Citation

Wei W, Du NB. J. Traffic Transp. Eng. (Xi'an, Shaanxi) 2011; 11(5): 49-54.

Copyright

(Copyright © 2011, Chang'an Daxue)

DOI

unavailable

PMID

unavailable

Abstract

With fluid dynamics theory, the models of braking pipe and distributing valve for heavy haul train were built, the equations of braking pipe and boundary point were solved, the braking system performances in braking process were simulated, and the influence of the lengths of main pipe and branch pipe on the braking performances was analyzed. Analysis result shows that under common braking, when the length of main pipe increases from 13.24 m to 17.24 m, the decompression time of braking pipe increases by 30.75%, and the boost time of braking cylinder increases by 20.45%. The influence of main pipe on common braking is even stronger than that of main pipe on emergency braking. Under common braking, when the length of branch pipe increases from 0.50 m to 5.00 m, the decompression time of braking pipe increases by 6.63%, and the boost time of braking cylinder increases by 5.22%. The influence of branch pipe on common braking is almost same for that of branch pipe on emergency braking. The increase length of braking pipe reduces the decompression speed of braking pipe and the boost speed of braking cylinder. The influence of the length of main pipe is stronger than that of branch pipe, and the influence becomes obviously with the increase of the distance between car and locomotive.