Temperature-dependent noise tendency prediction of the disc braking system

In this paper, with the temperature-dependent contact coupling stiffness and friction coefficient, a modified closed-loop coupling disc braking model was established. Considering the effective temperature range during the actual braking process, the proposed modified coupling model could predict the high-frequency braking noise tendency with satisfied accuracy. Regarding above, the finite element models of main braking parts were firstly established, all the parts were integrated and connected with the friction coefficient and imaginary springs, and the complex eigenvalue analysis was applied on the closed-loop coupling model to calculate the braking noise tendency, etc. In consequence, the relationships between temperature and two key factors (coupling stiffness and friction coefficient) were investigated. The temperature-dependent contact coupling stiffness and friction coefficient were substituted into the proposed model to predict the noise tendencies, the noise tendencies in different frequency bands varying with temperature were obtained. Finally, the effective temperature range during the actual braking process was extracted from the thermodynamic simulation. Considering the effective temperature range, the modified closed-loop coupling model could accurately identify 87.5% braking noise tendencies, and reach a good consistency with test results.