This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Extended Solution of a Trimmed Vehicle Finite Element Model in the Mid-Frequency Range
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 30, 2020 by SAE International in United States
Annotation ability available
Event: 11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
The acoustic trim components play an essential role in Noise, Vibration and Harshness (NVH) behavior by reducing both the structure borne and airborne noise transmission while participating to the absorption inside the car and the damping of the structure. Over the past years, the interest for numerical solutions to predict the noise including trim effects in mid-frequency range has grown, leading to the development of dedicated CAE tools.
Finite Element (FE) models are an established method to analyze NVH problems. FE analysis is a robust and versatile approach that can be used for a large number of applications, like noise prediction inside and outside the vehicle due to different sources or pass-by noise simulation. Typically, results feature high quality correlations. However, future challenges, such as electric motorized vehicles, with changes of the motor noise spectrum, will require an extension of the existing approaches.
In this paper, the vibro-acoustic frequency response of an existing MSC Nastran FE model is extended using the Actran Statistical Energy Analysis (SEA) approach, Virtual SEA. In Virtual SEA, the necessary information required to build the SEA system is extracted from the FE models. The fluid-structure Coupling Loss Factors (CLF) are computed through the Statistical modal Energy distribution Analysis (SmEdA) method. This method is a suitable candidate to account for acoustic trim effects based on analytical approach.
The case studied consists of a trimmed body car model transfer function calculation. The result of the case study is an extensive correlation study containing measured and simulated transfer functions in low and mid-frequency range. Simulation results are derived from two approaches, FE method and Virtual SEA method.
CitationSipos, D., Brandstetter, M., Guellec, A., Jacqmot, J. et al., "Extended Solution of a Trimmed Vehicle Finite Element Model in the Mid-Frequency Range," SAE Technical Paper 2020-01-1549, 2020, https://doi.org/10.4271/2020-01-1549.
- Gagliardini, L., Houillon, L., Petrinelli, L., and Borello, G. , “Virtual SEA: Mid-Frequency Structure-Borne Noise Modeling Based on Finite Element Analysis,” SAE Technical Paper 2003-01-1555, 2003, https://doi.org/10.4271/2003-01-1555.
- Lyon, R.H., and Maidanik, G. , “Power Flow between Linearly Coupled Oscillators,” The Journal of the Acoustical Society of America 34(5):623-639, 1962.
- Smith, P.W. Jr. , “Response and Radiation of Structural Modes Excited by Sound,” The Journal of the Acoustical Society of America 34(5):640-647, 1962.
- Shorted, P., and Cotoni, V. , Statistical Energy Analysis in Engineering Vibroacoustic Analysis: Methods and Applications (Chichester, West Sussex, United Kingdom: John Wiley & Sons, Ltd., 2016), 339-383. ISBN:978-1-119-95344-9.
- Free Field Technologies , “Actran 2020 User’s Guide Vol. 1: Installation, Operations, Theory and Utilities.”
- Preis, S. and Borello, G. , “Prediction of Light Rail Vehicle Noise in Running Condition using SEA,” in INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 253(5), Institute of Noise Control Engineering, 2016.
- Dande, H., Wang, T., Maxon, J., and Bouriez, J. , “SEA Model Development for Cabin Noise Prediction of a Large Commercial Business Jet,” SAE Technical Paper 2017-01-1764, 2017, https://doi.org/10.4271/2017-01-1764.
- Tathavadekar, P., de Alba Alvarez, R., Sanderson, M., and Hadjit, R. , “Hybrid FEA-SEA Modeling Approach for Vehicle Transfer Function,” SAE Technical Paper 2015-01-2236, 2015, https://doi.org/10.4271/2015-01-2236.
- Martínez-Calvo, B., Roibas, E., Chimeno, M., Fajardo, P. et al. , “Development of FEM/BEM and SEA Models from Experimental Results for Structural Elements with Attached Equipment,” European Space Agency, (Special Publication) ESA SP. 691.
- Dande, H.A., Wang, T., Maxon, J., Bouriez, J. et al. , “Characterization of Aircraft Components for SEA Modeling,” in INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 254(1), Institute of Noise Control Engineering, 2017.
- Brandstetter, M., Dutrion, C., Antoniadis, P.D., Modillat, P. et al. , “SEA Modelling and Transfer Path Analysis of an Extensive RENAULT B Segment SUV Finite Element Model,” in Aachen Acoustic Colloquium, 2018.
- Sheng, M.P., Wang, M.Q., and Sun, J.C. , “Effective Internal Loss Factors and Coupling Loss Factors for Non-Conservatively Coupled Systems,” Journal of Sound and Vibration 209(4):685-694, 1998.
- Beshara, M., Chohan, G.Y., Keane, A.J., and Price, W.G. , “Statistical Energy Analysis of Nonconservatively Coupled Systems,” Statistical Energy Analysis, an Overview with Applications in Structural Dynamics, Keane and Price eds, 113, 1997.
- Maxit, L., and Guyader, J.L. , “Estimation of SEA Coupling Loss Factors Using a Dual Formulation and FEM Modal Information, Part I: Theory,” Journal of Sound and Vibration 239(5):907-930, 2001.
- Maxit, L., and Guyader, J.L. , “Extension of SEA Model to Subsystems with Non-Uniform Modal Energy Distribution,” Journal of Sound and Vibration 265(2):337-358, 2003.
- 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.
- 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.
- 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.
- Coyette, J., 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, https://doi.org/10.4271/2007-01-2340.
- 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.
- Van Antwerpen, B., Corveleyn, S., Lielens, G., and Van den Niewenhof, B. , “Validity of the Transfer Matrix Method for Modeling Trim Components in Vibro-Acoustic Applications,” in ISMA International Conference on Noise and Vibration Engineering, 2018.
- 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.
- Destefanis, S., Bellini, M., and Talbot, A. , “Analysis of IXV Space Hardware Exposed to Acoustic Diffuse Random Field,” in European Conference on Spacecraft Structures, Materials and Environmental Testing, 2018.