Magnetic Guidance of Conventional Railroad Vehicles

1982 ◽  
Vol 104 (3) ◽  
pp. 238-246 ◽  
Author(s):  
R. J. Caudill ◽  
L. M. Sweet ◽  
K. Oda
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Ride Quality ◽  
Normal Forces ◽  
Rail Vehicles ◽  
Magnetic Guidance ◽  
Curving Performance ◽  
Near Term ◽  
Conventional Rail ◽  
Derailment Safety

The potential for improved dynamic performance of conventional rail vehicles through control of linear induction or synchronous motors is explored. Improvements in vehicle stability, ride quality, traction capability, track loading, derailment safety, and curving performance result from use of controllable lateral and normal forces present in the motor. Recent advances in technology originally developed for high-speed levitated vehicles are applied to conventional railroad systems which have a greater potential for near-term implementation. The dynamic performance of alternate configurations, consisting of several generic motor types mounted either on trucks or carbodies, are evaluated. Significant improvements in both lateral dynamic stability and curving performance may be realized through magnetic guidance of the trucks using force levels well within the capability of existing linear motor technology.

scholarly journals Benefits of mechatronically guided vehicles on railway track switches

2018 ◽  
Vol 234 (3) ◽  
pp. 276-288 ◽  
Author(s):  
Nabilah Farhat ◽  
Christopher P Ward ◽  
Roger Dixon ◽  
Roger M Goodall
Keyword(s):  
High Speed ◽  
Simulation Software ◽  
Railway Track ◽  
Ride Quality ◽  
Switching Function ◽  
Vehicle Model ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Conventional Rail ◽  
Multi Body

Conventional rail vehicles struggle to optimally satisfy the different suspension requirements for various track profiles, such as on a straight track with stochastic irregularities, curved track or switches and crossings, whereas mechatronically guided railway vehicles promise a large advantage over conventional vehicles in terms of reduced wheel–rail wear, improved guidance and opening new possibilities in vehicle architecture. Previous research in this area has looked into guidance and steering using multi-body simulation models of mechatronic rail vehicles of three different mechanical configurations – secondary yaw control, actuated solid-axle wheelset and driven independently rotating wheelsets (DIRW). The DIRW vehicle showed the best performance in terms of reduced wear and minimal flange contact and is therefore chosen in this paper for studying the behaviour of mechatronically guided rail vehicles on conventional switches and crossings. In the work presented here, a mechatronic vehicle with the DIRW configuration is run on moderate and high-speed track switches. The longer term motivation is to perform the switching function from on-board the vehicle as opposed to from the track as is done conventionally. As a first step towards this, the mechatronic vehicle model is compared against a conventional rail vehicle model on two track scenarios – a moderate speed C type switch and a high-speed H switch. A multi-body simulation software is used to produce a high fidelity model of an active rail vehicle with independently rotating wheelsets where each wheel has an integrated ‘wheelmotor’. This work demonstrates the theory that mechatronic rail vehicles could be used on conventional switches and crossings. The results show that the mechatronic vehicle gives a significant reduction in wear, reduced flange contact and improved ride quality on the through routes of both moderate and high-speed switches. On the diverging routes, the controller can be tuned to achieve minimal flange contact and improved ride quality at the expense of higher creep forces and wear.

A Horizontal Vibration Wave Model for High Speed Elevators

2005 ◽  
Vol 297-300 ◽  
pp. 1585-1591 ◽  
Author(s):  
X.Y. Gang ◽  
Zhe He Yao ◽  
Zi Chen Chen
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Wave Model ◽  
Wave Theory ◽  
Ride Quality ◽  
Mass System ◽  
Horizontal Vibration ◽  
One Dimensional ◽  
Vibration Wave ◽  
Methods Numerical

Horizontal vibration has critical influence upon elevators’ ride quality. Based on the wave theory of one-dimensional string vibration, a horizontal vibration wave model is built to simulate the dynamic performance of a high speed elevator system. Through coordinate transformation, Galerkin’s method is used to discretize the governing partial differential equations into a dumped-mass system, which can be solved effectively with classic methods. Numerical results show that the horizontal vibration behaviors are closely interconnected with the location, velocity and acceleration of elevator cab.

Simulation Analysis of Influences of Anti-Roll Torsion Bar on Vehicle Dynamics

2013 ◽  
Vol 409-410 ◽  
pp. 1486-1491
Author(s):  
Zhuo Yu He
Keyword(s):  
Vehicle Dynamics ◽  
High Speed ◽  
Simulation Analysis ◽  
Dynamic Performance ◽  
Rail Vehicles ◽  
Urban Rail ◽  
Passenger Trains ◽  
Secondary Suspension ◽  
Dynamics Models ◽  
Torsion Bar

In the secondary suspension of urban rail vehicles and high-speed passenger trains, combination of air springs and anti-roll torsion bar is widely used. However, in its practical use, cracks appear in the anti-roll torsion bar and vehicle curve performance is lower. Through analysis of anti-roll torsion bar, acceleration being taken into account, the dynamics models of anti-roll torsion bar and the vehicle itself are established. The results indicate that the combination of anti-roll torsion bar and rubber joints is superior to present a more reasonable anti-roll stiffness, to ensure better dynamic performance of the train, and also to lengthen the life of the anti-roll torsion bar.

