This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Pass-by Noise Simulation and Optimization of Acoustic Shielding Package
Technical Paper
2017-26-0213
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In the context of the upcoming reduction of Pass-By-Noise limits in the EU regulations, automotive manufacturers need to implement new concepts of shielding package. ECOBEX is a French funded research project aiming at reducing the powertrain noise contribution of the vehicle, whilst restricting additional mass and cost. Bringing together OEM, raw materials suppliers, shielding manufacturers, universities and specialized consultants in this research program enabled innovations in materials, design, tests and computational methods. This paper will focus on a new procedure for the optimization of the shielding package, based on a precise 3D localization and quantification of the acoustic sources of the powertrain and on their implementation in an Energy Boundary Element model, computing the acoustic propagation. Intensity maps emphasized the dominant acoustic paths and highlighted mitigation opportunities in terms of absorption and insulation. The shielding efficiency could then be optimized with an improved accuracy, taking into account the spatial and frequency characteristics of both source and shielding. Materials were chosen to match local absorption and insulation optimums regarding their noise exposure spectra, whilst coping with all industrial constraints. Measured and computed results are encouraging, and the optimized shielding package is shown.
Recommended Content
Authors
Topic
Citation
Thivant, M. and Bouvet, P., "Pass-by Noise Simulation and Optimization of Acoustic Shielding Package," SAE Technical Paper 2017-26-0213, 2017, https://doi.org/10.4271/2017-26-0213.Also In
References
- Minck , O. et al. Array based acoustic power measurement, Renault Pass-By Noise Proceeding of NVHG Congresse Japan 2016 887 909
- Yoon , S.H. and Nelson. P.A. A method for the efficient construction of acoustic pressure cross-spectral matrices Journal of sound and vibration 2000 233 5 897 920
- Le Magueresse , T. and Minck , O. Source localization inside cabin using calculated Green’s function Automotive NVH Confort, SIA 2012
- Le Magueresse , T. Approche multidimensionnelle du problème d’identification acoustique inverse PhD Thesis 2016
- Pavic , G. A technique for the computation of sound radiation by vibrating bodies using multipole substitute sources Acta Acustica united with Acustica 2006 92 1 112 126
- Antoni , J. A Bayesian approach to sound source reconstruction: optimal basis, regularization, and focusing JASA 2012
- Thivant , M. , Bouvet , P. , Cloix , A. and Blairon , N. Boundary Element Energy Method for the acoustic design of vehicles shields Proceedings of ISNVH Graz 2008
- Le Bot , A. A vibroacoustic model for high frequency analysis Journal of sound and vibration 211 4 1998 537 554
- Betgen , B. , Thivant , M. , Bouvet , P. , Cloix , A. et al. Boundary Element Energy Method for the acoustic prediction of vehicle external and interior noise - Validation on a mock-up and industrial application Proceedings of DAGA 2011
- Betgen , B. , Thivant , M. , Bouvet , P. , Cloix , A. et al. Boundary Element Energy Method for the acoustic prediction of automotive external noise Proceedings of DAGA 2013