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Generalized Light-Weight Concepts: A New Insulator 3D Optimization Procedure
Technical Paper
2013-01-1947
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to reach the new 2020 CO2 emissions regulations, we have developed a wide range of lightweight noise treatment technologies going from pure absorbing to highly insulating ones, depending on the pass-through quality situation. This Generalized Light-Weight Concepts family was first optimized using the 2D Transfer Matrix Method (TMM) combined with quick SEA approaches. Taking into account thickness 3D maps with TMM is an efficient and quick intermediate “2,5D” optimization method, but it is not a real 3D approach.
This work presents a new 3D optimization procedure based on poroelastic finite elements including intermediate cavities (like Instrument Panels) for designing these Generalized Light-Weight Concepts. A parallel reflection deals with products and processes in order to check the feasibility of the resulting 3D optimized insulator designs. Indeed, playing with multi-layer insulators (typically three to four layers) leads to some design difficulties for the low thicknesses, typically below 10 mm, especially for felt layers for which a maximum compression rate exists.
This 3D optimization procedure takes into account the design freedom offered by each porous material technology, like foam or felt, but also plays judiciously with airflow resistances of porous layers or non-wovens, as well as compression rates of foiled backed light “fiber septums”, where bending stiffness allows switching from an absorbing behavior to an insulating one etc… This paper illustrates various applications of these Generalized Light-Weight Concepts with and without the influence of pass-throughs as well as intermediate cavities like Instrument Panels, modelized and optimized using 3D poroelastic finite elements and correlated with measurements in coupled reverberant rooms.
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Duval, A., Rondeau, J., Dejaeger, L., Lhuillier, F. et al., "Generalized Light-Weight Concepts: A New Insulator 3D Optimization Procedure," SAE Technical Paper 2013-01-1947, 2013, https://doi.org/10.4271/2013-01-1947.Also In
References
- DUVAL A. Faurecia acoustic light-weight concept Congrès SIA Confort automobile et ferroviaire Le Mans, France 2002
- DUVAL A. and al. Generalized light-weight concept: a comprehensive acoustic package weight reduction strategy Congrès SIA Confort automobile et ferroviaire Le Mans, France 2006
- Duval , A. , Rondeau , J. , Bischoff , L. , Deshayes , G. et al. Generalized Light-Weight Concepts: Improving the Acoustic Performance of Less than 2500 g/m 2 Insulators SAE Technical Paper 2009-01-2136 2009 10.4271/2009-01-2136
- RONDEAU J-F. and al. Vehicle acoustic synthesis method: run-up simulation and 3D design of weight reduction technologies Congrès SIA Confort automobile et ferroviaire Le Mans, France 2008
- DUVAL A. , DEJAEGER L. , BARATIER J. and RONDEAU J-F. Structureborne and airborne Insertion Loss simulation of trimmed curved and flat panels using Rayon-VTM-TL: implications for the 3D design of insulators Congrès SIA Confort automobile et ferroviaire Le Mans, France 2008
- DUVAL A. and al. Trim FEM simulation of a dash and floor insulator cut out modules with structureborne and airborne excitations Euronoise-Acoustics'08 Paris, France 2008
- DUVAL A. , DEJAEGER L. , MORGENSTERN Ch. and RONDEAU J-F. Novel technique for the introduction of curved trims in SEA / Virtual SEA models using poroelastic finite elements in the middle (and high) frequency range Congrès SIA Confort automobile et ferroviaire Le Mans, France 2010
- DUVAL A. , HOANG M-T. , PERROT C. and MARCEL V. Development of acoustically effective foams: a new micro-macro optimization method VDI Tagung Polyurethan 2012 Nürtingen, Germany 2012
- DUVAL A. and BISCHOFF L. Stiff textiles or felts glued on light impervious layers: a new “green” light septum fiber technology SAPEM 2011 conference Ferrara, Italy 2011
- ALLARD J.-F. ATALLA N. Propagation of sound in porous media 2nd John Wiley & Sons 2009
- KANG Y. J. and BOLTON J. S Finite element modeling of isotropic elastic porous materials coupled with acoustical finite elements J. Acoust. Soc. Am. 98 1 635 643 1995
- DEJAEGER L. , RONDEAU J-F. , CHANUDET P. and AUFFRAY B. Transmission Loss trim FEM simulation of lightweight automotive dashboard insulators with consideration of the instrument panel Acoustics 2012 joined SFA and IOA congress Nantes, France 2012
- ZHANG CH. and al. Numerical and experimental study of light-weight concept under automobile applications conditions Styrian Noise Vibration & Harshness Congress Graz, Austria 2008
- ATALLA N. , PANNETON R. , and DEBERGUE P. A mixed displacement-pressure formulation for poroelastic materials J. Acoust. Soc. Am. 104 3 1444 1452 1998
- ANCIANT M. , BOUATTOURA D. and MEBAREK L. Rayon -VTM 2007 for I-deas 11 NX User Manual (TL module) ESI Group Compiègne, France 2007
- ANCIANT M. , MEBAREK L. , ZHANG C. , and MONET-DESCOMBEY J. Full trimmed vehicle simulation by using Rayon-VTM JSAE, Japan 2006
- OMRANI A. , MEBAREK L. and HAMDI M.A Transmission loss modeling of trimmed vehicle components ISMA Conference Leuven, Belgium 2006