MODELING FOR SIMULATION AND NUMERIC ANALYSIS OF CREEP GROAN IN DISC BRAKES

Resumo

According to Brecht, Hoffrichter & Dohle [1], Creep Groan is a low frequency noise, from
20 to 200 Hz, that appearing in automotive brakes, mainly in automatic transmission cars, occurring in
disc brake systems at low pressure and velocity conditions, i. e., in the beginning of movement and
instants previous a complete stop. The Creep Groan noise may be easily identified by drivers and
passengers which impacts directly the impression about the vehicle quality and reliability. Thus a
better understanding of the parameters that cause the phenomenon is necessary to mitigate it and
provide greater comfort to the passengers. Considering the existing means to study the phenomenon, a
computational model was developed to numerical analysis focusing in the friction coefficient
variation, so it may be compared to experimental test results. The model was developed aided by the
MATLAB software. The model consists in a disc brake system simplification, a spring-mass model
with one degree of freedom, so the movement and forces patterns may be easily described and
understood.