OS10-1-5 Heat flow analysis of judder in the disk brake by using thermocouple

Abstract

Hot judder is a vibration related phenomenon that occurs due to rapid local heat accumulation, called hot spots, in automobile disk brakes. The hot spots that have steep a temperature gradient make the unequal surface area in the brake disk. As result, causes nonuniform contact between disk and pads; and generates low frequency vibrations called judder. If hot judder causes, it becomes the problem at the safety of the vehicle due to reduction in the braking force into reduction of friction force. Therefore we have to reduce occurrence of judder in the vehicle. In this experimental study, we studied relationship between hot spot temperature and judder vibration. The hot spots temperatures were measured by thermocouples to obtain flow data and location temperature data. Also, a highspeed infrared camera was used to visualize the location of hot spots and observe the heat flow within the disk. Through this experiment process we obtained temperature data by hot spot. We analyzed the mode shape and the heat deformation of disk brake by using the finite element package to correlate heat flow and mode shape. Experiment results show that specific mode shapes of the disk brake are influenced by the generation of hot spots.