Abstract: The temperature field model of the train tread braking is established based on the rotating heat source method and uniformly distributed heat source method. Under the basic braking condition that contains uniform deceleration braking, stopping, uniform acceleration starting and uniform speed running, the temperature change curves of the three points, which locate on the tread, 1 mm and 2 mm below the tread respectively, are calculated based on the rotating heat source method and uniformly distributed heat source method. At the same time, under the conditions of different shoe contact areas, different braking power and continuous five basic braking, the variation rules of the temperature change curves of the three points based on the two heat source loading methods are investigated. The calculation results show that for the point on the tread, the calculated temperature and the change characteristics based on the two heat source loading methods are quite different. However with the increase of the distance below the tread, the calculated temperature difference based on the two heat source loading methods decreases rapidly, and for the point 2 mm below the tread, the difference can be approximately ignored. In addition, under the condition of continuous braking, the calculated temperature difference of the three points in a certain braking based on the two heat source loading methods is not related to the previous braking.

Key words: rotating heat source method, temperature field, tread braking, uniformly distributed heat source method