Multi-body Dynamics Modeling of Chassis Corner for Brake Creep Groan and Its Analysis

Abstract:

Based on the multi-body dynamics method, a transient dynamic model of brake creep groan was proposed. In this model, the brake system, the suspension system, the structure and spatial position of equivalent transmission system and the brake friction characteristics were considered. The driving torque from transmission system and the brake pressure were regarded as inputs. The stickslip motion and phase diagram of disc against pad, the vibration of key components in brake and suspension system were obtained. In addition, the key transfer path analysis was clarified. The simulation results indicate that the brake creep groan consists of two typical vibration modes. One is the impact mode with large magnitude and short duration, and the other is the periodic mode with lower magnitude but longer duration. The tangential movement dominants the key vibration both in brake and suspension components. The vibration is transferred by the strut and control arm to the body, resulting in the longitudinal movement of the whole vehicle.

Key words:brake creep groan; chassis corner; multi-body dynamic model; stickslip motion; road test