TRACK

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Gotowa bibliografia na temat „HIGH SPEED TRACK”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "HIGH SPEED TRACK"

Fazio, Alfred E., i J. L. Corbin. "Track Quality Index for High Speed Track". Journal of Transportation Engineering 112, nr 1 (styczeń 1986): 46–61. http://dx.doi.org/10.1061/(asce)0733-947x(1986)112:1(46).

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Zicha, Jan H. "High‐Speed Rail Track Design". Journal of Transportation Engineering 115, nr 1 (styczeń 1989): 68–83. http://dx.doi.org/10.1061/(asce)0733-947x(1989)115:1(68).

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Týfa, Lukáš, Jan Kruntorád i Ondřej Tomaschko. "Railway superstructure for high-speed rails". Acta Polytechnica CTU Proceedings 31 (14.07.2021): 53–57. http://dx.doi.org/10.14311/app.2021.31.0053.

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The construction of the track is solved as a conventional (with track ballast) or as a ballastless track (without track ballast). When deciding on the choice of the most suitable track design for high-speed rail, it is necessary to emphasize that with increasing line speed, the requirements for the quality of the track geometry increase, including the size of the deviations of individual geometric parameters of the track from the projected values. When assessing the choice of track structure – especially for high-speed rails – it is therefore necessary and correct to assess the total costs (investment and operational) for a sufficiently long time. DB Netz AG’s present experience with a ballastless track since its first implementation in 1972 in Rheda station, for almost 50 years, shows that the required lifetime of 60 years has its real justification. In addition, current research and development in the field of ballastless track is moving towards extending the life of ballastless track well beyond this limit. The paper is focused on the comparison a ballasted and ballastless track construction. It deals in more detail with evaluation of the advantages and disadvantages of a ballastless track construction. The main objective is to assess the use of ballastless track structure for the construction of high-speed lines.

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Li, Ting, Qian Su, Kang Shao i Jie Liu. "Numerical Analysis of Vibration Responses in High-Speed Railways considering Mud Pumping Defect". Shock and Vibration 2019 (7.05.2019): 1–11. http://dx.doi.org/10.1155/2019/9707909.

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As a newly appeared defect under slab tracks in high-speed railways, mud pumping weakens the support ability of the subgrade to slab track, bringing about deviations on the vibration responses of the vehicle, slab track, and subgrade. Therefore, this paper proposes a vehicle-slab track-subgrade coupled model based on the multibody simulation principle and the finite element theory to highlight the influences of mud pumping defect. As an external excitation to this model, random track irregularity is considered. In order to simulate the mud pumping defect, the contact between the concrete base and subgrade is described as a spring-damper system. This model is validated by field test results and other simulation results, and a very good agreement is found. The vibration responses of the vehicle, slab track, and subgrade under different mud pumping lengths and train speeds are studied firstly. The deviations of vibration responses in high-speed railways induced by mud pumping are then obtained, and the limited mud pumping length is put forward finally to provide a recommendation for maintenance works of high-speed railways in practice.

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Liang, Kang, Qunzhang Tu, Xinmin Shen, Juying Dai, Qin Yin, Jinhong Xue i Xuan Ding. "Modeling and Verification of Rolling Resistance Torque of High-Speed Rubber Track Assembly Considering Hysteresis Loss". Polymers 15, nr 7 (25.03.2023): 1642. http://dx.doi.org/10.3390/polym15071642.

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Due to the viscoelasticity of rubber materials, hysteresis loss due to deformation is the main reason for the rolling resistance of high-speed rubber tracks. Since the structure and material of high-speed rubber track assemblies are different from traditional tires and metal tracks, the rolling resistance theory of traditional wheeled and tracked vehicles is not applicable. Therefore, in order to determine the rolling resistance scientifically and accurately, the mechanism research of the rolling resistance of high-speed rubber track assembly is the key to the design of high-speed rubber crawler vehicles. In this paper, the stress–strain characteristics of rubber track under the action of compression, tension, bending, and driving were studied. The strain load spectrum of rubber tracks was established, and the strain cyclic load was extracted by the rainflow method. The temperature model of the rubber track was developed based on its dynamic characteristics. On the basis of energy conservation, the hysteresis loss of rubber is equivalent to the energy consumption of rolling resistance, and the theoretical model of rolling resistance of high-speed rubber track assembly is established. In accordance with the model above, the key influencing factors and changing trends of rolling resistance are analyzed, which provides a theoretical basis for the performance optimization of high-speed rubber track assembly.

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Krylov, V. V., A. R. Dawson, M. E. Heelis i A. C. Collop. "Rail movement and ground waves caused by high-speed trains approaching track-soil critical velocities". Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 214, nr 2 (1.03.2000): 107–16. http://dx.doi.org/10.1243/0954409001531379.

