Essais & Simulations n°116

Mesures et Methodes de

Mesures et Methodes de Mesure 4 - Conclusion First of all, this paper presents experimental analysis to understand the mechanism of TGV brake squeal. Even if the phenomenon of squeal can be complex, experiments show that squeal can be clearly identified as the emergence of a finite number of frequencies regardless the operating conditions. Secondly, a complete finite element model of TGV brake system has been developed to model vibration instabilities at the origin of disc brake squeal. Then, numerical methods dedicated to stability analysis and transient computations for industrial models have been proposed. Numerical results are in agreement with the experimental tests for the prediction of brake squeal. J-J. Sinou 1 , A. Loyer 1,2 and 3 , G. Mogenier 1 , F. Cocheteux 4 , S. Bellaj 4 , X. Lorang 2 and Acknowledgments The authors gratefully acknowledge ADEME (Agence De l’Environnement et de la Maîtrise de l’Energie) who has partially funded this project AcouFren. [1] X. Lorang, F. Foy-Margiocchi, Q.S. Nguyen, P.E. Gautier, « TGV disc brake squeal », Journal of Sound and Vibration, Vol. 293, pp. 735-746, 2006. [2] D. Brizard, O. Chiello, J-J. Sinou and X. Lorang, « Performances of some reduced bases for the stability analysis of a disc/pads system in sliding contact », Journal of Sound and Vibration, Vol. 330, pp. 703–720, 2011. [3] R.A. Ibrahim, «Friction-induced vibration, chatter, squeal and chaos: Part I- mechanics of contact and friction », ASME Applied Mechanics Review, Vol. 47(7), pp. 209–226, 1994. [4] N.M. Kinkaid, O.M. O’Reilly, P. Papadopoulos, « Automotive disc brake squeal ». Journal of Sound and Vibration, Vol. 267, pp. 105-66, 2003. [5] F. Chevillot, J-J. Sinou, N. Hardouin and L. Jézéquel, « Simulations and experiments of a nonlinear aircraft braking system with physical dispersion », Journal of Vibration and Acoustics, Vol. 132(4), n°041010, 11 pages, 2010. [6] H. Festjens, G. Chevalier, F. Renaud, J-L. Dion, R. Lemaire, « Effectiveness of multilayer viscoelastic insulators to prevent occurrences of brake squeal: a numerical study », Applied Acoustics, Vol. 73(11), pp. 1121-1128, 2012. [7] N. Coudeyras, S. Nacivet and J-J. Sinou, « Periodic and quasi-periodic solutions for multi-instabilities involved in brake squeal », Journal of Sound and Vibration, Vol. 328(4-5), pp. 520-540, 2009. [8] J-J. Sinou, F. Thouverez, and L. Jézéquel, « Methods to Reduce Non-Linear Mechanical Systems for Instability Computation », Archives of Computational Methods in Engineering: State of the Art Reviews, Vol. 11(3), pp. 257-344, 2004. [9] J-J. Sinou, « Transient non-linear dynamic analysis of automotive disc brake squeal - On the need to consider both stability and non-linear analysis », Mechanics Research Communications, Vol. 37, pp. 96-105, 2010. [10] A. Loyer, J-J. Sinou, O. Chiello and X. Lorang, « Study of nonlinear behaviors and modal reductions for friction destabilized systems. Application to an elastic layer », Journal of Sound and Vibration, Vol. 331(5), pp. 1011-1041, 2012. [11] M. Jean, «The non-smooth contact dynamics method », Computer Methods in Applied Mechanics and Engineering, Vol. 177 (3-4), pp. 235–257, 1999. [12] A. Bobillot, E. Balmes, « Iterative computation of modal sensitivities », American Institute of Aeronautics and Astronautics Journal, Vol. 44, pp. 1332- 1338, 2006. [13] F. Chevillot, J-J. Sinou and N. Hardouin, « Nonlinear transient vibrations and coexistences of multi instabilities caused by friction in an aircraft braking system », Journal of Sound and Vibration, Vol. 328(4-5), pp. 555-574, 2009. O. Chiello 3 and 5 Références 1 Laboratoire de Tribologie et Dynamique des Systèmes UMR 5513, Ecole Centrale Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France, email : jean-jacques.sinou@ec-lyon.fr, andrea.loyer@ec-lyon.fr, guillaume.mogenier@ec-lyon.fr 2 SNCF Innovative and Research Department, Physics of Railway System and Passenger Comfort 40 Avenue des Terroirs de France 75611 Paris Cedex 12, France, email : xavier.lorang@sncf.fr, andrea.loyer@sncf.fr 3 IFSTTAR, LTE, F-69675 Bron, France, email : olivier.chiello@ifsttar.fr4 SNCF Agence d'Essai Ferroviaire, 21 Avenue du Président Allende, 94407 Vitry-Sur-Seine, France. 5 Université de Lyon, F-69622 Lyon, France. Essais & Simulations • MARS 2014 • PAGE 20

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