电磁轨道推进接触温度的特性研究

Research on Characteristics of Contact Temperature in Electromagnetic Rail Propulsion

在电磁轨道推进过程中,固体电枢和轨道接触面温度是衡量接触状态的重要指标之一,能够在一定程度上表征在电磁轨道推进过程中影响轨道推进性能和推进效率的轨道损伤程度。针对电磁轨道推进的电枢和轨道接触面温度特性,进行相关仿真分析与测量实验研究。根据电接触的基本理论,对电枢和轨道接触面的温度热源进行分析,建立温度模型,结合仿真研究,得出在几种热源作用下电枢和轨道接触面温度的变化情况。以电磁轨道推进装置为试验平台,采用基于红外辐射测温原理的测量系统,对电磁轨道推进装置电枢和轨道接触面温度进行测量,得出了几个典型位置的温度和典型加载电流下的温度数据。结果表明,测量温度在幅值上和趋势上与仿真模拟结果具有一致性。轨道损伤分析也反映了电枢和轨道接触面温度升高加速了轨道表面的烧蚀。

In the process of electromagnetic rail propulsion,the contact area temperature between armature and rails is one of the important indicators to measure contact state,which can characterize the degree of rail damage to some extent and affect the launch efficiency.Corresponding simulation analysis and measurement experiment of temperature characteristics are carried out.Based on the theory of electrical contact,the model is developed to analyze heat sources of the contact area and the influences on surface temperature.The change of temperature under different heat sources is obtained by simulation.Taking the electromagnetic rail propulsion device as the test platform,the temperature measurement experiment is carried out by using the measurement system based on infrared radiation.The temperatures of several typical positions under typical loading current are obtained.The results show that the measured temperature is consistent with the simulation results in amplitude and trend.Further analysis of the rail damage test can reflect that the increase of contact surface temperature accelerates the ablation of rail surface.