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The increased speeds of modern trains are normally accompanied with increased transient movements of the rail and ground, which are especially high when train speeds approach some critical wave velocities in the track-ground system. These transient movements may cause large rail deflections, as well as structural vibrations and associated noise in nearby buildings. There are two main critical wave velocities in the track-ground system: the velocity of the Rayleigh surface wave in the ground and the minimum phase velocity of bending waves propagating in the track supported by ballast, the latter velocity being referred to as the track critical velocity. Both these velocities can be exceeded by modern high-speed trains, especially in the case of very soft soil where both critical velocities become very low. The discussion in this paper focuses on the effects of transient rail deflections on associated ground vibrations in the cases of train speeds approaching and exceeding Rayleigh wave and track critical velocities. The obtained theoretical results are illustrated by numerical calculations for TGV and Eurostar high-speed trains travelling along typical tracks built on soft soil.

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Esveld, Coenraad. "Developments in High-Speed Track Design". IABSE Symposium Report 87, nr 12 (1.01.2003): 37–45. http://dx.doi.org/10.2749/222137803796328782.

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Zhang, Qin, Xiaoning Zhu i Li Wang. "Track Allocation Optimization in Multi-Direction High-Speed Railway Stations". Symmetry 11, nr 4 (1.04.2019): 459. http://dx.doi.org/10.3390/sym11040459.

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Track allocation optimization in railway stations is one of the most fundamental problems for scheduling trains, especially in multi-direction high-speed railway stations. With the construction of high-speed rail networks, this kind of station has become increasingly common. However, the track allocation depends not only on the station tracks, train timetable, and rolling stock plan, but also on the resources in the station throat area. As a result, an effective track allocation plan becomes significant but also difficult. In this paper, we consider all these factors to make the results more practicable and an integer linear model that minimizes the total occupation time of resources in the throat area is presented. A flexible track utilization rule is also adopted to this model to fit the characteristics of the multi-direction station. Meanwhile, a detailed explanation of resources’ occupation time is illustrated to facilitate the representation of the conflicting constraints. To resolve these issues, we use a commercial solver with its default parameters. A computational experiment of a station is conducted to verify the effectiveness of the proposed model. The resources utilization plan indicates that the capacity of a station is limited by the throat area, rather than by the station tracks.

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Gao, Yin, Hai Huang, Carlton L. Ho i James P. Hyslip. "High speed railway track dynamic behavior near critical speed". Soil Dynamics and Earthquake Engineering 101 (październik 2017): 285–94. http://dx.doi.org/10.1016/j.soildyn.2017.08.001.

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Li, Wei, Xuecheng Bian, Xiang Duan i Erol Tutumluer. "Full-Scale Model Testing on Ballasted High-Speed Railway: Dynamic Responses and Accumulated Settlements". Transportation Research Record: Journal of the Transportation Research Board 2672, nr 10 (13.07.2018): 125–35. http://dx.doi.org/10.1177/0361198118784379.

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High-speed trains generate much higher vibrations in track structures than conventional trains and intensive train passages (e.g., on the Beijing–Shanghai high-speed railway line where the train passage interval is less than 5 minutes) cause accumulated permanent settlement in the railway track substructures, which will decrease track performance and jeopardize the safety of trains. Since very few field measurements on ballasted high-speed railways are available in literature, this paper presents experimental results of vibration velocity, dynamic soil stress, and the accumulated settlement of a ballasted high-speed railway from a full-scale model testing facility with simulated trains moving loads at various speeds. A portion of a realistic ballasted railway consisting of track structure, ballast layer, subballast, embankment, and piled foundation was constructed in a larger box. An eight-actuator sequential loading system was used to generate equivalent vertical loadings on the track structure for simulating the dynamic excitations due to train movements. Dynamic stresses measured in the track substructure layers (ballast, subballast, and embankment) were found to be strongly dependent on train speeds especially for speeds higher than 144 km/h. It was found that both the vibration velocity and the dynamic soil stress were greatly amplified as the train speed increased to 300 km/h, and the ballast layer effectively reduced the vibrations transmitted from the track structure to underlying soil. The accumulated settlement of the substructure did not reach a stable state even after 100,000 moving train loads at a speed of 300 km/h.

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Rozprawy doktorskie na temat "HIGH SPEED TRACK"

Michas, Georgios. "Slab track systems for high-speed railways". Thesis, KTH, Väg- och banteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96507.

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In the last 40 years an increase in train speed and axle load around the world and other challenges in the conventional ballasted track system gave birth to ballastless railway track system. This study examines in depth the various slab track systems that are being used today. Their design characteristics as well as the various requirements for efficient use are thoroughly explained. At least 34 different ballastless systems have been recorded in many railway networks throughout the world. The most significant slab track systems are analysed in detail and compared. Slab track designs have significant advantages comparing to ballasted tracks. The most significant are the high stability of the track, the almost non-existent need for maintenance, the long life cycle (60 years) and the reduced weight and height of the track. Their disadvantages against the ballasted tracks are mainly summarized in their higher construction costs. The Finite Element package ABAQUS/CAE is used to model a 3-D slab track design under static traffic loading. The results suggest that slab tracks have profoundly better stability and durability comparing to ballasted tracks mainly due to their higher stiffness and strength. The author underlines the need for further studies to undoubtedly prove the claimed advantages of slab track systems as well as to improve the costs associated with construction.

