Sound-Insulation Layers Low-Frequency Modeling, Using the Fuzzy Structure Theory

2009-01-2221

05/19/2009

Event
SAE 2009 Noise and Vibration Conference and Exhibition
Authors Abstract
Content
Over the past few years, car manufacturers have improved their numerical models for the prediction of the trimmed body vibroacoustic response. In the low-frequency band [20, 200] Hz, sound-insulation layer modeling remains a critical topic. Recent work allows the connection of the structure and cavity through a transfer matrix computed from a FE model of the sound-insulation layer. Nevertheless, such an approach requires a FE model of sound-insulation layer, which may not be available in early design stages. Moreover, considering the uncertainty of the design itself, in addition to material uncertainty, a deterministic model may not be appropriate. In this paper, a simplified model of sound-insulation layers based on the fuzzy structure theory is proposed. The simplified model is obtained by performing a statistical averaging of the internal dynamical degrees of freedom of the sound-insulation layer and is governed by three parameters: the modal density, the coefficient of participating mass and the damping rate of the sound-insulation layer. In order to improve the prediction, the model errors introduced by the simplifications as well as material properties uncertainty are modeled using a nonparametric probabilistic approach. After the fuzzy model is set up theoretically, it is applied to a simplified case. The way how the fuzzy model's parameters are related to design parameters will then be discussed. Finally, the application to a full trimmed body is presented.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-2221
Pages
7
Citation
Gagliardini, L., Fernandez, C., and Soize, C., "Sound-Insulation Layers Low-Frequency Modeling, Using the Fuzzy Structure Theory," SAE Technical Paper 2009-01-2221, 2009, https://doi.org/10.4271/2009-01-2221.
Additional Details
Publisher
Published
May 19, 2009
Product Code
2009-01-2221
Content Type
Technical Paper
Language
English