Abstract
•Mathematical equations are experimentally formulated relating the friction coefficient, normal force and sliding speed.•Two models are created for wedge and conventional disc brakes to study their dynamic behaviors as time and freq. responses.•The results indicate that wedge disc brake shoe factor time response is very late as compared to conventional disc brake.•Wedge disc brake pad resonance frequency decreases strongly compared conventional disc brake pad with the same properties.•The sliding speed has a considerable effect on disc brake dynamics; however, it affects more in the case of wedge disc brake.
Mathematical models to study the dynamic behavior of a wedge disc brake are presented in this article. The friction coefficient has a significant role in the brake system dynamics especially, self-energized. A set of experiments have been conducted to formulate mathematical equations relating the friction coefficient, normal force and sliding speed. The effect of main operational parameters of a wedge disc brake such as normal force, sliding speed and wedge angle on the dynamic behavior and their comparisons with conventional disc brake system are investigated. Setting time and frequency response are the main performance indicators to investigate the dynamic behavior of a disc brake. The results indicate that friction coefficient significantly influence the resonance frequency and setting time of wedge disc brake shoe factor. However, the coefficient of friction has a negligible effect on setting time or resonance frequency of conventional disc brake. The effect of sliding speed on a wedge disc brake dynamics is somewhat considerable but it has a little effect on the dynamics of a classical disc brake. Moreover, the wedge angle has a considerable effect on the wedge disc brake dynamics. The normal force has negligible influence on dynamic characteristics of wedge and conventional disc brakes.