Single baffles based on heat activated foams have found increasing use as body cavity filler to inhibit noise propagation through hollow body channels of passenger cars. While the benefit of double decoupled layers in noise reduction is well known, no double baffle design was economically feasible previously, due to the limitations of conventional heat activated foams. A double baffle design based on preprogrammed heat activated foam technology is introduced. The preprogramming imparts directional control that enables more effective filling and makes double baffle design possible. The differences between preprogrammed and conventional foams are reviewed, the advantages of preprogrammed foams are presented, and the benefits of the double baffle over the single baffle design are demonstrated by acoustic testing.


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    Title :

    Acoustic double baffle utilizing programmed expandable foam as body cavity seal


    Contributors:
    Chang, R.J. (author) / Dawes, K. (author) / Schwartz, L. (author) / Fick, R. (author)


    Publication date :

    1998


    Size :

    8 Seiten, 9 Bilder, 9 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Acoustic double baffle utilizing programmed expandable foam as body cavity seal

    Chang, R. J. / Dawes, K. / Schwartz, L. et al. | British Library Conference Proceedings | 1998


    Acoustic double baffle utilizing programmed expandable foam as body cavity seal

    Chang,R.J. / Dawes,K. / Schwartz,L. et al. | Automotive engineering | 1998


    Expandable Foams with Programmed Expansion as Body Cavity Filler

    Dawes, Keith / Schwartz, Lawrence D. / Chang, R. J. | SAE Technical Papers | 1998


    Expandable foams with programmed expansion as body cavity filler

    Chang, R.J. / Dawes, K. / Schwartz, L.D. | Tema Archive | 1998


    Expandable Foams with Programmed Expansion as Body Cavity Filler

    Chang, R. J. / Dawes, K. / Schwartz, L. D. et al. | British Library Conference Proceedings | 1998