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Acoustical Design of Vehicle Dash Insulator
Technical Paper
2011-26-0022
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SIAT 2011
Language:
English
Abstract
The acoustical performance of a vehicle dash panel system is rated by the noise reduction, which is calculated from the sound transmission and absorption characteristics. A typical dash insulator consists of a steel panel (vehicle body panel), a porous decoupler and heavy layer in the form of sandwich construction. The use of dash panel is to block engine noise from entering into the interior cabin. In the present study the transmission loss of dash panel has been evaluated in reverberation chambers and the sound absorption of dash panel has been determined in impedance tube. This paper deals with improving over all sound transmission loss and shifting of the double wall resonance well below the engine firing frequencies by changing the decoupler materials such as felt and foams of different density and thickness and heavy layer mass per unit area. Numerical simulation of dash panel is also carried out for predicting sound absorption and sound transmission loss of different combinations. The simulation requires intrinsic properties of poroelastic and viscoelastic materials of dash panel. These properties are measured using standardized test rigs and inverse techniques. A parametric study is also carried out to check the effect of intrinsic parameters on sound absorption and sound transmission loss. Finally the simulated results will be validated with experimental results.
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Citation
Jain, S., Shravage, P., Joshi, M., and Karanth, N., "Acoustical Design of Vehicle Dash Insulator," SAE Technical Paper 2011-26-0022, 2011, https://doi.org/10.4271/2011-26-0022.Also In
References
- Cordioli, Julio Cotoni, Vincent Shorter, Phil “Numerical Investigation of the Transmission Loss of Seals and Slits for Airborne” SEA Predictions, SAE Paper No. 2009-01-2205 2009
- ASTM E1050 08 Standard Test Method for Impedance and Absorption of Acoustical Materials Using A Tube Two Microphones and A Digital Frequency Analysis System 2008
- SAE J1400-Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies, SAE Standards 2010
- Biot, M A “Theory of Propagation of Elastic Waves in a Fluid Saturated Porous Solid, I Low Frequency Range, II. High Frequency Range” J. of Acoust. Soc. of Am. 28 168 191 1956
- Allard, J F “Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials” Elsevier Ireland 2010
- Song, B H Bolton, S J “Effect of Circumferential Edge Constraint on the Acoustical Properties of Glass Fiber Materials” Journal of Acoustical Society of America 110 2902 2916 2001
- Lai, H Y Katragdda, S Bolton, J S. “Layered Fibrous Treatments for Sound Absorption and Sound Transmission” SAE Paper No. 972064 1553 1560 1997
- Champoux, Y Stinson, M R Daigle, G A “Air-Based System for the Measurement of Porosity” J. of Acoust. Soc. of Am. 89 910 916 1991
- ASTM-C522 “Acoustics-Materials for Acoustical Applications-Determination of Airflow Resistance” 1991
- Shravage, Paresh Bonfiglio, Paolo Pompoli, Francesco “Hybrid Inversion Technique for Predicting Geometrical Parameters of Porous Materials” Proc. of Acou. 08 June 29 July 04 Paris France 2008
- SAE J1637 Laboratory Measurement of the Composite Vibration Damping Properties of Materials on a Supporting Steel Bar 2007
- ASTM C423 09a Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method 2009
- ISO 354 Acoustics - Measurement of sound absorption in a reverberation room 2003
- ASTM E2611 09 Standard Test Method for Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix Method 2009