Abstract
In this study, three-dimensional thermal modelling has been made for a disc brake mechanism of an automobile by using the COMSOL Multiphysics programme. Frictional heat has been calculated by means of multibody dynamic module, and heat distribution has been calculated by means of heat transfer module. In such model, an automobile with an initial speed of 25 m⁄s and 35 m⁄s has been decelerated by -10 m⁄s^2 braking speed, and the braking state has been realised at time interval of 2-4 s. Thermal analysis has been made for two different vehicle weights (1200 kg-1500 kg) under the same braking scenario. The results obtained from the thermal analysis have shown similarity to various studies carried out within the literature. An increase of 300 kg in vehicle weight has resulted in a temperature increase by 3.33% during motion at 25 m⁄s vehicle speed, and by 6.03% during motion at 35 m⁄s vehicle speed. According to temporal temperature change, maximum pad temperature has been obtained at the 4th second; and in the case that the vehicle with a weight of 1500 kg and moving at 35 m⁄s speed has braked, maximum pad temperature has been obtained as 450 K.
Highlights
Disc brake systems are important machinery equipment, which enable the vehicles to decelerate or stop during the cruise
In disc brake systems, when the brake pedal is pressed, the location of the hydraulic fluid included in the system changes, a friction force occurs for the brake discs by the help of piston and the vehicle is decelerated with the effect of such force
As a result of the thermal analysis; for the vehicle weight of 1200 kg, a temperature of 360 K has been obtained between brake disc and pad at the 4th second of the motion, and a temperature of 330 K has been obtained at the 6th second; for the vehicle weight of 1500 kg, a temperature of 380 K has been obtained between brake disc and pad at the 4th second of the motion, and a temperature of 340 K has been obtained at the 6th second
Summary
Disc brake systems are important machinery equipment, which enable the vehicles to decelerate or stop during the cruise. Zhu et al [14] have examined three-dimensional temperature distribution of a brake lining during an emergent braking by means of finite elements method, approximate integral method, green functions method, Laplace transformation method and integral transformation method. Among such methods, the integral transformation method has provided more reliable results when compared to the. Friction heat has been calculated by composing a finite element brake disc and lining model by means of COMSOL Multiphysics programme, and thermal analysis of brake disc-lining system has been made
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