Theoretical study on the effect of the anti-yaw damper for rail vehicles

2019 ◽  
Vol 234 (2) ◽  
pp. 457-473
Author(s):  
Zhanghui Xia ◽  
Jinsong Zhou ◽  
Dao Gong ◽  
Wenjing Sun ◽  
Yu Sun
Keyword(s):  
Complex Model ◽  
Ride Quality ◽  
Analysis Model ◽  
Rail Vehicles ◽  
Trade Offs ◽  
Integrative View ◽  
Analytical Formulas ◽  
Curving Performance ◽  
The Stability ◽  
The Impact

Simplification of a complex model is an analytical method commonly adopted in engineering design and academic research. A simplified theoretical analysis model can help project planners or researchers to develop an integrative view of the effect of each component on the system performances, which allows them to understand the related engineering phenomena and make proper engineering judgments. Based on the widely used Maxwell constitutive model for anti-yaw dampers, a simple 4 degree-of-freedom model is established to derive a set of analytical formulas, including those for critical speed, anti-yaw damper force transfer function, and rational resistance factor, which control the stability, ride quality, and curving performance of rail vehicles, respectively. Based on the proposed analytical formulas, the impact of damper parameters and mounting positions of the anti-yaw damper on the stability, ride quality and curving performance are analyzed. Finally, trade-offs among stability, ride quality, and curving performance are also discussed.

scholarly journals High Speed Curving Performance of Rail Vehicles

2015 ◽  
Author(s):  
Brian Marquis ◽  
Robert Greif
Keyword(s):  
Steady State ◽  
High Speed ◽  
Field Testing ◽  
Contact Forces ◽  
Track Geometry ◽  
Safety Standards ◽  
Rail Vehicles ◽  
Wide Range ◽  
Final Rule ◽  
Curving Performance

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.

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.

Computer-Aided Wheel Profile Design for Railway Vehicles

1989 ◽  
Vol 111 (3) ◽  
pp. 288-291 ◽  
Author(s):  
Imtiaz-ul-Haque ◽  
D. A. Latimer ◽  
E. H. Law
Keyword(s):  
Nonlinear Programming ◽  
Dynamic Performance ◽  
Optimization Methods ◽  
Theoretical Studies ◽  
Interaction Forces ◽  
Rail Vehicles ◽  
Computer Aided ◽  
Wheel Profile ◽  
Profile Design ◽  
Conventional Rail

Wheel-rail geometry parameters strongly affect the dynamic performance of rail vehicles through their influence on the interaction forces between the wheel and rail. This paper presents an approach that uses nonlinear programming and optimization methods to systematically design wheel profiles that satisfy dynamic performance and wear constraints for conventional rail vehicles. Theoretical studies conducted to this point indicate this approach to be feasible.

Dynamic Performance of High-Speed Electric Multiple Unit within Multi-Body System Simulation

2019 ◽  
Vol 12 (4) ◽  
pp. 339-349
Author(s):  
Junguo Wang ◽  
Daoping Gong ◽  
Rui Sun ◽  
Yongxiang Zhao
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Dynamic Performance ◽  
Body System ◽  
High Speed Railway ◽  
Evaluation Indexes ◽  
Actual Operation ◽  
Multiple Unit ◽  
The Stability ◽  
Multi Body

Background: With the rapid development of the high-speed railway, the dynamic performance such as running stability and safety of the high-speed train is increasingly important. This paper focuses on the dynamic performance of high-speed Electric Multiple Unit (EMU), especially the dynamic characteristics of the bogie frame and car body. Various patents have been discussed in this article. Objective: To develop the Multi-Body System (MBS) model of EMU, verify whether the dynamic performance meets the actual operation requirements, and provide some useful information for dynamics and structural design of the proposed EMU. Methods: According to the technical characteristics of a typical EMU, a MBS model is established via SIMPACK, and the measured data of China high-speed railway is taken as the excitation of track random irregularity. To test the dynamic performance of the EMU, including the stability and safety, some evaluation indexes such as wheel-axle lateral forces, wheel-axle lateral vertical forces, derailment coefficients and wheel unloading rates are also calculated and analyzed in detail. Results: The MBS model of EMU has better dynamic performance especially curving performance, and some evaluation indexes of the stability and safety have also reached China’s high-speed railway standards. Conclusion: The effectiveness of the proposed MBS model is verified, and the dynamic performance of the MBS model can meet the design requirements of high-speed EMU.

Dynamic Performance of HTS Maglev and Comparisons with Another Two Types of High-Speed Railway Vehicles

Cryogenics ◽  
2021 ◽  
pp. 103321
Author(s):  
Yuhang Yuan ◽  
Jipeng Li ◽  
Zigang Deng ◽  
Zhehao Liu ◽  
Dingding Wu ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
High Speed Railway ◽  
Railway Vehicles ◽  
Hts Maglev
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