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Time/frequency analysis of contact-friction instabilities. Application to automotive brake squeal.

Communication avec acte
Author
VERMOT DES ROCHES, Guillaume
BALMES, Etienne
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
PASQUET, Thierry
LEMAIRE, Rémi

URI
http://hdl.handle.net/10985/8232
Date
2010

Abstract

Robust design of silent brakes is a current industrial challenge. Braking systems enter in the more general context of unstable systems featuring contact friction interaction. Their simulation requires time integra- tion schemes usually not adapted to combination of large industrial models (over 600,000 DOF) and long simulations (over 150,000 time steps). The paper first discusses selection of the contact/friction model and adaptations of the integration scheme. The relation between the nominal steady state tangent modes and the system evolution over time is then evaluated. The time response shows a nearly periodic response that is analyzed as a limit cycle. It is shown that instantaneous dynamic stability predictions show stable/unstable transitions due to changes in the contact/friction state. These transitions are thought to give an understanding of the mechanism that limits levels for these self sustained vibrations. The concept is exploited to suggest novel ways to analyze complex modes.

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