Analysis of Lateral Track Strength for High Speed Rail

2005 ◽  
Author(s):  
Steven M. Chrismer
Keyword(s):  
High Speed ◽  
Maximum Speed ◽  
Strength Model ◽  
Vehicle Dynamic ◽  
High Speed Rail ◽  
Independent Analysis ◽  
Load Limit ◽  
Rail Industry ◽  
Passenger Trains ◽  
Made In

Recently the FRA has proposed a reduction in the maximum allowable net axle lateral load limit from the current 50 percent of static vertical axle load (NAL/V limit = 50%) to less than 40 percent depending, in part, on the basis of FRA’s lateral track strength model, TREDA. Such a reduction could indirectly result in limiting the maximum speed of high speed passenger trains to the equivalent of 7 inches (178 mm) cant deficiency. This paper reports on the author’s investigation of selected assumptions and calculations made in TREDA. Improvements to the model are recommended and a revised NAL/V relationship is proposed, derived from an independent analysis of the driving and resisting forces. Finally, a vehicle dynamic analysis is performed to determine how the author’s proposed revised NAL/V limit would affect 9-inch (229 mm) cant deficiency operation as the high speed rail industry is now considering.

Critical Logistics Support Enables Fast Track Construction for High Speed Rail

2010 ◽  
Author(s):  
James R. Blaze ◽  
Jay Gowan ◽  
Stephen Byers
Keyword(s):  
Construction Management ◽  
Construction Projects ◽  
High Speed ◽  
Fast Track ◽  
State Of The Art ◽  
Economic Advantage ◽  
High Speed Rail ◽  
Operational Costs ◽  
Construction Zones ◽  
Made In

Paper and PowerPoint presentation format will describe process for much faster logistics and construction management of new high speed track construction and improvement of existing FRA track from FRA Class 4 to Class 5 and Class 6 standards on existing freight railway lines. This process involves an integration of the long materials supply chain together with rapid process state of the art construction machines. These machines have been used in both European and Chinese high speed construction projects. Huge gains in new track kilometers and miles per day have been made in the last decade on the machinery side of the equation. The authors will show several case studies. The critical key to these production rates has been in the integration of materials ordering and prepositioning. The economic advantage is that track time construction windows that delay other passing trains can be reduced at tremendous savings in service and operational costs to the operators already providing service in these new high speed corridors and construction zones. Examples and calculations are shown.

scholarly journals Empirical Analysis of Relieving High-Speed Rail Freight Congestion in China

2020 ◽  
Vol 12 (23) ◽  
pp. 9918
Author(s):  
Hanlin Gao ◽  
Meiqing Zhang ◽  
Anne Goodchild
Keyword(s):  
Time Series ◽  
Empirical Analysis ◽  
High Speed ◽  
High Speed Rail ◽  
Rail Freight ◽  
Predictive Regression ◽  
Freight Volume ◽  
Passenger Trains ◽  
Integrated Time Series ◽  
Small Capacity

This paper discusses how to promote high-speed rail (HSR) freight business by solving the congestion problem. First, we define the existing operation modes in China and propose the idea of relieving congestion by reserving more carriages of HSR passenger trains for freight between cities with large potential volume or small capacity. Second, we take one HSR corridor as a case to study, and use predictive regression and integrated time series methods to forecast the growth of HSR freight volume along the corridor. Finally, combined with forecast results and available capacity during the peak month of 2018, we offer suggestions on the mode adoption in each segment during the peak month from 2019 to 2022. Results demonstrate: (1) Among all 84 Origin-Destination (OD) city flows, the percentage of those monthly volumes over 1 ton increases from 17.9% in 2018 to 84.6% in 2022, and those over 30 tons rise from 3.6% to 26.2%. (2) Among the segments between seven main cities in the HSR corridor, T-J should be given priority to operate trains with reserved mode; the segment between X and J deserves to reserve most carriages during the peak month in the future. Specifically, our model suggests reserving 5.3–10.1 carriages/day for J-X, and 4.8–16.3 carriages/day for X-J during the peak month from 2019 to 2022.

