Design Considerations in the Development of a North American High Speed Turnout

2010 ◽  
Author(s):  
Brian C. Abbott ◽  
Tom Lee ◽  
Gary Click ◽  
Steve Mattson ◽  
Ken W. Ouelette
Keyword(s):  
North American ◽  
High Speed ◽  
Support Systems ◽  
Ride Quality ◽  
Lateral Loads ◽  
High Speed Rail ◽  
Design Elements ◽  
Entire Vehicle ◽  
Axle Loads ◽  
New Generation

North American turnout and special trackwork design has evolved in an operating environment in which axle loads have increased significantly but operating speeds have remained modest. Consequently, while trackwork components have become much more robust, turnout geometries and overall system design has remained essentially static for many decades. Implementation of high speed rail (“HSR”) in North America will necessitate a radically different approach to turnout engineering. While there is much to be learned from European and Asian experience with high speed, it is anticipated that vehicle designs and mixed freight access will result in much greater axle loads. The combination of operating speed and loading will present unique challenges. Critical design elements for North America’s new generation of HSR turnouts will include: a) Compound geometries to optimize ride quality and safety while keeping overall lengths within manageable limits. b) Fastening and horizontal support systems to withstand high dynamic lateral loads. c) Dampening systems to attenuate high frequency vibration. d) Detailing such as rail seat canting and kinematic gauge optimization to enhance ride quality and increase component life. e) High modulus vertical support systems. f) Drive and locking systems specifically tailored to long HSR layouts. Regulations governing the layout and maintenance tolerances of North American turnouts will also have to be re-examined with the advent of high speed rail. Complex geometries and rapid transient loading will render the conventional approach of limiting speeds based on calculated imbalance ineffective. Accurate and rational assessment of operating safety will demand the application of dynamic numeric modeling to the entire vehicle / turnout system.

scholarly journals Impact of fractional order methods on optimized tilt control for rail vehicles

2017 ◽  
Vol 20 (3) ◽  
Author(s):  
Fazilah Hassan ◽  
Argyrios Zolotas
Keyword(s):  
Fractional Order ◽  
High Speed ◽  
Control Design ◽  
Ride Quality ◽  
Dynamic Interactions ◽  
High Speed Rail ◽  
Control Applications ◽  
Railway Systems ◽  
Methods Analytical ◽  
The Impact

AbstractAdvances in the use of fractional order calculus in control theory increasingly make their way into control applications such as in the process industry, electrical machines, mechatronics/robotics, albeit at a slower rate into control applications in automotive and railway systems. We present work on advances in high-speed rail vehicle tilt control design enabled by use of fractional order methods. Analytical problems in rail tilt control still exist especially on simplified tilt using non-precedent sensor information (rather than use of the more complex precedence (or preview) schemes). Challenges arise due to suspension dynamic interactions (due to strong coupling between roll and lateral dynamic modes) and the sensor measurement. We explore optimized PID-based non-precedent tilt control via both direct fractional-order PID design and via fractional-order based loop shaping that reduces effect of lags in the design model. The impact of fractional order design methods on tilt performance (track curve following vs ride quality) trade off is particularly emphasized. Simulation results illustrate superior benefit by utilizing fractional order-based tilt control design.

Effective Friction Control for Optimization of High Speed Rail Operations

2010 ◽  
Author(s):  
Donald T. Eadie ◽  
Kevin Oldknow ◽  
Yasushi Oka ◽  
Ron Hui ◽  
Peter Klauser ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Reliability ◽  
Ride Quality ◽  
Oil And Grease ◽  
High Speed Rail ◽  
Wear Rates ◽  
Friction Control ◽  
Very High ◽  
Effective Friction

Expected growth of High Speed Rail (HSR) in North America will in many instances involve operation on existing infrastructure, shared with other traffic. This will pose many challenges, not least of which will be wheel and rail wear, and ride quality. This paper addresses how effective friction control can be employed to mitigate these factors and provide an important tool to the designers of new systems. Case studies describe successful use of train mounted solid stick LCF flange lubrication on high speed trains in East Asia and Japan. In each case, higher speed train operation has involved operation on areas of track with greater curvature than usual on dedicated high speed track. Appropriately designed LCF systems provide an inherently very high level of reliability and very low flange wear rates. Use of dry thin film lubricant technology has advantages over use of liquid lubricants (oil and grease) which can experience splash and fling off at high train speeds. Train mounted solid sticks provide greater consistency / reliability and ease of maintenance compared with wayside gauge face lubrication. Complementing practical field experience, modeling studies are presented which show the potential of high performance flange lubrication to allow for additional flexibility in designing wheel profiles for high speed rail. The ideal profile will balance vehicle stability (benefiting from lower conicity) and curving performance (benefiting from higher conicity). In a high speed train with long wheel base and high suspension stiffness operating in areas with significant curvature, finding an appropriate compromise becomes even more challenging than usual. Controlling flange wear at low rates with highly effective solid stick lubrication offers the opportunity to use wheel profiles providing lower effective conicity and therefore better ride quality, without compromising wheel life. This approach will be practical only in a scenario where a very high reliability wheel / rail lubrication system is employed.

scholarly journals Decision Support Systems for Real-World High-Speed Rail Planning

2016 ◽  
Vol 142 (5) ◽  
pp. 04016015 ◽  
Author(s):  
Ana Laura Costa ◽  
Maria da Conceição Cunha ◽  
Paulo A. L. F. Coelho ◽  
Herbert H. Einstein
Keyword(s):  
Decision Support ◽  
Decision Support Systems ◽  
Real World ◽  
High Speed ◽  
Support Systems ◽  
High Speed Rail

