Simulation of traction and curving for passive steering hauling locomotives

2008 ◽  
Vol 222 (2) ◽  
pp. 117-127 ◽  
Author(s):  
S A Simson ◽  
C Cole
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
General Motors ◽  
Light Rail ◽  
High Speed Rail ◽  
Commuter Rail ◽  
Heavy Haul Train ◽  
Heavy Haul ◽  
Curving Performance ◽  
Better Than

In a heavy haul train operations the ruling grades that set the tractive power requirements for train consists are often associated with tight curvatures. Past studies of passive or active bogie steering developments have been mostly directed towards high-speed rail applications or light rail and commuter rail applications and hence studies have focused on two axle bogies. Linked passive steering three axle locomotive bogies such as produced by General Motors Electric Motor Division for the SD70 class locomotive are in widespread use however, there are few publications on traction and curving, and few papers on linked passive steering bogies. This paper presents a simulation study three axle bogie locomotives on various curve radii with traction and variable rail friction conditions. Curving performance is assessed showing body linked radial bogies to have considerable advantages over axle linked bogies that are significantly better than yaw relaxation bogies at improving steering under traction. As traction adhesion approaches the rail friction coefficient steering performance of all bogies without forced steering deteriorates to the same levels as a rigid bogie.

scholarly journals Visions of a polycentric suburb : the evolution of car-centric design

2021 ◽  
Author(s):  
Mark Siemicki
Keyword(s):  
Urban Sprawl ◽  
High Speed ◽  
Light Rail ◽  
High Speed Rail ◽  
Southern Ontario ◽  
Commuter Rail ◽  
Suburban Cities ◽  
Emerging Issues ◽  
Rail Rapid Transit ◽  
Globalized World

The following thesis investigates emerging issues surrounding car-centric design know as urban sprawl and questions whether or not it is feasible and appropriate for cities to continue sprawling in a car-centric manner given changing conditions. Social, political, environmental and economical concerns have surfaced putting a damper on the once great "American Dream" raising concerns that car-centric design can prove detrimental to humanity. The roots of modernist design are discussed and the ideas behind modernists' intentions analyzed while juxtaposing modernist vision to the real outcomes of modernism. Modernist ideas are compared and contrasted to new and old theories that challenge the modernist ideals in order to propose a new direction for future urban development. The design project takes into account the importance of connection and network through infrastructure in a globalized world. Transit infrastructure (high speed rail, improved commuter rail, rapid transit and light rail) is proposed on a number of scales in the Southern Ontario region to act as a catalyst for responsible growth interconnecting future intensified polycentric suburban cities.

A closer look at rail methodology in the BTS National Transportation Noise Map

2021 ◽  
Vol 263 (1) ◽  
pp. 5372-5381
Author(s):  
Amanda Rapoza ◽  
Meghan Shumway ◽  
Gary Baker ◽  
Peter Wilke
Keyword(s):  
High Speed ◽  
Light Rail ◽  
Urban Centers ◽  
High Speed Rail ◽  
Transportation Noise ◽  
Passenger Rail ◽  
Commuter Rail ◽  
Noise Data ◽  
Time Changes ◽  
Noise Map

In 2017, the Bureau of Transportation Statistics released the inaugural national, multi-modal transportation noise map prototype. The noise modeling and mapping effort was envisioned as a way to facilitate the geographic tracking of national trends and provide insight into transportation noise-related questions as changes occur over time - changes between modes, types of vehicles within modes and the geographic shifts of populations. How do changes in aircraft technology change the transportation noise landscape? Does increased high speed rail availability affect highway-related noise? How does a population shift away from urban centers affect the soundscape? The inaugural model included aviation and highway sources. The first update, released in November 2020, includes passenger rail-related noise in addition to aviation and highway sources. Operations in this new mode include commuter rail mainline, high-speed electric, light rail, heavy rail and streetcars, along with commuter rail horns at highway-rail grade crossings. The data for this noise map were modeled based on USDOT methods, with adjustments and simplifications to model on a national scale. This paper focuses on the modeling methods and geospatial approach used to develop the passenger rail noise data layer.

scholarly journals Visions of a polycentric suburb : the evolution of car-centric design

2021 ◽  
Author(s):  
Mark Siemicki
Keyword(s):  
Urban Sprawl ◽  
High Speed ◽  
Light Rail ◽  
High Speed Rail ◽  
Southern Ontario ◽  
Commuter Rail ◽  
Suburban Cities ◽  
Emerging Issues ◽  
Rail Rapid Transit ◽  
Globalized World

The following thesis investigates emerging issues surrounding car-centric design know as urban sprawl and questions whether or not it is feasible and appropriate for cities to continue sprawling in a car-centric manner given changing conditions. Social, political, environmental and economical concerns have surfaced putting a damper on the once great "American Dream" raising concerns that car-centric design can prove detrimental to humanity. The roots of modernist design are discussed and the ideas behind modernists' intentions analyzed while juxtaposing modernist vision to the real outcomes of modernism. Modernist ideas are compared and contrasted to new and old theories that challenge the modernist ideals in order to propose a new direction for future urban development. The design project takes into account the importance of connection and network through infrastructure in a globalized world. Transit infrastructure (high speed rail, improved commuter rail, rapid transit and light rail) is proposed on a number of scales in the Southern Ontario region to act as a catalyst for responsible growth interconnecting future intensified polycentric suburban cities.

