Dynamic Friction Heat Model for Disc Brake During Emergency Braking
Abstract:The friction heat and its distribution in the disc brake has quite important influence on the braking reliability and safety of machines. The present models all thought that the braking pressure reaches its preset value at the beginning moment of braking and the angular velocity of the brake disc decreases linearly with time. In this paper, the time effect of braking pressure and the nonlinear effect of braking deceleration were considered to establish the dynamic model for the friction heat during emergency braking of disc brakes. Based on the dynamic model, as an example, the three dimensional temperature field of the disc brake used in mine hoists was simulated and tested by accounting of the dynamic thermal physical properties of its brake shoe. It is shown that the braking pressure cannot reach to its preset value at the beginning moment of braking. It rises gradually with time. As a result, the braking process decelerates uniformly and the angular velocity varies nonlinearly with time. These two factors should be considered when modeling of the friction heat during emergency braking. What is more, as the friction material is generally thermoplastic, so its dynamic thermal physical properties should also be considered. The application of the dynamic model in the disc brake of mine hoists indicated that it has high precisions for calculating the friction heat during emergency braking.
Document Type: Research Article
Publication date: November 1, 2011
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