Design and Development of Smart Semi Active Suspension for Nonlinear Rail Vehicle Vibration Reduction

2020 ◽  
Vol 20 (11) ◽  
pp. 2050120
Author(s):  
Sunil Kumar Sharma ◽  
Jaesun Lee
Keyword(s):  
Predictive Model ◽  
High Speed ◽  
Mr Damper ◽  
Active Suspension ◽  
Creep Model ◽  
Ride Quality ◽  
High Speed Rail ◽  
Running Safety ◽  
Rail Vehicle ◽  
Fluid Dampers

In this paper, the semi-active suspension in railway vehicles based on the controlled magnetorheological (MR) fluid dampers is examined, and compared with the semi-active low and semi-active high suspension systems to enhance the running safety and ride quality for a high-speed rail vehicle. Predictive model controllers are used as system controllers to determine the desired damping forces for front and rear bogie frame with force track-ability. A 28 degree of freedom (DoF) mathematical model of the rail vehicle is formulated using nonlinear vehicle suspension and nonlinear heuristic creep model. The MR model of Ali and Ramaswamy is formulated to characterize the behavior of the MR damper. The simulation result is validated using the experimental results. Four different suspension strategies are proposed with MR damper, i.e. passive, semi-active low, semi-active high and semi-active smart controller based on predictive model controller. A comparison indicates that the semi-active controller gives the optimum for comfort vibration actuation and improves the ride quality and it has little influence on derailment quotients, offload factors, as a result, it will not endanger the running safety of rail vehicle.

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.

Re-Engineering Heavy Haul Turnouts for Passenger Higher Speed Rail Operations

2011 ◽  
Author(s):  
Blaine O. Peterson
Keyword(s):  
Public Transportation ◽  
Ride Quality ◽  
Design Elements ◽  
Detection Systems ◽  
Passenger Rail ◽  
Position Detection ◽  
Transit Times ◽  
Heavy Haul ◽  
New Generation ◽  
Transportation Agencies

With the recent renewed interest in higher speed passenger rail (“HrSR”) in North America, there will be increased pressure on freight railroads to collaborate with public transportation agencies in the establishment of “shared use” tracks. Track infrastructure in these corridors must be robust enough to support the heavy axle loading associated with conventional North American freight traffic while accommodating FRA Class 6-7 passenger operating speeds in excess of 100 mph. Turnouts which permit higher diverging route speeds will become increasingly important as service-sensitive passenger operations look to reduce transit times and freights grapple with capacity concerns. Innovative approaches to the design, manufacture and construction of turnouts are called for. Critical design elements for a new generation of “shared use” turnouts will include: a) Tangential and compound geometries to optimize ride quality and safety; b) Respecting the spatial constraints of existing infrastructure (opposing signal locations) while maximizing diverging route permissible speeds; c) Kinematic gauge optimization through switches to enhance ride quality and increase component life; d) Premium frog designs to minimize running surface discontinuities; e) Cross tie housed rodding and position detection systems to facilitate continuous maintenance surfacing; f) Integrated switch drive, detection and monitoring systems to facilitate proactive intervention by maintenance forces.

Applying the European High-Speed Rail Experience to North America

2010 ◽  
Author(s):  
David S. Lehlbach ◽  
David T. Hunt ◽  
Kevin M. Foy ◽  
Rodney E. Case
Keyword(s):  
North America ◽  
North American ◽  
High Speed ◽  
High Speed Rail ◽  
Passenger Rail ◽  
Partnership Model ◽  
The North ◽  
European Experience ◽  
Mixed Use ◽  
Partnership Approach

Driven by a range of factors, there is growing interest in highspeed passenger rail (HSR) and intercity passenger rail (IPR) in North America. A valuable source of information on the cooperation needed to make these services viable in North America is European experience with HSR/IPR, which extends over many decades. North American owners and operators can learn much from Europe with regard to operating dense, mixed-use corridors: Using a “partnership” model, European rail operators have found that when incremental demand for freight and passenger markets are considered together, networks can be expanded faster and further. In North America, a similar partnership approach to capital and strategic planning has already shown huge benefits, for example, in the development of the highly regarded Capital Corridor passenger service in California and in infrastructure improvements on Canadian National’s Kingston subdivision that allow VIA Rail to provide 100–125 mph train service. Through an analysis of current passenger/freight cooperation in Europe, and the examination of HSR/IPR developments and trends in North America, we aim in this paper to illustrate how benefits can be achieved for all stakeholders in the North American rail system as passenger services expand.

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.

scholarly journals Examination of Vehicle Performance at High Speed and High Cant Deficiency

2011 ◽  
Author(s):  
Brian Marquis ◽  
Jon LeBlanc ◽  
Ali Tajaddini
Keyword(s):  
High Speed ◽  
Lateral Force ◽  
Ride Quality ◽  
High Speed Rail ◽  
Vehicle Performance ◽  
Track Geometry ◽  
Track Maintenance ◽  
Performance Requirements ◽  
Rail Vehicles ◽  
The Us

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.

Research on Prediction of High-Speed Rail Trains Delay Time

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Jing Shi ◽  
Qiyuan Peng ◽  
Ling Liu
Keyword(s):  
Delay Time ◽  
High Speed ◽  
High Speed Rail
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