Numerical and analytical investigation of temperature distribution in a brake drum with simulated defects

One of the most important factors affecting brake performance is the temper ature of the drum-lining contact Surface, as excessive heating will drastic ally reduce the friction coefficient. In this paper, we investigate the tem perature distribution in a brake drum by emphasizing the effect of a reduce d contact area with the lining as a result of wear or geometric deformation . Three models of varying degree of complexity are used for the analysis. A n empirical formula, available in the open literature, has been expanded to accurately predict the transient variation of drum temperature. Its calibr ation and validation have been performed with a one-dimensional and an axi- symmetric model based on finite element discretization with unstructured gr ids. The physical model is based on the transient energy equation and accou nts for convective and radiative heat transfer. Influence of defects on the drum-lining interface is also simulated and brake performance is evaluated for this non-ideal case using the three models. This approach provides an accurate and effective tool for the heat transfer analysis in the brake dru m and, therefore, for the design of brake foundations.