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Fesharaki, Mohammad. "3-D Dynamic Analysis of High-Speed Railroad Track". FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3366.

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High-Speed Rail (HSR) as a fast, reliable and environmentally friendly mode of transportation has received a lot of attention in recent decades. The International Union of Railways reported that there are more than 18600 miles of HSR in operation and about 1.6 billion passengers per year are carried by them. Although there are plans for HSR in many states including Florida, the United States, however, is still hesitant to develop its own HSR network. One of the main barriers to developing high-speed rail is excessive vibration propagation to the media which may cause annoyance to people who live in the track neighborhood. Train induced vibration also contributes to track settlement, developing track flaws, and increasing life cycle cost of track and supporting structures. The aim of this research is to address this problem by conducting a comprehensive investigation into track dynamics. For this purpose, three-dimensional mass-spring-damper models of vehicle, track and supporting structures were developed and matrices of mass, stiffness, and damping of each subsystem were formed. The response of the whole system was, then, determined by coupling the subsystems using Hertz contact theory. The differential equations of the coupled system were solved by the Newmark integration method and the results including vertical and lateral displacements and forces were presented in the time domain. Since the purpose of this dissertation is to quantify the effect of track and vehicle condition on vibration level, rail defects were also taken into account and rail random irregularities for the vertical profile, Gauge, alignment and cross level (super elevation) were incorporated into a numerical solution. The results of the study show the effect of track and vehicle parameters on the response of the vehicle, track, and substructures. Since Florida and some other states in the United States are very prone to hurricanes, an investigation was conducted into the effect of wind speed on vehicle stability. For this purpose, a curved beam was modeled to consider the influence of track curvature, cant deficiency, wind speed and train speed simultaneously. The results from the study show the maximum allowable values of train speed and axle load for different wind speeds. The findings can be used to decide under what circumstances there is a risk of vehicle overturning and how to avoid it.

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Sárik, Veronika. "Decision-making model for track system of high-speed rail lines : Ballasted track, ballastless track or both?" Thesis, KTH, Byggvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226308.

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During the 50 years of existence of high speed railways, the track structure solutions have developed both in number and in type. As of today, in case of conventional railway, there are 2 main types one could mention: ballasted and ballastless track solutions. However, there is no standardized procedure for choosing between these systems and between their respective variants, the decision is made on a case-by-case basis. This thesis aims to create a generic framework for decision making, primarily taking into account technical details. The model, the input parameters and variables can be easily adjusted and customized based on national standards, practices or other considerations, but the primary focus in the thesis have been the current Swedish regulations. The thesis has an overview on the influencing factors and attempts to include the most crucial ones of these into a decision-making model. This model compares 3 alternatives, namely the ballastless alternative, the ballasted alternative and the alternating system option, in which case the track system selection happens based on local factors, such as geotechnical conditions. These are considered and evaluated through Fuzzy logic, which supports the system selection affected by various sources of uncertainty. The decision is finally made through an LCC calculation. In order to handle the great uncertainties in the data used in the LCC, a Monte Carlo simulation is performed. The main added value of the thesis is considered to be the methodology for choosing the systems based on life-cycle cost after careful technical evaluation. This approach might provide basis for decision for track systems of high speed rail lines.

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Karis, Tomas. "Track Irregularities for High-Speed Trains : Evaluation of their correlation with vehicle response". Thesis, KTH, Järnvägsteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156640.

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Shimatake, Masao. "A track maintenance model for high-speed rail : a systems dynamics approach". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43385.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
Vita.
Includes bibliographical references (leaves 174-175).
by Masao Shimatake.
M.S.

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Mohlén, Marcus, Jesper Malmberg i Filip Hahrs. "Dimensioning of slabs for high-speed railway lines". Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-54091.

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The Swedish Transport Administration has been giving the task to set up a new standard for concrete slabs for the new high-speed railway in Sweden. They are demanding that the concrete slabs must be dimensioned according to the German Beton Kalender 2000. This report will explore the results when dimensioning a slab track, according to the German Beton Kalender 2000. Moment capacity, deformation, and crack width are calculated according to two structural theories, namely slab and beam theory, and a comparison between the two methods is presented.

