Evaluation Method of Lateral Force Sharing for Each Part when Centrifugal Force is Loaded on Railway Vehicle

2020 ◽  
Vol 2020.29 (0) ◽  
pp. 1013
Author(s):  
Takatoshi HONDO ◽  
Takayuki TANAKA
Keyword(s):  
Centrifugal Force ◽  
Evaluation Method ◽  
Lateral Force ◽  
Railway Vehicle ◽  
Force Sharing

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.

Assessment of Thermal Damage for Railway Wheel of Long-Term Running

2011 ◽  
Vol 488-489 ◽  
pp. 194-197
Author(s):  
Seok Jin Kwon ◽  
Jung Won Seo ◽  
Dong Hyung Lee ◽  
Sung Tae Kwon
Keyword(s):  
Residual Stress ◽  
Evaluation Method ◽  
Ride Comfort ◽  
Maintenance Cost ◽  
Railway Vehicle ◽  
X Ray Diffraction ◽  
Railway Wheel ◽  
Brake Application ◽  
Railway Wheels

The railway wheel in long-term running had experienced the wheel damage due to fatigue crack and shelling. The damaged wheel in railway vehicle would cause a poor ride comfort, a rise in the maintenance cost and even fracture of the wheel, which then leads to a tremendous social and economical cost. It is necessary to evaluate long-term damage of railway wheel in order to ensure the safety of wheel. To evaluate the damage for railway wheels, the measurements for the replication of wheel surface and residual stress of railway wheel using x-ray diffraction system were carried out. The result shows that the residual stress of wheel is depend on the running distance and thermal gradient during brake application also that the replication test can be applied in new evaluation method of wheel damage.

Damage Evaluation of Wheel Tread based on Contact Position between Wheel and Rail

2009 ◽  
Vol 417-418 ◽  
pp. 645-648 ◽  
Author(s):  
Seok Jin Kwon ◽  
Dong Hyung Lee ◽  
Jung Won Seo ◽  
Young Sam Ham
Keyword(s):  
Crack Propagation ◽  
Evaluation Method ◽  
Railway Vehicle ◽  
Damage Evaluation ◽  
Wheel Surface ◽  
Contact Position ◽  
Railway Wheels

The defect initiation and crack propagation in wheel may result in the damage of the railway vehicle or derailment. Therefore, it is important to evaluate the characteristics of the wheel tread. In the present paper, the characteristics of wheel tread based on contact positions, running distance and brake pattern are evaluated. To evaluate the damage for railway wheels, the measurement for the replication of wheel surface is carried out. The result shows that the damaged wheel tread is remarkably depended on the contact positions between wheel and rail. It should be noted that the replication test can be applied in new evaluation method of wheel damage.

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.

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