scholarly journals RESEARCH DIRECTIONS THE DEVELOPMENT OF SPEED AND HIGH-SPEED PASSENGER TRAINS ON RAILWAYS UKRAINE

2014 ◽  
Author(s):  
Larisa Parkhomenko
Keyword(s):  
High Speed ◽  
Railway Network ◽  
High Speed Rail ◽  
Passenger Traffic ◽  
Passenger Transportation ◽  
Partial Interaction ◽  
Normal Speed ◽  
Speed Up ◽  
Passenger Trains ◽  
Railway Passenger

This paper analyzes the trends of high-speed and high-speed passenger trains on the railways of Ukraine on the basis of market research and analysis of passenger traffic plying the effectiveness of conventional and high-speed passenger trains within the existing operating model railroad network. The analysis of changes in the competitiveness of rail transport in the passenger transportation market in the implementation of high-speed and high-speed rail passenger traffic. This paper analyzes the effectiveness of most profitable running of passenger trains normal speed (speed up to 120 km/h ) and passenger trains new Hyundai and Skoda (speed up to 160 km/h), which began to run from 2012 on the railway network inUkraine. We prove the efficiency of high-speed railway passenger transportation to Ukraine on the basis of an extensive network of specialized upgraded lines on which trains are capable of speeds up to 180 km/hwith the possibility of partial interaction with conventional network.

scholarly journals Fatigue Behavior of Rail Connections on Semi –High Speed and High Speed Rail Networks

2020 ◽  
Vol 9 (4) ◽  
pp. 722-737
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Fatigue Behavior ◽  
Wheel Load ◽  
High Speed Rail ◽  
Continuous Welded Rail ◽  
Normal Speed ◽  
Simulation Results ◽  
Made In ◽  
Ansys Workbench

Rail joint is the most vulnerable and weakest part in the rail structure. Bolted rail joints and welded rail joints are the most predominantly used rail joints. In recent times, continuous welded rail joints are widely used. The literature study exhibits that the performance of welded rail joints are comparatively better than the bolted rail joints. This project mainly deals with the fatigue behavior of welded rail joints subjected to normal speed, semi-high speed and high speed rail networks with respect to rail joint location on the sleeper. The rail joint kept on two conditions, mainly rail joint on top of the sleeper and rail joint in between the sleepers. The model was created and the respective finite element analyses were made in ANSYS Workbench software. The rail joint was analyzed for the movement of wheel load on the rail for all speed conditions mentioned. The butt joint was given at the region of rail joint and the fatigue life results were obtained in the analyses made in ANSYS Workbench. The analyses methods covers the rail and wheel model creation, application of corresponding loads and supports and the simulation results were obtained. The simulation results portrays that when the continuous welded rail joint is located on the sleeper, the fatigue life of the rail joint in both the normal speed and semi-high speed conditions is higher when compared to the fatigue life of rail joint in high speed condition. And also when the welded rail joints are located in between two sleepers the rail joint in high speed rail networks provide increased fatigue life when compared with the rail joints located in normal and semi high speed conditions. This research provides a beneficiary effect and serves as a base for increasing the fatigue life of the rail networks.

Stability of a Flexible Wheelset for High Speed Rail Vehicles With Constant and Varying Parameters

1998 ◽  
Vol 120 (4) ◽  
pp. 997-1002 ◽  
Author(s):  
J. Lieh ◽  
J. Yin
Keyword(s):  
High Speed ◽  
State Transition ◽  
Time Varying ◽  
Vehicle Dynamic ◽  
High Speed Rail ◽  
Rail Vehicles ◽  
Flexible Wheelset ◽  
The Stability ◽  
Time Varying Models ◽  
Stability Concept

The stability of an elastic wheelset coupled with torsional spring and damper is studied in this paper. With flexible elements between two wheels, the advantages of both rigid and independently rotating wheel systems may be obtained. Previous investigations indicated that axle flexibility will affect the vehicle dynamic behavior and an optimal design may improve the system performance. Those studies were limited to constant wheel/rail geometry as the wheelset rolls along the track. In this paper, it is intended to determine the critical speed regions for both constant and time-varying models. The variation in conicity is assumed to be periodic thus the Floquet stability concept may be employed. The computation of the state-transition matrix is based on a Runge-Kutta algorithm.

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