This article begins with a discussion of the general types of porous materials, i.e., rigid, limp, and elastic, and of their general physical properties. The macroscopic properties (e.g., flow resistivity, porosity, tortuosity, etc.) that control the acoustical behavior of each type of porous material are then defined and discussed, as are methods for their measurement. The acoustical characterization of a porous medium is considered next, followed by a discussion of modeling of porous materials with particular reference to elastic porous materials such as foams. The special character of elastic porous materials are illustrated through experimental and computational examples involving sound absorption and sound transmission. In particular, the importance of apparently small details of foam layer boundary conditions is emphasized. Finally, foam finite elements that are capable of predicting the behavior of finite-sized noise control treatments having realistic shapes are discussed. By using foam finite element models it is possible to perform optimal design studies: i.e., to design real treatments that yield optimal acoustical performance at a given treatment volume or weight.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Elastic Porous Materials for Sound Absorption and Transmission Control


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE Noise and Vibration Conference and Exposition ; 1997



    Publication date :

    1997-05-20




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Elastic Porous Materials for Sound Absorption and Transmission Control

    Stuart Bolton, J. / Yeon June Kang / Society of Automotive Engineers | British Library Conference Proceedings | 1997


    Elastic porous materials for sound absorption and transmission control

    Bolton,J.S. / Kang,Y.J. / Purdue Univ.,West Lafayette,US et al. | Automotive engineering | 1997




    Sound Transmission through Stiffened Double-Panel Structures Lined with Elastic Porous Materials

    Mathur, G. P. / Tran, B. N. / Bolton, J. S. et al. | British Library Conference Proceedings | 1992