This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Optimization of Trim Component and Reduction of the Road Noise Transmission Based on Finite Element Methods
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 13, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Event: 10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
The acoustic trim components play an essential role in NVH behavior by reducing both the structure borne and airborne noise transmission while participating to the absorption inside the car. Over the past years, the interest for numerical solutions to predict the noise transmission through trim packages has grown, leading to the development of dedicated CAE tools. The incrementally restrictive weight and space constraints force today CAE engineers to seek for optimized trim package solution. This paper presents a two-steps process which aims to reduce the structure borne road noise due to floor panel using a coupled simulation with MSC NASTRAN and Actran.
The embossment of the supporting steel structure, the material properties of porous layers and the thickness of visco-elastic patches are the design variables of the optimization process. The optimization of the beads and embossments of the metallic floor structure is first performed using NASTRAN SOL200 topography optimizer while considering a reference acoustic trim configuration. Once the optimum embossment pattern is found, the optimization of the visco-elastic patches properties and the trim package is started as a second step with Actran for Trimmed Body and the embedded optimization library NLOPT.
The case studied consists in a complete car model including the tires, the suspension, the body, the floor trim and the cavity. This model is loaded by realistic excitations representing the road irregularities. The study demonstrates that the trim package cannot be neglected during the structure optimization process. For a given frequency range, the floor beads and embossments have a minor impact on the overall acoustic response in the car cavity, conversely to the properties of the trim package. On the other hand, the optimization of the trim shows very interesting benefits with a limited weight increase. As a consequence, focusing the efforts to improve the acoustic trim is more efficient in the objective to improve road noise comfort of the passengers.
CitationGuellec, 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.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
|Unnamed Dataset 4|
- Coyette , J.P. , Lielens , G. , Van den Nieuwenhof , B. , Bertolini , C. et al. From Body in White to Trimmed Body Models in the Low Frequency Range: A New Modeling Approach SAE Technical Paper 2007-01-2340 2007 10.4271/2007-01-2340
- 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 10.4271/2007-01-2330
- Van den Nieuwenhof B. , Lielens G. , and Coyette J.P. An Updated Modal Approach for Dealing with Vibroacoustic Damped Models under Random Excitation Noise-Con 2008 Proceedings Dearborn, MI 2008
- d'Udekem D. , Acher F. , Liu W. , Shu K.T. et al. Efficient Analysis of a Fully-Trimmed Car Body Using Modal Approaches Noise-Con 2008 Proceedings Dearborn, MI 2008
- Van den Nieuwenhof B. , Lielens G. , Coyette J.P. , Acher F. et al. Efficient Analysis of Large Trimmed Configurations Using Modal Approaches ISMA 2008
- 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 10.4271/2011-01-1710
- Zhou Z. Jacqmot J. , and Vo-Thi G. Evaluation of Trim Absorption to Exterior Dynamic and Acoustic Excitations Using Hybrid Physical-Modal Approach ISNVH 2014
- Free Field Technologies 2016
- Biot , M.A. Theory of Propagation of Elastic Waves in a Fluid Saturated Porous Solid. I Low-Frequency Range Journal of the Acoustical Society of America 28 2 168 178 1956
- MSC Software 2016
- NLOPT Reference Manual https://nlopt.readthedocs.io/en/latest/