Analysis of friction excited vibration of drum brake squeal

Drum brake squeal is modelled as friction excited vibration based on the binary flutter mechanism which requires the convergence of two modes experimentally identified using Modal Assurance Criterion. Transient analysis is carried out to determine the brake drum response under braking condition and the model produces squeal mode at 2026 Hz comparable to the measured squeal frequency of 1950 Hz. There are limited combinations of the location of centre of pressure of the shoes that cause squeal. The amplitude of the limit cycle of the drum brake squeal can be reduced by increasing damping, mode frequency separation and reducing the contact stiffness.