This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Varying the Polyurethane Foam Ratio for Better Acoustic Performance and Mass Savings
Technical Paper
2011-01-1736
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Flexible molded polyurethane foams are widely used in automotive industry. As porous-elastic materials, they can be used as decoupler layers in conventional sound insulation constructions or as sound absorbers in vehicle trim parts. Flexible molded polyurethane foams are produced by reacting of liquid Isocyanate (Iso) with a liquid Polyol blend, catalysts, and other additives. Their acoustic performance can be changed by varying the mixing ratio, the weight proportion of two components: Iso and Polyol. Consequently, the sound insertion loss (IL) of barrier/foam constructions and acoustic absorption of a single foam layer will vary. In this paper, based on one industry standard flexible molded polyurethane foam process, the relationship between foam mixing ratio and foam acoustic performance is studied in terms of IL and sound absorption test results. Moreover, considering that mass saving is becoming more and more important in vehicle sound package development, the study specifically focuses on comparing the mass savings potential of different mixing ratio foams using Statistical Energy Analysis (SEA) predictions and measurement results. Finally, it is shown that lower mixing ratio foams can achieve higher IL and save mass. This was validated by one inner dash mat acoustic development application.
Recommended Content
Authors
Topic
Citation
Yin, G., Oweimreen, T., and Ladewig, J., "Varying the Polyurethane Foam Ratio for Better Acoustic Performance and Mass Savings," SAE Technical Paper 2011-01-1736, 2011, https://doi.org/10.4271/2011-01-1736.Also In
References
- ASTM C423-09a “Standard Test Method for Sound Absorption and Sound Absorption Coefficient by the Reverberation Room Method,” ASTM International 2009
- SAE International Surface Vehicle Recommended Practice “Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies,” SAE Standard J1400 Aug. 2010
- Allard, J-F. “Propagation of Sound In Porous Media: Modeling Sound Absorbing Materials,” Chapman & Hall North Way, Andover Hampshire, SP10 5BE, England
- Skinner, Chris Peters, Johan Vandenbroeck, Jan “Acoustic Absorber: A Third Way for the Management of Sound in Automobiles,” UTECH Europe-2006 Conference March 26 30 Maastricht, Netherlands
- Chekkal, M. Bianchil Remillat1, C. “Vibro-Acoustic Properties of Auxetic Open Cell Foam: Model and Experimental Results,” ACTA ACUSTICA UNITED WITH ACUSTICA 96 2010 266 274
- Broos, R. Sonney, J.-M. Thanh, H. Phan Casati, F.M. “Polyurethane Foam Molding Technologies for Improving Total Passenger Compartment Comfort,” 35th Annual Polyurethane Technical/Marketing Conference Oct. 8 11 2000 Boston, MA
- Atalla, Y. Panneton, R. “Inverse acoustical characterization of open cell porous media using impedance tube measurements,” Canadian Acoustics 33 1 11 24 2005