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Leung, Joseph, Michio Aoyagi, Donald Billings, Herbert Hoy, Mei Lin i Fred Shigemoto. "A MOBILE RANGE SYSTEM TO TRACK TELEMETRY FROM A HIGH-SPEED INSTRUMENTATION PACKAGE". International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607380.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California
As renewal interest in building vehicles based on hypersonic technologies begin to emerge again, test ranges anticipating in supporting flight research of these vehicles will face a set of engineering problems. Most fundamentals of these will be to track and gather error free telemetry from the vehicles in flight. The first series of vehicles will likely be reduced-scale models that restrict the locations and geometric shapes of the telemetry antennas. High kinetic heating will further limit antenna design and construction. Consequently, antennas radiation patterns will be sub-optimal, showing lower gains and detrimental nulls. A mobile system designed to address the technical issues above will be described. The use of antenna arrays, spatial diversity and a hybrid tracking system using optical and electronic techniques to obtain error free telemetry in the present of multipath will be presented. System tests results will also be presented.

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Scoughton, Troy E., i Robert Danford. "A HIGH DATA RATE TELEMETRY PROCESSING SYSTEM FOR THE HIGH SPEED TEST TRACK AT HOLLOMAN AFB". International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613480.

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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada
The system covered in this paper is the Telemetry Processing System (TPS) designed and installed for processing data acquired from high speed test sleds at Holloman AFB, NM. Because this facility operates as a test range, testing sleds from many different agencies for a variety of different purposes, prior knowledge is not always available concerning the instrumentation on the test sled to be used and therefore the type of data retrieval and processing required. The TPS must then be capable of acquiring and processing multiple data types including PAM and PDM, multiple FM streams (72 channels) and high speed PCM (4 channels) . Additionally, the requirement has been imposed for 3.2 Msample/sec analog-to-digital conversion capability for high resolution measurement of certain analog data (10 channels). When the above data are multiplexed with three time sources, eight channels of sled positional information and operated at maximum rate, the raw data exceed 15 Mbytes/sec. Depending on the scheme used to tag the samples, time stamp the data, and convert the data to engineering units, the processed data rate could have exceeded 100 Mbytes/sec and therefore the reasonable limit of existing telemetry processing technology. The TPS requires not only the capability to acquire and record this very high rate data, but also the realtime display of selected measurements. Further, the acquired data must be readily available immediately after the test for quick look evaluation, and for data selection for archival storage. This paper will explore the design process that allows the system to meet these requirements using mostly off-the-shelf or only slightly modified equipment by making clever compromises and effective use of stream separation. The paper will explore the hardware and software considerations which were examined and the solutions implemented in the final design. Development and integration of this system are currently underway, with delivery scheduled for later this year.

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Lia, Anne Margrethe. "Life Cycle Assessment of Technical Solutions for High-Speed Rail: Tunnel and Track designs". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18706.

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On the 19th of February 2010, the Ministry of Transport and Communication presented the Norwegian National Rail Administration with the task of assessing different aspects of the future of high-speed rail in Norway. The report, the Norwegian High-Speed Rail Assessment (NHSRA), consist three separate evaluations where the climate assessment by Bergsdal et al. (2012), motivated this thesis. Results from the report identify the railway infrastructure as the dominant emission source for the corridor, with the length of tunnels representing the determining factor. Simultaneously, an ongoing debate is comparing the safety and performance of track and tunnel technologies traditionally used in Norway to that of foreign tunnelling technology such as the drill and blast method which apply a full cast (European method), and a double shielded tunnel boring machine (TBM). The newest development in track technology is the slab track, which is now evaluated for tunnels and bridges in Norway (Jernbaneverket 2011). This thesis contributes to the ongoing debate concerning the construction of infrastructure for high-speed rail in Norway, by emphasizing the environmental impact of several relevant technologies and geological conditions. The assessment includes an evaluation of the impact of different tunnelling and track technologies, calculated for operation speeds of both 250km/h and 330km/h. Further, the environmental impact of different levels of support work and grout is assessed. In addition, this thesis includes a sensitivity analysis of the impact of service life for railway components. The assessment is calculated for two functional units: one meter tunnel and tunnel track, and for the case corridor, the potential high-speed rail corridor between Oslo-Stavanger, estimated for 250km/h obtained from the NHSRA by Bergsdal et al. (2012).Our results from this assessment account for the use of cement, steel and copper as the environmentally most important materials. Among the railway components, the tunnel lining and grout constitute the highest emission level of the case corridor. The different technical alternatives are compared against the technologies traditionally applied in Norway, and an average level of support work, which represents the baseline results of this thesis. Our results indicate that the double shielded tunnel-boring machine is the technology that contributes to the highest increase of emission level compared to baseline. Further, the variables that hold the greatest potential of reducing total emission level is the installation of slab track in tunnels and bridges, and level of grout in the tunnel construction.

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Rashid, Shahbaz. "Parametric study of bridge response to high speed trains, ballasted track on concrete bridges". Thesis, KTH, Bro- och stålbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99385.

