Change search
ReferencesLink to record
Permanent link

Direct link
Non-linear acoustic transfer impedance of micro-perforated plates with circular orifices
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Eindhoven Univ Technol, Netherlands.ORCID iD: 0000-0002-3609-3005
2016 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 366, 418-428 p.Article in journal (Refereed) PublishedText
Abstract [en]

A practical description of the transitional behavior of micro -perforated plates (MPPs) is provided between the linear and strongly non-linear regimes. Micro -perforated plates are efficient sound absorbers whose application areas vary from room acoustics to duct acoustics. Although there are accurate models for the linear and strongly non-linear acoustic behavior of MPPs, the transition from one to another has not been a focus of interest so far. A series of measurements are performed with MPP samples for various excitation amplitudes. The deviation from the linear impedance is found to be a function of excitation amplitude and oscillating viscous boundary layer thickness, expressed in terms of the Strouhal number and the Shear number. Typical for MPPs is a Shear number of order unity, implying that the viscous boundary layer thickness is in the order of the perforation radius. Using the measurement data, expressions are proposed for calculating the non-linear acoustic resistance and reactance for circular perforations with sharp square edges. Some additional data is provided for the higher Shear number range. The behavior at low amplitudes for high Shear numbers deviates strongly from the typical MPP behavior. This is due to local vortex shedding at the sharp edges of the perforation.

Place, publisher, year, edition, pages
Academic Press, 2016. Vol. 366, 418-428 p.
Keyword [en]
Acoustic Transfer Impedance, Micro-Perforated Plates, Non-Linear Acoustics, Impedance Tube Measurements, Transition Regime
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-182139DOI: 10.1016/j.jsv.2015.12.022ISI: 000368560800022ScopusID: 2-s2.0-84957443049OAI: oai:DiVA.org:kth-182139DiVA: diva2:904979
Note

QC 20160220

Available from: 2016-02-20 Created: 2016-02-16 Last updated: 2016-02-20Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Arteaga, Ines Lopez
By organisation
Aeronautical and Vehicle Engineering
In the same journal
Journal of Sound and Vibration
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 26 hits
ReferencesLink to record
Permanent link

Direct link