To achieve efficient brake operation, acceptable temperatures must be maintained during all service conditions. Throughout a heavy-duty single brake application virtually all the thermal energy is absorbed by the brake disc and pad, the short braking time does not allow significant heat dissipation. Brake disc thermal capacity must be sufficient to ensure acceptable temperature rise, keeping brake temperatures within the safe operating range. For repeated brake applications or drag braking, the brake disc must be able to dissipate the thermal energy that is generated. If temperatures are allowed to become too high, deterioration of the brake structural integrity and friction performance will take place. Studies of automotive disc brake cooling characteristics have been performed experimentally using a specially developed Spin Rig, as well as numerical modelling methods, FE and CFD. All modes of heat dissipation have been studied in detail and a drag brake application modelled to determine the contribution of individual modes to the disc cooling. The Spin Rig experiments enabled the determination of the thermal contact resistance between the disc and wheel carrier. The analyses demonstrated the sensitivity of this mode to clamping pressure. For convective cooling, very similar results were obtained using Spin Rig experiments and CFD analyses. The nature of radiative heat dissipation implies substantial effects at high temperatures. The results indicate substantial change of emissivity throughout the brake application.
Analysis of automotive disc brake cooling characteristics
Untersuchung der Abkühlcharakteristiken von Fahrzeugscheibenbremsen
2002
11 Seiten, 9 Bilder, 2 Tabellen, 12 Quellen
Aufsatz (Konferenz)
Englisch
Analysis of automotive disc brake cooling characteristics
Tema Archiv | 2003
|Analysis of automotive disc brake cooling characteristics
Online Contents | 2003
|Analysis of automotive disc brake cooling characteristics
British Library Conference Proceedings | 2002
|Analysis of automotive disc brake cooling characteristics
SAGE Publications | 2003
|Analysis of automotive disc brake cooling characteristics
Kraftfahrwesen | 2003
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