Abstract

This paper discuss comparative studies of the wheel tread brake with composite brake blocks between under conditions with dry and wet using the dynamometer tests for the high speed trains. Generally brake system of railway vehicles has a crucial role for the safety as well as riding quality of passengers. And brake dynamometers are widely used to evaluate the performance of brake systems and test the brake parts under various environments (weight, velocity, brake force, wet-dry conditions). Especially, in the process of the brake stops, the friction coefficients between under dry and wet conditions must not deviate from each other by more than 15% under the same testing conditions. Experiments on the brake dynamometer for the high speed trains are shown to illustrate the comparative studies of the tread brake of dynamometer tests between under dry and wet conditions with initial vehicle speed at 200 [km/h] and 80 [km/h] considering the 920 [mm] wheel diameter, respectively.