Pressure Change and Variation of Vibration in an Automotive Disk Brake System Due to Hot Spot

In an automotive disk brake system, when the disk shows TEI at the speed over the critical one, hot spot forms on the disk surface and local contact friction is developed between the disk surface and the pad due to the hot spot. This non-uniform contact friction worsens the local heat concentration on the disk surface and has a direct effect on the disk pad, through which it affects the oil pressure supplier of the disk. The pressure change in the oil pressure supplier then affects the hot spot on the disk surface through the disk pad. This shows that there is a correlation between the vibration caused by the contact friction and the pressure change. The correlation between the pressure change in the disk with hot spot and DTV is analyzed. Since the brake vibration has several periodic elements, the unique characteristics of the brake vibration are analyzed, removing those elements with cepstrum and lifter-spectrum.