1C25 Influence of Initial SRO and DTV on Brake Judder Based on the Disc Brake Model with Multi-points Contact

For a disc brake system,the couples of brake disc and brake pads were supposed to be multi-point contact,and the brake dynamic model with multi-point contact was established considering a semi-empirical theoretical model of a friction coefficient-relative speed curve,which was verified by the rig experiment.Based on the model,assuming that the initial DTV and SRO could be represented mathematically as sinusoidal functions,the influence of the order,the maximum value and the phase of the initial DTV and SRO on brake judder were discussed in detail using the evaluation indicators of the time-frequency characteristics and the root mean square of the BPV and BTV.The results showed that the order of the DTV produces the order for the frequency of the BPV and BTV versus the angular velocity;the BPV has the stronger sensitivity to the SRO and the BTV has the stronger sensitivity to the DTV;the roots mean square of the BPV and BTV have linear incremental relations to the maximum values of the SRO and DTV;the phase of the SRO influences the BPV and BTV by changing the maximum value of the DTV.