RTRI REPORT May 2000

Appropriate Brake Control Based on Adhesion Characteristics

Seigo UCHIDA, Tadao OHYAMA, Yoshio NOMURA


  Appropriate brake control must satisfy two requirements, securing shorter stopping distances and maintaining better wheel tread conditions. This paper shows major points in the adhesion characteristics in relation to the magnitude of slip, which were investigated by the experiments on a rolling testing machine, and presents analytical results obtained from a dynamic model that represents the relationship between the adhesion and braking forces from micro slip to gross sliding. To secure the desired deceleration rate while maintaining good wheel tread conditions, it is generally preferable to utilize the adhesion force in a micro slip region under normal brake action. On the other hand, in order to make the stopping distance as short as possible in emergency brake, it is effective to utilize the adhesion force in the gross sliding region while permitting deterioration of wheel tread surfaces.



Copyright (c) 2000 Railway Technical Research Institute