Influence of rail temperature on braking efficiency in railway vehicles

The data presented were obtained experimentally using a 1:20 scale physical model of a vehicle and a railway track, installed in the Dynamics and Vibrations Laboratory of the Autonomous University of Querétaro (Mexico).

Data Collection Methodology:

 Rail Thermal Conditioning: Straight segments of steel rail (5 mm diameter) were heated in a controlled manner using Nichrome wire glued to their outer sides. A direct current (DC) source supplied different voltages to reach the target temperatures:

• 28.5°C: Room temperature (control).

• 40.0°C: Approximately 1.6 A.

• 49.9°C: Approximately 2.4 A.

• 71.0°C: Approximately 4.0 A.

The temperature was verified and recorded with a Fluke T1105 infrared camera.

Directly measured dynamic parameters: Vehicle and wheel speed: These were measured using a rotary encoder (DC5-24V model, 600 pulses per revolution) coupled to the drive wheel and an optical sensor.

Three operating speeds:

• 0.75 m/s.

• 1.00 m/s.

• 1.30 m/s.

Dataset structure:

The resulting dataset comprises 12 experimental cases, resulting from combining the four rail temperatures with the three test speeds (0.75, 1.00, and 1.30 m/s). For each case, the dataset includes the measured and calculated values of: speed, COF, braking time, braking distance, maximum slip, and peak current.

本实验数据通过墨西哥克雷塔罗自治大学动力学与振动实验室中搭建的1:20比例车辆与轨道物理模型实测获取。

数据收集方法：

轨道热调控：将直径5mm的钢轨直段外侧粘贴镍铬丝（Nichrome wire），采用可控方式加热；通过直流（Direct Current, DC）电源施加不同电压以达到预设目标温度：
• 28.5℃：室温（对照组）
• 40.0℃：对应电流约1.6 A
• 49.9℃：对应电流约2.4 A
• 71.0℃：对应电流约4.0 A
温度通过福禄克T1105红外相机（Fluke T1105 infrared camera）进行验证与记录。

直接测量的动态参数：车辆与轮速：通过连接至驱动轮的旋转编码器（DC5-24V型号，每转输出600个脉冲）与光学传感器进行测量。
共设置三种运行速度：
• 0.75 m/s
• 1.00 m/s
• 1.30 m/s

数据集结构：

本数据集共包含12组实验工况，由4种轨道温度与3种测试速度（0.75、1.00及1.30 m/s）组合得到。每组工况均包含以下实测与计算得到的参数：速度、摩擦系数（Coefficient of Friction, COF）、制动时间、制动距离、最大滑移以及峰值电流。