| 초록 |
In this study, the effects of the disc thickness variation(DTV) and runout on the brake cold judder were investigated through an experiment. A vehicle test was performed to measure hydraulic pressure fluctuation, brake torque variation, and vibrations at the brake pedal, the low arm, and the steering wheel. Also, a road test without braking was conducted to investigate the growing process of DTV. It was found that the cold judder was closely related to DTV, but it was also affected by the runout. Furthermore, disc runout caused DTV growth, which led to the cold judder. Finally, severe vibrations due to the cold judder could be reduced by controlling the runout, and adjusting the modal characteristics of the vehicle subsystems, including the lower arm, the steering wheel, and the dashboard. |
