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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.

Disc Brake Assembly Test Stand Design and Preliminary Motorbike Brake Process Indicators Test

Obst M., Kurpisz D., Zalas A., Stachowski M.

Machine Dynamics Research

2015

Vol. 39, No. 2

15-31

In the paper friction phenomena test stand concept and technical solution is presented. Authors subjected on friction phenomena, based on motorbike disc brake assembly, prepared its original concept of friction and motorbike brakes research. In the publication, a detailed description of construction and system control is contained. Designed motorbike disc brake assembly friction test stand can offer few research programs. It is also possible to introduce own research program based on a real motorbike driving in different traffic conditions. Preliminary motorbike road test results are presented. A motorbike drive possesses characteristics of acceleration, speed, brake road distance, power of acceleration and deceleration. The initial investigation described in this paper can be a good introduction for a more advanced research where variable coefficient of friction and other friction phenomena values can be estimated. On the basis of presented methods, this can also develop an investigation of energy dissipation values. Energy parts designated in brake and friction process can be applied to mathematical description of friction phenomena and mechanical material destruction.