Laboratory and Field Investigation of the Rail Pad Assembly Mechanistic Behavior

2014 ◽  
Author(s):  
Thiago B. do Carmo ◽  
J. Riley Edwards ◽  
Ryan G. Kernes ◽  
Bassem O. Andrawes ◽  
Chris P. L. Barkan
Keyword(s):  
High Speed ◽  
Failure Modes ◽  
Lateral Displacement ◽  
Relative Displacement ◽  
Field Investigation ◽  
High Speed Rail ◽  
Component Design ◽  
Scientific Principles ◽  
Heavy Haul ◽  
And Performance

To achieve the performance demands due to growing heavy-haul freight operations and increased high-speed rail service worldwide, advancements in concrete crosstie fastening systems are required. A mechanistic design approach based on scientific principles and derived from extensive laboratory and field investigation has the potential to improve the current best practices in fastening system design. The understanding of failure modes and effects on each component, associated with an improved understanding of load distribution and mechanical behavior, will ultimately increase production and operational efficiency while reducing unscheduled maintenance, track outages, and unplanned additional costs. Improvements on the rail pad assemblies, the components responsible for attenuating loads and protecting the concrete crosstie rail seat, will enhance the safety and efficiency of the track infrastructure. Understanding the mechanistic behavior of rail pad assemblies is critical to improving the performance and life cycle of the infrastructure and its components, which will ultimately reduce the occurrence of potential failure modes. Lateral, longitudinal, and shear forces exerted on the components of the fastening system may result in displacements and deformations of the rail pad with respect to the rail seat and rail base. The high stresses and relative movements are expected to contribute to multiple failure mechanisms and result in an increased need for costly maintenance activities. Therefore, the analysis of the mechanics of pad assemblies is important for the improvement of railroad superstructure component design and performance. In this study, the lateral displacement of this component with respect to the rail base and rail seat is analyzed. The research ultimately aims to investigate the hypothesis that relative displacement between the rail pad and rail seat occurs under realistic loading environments and that the magnitude of the displacement is directly related to the increase in wheel loads.

Land Use and Transit Integration and Transit Use Incentives

1998 ◽  
Vol 1618 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Snehamay Khasnabis
Keyword(s):  
Land Use ◽  
High Speed ◽  
Private Investment ◽  
Light Rail ◽  
Urban Structure ◽  
Sources Of Information ◽  
Cooperative Research ◽  
High Speed Rail ◽  
Transportation Policies ◽  
Urban Activities

Planners have often looked on transportation policies as a means of controlling broad patterns of land use. It has been argued that past transportation policies have contributed to decentralization of urban activities resulting in congestion, traffic hazards, and environmental pollution. Others contend that urban land uses reflect location decisions by individual households and employers and that transportation is just one of the many factors that affect such decisions. Thus, public policies in transportation have very little opportunity to alter future land use. The exact effect of transit on the distribution of urban activities, the resulting urban structure, the level of congestion, and air quality is not fully understood. An attempt is made in this paper to document successful cases of transit and land use integration as well as the techniques used by different agencies to bring about such integration. Various studies under the Transit Cooperative Research Program on different aspects of transit and land use policies serve as the basic sources of information for this paper. Eight case studies are examined that encompass a variety of transit modes in urban North America. It is concluded that the accessibility advantages provided by transit may play a crucial role in the concentration of development and in creating economic opportunities. However, transit by itself is not sufficient to guarantee successful transit-focused development. Other major factors are supportive regional and local policies and private investment in concert with the transit program. Further, successful transit and land use integration does not necessarily imply the presence of a high-speed rail system. In a strong market, when support policies are in place, light rail and busways can also be used to channel urban growth.

scholarly journals Identification of Precast Parapet Work Activities in Elevated Railway Construction

2021 ◽  
Vol 2 (02) ◽  
pp. 52-61
Author(s):  
Pungky Dharma Saputra
Keyword(s):  
High Speed ◽  
Descriptive Analysis ◽  
Light Rail ◽  
Infrastructure Development ◽  
High Speed Rail ◽  
Work Activities ◽  
Railway Construction ◽  
Railway Infrastructure ◽  
Concrete Casting ◽  
Double Track

