Thermal Transient Analysis of the Railway Brake Disc Using the High-Speed Camera

초록

When the friction braking is applied, high temperatures transition can be occurred in the brake disc from inside high thermal to outside in contact with the friction material. The evaluation technology of brake performance and thermal effects in braking has been generally developed with technology of speed improvement of railway vehicles. Particularly brake system of railway vehicles has a crucial role for the safety as well as riding quality of passengers. Brake dynamometer is designed to simulate the brake characteristic of the high speed train, analyze the experimental object, and also is used to develop and test the brake systems including brake parts. In this paper, we tried to analyze the temperature transition and/or pressure distributions of the brake disc surface during braking using the high-speed brake dynamometer and the high-speed camera with lighting system. Based on information from the acquisition images, we analyzed thermal images in a moment at the same position hourly. The highlight region in thermal image of the disc surface indicates the high temperature. Therefore we could find temperature transition or thermal characteristic of the disc surface. That is, the scattered distribution of thermal moves gradually to a point and be destroyed after that. The results also indicated that the formation and extinction area of hot spot of the disc surface was same region. And these research results will be introduced by means of a braking performance test evaluation technology as well as brake parts development on braking system of the railway vehicles.