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When a train enters a bridge, passenger sitting inside will feel a sudden bump in the track, which not only affect the riding comfort of the passengers but also put a dynamic impact on the bridge structure. Due to this impact force, we have very serious maintenance problems in the track close to the bridge structure. This sudden bump is produced when train travelling on the track suddenly hit by a very stiff medium like bridge structure. In order to reduce this effect, transition zones are introduced before the bridge so that the change in stiffness will occur gradually without producing any bump. This master thesis examine the effect of track stiffness on the bridge dynamic response under different train speeds from 150 to 350 km/h with interval 5 km/h and also estimate the minimum length of transition zones require to reduce the effect of change in stiffness on the bridge. Study also gives us some guidelines about the choice of loading model of the train, location of maximum vertical acceleration, effect of ballast model on the results and minimum length of transition zone needs to include in the bridge-track FE-model, for dynamic analysis of the concrete bridges. To carry out this research MATLAB is used to produce an input file for the ABAQUS FEM program. ABAQUS will first read this file, model the bridge and then analysis the bridge. MATLAB will again read the result file, process the result data and plot the necessary graphs. The Swedish X2000 train is used for this study, which has been modeled with two different methods: moving load model and sprung mass model, in order to see the difference in results. For verification of the MATLAB-ABAQUS model, a 42m long bridge is analysed and results are compared with known results. In this study, concrete simply supported bridges with spans of 5, 10, 15, 20, 25 m have been analysed.

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Książki na temat "HIGH SPEED TRACK"

Lei, Xiaoyan. High Speed Railway Track Dynamics. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4593-8.

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Lei, Xiaoyan. High Speed Railway Track Dynamics. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2039-1.

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Rui, Calçada, red. Track-bridge interaction on high-speed railways. London, UK: Taylor & Francis, 2008.

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Samavedam, G. Safety of high speed ground transportation systems: Track lateral shift : fundamentals and state-of-the-art review. Washington, D.C: U.S. Dept. of Transportation, Federal Railroad Administration, Office of Research and Development, 1996.

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On track: The archaeology of High Speed I Section I in Kent. Oxford: Oxford Wessex Archaeology, 2011.

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Irvine, Kenneth. Fast track forward: Proposals for a UK high speed network to Europe. London: Adam Smith Institute, 1990.

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Meunier, Jacob. On the fast track: French railway modernization and the origins of the TGV, 1944-1983. Westport, Conn: Praeger, 2002.

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United States. Congress. House. Committee on Transportation and Infrastructure. Subcommittee on Railroads. Getting Acela back on track: Hearing before the Subcommittee on Railroads of the Committee on Transportation and Infrastructure, House of Representatives, One Hundred Ninth Congress, first session, May 11, 2005. Washington: U.S. G.P.O., 2005.

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author, Liu Xiaohong 1968, red. Gao su tie lu wu zha gui dao hong nian tu lu ji chen jiang kong zhi yu dong li wen ding xing: Red clay subgrade settlement control and dynamic stability analysis of ballastless track of high speed railway. Beijing: Zhongguo tie dao chu ban she, 2011.

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A, Reichert Bruce, i United States. National Aeronautics and Space Administration., red. Ethylene trace-gas techniques for high-speed flows. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Części książek na temat "HIGH SPEED TRACK"

Lei, Xiaoyan. "Fourier Transform Method for Dynamic Analysis of the Track StructureTrack Track Structure Style". W High Speed Railway Track Dynamics, 57–106. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_3.

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Lei, Xiaoyan. "Track Dynamics Research Contents and Related Standards". W High Speed Railway Track Dynamics, 1–36. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_1.

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Lei, Xiaoyan. "Dynamic Analysis of the Vehicle-Track Coupling System with Finite Elements in a Moving Frame of Reference". W High Speed Railway Track Dynamics, 271–300. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_10.

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Xiaoyan, Lei. "Model for Vertical Dynamic Analysis of the Vehicle-Track-Subgrade-Ground Coupling System". W High Speed Railway Track Dynamics, 301–22. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_11.

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Lei, Xiaoyan. "Analysis of Dynamic Behavior of the Train, Ballast Track, and Subgrade Coupling System". W High Speed Railway Track Dynamics, 323–40. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_12.

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Lei, Xiaoyan. "Analysis of Dynamic Behavior of the Train, Slab Track, and Subgrade Coupling System". W High Speed Railway Track Dynamics, 341–64. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_13.

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Lei, Xiaoyan. "Analysis of Dynamic Behavior of the Transition Section Between Ballast Track and Ballastless Track". W High Speed Railway Track Dynamics, 365–76. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_14.

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Lei, Xiaoyan. "Environmental Vibration Analysis Induced by Overlapping Subways". W High Speed Railway Track Dynamics, 377–407. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_15.

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Lei, Xiaoyan. "Analytic Method for Dynamic Analysis of the Track Structure". W High Speed Railway Track Dynamics, 37–56. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_2.

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Lei, Xiaoyan. "Analysis of Vibration Behavior of the Elevated Track Structure". W High Speed Railway Track Dynamics, 107–36. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2039-1_4.

