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Efficient Acoustic Trim Components Results Recovery for Industrial Finite Elements Models
Technical Paper
2022-01-0309
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In the automotive industry, acoustic trim components are playing an essential role in vehicle Noise, Vibration and Harshness (NVH). They act in three different ways: reducing the structure vibration, absorbing incident acoustic waves and reducing both the structure-borne and air-borne noise transmission. Mastering acoustic trims is key for interior acoustic comfort, a major differentiator in terms of customer appreciation. An elegant and efficient way to solve trimmed vehicle models numerically is the well documented and widely used Reduced Impedance Matrix (RIM) method. It solves the structure and cavity in modal coordinates, while the acoustic trim components are solved in physical coordinates where their complex damping behavior can be fully captured. This method is very accurate to compute structure and cavity results but couldn’t initially recover data such as pressure or displacement inside the acoustic trim parts. Due to its key role in acoustic performance, the inner damping mechanisms, local deformation and other similar information are determinant to improve the understanding of its global influence. This allows to make precise and efficient changes, resulting in vehicle mass and cost reduction. This paper details an additional facultative step to the RIM method which allows to recover trim results with high accuracy, while keeping the same efficient hybrid implementation. Both the theoretical aspects and the implementation sequence in the complete process is discussed. The method is then applied to a trimmed vehicle, evaluating design changes on acoustic trims.
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Citation
de Walque, C., Brandstetter, M., Corveleyn, S., and Van den Nieuwenhof, B., "Efficient Acoustic Trim Components Results Recovery for Industrial Finite Elements Models," SAE Technical Paper 2022-01-0309, 2022, https://doi.org/10.4271/2022-01-0309.Also In
References
- d’Udekem , D. , Acher , F. , Liu , W. , Shu , K.T. , Shahidi , B. Efficient Analysis of a Fully-Trimmed Car Body using Modal Approaches Noise-Con 2008 Proceedings Dearborn, Michigan 2008
- Yoo , J. , Brandstetter , M. , Jeong , C. , Jacqmot , J. et al. Extensive Correlation Study of Acoustic Trim Packages in Trimmed Body Modeling of an Automotive Vehicle SAE Technical Paper 2019-01-1511 2019 https://doi.org/10.4271/2019-01-1511
- Zhou , Z. , Jacqmot , J. , Vo Thi , G. , Jeong , C. et al. Evaluation of Trim Absorption to Exterior Dynamic and Acoustic Excitations Using a Hybrid Physical-Modal Approach SAE Int. J. Passeng. Cars - Mech. Syst. 7 3 2014 1205 1211 https://doi.org/10.4271/2014-01-2080
- d’Udekem , D. , Saitoh , M. , Van den Nieuwenhof , B. , and Yamamoto , T. Numerical Prediction of the Exhaust Noise Transmission to the Interior of a Trimmed Vehicle by Using the Finite/Infinite Element Method SAE Technical Paper 2011-01-1710 2011 https://doi.org/10.4271/2011-01-1710
- Guellec , A. , Cabrol , M. , Jacqmot , J. , and Van den Nieuwenhof , B. Optimization of Trim Component and Reduction of the Road Noise Transmission Based on Finite Element Methods SAE Technical Paper 2018-01-1547 2018 https://doi.org/10.4271/2018-01-1547
- Bertolini , C. , Gaudino , C. , Caprioli , D. , Misaji , K. et al. FE Analysis of a Partially Trimmed Vehicle using Poroelastic Finite Elements Based on Biot’s Theory SAE Technical Paper 2007-01-2330 2007 https://doi.org/10.4271/2007-01-2330
- Free Field Technologies
- MSC Software 2021
- Weilkiens , Tim 2007
- Biot , M.A. Theory of Propagation of Elastic Waves in a Fluid-Saturated Porous Solid. II. Higher Frequency Range The Journal of the Acoustical Society of America 28 2 1956 179 191 10.1121/1.1908241
- Allard , J.-F. and Atalla , N. Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials Second Hoboken, NJ Wiley 2009