Technical Paper
A Suspension Tuning parameter study for Brake Pulsation
2024-04-09
2024-01-2319
Brake pulsation is a low frequency vibration phenomenon in brake judder. In this study, an analytical full vehicle dynamics model has been developed to represent brake pulsation behavior of a mid-size sedan. Brake torque variation (BTV) due to brake thickness variation from uneven rotor wear is represented mathematically in a sinusoidal form. The BTV plays a frequency sweep while the vehicle is braking. The suspension vibration from the brake torque variation is exciting driver interface points such as the foot floor, seat track and the steering wheel. Steering wheel lateral acceleration at the 12 o’clock position, vehicle body acceleration at driver interfaces, and spindle fore-aft acceleration are reviewed to further understand the physics of brake pulsation. For a given BTV, multiple analyses have been run to understand the relationship between the brake pulsation performance and suspension tuning.