Comparative Analysis of Temperature Fields in Railway Solid and Ventilated Brake Discs

Abstract

A new approach to numerical simulation using the finite element method (FEM) for the rotational motion of discs for railway vehicle disc brake systems was proposed. For this purpose, spatial models of transient heating due to the friction of such systems with solid and ventilated discs were developed. The performed calculations and the results obtained allowed justification of the possibility of simplifying the shape of the ventilated brake disc through elimination of ventilation channels. This contributes to a significant reduction in computational time, without compromising the accuracy of the results. The spatial and temporal temperature distributions in the ventilated and the solid disc of the same mass were analyzed. The share of energy dissipated due to convection and thermal radiation to the environment in relation to the total work done during a single braking was investigated. The maximum temperature values found as a result of computer simulations were consistent with the corresponding experimental results.

Non-Axisymmetric Modelling of Moving Heat Source for Spatial and Temporal Investigation of Temperature in Railway Vehicles Disc Brake

“…This cease of zigzagged behaviour is likely related to the delay of heat conduction along circumferential direction, as the disc thickness increased from the surface. This is in agreement with other studies who reported 5 mm depth [17]. Hence, the NAMHS provides the better chance to reveal spatial and temporal variation in temperature.…”

“…However, the model didn't consider the spatial variations in heat input. After four years, the same authors modelled moving heat source by rotating disc layer close to friction surface around fixed heat source [17]. Though the model contributed significant drop in computational time, it requires further improvement in accommodating further complexity of disc and pad geometry, including disc surface bolt holes and pad grooves.…”

Influence of the Additive of Ceramic and Intermetallic Powders on the Friction Properties and Temperature of the Wet Clutch Disc

“…Such finite elements generated the most accurate results without the need to use an extremely fine mesh in the area of high temperature gradients. An experience in the construction of a finite element grid was obtained from previously conducted simulations of heat generation in disc brakes [ 25 ] and tread brakes (wheel-rail) of railway vehicles [ 26 ]. It was found that the linear finite elements significantly falsify the calculations (over 20%) even at many times higher than the default mesh density.…”

Analytical Model of the Frictional Heating in a Railway Brake Disc at Single Braking with Experimental Verification

“…So far, various 3D FE models of frictional heating in friction elements that account for their complicated geometry have been proposed and examined [ 11 , 12 , 13 , 14 , 15 ]. A comparative numerical analysis of temperature in the solid and ventilated railway brake discs is presented in the study [ 14 ]. During the development of the calculation models, the ventilated disc has been replaced by a solid disc with the same mass and outer dimensions.…”