Abstract:

A proper design of the disc brake pad shape can restrain high frequency brake squeal. A disc
brake model was built with 300 freedoms and the cut-off frequency of 27kHz to analyze the effect of pad shape
design on the 13kHz squeal. Complex eigenvalue analysis, substructure modal contribution analysis, and feedin
energy analysis were utilized to analyze the effects of 4 pad shapes including the original, the double slotting,
the chamfering, and their combination on the squeal reduction mechanism. The results show that double slotting
pads have little effect but chamfering on both ends has remarkable effect on the squeal. The real part of the
complex eigenvalue decreases by 50% comparing with the original design, which accords with the relevant test
results qualitatively. Due to the variation of modal shape and their composition, the pad chamfering design cuts
down feed-in energy to the noise mode.

Key words: vehicle engineering, disc brakes, brake squeal, complex eigenvalue, substructure mode contribution, feed-in energy