scholarly journals Development of micro-ribbed wheel tread profile of railway vehicle for reducing steady lateral force on curve

2014 ◽  
Vol 80 (812) ◽  
pp. TRANS0061-TRANS0061
Author(s):  
Daisuke YAMAMOTO
Keyword(s):  
Lateral Force ◽  
Railway Vehicle

scholarly journals Railway Actuator Made of Magnetic Elastomers and Driven by a Magnetic Field

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1351 ◽  
Author(s):  
Yasuhiro Umehara ◽  
Yusuke Yamanaga ◽  
Shota Akama ◽  
Shunsuke Kato ◽  
Shogo Kamoshita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Elastic Modulus ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Fine Particles ◽  
Lateral Force ◽  
Railway Vehicle ◽  
Compression Tests ◽  
Field Stress ◽  
Magnetic Elastomers

We fabricated a mono-link using bimodal magnetic elastomers that demonstrate drastic changes in the elastic modulus by magnetic fields. The magnetic elastomer is bimodal consisting of large magnetic particles and nonmagnetic fine particles. The storage modulus for bimodal magnetic elastomers was altered from 2.2 × 105 to 1.7 × 106 Pa by a magnetic field of 500 mT. Compression tests up to a strain of 20% also revealed that the on-field stress for the bimodal magnetic elastomer was 1.24 times higher than the off-field stress. The bimodal magnetic elastomer was synthesized for the mono-link and was mounted on the bogie of a railway vehicle. A running test exhibited that the wheel lateral force was reduced by 20% by applying a magnetic field of 390 mT.

Analysis of Experimental Data in the Context of Safety against Derailment of a Railway Vehicle, Using the Energy Method

2012 ◽  
Vol 518 ◽  
pp. 16-23 ◽  
Author(s):  
Michał Opala
Keyword(s):  
Experimental Data ◽  
Monitoring System ◽  
Condition Monitoring ◽  
Energy Method ◽  
Lateral Force ◽  
Contact Forces ◽  
Railway Vehicle ◽  
Interaction Forces ◽  
Condition Monitoring System

This article describes an example analysis of safety against derailment of a railway vehicle. The analysis is based on the experimental data recorded during measurement of the wheel-rail interaction forces and lateral accelerations. The data is used for the calculation of two safety against derailment indicators and then the indicators are compared to each other. The first indicator is the ratio of the lateral to vertical wheel-rail forces Y/Q, based on the Nadal criteria. The second indicator is given in the energy description. In this description, the derailment of a railway vehicle depends on the amount of the work that has been done by the total lateral force acting on the single wheelset. The second indicator can be particularly convenient for a railway vehicle condition monitoring system, because it does not require the measurement of the contact forces.

Prediction of the Probability of Rail Vehicle Derailment During Grade Crossing Collisions

1982 ◽  
Vol 104 (2) ◽  
pp. 119-132 ◽  
Author(s):  
D. B. Cherchas ◽  
G. W. English ◽  
N. Ritchie ◽  
E. R. McIlveen ◽  
C. Schwier
Keyword(s):  
Computer Simulation ◽  
Preliminary Investigation ◽  
Lateral Force ◽  
Railway Vehicle ◽  
Vehicle Speed ◽  
Wheel Load ◽  
Road Vehicle ◽  
Rail Vehicle ◽  
Derailment Coefficient ◽  
Grade Crossing

A mathematical model and digital computer simulation are developed to analyze the dynamics of railway and road vehicles during grade crossing collisions. The main objective of the simulation is to relate the probability of derailment to railway vehicle speed; however, a variety of other response characteristics such as railway and road vehicle structure deformation and road vehicle dynamic response can be examined. The criterion for derailment is based on the derailment coefficient, i.e., ratio of wheel flange/railhead lateral force to vertical wheel load. More specifically, the computer simulation utilizes a relationship between the probability of wheel climb commencing and the derailment coefficient, established by Japan National Railways based on their experimental test program. A preliminary investigation is made of the sensitivity of the derailment probability to various collision situations, with the emphasis on increasing rail vehicle speed. Conclusions and recommendations based on this analysis are presented.

