Abstract
Two simple two-degree-of-freedom models are presented to describe the dynamical interaction between the pad and the disc of a disc brake system for in-plane and out-of-plane vibrations respectively. Although a brake pad and disc have many modes of vibration, the interaction between a single mode of each component is considered as this is thought to be crucial for brake noise. For both models, the pad and the disc are connected by a sliding friction interface having a velocity dependent friction coefficient.
The results of stability analysis show that damping is the most important parameter in the in-plane vibration, whereas stiffness is the essential parameter in the out-of-plane vibration. Also, Non-linear analysis shows that the addition of damping to either the disc or the pad alone may make the system more unstable in the case of the in-plane vibration.
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