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http://dx.doi.org/10.5762/KAIS.2020.21.1.61

Comparisons of Empirical Braking Models for Freight Trains Using P4a Distribution Valve  

Choi, Don Bum (Korea Railroad Research Institute)
Kim, Min-Soo (Korea Railroad Research Institute)
Lee, Kangmi (Korea Railroad Research Institute)
Kim, Young-Guk (Korea Railroad Research Institute)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.1, 2020 , pp. 61-69 More about this Journal
Abstract
This study examined the braking characteristics of a heavy haul freight train with P4a distribution valves applied to domestic high-speed freight trains. A freight train was composed of 50 cars, which is twice the normal operation. A braking test was performed to confirm the characteristics of the braking of a heavy haul. The brake cylinder pressures were measured for emergency and service braking on the 1st, 10th, 20th, 30th, and 50th cars. Because the brake signal is transmitted to the pressure through the braking tube connected to the end of the train, the rear vehicle is braking later than the vehicle ahead. Therefore, it is necessary to predict the brake pressures in all cars in a train to supplement the results of the limited tests and calculate the braking distance. The pressure in each car was determined using empirical models of linear interpolation, stepwise, and exponential models, which provided reliable information. The predictive results of the empirical models were compared with the measured results, and the exponential model was predicted relatively accurately. These results are expected to contribute to the safe operation of heavy haul freight trains and can be used to predict the braking distance and calculate the level of impact between vehicles during braking.
Keywords
Brake Pressure; Heavy Haul; Freight Train; P4a Distribution Valve;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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