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Modal filters for in-duct sound based on the cremer impedance and micro-perforated plates
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2016 (English)In: Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, German Acoustical Society (DEGA) , 2016, 3215-3222 p.Conference paper (Refereed)
Abstract [en]

The design of a new filter-type is presented that allows a sufficient reduction of in-duct aero-acoustic noise. The filter is a hybrid design containing a lined duct section based on the so called Cremer impedance and a section with combinations of micro-perforated plates. The Cremer impedance section strongly damps the zero-order or plane wave mode while the MPP section which breaks the circumferential symmetry of the duct and damps the higher order modes. Different designs are investigated numerically, solving the linearized Navier-Stokes equations in the frequency domain and decomposing the sound-field into its modal components. Both, the transmission loss and the total power loss is calculated and compared for different assemblies and plate impedances.

Place, publisher, year, edition, pages
German Acoustical Society (DEGA) , 2016. 3215-3222 p.
Keyword [en]
Acoustic fields, Acoustic impedance, Acoustic noise, Acoustic variables control, Acoustics, Aeroacoustics, Bandpass filters, Ducts, Frequency domain analysis, Perforated plates, Frequency domains, Higher-order modes, Hybrid design, Linearized navier-stokes equations, Lined ducts, Modal filters, Total power, Transmission loss, