A Study of heat transfer and vibration on front/back vented brake disc affecting braking ability

Abstract

The purposes of this study were to investigate the heat transfer and the vibration characteristics caused by front and back vented brake disc which had physically different shapes affecting braking distance. In accordance with the theory of heat transfer, the heat transfer rates of two types of brake disc were different and played an important role in the deformation during usage. The single dynamometer was conducted to the experimental work as an engineering tool with boundary conditions according to JASO C406 standard. One degree of freedom (DOF) acceleration signals on the brake caliper were analyzed. The results obviously discovered that the back vented brake disc was able to reduce the vibration up to 43.5% comparing to the front vented brake disc in case of the braking temperature 200C, initial breaking speed 50 km/h and the hydraulic pressure of 4 MPa. Besides, the hydraulic pressure at 4 MPa generated the maximum vibration. Furthermore, the initial braking speed and the braking temperature were also the important factors. Regarding braking distance results, the results of the experimental work obviously discovered that the back vented brake disc created braking distance shorter than front vented brake disc. Besides, there were important factors as braking temperature, hydraulic pressure and initial speed of braking. Especially, the high braking temperature caused an increase of deceleration and a decrease of braking distance. Moreover, the high hydraulic pressure produced a deduction of braking distance and an increase of deceleration. Finally, the initial speed of braking directly varied to the braking distance