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Variable Friction Coefficient Research on the Base of Motorbike Discbrake Assembly

Obst M., Kurpisz D., Ostrowska K., Majewski K.

Machine Dynamics Research

2017

Vol. 41, No. 2

71--84

This article presents the research of the motorcycle braking process in real road conditions. The theoretical considerations of braking mechanics, construction of braking systems and friction phenomena that take place during motorcycle braking are presented. New and original concepts of acceleration and brake fluid pressure measuring systems are also submitted. The built measuring system was installed on a motorcycle and applied to experimental studies in order to investigate the variable friction coefficient. This original measuring system allows for recording values of pressure changes in the hydraulic braking system, acceleration in three axes and the temperature of the brake disc all at the same time. The obtained data allowed the calculations of several characteristics, e. g. motorcycle speed, brake power, braking distance and variable friction coefficient. As a result of this research, a special measuring system was prepared and a series of characteristics showed an interesting reflection of complex physical phenomena which motorbikes are subjected to during braking time. Information about variable friction coefficient obtained from energy based methods can be useful in theoretical investigation of friction phenomena.