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Numerical estimation of the absorption coefficient of flexible micro-perforated plates in an impedance tube
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-3609-3005
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2016 (English)In: ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, International Institute of Acoustics and Vibrations , 2016Conference paper (Refereed)
Abstract [en]

In this study, we numerically model a vibro-acoustic system consisting of a flexible micro-perforated plate (f-MPP) and an acoustic medium. Combined with a back-cavity, micro-perforated plates are considered as a promising noise control technology due to their tunable, wide-band sound absorption characteristics and robust performance. An MPP consists of a plate with uniformly distributed perforations whose diameters are in the order of a millimeter. These perforations are small enough to dissipate the acoustic perturbations due to the viscous effects caused by the presence of the Stokes layers. When the plate is rigid, the sound dissipation mechanism for a specific frequency bandwidth is determined by the perforation diameter, plate thickness, plate porosity and the back cavity depth. Yet, when the plate is flexible, additional absorption peaks, which cannot be determined by the parameters mentioned before, are observed in the measurements. This phenomenon is due to the vibro-acoustic coupling of the flexible plate and the acoustic medium. To model the vibro-acoustic system numerically, we couple two 3D cylindrical acoustic mediums, i.e. incident and back cavity regions, with a flexible plate consisting of shell elements. The perforations are separately located on the plate as independent transfer admittance elements with impedance values obtained from existing models. The system is disturbed with a plane wave excitation and the assessment of the model is done by comparing the calculated absorption coefficient with the experimental results from the literature. In the future, we plan to investigate the effect of perforation positions with the help of the model built in this study.

Place, publisher, year, edition, pages
International Institute of Acoustics and Vibrations , 2016.
Keyword [en]
Acoustic devices, Acoustic fields, Acoustic impedance, Acoustic wave absorption, Acoustic wave propagation, Sound insulating materials, Absorption co-efficient, Acoustic perturbations, Dissipation mechanism, Noise control technology, Numerical estimation, Sound absorption characteristic, Vibro-acoustic couplings, Vibro-acoustic systems, Perforated plates
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194594ScopusID: 2-s2.0-84987926905ISBN: 9789609922623OAI: diva2:1044144
23rd International Congress on Sound and Vibration, ICSV 2016, 10 July 2016 through 14 July 2016

Funding Details: FP7-PEOPLE-ITN-2012, EC, European Commission. QC 20161102

Available from: 2016-11-02 Created: 2016-10-31 Last updated: 2016-11-02Bibliographically approved

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