Railway infrastructure development is very massive in Indonesia. Many projects have been constructing since 2013, such as the Mass Rapid Transit (MRT), Light Rail Transit (LRT), Double-Double Track (DDT), and High-Speed Rail (HSR). And all of these projects were design with elevated structures. When applying precast parapet panel technology in the MRT project elevated section, the contractor didn’t have a reference for precast parapet work activities. Hence, it required new planning for its construction and took time. The project sample of this research was MRT Jakarta CP 103 Project. There were three stages in this research starting from documentation analysis, expert judgment, and respondent survey. There were 5 bridge construction experts and 30 respondents which were professional engineers asked for their recommendations and opinions. Descriptive analysis was applied to know the percentage of opinions. This research focuses on identifying precast parapet activities in elevated railway construction project. There are 14 activities that had been identified in this research, namely preparation, position survey, adjustment material installation, precast parapet panel shifting from trailer to the top of deck slab, precast parapet panel distribution, precast parapet panel installation, rebar parapet installation for concrete stitch, sealing work, concrete casting, formwork dismantling, and finishing. These activities will be very useful for similar precast parapet works in a future project.

COMPUTER SIMULATION OF STEADY STATE CURVING PERFORMANCE OF HIGH SPEED ARTICULATED TRAIN SETS

1996 ◽  
Vol 20 (4) ◽  
pp. 365-389 ◽  
Author(s):  
A.K.W. Ahmed ◽  
C. Liu ◽  
I. Haque
Keyword(s):  
Steady State ◽  
Parametric Study ◽  
High Speed ◽  
Railway Vehicle ◽  
Lateral Stability ◽  
High Speed Rail ◽  
Trade Off ◽  
Stability Performance ◽  
Minimum Number ◽  
Curving Performance

This study focuses on the steady state curving performance of articulated High Speed Rail (HSR) train sets. The models incorporate the essential features of an articulated train system such as shared trucks, and suspension characteristics such as car-to-car and car-to-truck connections. As one of the first studies on the curving performance of articulated HSR train sets, linearized steady state curving models for ten-car, five-car, and three-car consists have been developed. Steady state curving performance of the three models has been evaluated and compared to determine the minimum number of cars required in a consist for effective simulation of curving performance. The models are further used for parametric study to examine the influence of selected parameters on the steady state curving performance. The results are compared with those of a parallel study on lateral stability performance in view of stability-curving trade-off. The results show that a baseline articulated train set corresponding to lateral stability critical speed of 310 km/h is capable of negotiating a standard curved track with 0.43 degree curvature, maximum 4 degree unbalance and 12.5 mm flange clearance without wheel flanging or slip. The parametric study showed that the trade off between stability and curving is less extensive than it is known for a conventional railway vehicle. It is found that there is no conflict for wheel conicity less than 0.035 where both curving and stability performance improves with increase in wheel conicity.

Top of Rail Friction Control as a Means to Mitigate Damaging Lateral Loads Due to Overbalanced Operation of Heavy Axle Load Freight Traffic in Shared High Speed Rail Corridors

2010 ◽  
Author(s):  
Kevin D. Oldknow ◽  
Donald T. Eadie
Keyword(s):  
High Speed ◽  
Management Strategies ◽  
Traffic Data ◽  
Lateral Loads ◽  
High Speed Rail ◽  
Friction Control ◽  
Lateral Forces ◽  
Freight Traffic ◽  
High Speed Trains ◽  
Heavy Haul

The use of Top of Rail friction management (TORFM) to reduce lateral forces has been well established in both freight and passenger systems. In this paper the authors discuss how TORFM provides an important tool to track designers who need to balance the super-elevation requirements for both high speed trains and slower freight traffic. Data from full scale heavy haul revenue service case studies are presented and discussed with a particular emphasis on the mitigating role that can be played by appropriate TOR friction management strategies in shared High Speed Rail corridors.

Improved Performance Track Components for Heavy Axle Loads and High Speed Rail

2010 ◽  
Author(s):  
David D. Davis ◽  
Joseph LoPresti ◽  
Semih Kalay
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Cost Effective ◽  
High Speed Rail ◽  
Traffic Demand ◽  
Passenger Traffic ◽  
Traffic Growth ◽  
Heavy Haul ◽  
Axle Loads ◽  
Improved Performance

North American railways have experienced significant traffic growth over the past 20 years to the point where many lines are at or near capacity. While the current worldwide recession has eased capacity constraints momentarily, the long-term trends are for continued traffic growth. Faced with the prospects of perhaps doubling freight traffic demand in the next 20 years and adding significant passenger traffic, the railroads are developing cost effective ways to increase capacity. Besides constructing additional tracks, improving the performance (i.e., safety, reliability, and service lives) of key track components is expected. Both heavy axle loads (HAL) and high speed rail (HSR) passenger traffic require high quality, durable track. The paper will describe recent work done to improve the dynamic performance and durability of these track components: • Special trackwork. • Rail joints. • Crossties. • Track transitions. For example, turnouts are being developed that can accommodate freight shippers served from mainline track that also carry high speed traffic. These continuous mainline rail switches and frogs allow slow speed diverging operations that will not affect mainline track performance. The paper will also discuss further heavy haul infrastructure research and development needs.

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