A General Method of Braking Process Simulation for Flexible Marshalling EMUs

A General Method of Braking Process Simulation for Flexible Marshalling EMUs

Tianhe Ma | Mengling Wu | Chun Tian

Institute of Rail Transit, Tongji University, China

Page: 
353-361
|
DOI: 
https://doi.org/10.2495/TDI-V2-N4-353-361
Received: 
N/A
|
Revised: 
N/A
|
Accepted: 
N/A
|
Available online: 
15 November 2018
| Citation

OPEN ACCESS

Abstract: 

Electropneumatic brake systems are widely used on electric multiple units (EMUs) for high-speed railway and urban rail transit. The common marshalling of the EMUs varies from four to eight cars for urban mass transit and even 16 cars for high-speed way. Traditional methods for braking calculation, which are only suitable for unit-fixed and marshalling-fixed EMUs, are not able to deal with complicated braking process and various marshalling. In this article, a general method for flexible marshalling train braking process simulation is proposed. This method deals with an EMU consisting of 1–24 cars by dividing it into one to eight units and each unit has one to three cars. During braking of EMUs, braking force is calculated according to brake level and velocity, and then managed and applied according to units’ type and distributing principle. With this method, braking deceleration, speed, distance and electric braking force, pneumatic braking force and brake cylinder pressure of each car at any time during the whole braking process can be all presented. Simulation covers braking instruction transmission, braking force calculation and management at train level, electric pneumatic blending braking force distribution at unit level and braking force application at vehicle level. Simulation has been validated by field test results. Finally, an instance of simulation for a custom marshalling EMU is presented. The method can not only meet the needs of engineers and technicians to do brake calculation and braking performance validation of the existing fixed marshalling EMUs, but also provide reference for new design of novel flexible marshalling EMUs.

Keywords: 

braking process, electric pneumatic blending brake, EMUs, flexible marshalling

  References

[1] Luo, Z., Wu, M., Zuo, J. & Tian C., Modelling and model validation of an electropneumatic brake on subway trains. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 230(2), pp. 374–391, 2014. DOI: 10.1243/09596518JSCE188.

[2] Pugi, L., Malvezzi, M., Allotta, B., Banchi L. & Presciani P., A parametric library for the simulation of a Union Internationale des Chemins de fer (UIC) pneumatic braking system. Proceedings of the Institution of Mechanical Engineers Part F: Journal of Rail & Rapid Transit, 218(2), pp. 117–132, 2014. DOI: 10.1243/0954409041319632.

[3] Piechowiak, T., Pneumatic train brake simulation method. Vehicle System Dynamics, 47(12), pp.1473–1492, 2009. DOI: 10.1299/jsmec.44.594.

[4] Richer, E. & Hurmuzlu, Y., A high performance pneumatic force actuator system: Part I – nonlinear mathematical model. Journal of Dynamic Systems Measurement & Control Transactions of the Asme, 122(3), pp. 416–425, 2000. DOI: 10.1016/0196-8904(94)90082-5.

[5] Li Z., Yang H., Liu M. & Liu J., Modeling and tracking control for braking process of high speed electric multiple unit. China Railway Science, 37(5), pp.80–86, 2016. DOI: 10.3969/j.issn.1001-4632.2016.05.11.

[6] Guo H. & Xie K., Hammerstein model and parameters identification of EMU braking system. Journal of the China Railway Society, 36(4), pp.48–53, 2014. DOI: 10.3969/j. issn.1001-8360.2014.04.009.

[7] Yu, Z. & Chen D., Modeling and system identification of the braking system of urban rail vehicles. Journal of the China Railway Society, 33(10), pp.37–40, 2011. DOI: 10.3969/j.issn.1001-8360.2011.10.007.

[8] Yang, H., Yan, J. & Zhang, K., Braking process modeling and simulation of CRH2 electric multiple unit. Third International Conference on Digital Manufacturing and Automation, pp. 264–267, 2012. DOI: 10.1109/ICDMA.2012.64.

[9] Zhu W., Wu M., Tian C. & Zuo J., Integrated simulation platform of braking system of rolling stock based on multi-discipline collaborative analysis. Journal of Traffic & Transportation Engineering, 17(3), pp. 99–110, 2017. DOI: 10.3969/j.issn.1671-1637.2017.03.011.

[10] Zuo, J., Wang, Z. & Wu, M., Simulation model of air braking system for subway train. Journal of Traffic & Transportation Engineering, 13(2), pp. 42–47, 2013. DOI: 10.3969/j.issn.1671-1637.2013.02.006.

[11] Zhu, W. & Wu, M., Braking calculation of electric multiple units (EMUs). Journal of Tongji University, 45(1), pp. 119–123 and 134, 2017. DOI: 10.11908/j.issn.0253-374x.2017.01.017.