Time/frequency analysis of contact-friction instabilities. Application to automotive brake squeal.
TypeCommunications avec actes
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.
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
VERMOT DES ROCHES, Guillaume; BALMES, Etienne; BEN DHIA, Hachimi; LEMAIRE, Rémi; PASQUET, Thierry (Taylor and Francis, 2010)Handling of large industrial mechanical assemblies implies structure interactions commonly modeled with contact formulations. In cases where component interfaces are discretized using non conforming meshes, classical contact ...
Design oriented simulation of contact-friction instabilities in application to realistic brake assemblies VERMOT DES ROCHES, Guillaume; BALMES, Etienne; LEMAIRE, Rémi; PASQUET, Thierry (2010)This paper presents advances in non-linear simulations for systems with contact-friction, with an application to brake squeal. A method is proposed to orient component structural modifications from brake assembly simulations ...
MARTIN, Guillaume; BALMES, Etienne; VERMOT DES ROCHES, Guillaume; CHANCELIER, Thierry (2016)Squeal occurrences are quite common in brakes in production and involve coupling of modes. Detailed understanding of vibration patterns typically requires FEM models updated using test results. The process used at Chassis ...
Squeal measurement using operational deflection shape. Quality assessment and analysis improvement using FEM expansion. BALMES, Etienne; VERMOT DES ROCHES, Guillaume; CHANCELIER, Thierry; MARTIN, Guillaume (FISITA, 2017)In presence of squeal, Operational Deflection Shapes (ODS) are classically measured to gain understanding of brake behavior. A simple numeric example is analyzed to justify the use of time-frequency analysis and shows that ...
MARTIN, Guillaume; BALMES, Etienne; VERMOT DES ROCHES, Guillaume; CHANCELIER, Thierry (2015)To be confident in the prediction capability of a model, verification and validation steps are classically performed. Verification checks that the model is properly solved. Since the model used are fairly standard, this ...