Numerical computation of noise radiation from breaking systems for squeal noise prediction
Résumé
Many trains have braking systems made of discs and pads which can generate very high noise levels. During the braking, instabilities can be generated in the contact zone between the pads and the disc, leading to high vibrations and high levels of noise radiations for frequencies typically between 1kHz and 15kHz. Numerical computations of noise radiation at these high frequencies for systems having the size of usual train braking systems and their geometrical complexities are difficult with classical methods and thus require special attention. In this paper, different strategies based on the boundary element methods and approximate methods are used for computing the sound radiation from the knowledge of the surface velocity. Contributions of parts of the system such as the disc, the pads and the caliper to the global sound levels are identified. Analysis of the system radiation in terms of spectra and directivities are also presented.
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