Dynamique, interactions et couplages

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HAL Id: hal-01492345

https://hal.archives-ouvertes.fr/hal-01492345

Submitted on 18 Mar 2017

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Dynamique, interactions et couplages

Jean-François Brunel, Philippe Dufrenoy

To cite this version:

Jean-François Brunel, Philippe Dufrenoy. Dynamique, interactions et couplages : Influence de la dynamique locale de contact sur la réponse vibratoire globale d’un système: application au crissement.

8e Colloque national en calcul des structures, CSMA, May 2007, Giens, France. �hal-01492345�

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* Laboratoire de Mécanique de Lille UMR CNRS 8107 Université de Sciences et Technologies de Lille

Cité Scientifique F-59655 Villeneuve d’Ascq [email protected]

RÉSUMÉ. Le crissement, qui reste l’un des phénomènes les plus gênants de par les niveaux sonores générés, est la conséquence de l’excitation de certains modes d’un des composants du système ou du système couplé sous l’effet du contact frottant. Différentes approches sont possibles pour déterminer ces modes. Dans ce travail, un calcul transitoire est mené, qui permet la mise en évidence des mécanismes physiques mis en jeu au sein d’un contact frottant sans introduction de singularité dans la loi de frottement en vitesse. Au travers de la problématique du crissement en courbe, l’approche multi-échelle présentée permet de relier le phénomène de crissement à une propagation d’ondes issues du contact.

ABSTRACT. Squeal noise is defined as noise at frequency upper than 400 Hz and occurs if the system has a very high amplitude mechanical vibration. All systems with sliding contact are prone to squeal: curve squeal noise, disc brake squeal, etc. It is well known that a squeal phenomenon depends on the local kinematics in the contact patch. A multi-scale approach is proposed to explain the mode selection mechanism. Contact surfaces waves are initiated under pressure and sliding velocity conditions leading to self-excitation. The curve squeal noise is treated with this approach.

MOTS-CLÉS: instabilités, ondes, propagation, crissement, contact frottant.

KEYWORDS: instability, waves, propagation, squeal, sliding contact.

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