A Study on the Evaluation Methods of Running Safety for Railway Vehicle

2006 ◽  
Vol 321-323 ◽  
pp. 1499-1502 ◽  
Author(s):  
Young Sam Ham ◽  
Jai Sung Hong ◽  
Taek Yul Oh
Keyword(s):  
Lateral Force ◽  
Interaction Force ◽  
Load Test ◽  
Railway Vehicle ◽  
Static Load Test ◽  
Track Maintenance ◽  
Running Safety ◽  
Derailment Coefficient ◽  
Main Track ◽  
Measurement And Evaluation

The important factor to evaluate the running safety of a railway vehicle would be the interaction force between wheel and rail(derailment coefficient), for which is one of important factors to check the running safety of a railway vehicle that may cause a tragic accident. Especially, a newly developed vehicle that first runs commercially requires necessarily the measurement and evaluation of derailment coefficient for securing the safety of a vehicle while measuring the derailment coefficient in view of securing running safety could be the more important factor than any other factors. In the meanwhile, it should be also measured the interaction force between wheel and rail in view of track maintenance as well as running safety because increased weight of a vehicle while it is running over a railway may cause damages or destruction on track components such as rails, sleepers and etc consisted of track and any rapid distortion of track. For the reason, the study was intended to evaluate the curving performance and the running safety from the analyses of dynamic running properties, manufacturing wheel axes to measure the working operation of wheels/rail, static load test, derailment coefficient calculated by running test on main track, ratio of wheel unloading, lateral force tolerance of the vehicle that is newly manufactured and commercially running on Gwangju Urban Railway and describe the results.

scholarly journals Dynamic Forces between the Rails and the Wheels of Railway Vehicle

2016 ◽  
Vol 28 (1) ◽  
pp. 63-69
Author(s):  
Zdravko Peran
Keyword(s):  
Lateral Force ◽  
Cumulative Distribution ◽  
Driving Safety ◽  
Railway Vehicle ◽  
Computer Tool ◽  
Quantitative Studies ◽  
Dynamic Forces ◽  
Train Tracks ◽  
Two Phases ◽  
Dynamic Phenomena

The process of acquisition of the measured dynamic values of forces between the rails and the wheels on the real measurement train and the train tracks. The conversion of the measured values into the matrices and vectors enables numerous exact qualitative and quantitative studies of the dynamic phenomena behaviour. The paper shows the possibilities of using MATLAB computer tool. All the commands in the software are given and explained. Calculating of the empirical, normal and cumulative distribution on an example of the lateral force is given in detail. The new software is exactly verified mathematically and qualified for any further use. The developed software is the tool for the development of other two phases: software for the exact automatic evaluation of the maximum values of the dynamic values and software for the automatic approval of vehicles and railway due to the driving safety, loading tracks and driving comfort compared to the limited values regarding UI C CODE 518.

scholarly journals Analysis on Steering Performance of Active Steering Bogie According to Steering Angle Control in Curve Section

2020 ◽  
Author(s):  
Hyunmoo Hur ◽  
Yujeong Shin ◽  
Dahoon Ahn
Keyword(s):  
Position Control ◽  
Control Method ◽  
Lateral Force ◽  
Future Research ◽  
Railway Vehicle ◽  
Radius Of Curvature ◽  
Steering Angle ◽  
Active Steering ◽  
Derailment Coefficient ◽  
Curved Section

The steering performance according to the steering angle control was tested by using the active steering bogie developed to reduce excessive wheels and rail wear and noise generated when the railway vehicle run in a curved section. As a result of the test of increasing the steering angle in accordance with the target steering angle in the 300m radius of curvature, the bogie is gradually aligned in the radial steering position, and when the control is carried out to 100% of the target steering angle, the bogie angles of the front and rear bogies appeared almost the same. As the steering angle increased, wheel lateral force and derailment coefficient also decreased. Therefore, the validity of the radial steering position control method applied in this paper was confirmed experimentally. This test results will be used for future research on active steering bogie commercialization.

Sign in / Sign up

Export Citation Format

Share Document