THE INSERTION LOSS OF POROELASTIC PLATE SILENCERS IN A FLOW DUCT

Haydar Aygun

    Research output: Chapter in Book/Report/Published conference proceedingConference contributionpeer-review

    Abstract

    Idealized silencers consisting of cavity-backed clamped porous elastic plates parallel to the direction of flow can result in low frequency attenuation of noise in the duct. The insertion loss of perforated and non-perforated poroelastic plate silencers have been measured with and without mean air flow. Peak IL when the plate is not perforated has a value of 4.1 dB at 1 kHz without air flow. With perforations the peak IL is 3.2 dB at 630 Hz. In the presence of mean air flow, without self-noise, peak IL have values of 17 dB at 250 Hz and 7 dB at 400 Hz for the air flow speeds of 37.65 m/s and 5.5 m/s respectively. Peak IL of perforated and non perforated porous plate has values of 11 dB and 11.5 dB at 160 Hz with noise and air flow at speed of 37.65 m/s. The displacements of a perforated and non-perforated porous elastic plates separated from duct wall by an air cavity in the duct have been measured and compared with those of the duct wall.
    Original languageEnglish
    Title of host publicationSpring Conference of the Institute of Acoustics, April 10 - 11, 2008, Reading UK
    Publication statusPublished - 1 Apr 2008

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