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Streszczenia konferencji na temat "HIGH SPEED TRACK"

Marquis, Brian, Jon LeBlanc i Ali Tajaddini. "Examination of Vehicle Performance at High Speed and High Cant Deficiency". W 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56066.

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In the US, increasing passenger speeds to improve trip time usually involves increasing speeds through curves. Increasing speeds through curves will increase the lateral force exerted on track during curving, thus requiring more intensive track maintenance to maintain safety. These issues and other performance requirements including ride quality and vehicle stability, can be addressed through careful truck design. Existing high-speed rail equipment, and in particular their bogies, are better suited to track conditions in Europe or Japan, in which premium tracks with little curvature are dedicated for high-speed service. The Federal Railroad Administration has been conducting parametric simulation studies that examine the performance of rail vehicles at high speeds (greater than 90 mph) and at high cant deficiency (greater than 5 inches). The purpose of these analyses is to evaluate the performance of representative vehicle designs subject to different combinations of track geometry variations, such as short warp and alinement.

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Marquis, Brian, i Robert Greif. "High Speed Curving Performance of Rail Vehicles". W 2015 Joint Rail Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/jrc2015-5620.

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On March 13, 2013, the Federal Railroad Administration (FRA) published a final rule titled “Vehicle/Track Interaction Safety Standards; High-Speed and High Cant Deficiency Operations” which amended the Track Safety Standards (49 CFR Part213) and the Passenger Equipment Safety Standards (49 CFR Part 238) in order to promote VTI safety under a variety of conditions at speeds up to 220 mph [1]. Among its main accomplishments, the final rule facilitates the expansion of higher speed passenger rail by revising the standards governing permissible operating speed in curves, allowing for higher cant deficiencies in all FRA Track Classes. To ensure safety is not diminished, the FRA Track Safety Standards require railroads to maintain their tracks to stricter track geometry standards whenever they operate at these higher curving speeds and cant deficiencies. These revisions were based on studies that examined the dynamic curving performance of various representative rail vehicles. This research investigates the steady-state curving performance of truck designs while traversing curves at various curving speeds and cant deficiencies. During steady-state curve negotiation, the axles of trucks generally offset laterally from the track centerline and develop angles of attack increasing the wheel-rail contact forces. Large lateral forces can develop, particularly in flange contact, resulting in increased wheel and rail wear, track panel shift, and the risk of derailment. Depending on the truck design, such forces become larger at higher cant deficiency. An understanding of the steady-state response of a rail vehicle in a curve is essential as it represents a significant part of the total dynamic response. The curving performance of an idealized rigid truck is analyzed using nonlinear analytical methods for a wide range of operating speeds and unbalance conditions. Emphasis is placed on higher speed curving and the results are used to interpret trends observed during recent field testing with Amtrak’s Acela High-Speed Trainset on the Northeast Corridor.

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Peterson, Blaine O. "High Speed Rail: Track Construction Considerations". W 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56021.

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This paper discusses general High Speed Rail (HSR) track geometry, construction and maintenance practices and tolerances. The discussion will reference several key international projects and highlight different construction methods and the track geometry assessments used to establish and ensure serviceability of a typical HSR system. Historically, established tighter tolerances of “Express” HSR (i.e. operating speeds greater than 240 km/h or 150 mph) systems have favored the use of slab track systems over ballasted track systems. Slab track systems offer greater inherent stability while ballasted track systems generally require more frequent track geometry assessments and anomaly-correcting surfacing operations. The decisions related to which system to use for a given application involve numerous considerations discussed only briefly in this paper. In many cases, the optimal solution may include both track forms. Rolling stock considerations and their influence on track infrastructure design are considered beyond the scope of this paper. This paper will focus predominantly on two slab track systems widely used in international HSR projects: the Japanese J-slab track system; and the German Rheda slab track system. The French track system will be referenced as the typical ballasted track HSR design. The practices discussed in this paper generally apply to systems which are either primarily or exclusively passenger rail systems. In the U.S., these types of systems will necessarily exclude the systems the Federal Railway Administration (FRA) refers to as “Emerging” or “Regional” HSR systems which include passenger train traffic to share trackage on, what are otherwise considered, primarily freight lines.

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Jung, Myoungsoo, i Mahmut Kandemir. "Middleware - firmware cooperation for high-speed solid state drives". W the Posters and Demo Track. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2405153.2405158.

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Popov, Dmitry V., i Roman B. Ryabichenko. "High-speed imaging and processing for rail track inspection". W 26th International Congress on High-Speed Photography and Photonics, redaktorzy Dennis L. Paisley, Stuart Kleinfelder, Donald R. Snyder i Brian J. Thompson. SPIE, 2005. http://dx.doi.org/10.1117/12.567325.

