Freight train air brake modelling with emergency valves

IF 2.1 4区 工程技术
Fan Jiang, Kai Li, Honghua Wu, Shihui Luo
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引用次数: 0

Abstract

The 120-type air brake system is unique around global rail industry and critical for Chinese freight train operation. Existing research about its simulations does not include detailed models for the emergency brake valves. This paper filled this research gap by developing a detailed fluid dynamic air brake system with a focus on the emergency brake valve. The working principle of the emergency brake vale was reviewed. The brake system model was based on gas flow governing equations (mass and momentum) and orifice flow equations. The model was validated by comparing with measured data from a 150-wagon train. Four braking scenarios were compared. The simulated maximum cylinder pressure was only 5 kPa out of the range of the measured data. The maximum difference regarding the time when cylinder pressure reaches maximum pressure was 4 s. The simulation results have also shown variable switch pressure points for the two-stage brake valve. This is agreed by the measured results and was not shown in previously published research.
带紧急阀门的货运列车空气制动模型
120 型空气制动系统在全球铁路行业中独一无二,对中国货运列车运行至关重要。现有的模拟研究并不包括紧急制动阀的详细模型。本文以紧急制动阀为重点,建立了详细的流体动力学空气制动系统,填补了这一研究空白。本文回顾了紧急制动阀的工作原理。制动系统模型基于气体流动控制方程(质量和动量)和孔流方程。通过与一列 150 节车厢列车的测量数据进行比较,对模型进行了验证。对四种制动情况进行了比较。模拟的最大气缸压力仅为 5 千帕,超出了测量数据的范围。模拟结果还显示,两级制动阀的开关压力点是可变的。这与测量结果一致,也是以前发表的研究中没有显示的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advances in Mechanical Engineering
Advances in Mechanical Engineering Engineering-Mechanical Engineering
自引率
4.80%
发文量
353
期刊介绍: Advances in Mechanical Engineering (AIME) is a JCR Ranked, peer-reviewed, open access journal which publishes a wide range of original research and review articles. The journal Editorial Board welcomes manuscripts in both fundamental and applied research areas, and encourages submissions which contribute novel and innovative insights to the field of mechanical engineering
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