Development of a Novel Degraded Adhesion Model for Railway Systems

2016 ◽  
Author(s):  
L. Marini ◽  
E. Meli ◽  
S. Panconi ◽  
A. Ridolfi ◽  
A. Rindi
Keyword(s):  
Railway Systems ◽  
Adhesion Model ◽  
Degraded Adhesion

A local degraded adhesion model for creep forces evaluation: An approximate approach to the tangential contact problem

Wear ◽  
2019 ◽  
Vol 440-441 ◽  
pp. 203084 ◽  
Author(s):  
Martina Meacci ◽  
Zhiyong Shi ◽  
Elisa Butini ◽  
Lorenzo Marini ◽  
Enrico Meli ◽  
...  
Keyword(s):  
Contact Problem ◽  
Tangential Contact ◽  
Approximate Approach ◽  
Adhesion Model ◽  
Degraded Adhesion

An improved degraded adhesion model for wheel–rail under braking conditions

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wenliang Zhu ◽  
Wenjian Zhu ◽  
Shubin Zheng ◽  
Na Wu
Keyword(s):  
Peer Review ◽  
Design Methodology ◽  
Content Type ◽  
Emergency Braking ◽  
Rail Vehicles ◽  
Time Simulation ◽  
Adhesion Model ◽  
Braking Force ◽  
Degraded Adhesion ◽  
Adhesion Condition

Purpose The purpose of this paper is to develop an improved adhesion model to better reproduce the low adhesion condition of the anti-skid control for rail vehicles under braking condition. Design/methodology/approach In view of the low adhesion characteristics for rail vehicles under braking conditions, the Polach adhesion model was improved based on the sliding power and sliding energy. The wheel–rail low adhesion model suitable for braking condition was given. The analysis of braking anti-skid control under emergency braking condition was carried out through the co-simulation, and compared with the test data; the effectiveness and practicability of the improved low adhesion model were verified. Findings The results showed that the improved adhesion model is simple and efficient and the parameters involved are less, and it can be directly applied to the real-time simulation of anti-skid control in the process of train braking. Originality/value This paper can provide a theoretical reference for the reasons of change and improvement of adhesion between wheel and rail caused by the adjustment of braking force under anti-skid control, which can fulfill a need to the study of sliding energy on the contact surface, the removal effect of pollutants on the wheel–rail surface and the improvement and recovery of adhesion caused. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0244/

scholarly journals A railway local degraded adhesion model including variable friction, energy dissipation and adhesion recovery

2020 ◽  
pp. 1-22
Author(s):  
Martina Meacci ◽  
Zhiyong Shi ◽  
Elisa Butini ◽  
Lorenzo Marini ◽  
Enrico Meli ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Variable Friction ◽  
Friction Energy ◽  
Adhesion Model ◽  
Degraded Adhesion ◽  
Adhesion Recovery

An innovative degraded adhesion model for multibody applications in the railway field

2013 ◽  
Vol 32 (2) ◽  
pp. 133-157 ◽  
Author(s):  
E. Meli ◽  
L. Pugi ◽  
A. Ridolfi
Keyword(s):  
Adhesion Model ◽  
Degraded Adhesion

Case study: Prediction and field tests of railway noise and effects of a low-height noise barrier

2020 ◽  
Vol 68 (4) ◽  
pp. 303-314
Author(s):  
Yuna Park ◽  
Hyo-In Koh ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
University of Science and Technology, Transpo ◽  
...  
Keyword(s):  
High Speed ◽  
Field Tests ◽  
Residential Areas ◽  
Railway Systems ◽  
Railway Noise ◽  
Sound Levels ◽  
Noise Barrier ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact

Railway noise is calculated to predict the impact of new or reconstructed railway tracks on nearby residential areas. The results are used to prepare adequate counter- measures, and the calculation results are directly related to the cost of the action plans. The calculated values were used to produce noise maps for each area of inter- est. The Schall 03 2012 is one of the most frequently used methods for the production of noise maps. The latest version was released in 2012 and uses various input para- meters associated with the latest rail vehicles and track systems in Germany. This version has not been sufficiently used in South Korea, and there is a lack of standard guidelines and a precise manual for Korean railway systems. Thus, it is not clear what input parameters will match specific local cases. This study investigates the modeling procedure for Korean railway systems and the differences between calcu- lated railway sound levels and measured values obtained using the Schall 03 2012 model. Depending on the location of sound receivers, the difference between the cal- culated and measured values was within approximately 4 dB for various train types. In the case of high-speed trains, the value was approximately 7 dB. A noise-reducing measure was also modeled. The noise reduction effect of a low-height noise barrier system was predicted and evaluated for operating railway sites within the frame- work of a national research project in Korea. The comparison of calculated and measured values showed differences within 2.5 dB.

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