Simulation and testing of modal characteristics of automotive disc brake

Modal characteristics serve as a critical basis for evaluating the vibration and noise performance of automotive brakes. Using the finite element software ABAQUS, modal simulations were performed on the assembly comprising brake disc, brake pad, piston, caliper, and retainer, calculating the modal shapes and frequencies within the specified range. Modal parameters of each component within this range were obtained through measurements using a Doppler laser vibrometer and an NI data acquisition system, as well as hammering tests. By comparing the experimental and simulation results, it was found that the errors for all components were within 5 %, meeting the accuracy requirements. This validation confirms the accuracy of the structural and material parameters of each brake component. The results demonstrate that this type of brake is less susceptible to low-frequency resonance, as the first-order natural frequencies of both the brake disc and the brake pad exceed 1 kHz.