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Adhesion under wheel slipping affects essentially the performance of traction and brake in railway vehicles. However, most of experiments have been made in laboratory rooms. In order to analyze the variation of adhesion, precise measurements of wheel slip speed and braking forces are needed. For the purpose, we have newly developed an adhesion test device using a continuous measurement system including speed and torque detection devices. The experimental results using the test vehicle show that the adhesion force varies nearly according to the wheel slip rate. By means of this method, adhesion coefficient has come to be evaluated in a wide range of wheel slip rates . Authors discussed the state of adhesion and made clear that though the adhesion coefficient generally decreased with an increase of the slip rate, the maximum value of adhesion coefficient could come under about 5% slip rate. We proposed a wheel slip protection concept for high availability of braking force during wheel slipping based on results of these experiments.

A study on Adhesion between Wheels and Rails in Wheel Slipping for High Availability of Braking Force