Friction-induced vibration and noise on a brake system

The experimental set-up of a disc brake system are established. The LuGre friction model is adopted to determine the friction force between the disc and the pad. The nonlinear dynamic behavior of the brake pad with non-internal condition is discussed, also the shrill frictional noise signals are investigated. The study shows that with the decrease of disc velocity, the tangential motion of the pad loses its stability, then the pure slip and incomplete stick-slip self-excited vibrations are resulted. The low and high frequency squeal noise are obtained experimentally at the same time. With proper parameters, a chaos phenomenon also can be observed in the tangential motion by the numerical simulation, the experimental test findings are used to verify the numerical simulation results.