关键词: 兵器科学与技术, 传热学, 瞬态温度, 有限元仿真, 测量温度

Abstract: The high-speed sliding electrical contact leads to the friction and wear problems under special conditions. The transient temperature rise between the armature and the rail is a main factor to cause the material failure in the condition of big current. In order to study the factors to cause the temperature rise of armature, a two-dimensional finite element model of friction pair is established based on the theory of heat transfer, and the method for controlling the single variable is used to study the influence rule of simulation parameters on the armature temperature rise. The results show that the maximum temperature of armature increases with the increase in current, sliding distance and friction coefficient of contact surface. The maximum temperature varies in a “U” trend with the increase in the contact pressure. On this basis, the surface temperature measurement experiment of electrical contact element was conducted. The experimental results are consistent basically with the theoretical analysis results, which shows the effectiveness of the simulation model. This research achievement is expected to provide a technique basis for how to select the appropriate material of the contact pair, reduce the temperature rise, and improve the electrical contact property. Key

Key words: ordnancescienceandtechnology, heattransmissionscience, transienttemperature, finiteelementsimulation, temperaturemeasurement