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Evolution of Trim Modeling with PEM for Structureborne Noise Prediction in Full Vehicle
Technical Paper
2015-01-2235
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The need in the automotive industry to understand the physical behavior of trims used in a vehicle is high. The PEM (poro-elastic method) was developed to permit an explicit representation of the trims in the FEM full vehicle models and to give tools to diagnose the effect of the trims and test design changes (porous material property, geometry, etc.,). During the last decade, the evolution of software and hardware has allowed the creation of models with highly detailed trim description (porous material using Biot parameters, plastic trims, etc.,). These models can provide good correlation up to 400Hz compared to measurements in contrast to classical NSM (Non Structural Mass) methodology which shows limitations.
This paper will first introduce the classical method using non-structural masses, local masses and high values of acoustic damping to represent the trim which shows limitations for predicting the response above 200Hz and does not allow a detailed analysis of the effect of trims on the vibro-acoustic behavior of the vehicle. A review of the literature of the evolution of the modeling techniques for full vehicles with PEM representation of the trims is presented from early models with only some porous trims represented as PEM to the latest ones where most of the trim parts ranging from acoustic porous trim (dash insulator, absorbers, etc.,) to the elastic plastic parts (dashboard, pillar trims, etc.,) are included in the model. The influence of modeling accurately the coupling conditions between the trims and the inner cavity or the structure will be discussed. The different results available to diagnose the problems and the influence of the design improvements and visualize them via methods such as intensity contour plots will be introduced.
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Caillet, A. and Blanchet, D., "Evolution of Trim Modeling with PEM for Structureborne Noise Prediction in Full Vehicle," SAE Technical Paper 2015-01-2235, 2015, https://doi.org/10.4271/2015-01-2235.Also In
References
- Atalla N. et al. A mixed pressure-displacement formulation for poroelastic materials J. Acoust. Soc. Am. 104 3 1444 1452 1998
- Atalla N. al. Enhanced weak formulation for the mixed (u,p) poroelastic equations J. Acoust. Soc. Am. 109 6 3065 3068 2001
- Allard J.F Propagation of Sound in Porous Media, Modelling of sound absorption Charpman & Hall North Way Andover, Hampshire, SP105BE, England 1993
- ANCIANT M. et al. Full trimmed vehicle simulation by using Rayon-VTM JSAE Japan 2006
- DUVAL A. et 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. et al. Faurecia vehicle acoustic synthesis method: A hybrid approach to simulate interior noise of fully trimmed vehicles Congrès SIA Confort automobile et ferroviaire 2004 Le Mans
- Duval A. et al. Vehicle acoustic synthesis method 2 nd generation: an effective hybrid simulation tool to implement acoustic lightweight strategies Journées SFA/Renault/SNCF Guyancourt 2005
- Omrani A. et al. Transmission loss modeling of trimmed vehicle
- Atalla Y. , Panneton R Inverse acoustic characterization of open cell porous media using impedance tube measurements Canadian Acoustics 33 1 2005
- Panneton , R. , Atalla , Y. , Blanchet , D. , and Bloor , M. Validation of the Inverse Method of Acoustic Material Characterization SAE Technical Paper 2003-01-1584 2003 10.4271/2003-01-1584
- FOAM-X User's guide
- ESI Group VPS Solver Reference Guide
- Henrich B. et al Using VTM (Vehicle Trim Modeler) to Represent Acoustic Trim Effect on Full Vehicle Level VAUC2011 Sindelfingen 2011
- Caillet , A. , Guellec , A. , Blanchet , D. , and Roy , T. Prediction of Structureborne Noise in a Fully Trimmed Vehicle Using Poroelastic Finite Elements Method (PEM) SAE Technical Paper 2014-01-2083 2014 10.4271/2014-01-2083