A STUDY ON THE ESTABLISHMENT OF DISC BRAKING FORCE PATTERN TO REDUCE THE WEAR MASS OF PAD

초록

The performance of the braking system of a high-speed train is very important to ensure safety of the train. It is necessary that blends braking forces of various brake systems installed in the train to stop the train or to reduce the speed safely within the designated speed and required distance. Not only the characteristics of all applied brake equipments have to be examined, but also the influences of the ride comfort of passenger and operational conditions of the rolling stock, such as deceleration, jerk and possibility of wheel flat occurrence, should be studied comprehensively, in order to decide the braking force pattern to satisfy the required braking distance. An economical management, such as effective use of generated braking energy and the minimum wear of friction materials (a pad and a brake shoe), should be considered synchronously as well. In this paper an optimization method minimizing the variance of the instantaneous disc baking energy during braking time to search a disc braking force pattern that reduces the wear mass of pad in the disc braking system, which makes the majority of mechanical brake device utilized in a rolling stock, is presented, and the calculated pad wear mass is compared between the conventional disc braking force pattern and the optimization results for Korean high-speed train (HSR-350x).