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Nelapatla, Bala Tarun, Rahul Singhal, Michael Daub i Zoran Stanojevics. "Innovative Practices Track: High Speed Test Fabric". W 2022 IEEE 40th VLSI Test Symposium (VTS). IEEE, 2022. http://dx.doi.org/10.1109/vts52500.2021.9794166.

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Bergeron, Daniel. "Holloman High Speed Test Track Maglev Program UpdateThe Holloman High Speed Test Track Magnetically Levitated (MAGLEV) Sled Six Degree-of-Freedom ModelHolloman High Speed Test Track Maglev Program Update". W U.S. Air Force T&E Days 2010. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-1707.

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Weinstein, Leonard M., i David Minto. "Focusing schlieren photography at the Holloman High Speed Test Track". W 22nd Int'l Congress on High-Speed Photography and Photonics, redaktorzy Dennis L. Paisley i ALan M. Frank. SPIE, 1997. http://dx.doi.org/10.1117/12.273387.

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Du, Yanqing, Mingzhou Bai, Yun Chen i Diqing Yi. "Vertical Displacement Distributions of Double-Track High-Speed Railways' Ballastless Track Infrastructure". W Geo-Hubei 2014 International Conference on Sustainable Civil Infrastructure. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784478448.016.

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Reid, John D., Ronald K. Faller i Dean L. Sicking. "High Speed Crash Barrier Investigation Using Simulation". W ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2473.

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Abstract Auto racing has become one of the most popular sporting venues in the United States. For these events, vehicles typically travel around oval tracks at extremely high speeds, in some cases in excess of 365 km/h. At these higher speeds, these vehicles may be involved in multi-car collisions or impacts with the exterior rigid walls, potentially resulting in serious driver injuries or fatalities. Although infrequent, serious harm has also occurred to spectators as flying vehicle debris has passed over protective fencing. As a result of these accidents, researchers at the Midwest Roadside Safety Facility, in cooperation with the Indy Racing League, Indianapolis Motor Speedway, and Kestrel Advisors, Inc., have been investigating and developing several energy-absorbing barrier concepts that would provide increased track safety. Two concepts — one using HDPE plates and one using crushable foam — are described herein. Preliminary results from the computer simulation effort show great potential for increasing the safety of race track barriers.

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Raporty organizacyjne na temat "HIGH SPEED TRACK"

Brown, Michael, Robert Dvorak, Tom Lee i Joseph Marra. Joint High-Speed Sea Truck. Fort Belvoir, VA: Defense Technical Information Center, maj 2006. http://dx.doi.org/10.21236/ada487083.

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Noone, Emily, i Lydia Harriss. Hypersonic missiles. Parliamentary Office of Science and Technology, czerwiec 2023. http://dx.doi.org/10.58248/pn696.

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This POSTnote looks at hypersonic missile technologies, efforts to develop them, potential applications, and the possible challenges they may present for missile defence and global stability. Key Points: • Hypersonic missiles combine speeds of over five times the speed of sound with significant manoeuvrability during flight. • Their manoeuvrability enables them to change trajectory during flight, making their flight-path and target difficult to predict. • They fly at lower altitudes than ballistic missiles, which means that they may be harder to track at long distances with some surface-based sensors, such as certain radar. • There are two main types of hypersonic missile: hypersonic glide vehicles (HGVs) and hypersonic cruise missiles (HCMs). • HGVs are mounted onto rocket boosters for launch and may be accelerated to speeds of Mach 20 or more. The glider then separates from the booster and flies unpowered in the Earth’s upper atmosphere at altitudes of 30-80 km, before diving towards the target. • HCMs typically have a ramjet or scramjet engine that enables them to reach hypersonic speeds at altitudes of 20-40 km. • China and Russia have reportedly deployed hypersonic missiles that could deliver conventional or nuclear weapons. The US is testing multiple hypersonic technologies. • The AUKUS agreement between the UK, US and Australia includes developing hyper-sonic and counter-hypersonic technologies. • Developing hypersonic missiles requires significant research and development challenges to be overcome, contributing to their high development and manufacturing costs. • The speed, manoeuvrability and altitude of hypersonic missiles may challenge existing missile defences, although their uses and effectiveness are still being assessed. • Defence analysts disagree about the potential implications of hypersonic missiles for global peace and stability. Some suggest they could increase the risk of conflict escalation, while others say that they will not alter the strategic balance between nuclear powers. • Arms control, export controls and other measures may help limit potential harm to peace and stability, but these approaches face challenges.

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Jamison, Keith. Autonomous, Power and Cost Efficient, High Speed,Tracs Gas Measurement System. Office of Scientific and Technical Information (OSTI), maj 2023. http://dx.doi.org/10.2172/1975670.

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Duvvuri, Sarvani, i Srinivas S. Pulugurtha. Researching Relationships between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics. Mineta Transportation Institute, lipiec 2021. http://dx.doi.org/10.31979/mti.2021.1946.

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Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion mitigation, but a very few studies focused on data exclusive to trucks. This research is aimed at a regional-level analysis of truck travel time data to identify roads for improving mobility and reducing congestion for truck traffic. The objectives of the research are to compute and evaluate the truck travel time performance measures (by time of the day and day of the week) and use selected truck travel time performance measures to examine their correlation with on-network and off-network characteristics. Truck travel time data for the year 2019 were obtained and processed at the link level for Mecklenburg County, Wake County, and Buncombe County, NC. Various truck travel time performance measures were computed by time of the day and day of the week. Pearson correlation coefficient analysis was performed to select the average travel time (ATT), planning time index (PTI), travel time index (TTI), and buffer time index (BTI) for further analysis. On-network characteristics such as the speed limit, reference speed, annual average daily traffic (AADT), and the number of through lanes were extracted for each link. Similarly, off-network characteristics such as land use and demographic data in the near vicinity of each selected link were captured using 0.25 miles and 0.50 miles as buffer widths. The relationships between the selected truck travel time performance measures and on-network and off-network characteristics were then analyzed using Pearson correlation coefficient analysis. The results indicate that urban areas, high-volume roads, and principal arterial roads are positively correlated with the truck travel time performance measures. Further, the presence of agricultural, light commercial, heavy commercial, light industrial, single-family residential, multi-family residential, office, transportation, and medical land uses increase the truck travel time performance measures (decrease the operational performance). The methodological approach and findings can be used in identifying potential areas to serve as truck priority zones and for planning decentralized delivery locations.

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Bahman Habibzadeh. Very High Fuel Economy, Heavy Duty, Constant Speed, Truck Engine Optimized Via Unique Energy Recovery Turbines and Facilitated High Efficiency Continuously Variable Drivetrain. Office of Scientific and Technical Information (OSTI), styczeń 2010. http://dx.doi.org/10.2172/992845.

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Al-Qadi, Imad, Egemen Okte, Aravind Ramakrishnan, Qingwen Zhou i Watheq Sayeh. Truck-Platoonable Pavement Sections in Illinois’ Network. Illinois Center for Transportation, luty 2021. http://dx.doi.org/10.36501/0197-9191/21-002.

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Truck platooning has many benefits over traditional truck mobility. Literature shows that platooning improves safety and reduces fuel consumption between 5% and 15% based on platoon configuration. In Illinois, trucks carry more than 50% of freight tonnage and constitute 25% of the traffic on interstates. Deployment of truck platooning within interstate highways would result in significant fuel savings, but may have a direct impact on flexible pavement performance. The channelization of the platoon and reduced rest time between consecutive loads would accelerate the damage accumulation at the channelized position. Ultimately, this would lead to pavement service life reduction and a subsequent increase in maintenance and rehabilitation costs. Therefore, the main objective of this project is to quantify the effects of platooning on flexible pavements and provide guidelines for the state of Illinois by considering the aforementioned factors. Although the benefits of platooning are quantifiable, not every truck route is platoonable. For efficient platooning, trucks need to travel at a constant high speed for extended distances. The integrity of the platoon should be preserved because interfering vehicles would compromise the platooning benefits and road safety. An introduced high-level approach considers the volume/capacity of a roadway and the expected number of highway exit and entry conflicts. Using these parameters, each roadway section is assigned a level of platoonability, ranging from one to five—with five being the highest. A framework was developed to analyze the Illinois highway network. It was found that 89% of the network highway is platoonable under average capacity conditions.

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Pulugurtha, Srinivas S., Sarvani Duvvuri i Sonu Mathew. Risk Factors Associated with Crash Injury Severity Involving Trucks. Mineta Transportation Institute, czerwiec 2022. http://dx.doi.org/10.31979/mti.2022.2117.

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Nearly 499,000 motor vehicle crashes involving trucks were reported across the United States in 2018, out of which 22% resulted in fatalities and injuries. Given the growing economy and demand for trucking in the future, it is crucial to identify the risk factors to understand where, when, and why the likelihood of getting involved in a severe or moderate injury crash with a truck is higher. This research, therefore, focuses on capturing and exploring risk factors associated with surrounding land use and demographic characteristics in addition to crash, driver, and on-network characteristics by modeling injury severity of crashes involving trucks. Crash data for Mecklenburg County in North Carolina from 2013 to 2017 was used to develop partial proportionality odds model and identify risk factors influencing injury severity of crashes involving trucks. The findings from this research indicate that dark lighting condition, inclement weather condition, the presence of double yellow or no-passing zone, road sections with speed limit >40 mph and curves, and driver fatigue, impairment, and inattention have a significant influence on injury severity of crashes involving trucks. These outcomes indicate the need for effective geometric design and improved visibility to reduce the injury severity of crashes involving trucks. The likelihood of getting involved in a crash with a truck is also high in areas with high employment, government, light commercial, and light industrial land uses. The findings can be used to proactively plan and prioritize the allocation of resources to improve safety of transportation system users in these areas.

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