Absorption of oblique incidence sound by a finite micro-perforated panel absorber

C. Yang, L. Cheng, Jie Pan

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to calculate the sound energy absorbed by the MPP's surface. Results show that the absorption coefficient of the absorber is a function of angle and frequency of the incident sound, and is controlled by the coupling between the MPP and the acoustical modes in the back cavity. In particular, grazing modes can be induced in the cavity by sound with an oblique angle of incidence, which may result in peak sound absorptions at the natural frequencies of the modes. The mechanism involved is used to explain the absorption properties of the MPP absorber for a diffuse incidence of sound. © 2013 Acoustical Society of America.
    Original languageEnglish
    Pages (from-to)201-209
    JournalJournal of the Acoustical Society of America
    Volume133
    Issue number1
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    absorbers
    incidence
    acoustics
    sound transmission
    cavities
    massively parallel processors
    plate theory
    baffles
    thin plates
    grazing
    resonant frequencies
    absorptivity
    Sound
    impedance
    energy

    Cite this

    @article{4d264d9cdfa04b2fa2fff1bbd4d22398,
    title = "Absorption of oblique incidence sound by a finite micro-perforated panel absorber",
    abstract = "In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to calculate the sound energy absorbed by the MPP's surface. Results show that the absorption coefficient of the absorber is a function of angle and frequency of the incident sound, and is controlled by the coupling between the MPP and the acoustical modes in the back cavity. In particular, grazing modes can be induced in the cavity by sound with an oblique angle of incidence, which may result in peak sound absorptions at the natural frequencies of the modes. The mechanism involved is used to explain the absorption properties of the MPP absorber for a diffuse incidence of sound. {\circledC} 2013 Acoustical Society of America.",
    author = "C. Yang and L. Cheng and Jie Pan",
    year = "2013",
    doi = "10.1121/1.4768869",
    language = "English",
    volume = "133",
    pages = "201--209",
    journal = "Journal of Acoustical Society of America",
    issn = "0001-4966",
    publisher = "ASA",
    number = "1",

    }

    Absorption of oblique incidence sound by a finite micro-perforated panel absorber. / Yang, C.; Cheng, L.; Pan, Jie.

    In: Journal of the Acoustical Society of America, Vol. 133, No. 1, 2013, p. 201-209.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Absorption of oblique incidence sound by a finite micro-perforated panel absorber

    AU - Yang, C.

    AU - Cheng, L.

    AU - Pan, Jie

    PY - 2013

    Y1 - 2013

    N2 - In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to calculate the sound energy absorbed by the MPP's surface. Results show that the absorption coefficient of the absorber is a function of angle and frequency of the incident sound, and is controlled by the coupling between the MPP and the acoustical modes in the back cavity. In particular, grazing modes can be induced in the cavity by sound with an oblique angle of incidence, which may result in peak sound absorptions at the natural frequencies of the modes. The mechanism involved is used to explain the absorption properties of the MPP absorber for a diffuse incidence of sound. © 2013 Acoustical Society of America.

    AB - In this paper, a theoretical model of a micro-perforated panel (MPP) backed by a finite cavity and flush-mounted in an infinite baffle is developed and its performance in terms of sound absorption is analyzed. The model allows an oblique incidence sound impinging upon the MPP absorber. The simplified Rayleigh integral method, thin plate theory and the acoustical impedance of the MPP are used to calculate the sound energy absorbed by the MPP's surface. Results show that the absorption coefficient of the absorber is a function of angle and frequency of the incident sound, and is controlled by the coupling between the MPP and the acoustical modes in the back cavity. In particular, grazing modes can be induced in the cavity by sound with an oblique angle of incidence, which may result in peak sound absorptions at the natural frequencies of the modes. The mechanism involved is used to explain the absorption properties of the MPP absorber for a diffuse incidence of sound. © 2013 Acoustical Society of America.

    U2 - 10.1121/1.4768869

    DO - 10.1121/1.4768869

    M3 - Article

    VL - 133

    SP - 201

    EP - 209

    JO - Journal of Acoustical Society of America

    JF - Journal of Acoustical Society of America

    SN - 0001-4966

    IS - 1

    ER -