Journal of Chongqing Industry Polytechnic College. 2022, 2(2): 46-56.
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In this work, a full-size finite element model of a
vehicle brake is established, and the relationship between partial wear of
brake pad and brake vibration is explored by combining complex eigenvalue
analysis and explicit dynamic analysis. Results show that the disc brake system
is characterized by multi-frequency vibration coupling. Additionally, when the
brake has a high strength friction vibration caused by the mutual deformation
between the components, the contact interface has the phenomenon of partial
contact or partial detachment, which accordingly leads to the generation of
partial wear of brake pad. Complex eigenvalue analysis results show that with
the increasing of partial wear of pad on the piston side, the vibration
frequency gradually gathers at the high frequency, and the intensity and
tendency of brake vibration increases visibly. In contrast, when the pad on the
finger side occurs partial wear phenomenon, the number of brake vibration
frequency is significantly reduced, whist concentrates in the high frequency
region. However, the vibration intensity of brake system will not change
significantly. This is due to that partial modal coupling modes disappear
caused by the partial wear of the pad on the finger side. Furthermore, the
partial wear of both pads is simulated. Results show that the frequency of
brake vibration gradually changes to higher frequency, and with the increase of
partial wear amount, the number of vibration frequency gradually increases, and
the vibration intensity and tendency of the noise increases as well. Therefore,
although the partial wear of pad on different side has different effects on the
stability of the brake, it eventually leads to serious instability of the brake
system and more serious vibration and noise phenomenon. Explicit dynamic
analysis. results show that the vibration intensity of the brake increases
obviously due to the partial wear on both sides of the pad, and the frequency
of the vibration noise shifts to the high frequency. Results obtained from this
study provide a new idea for the study of tangential partial wear of friction
disc, and provide a certain reference for the subsequent brake design,
optimization and vibration and noise research.
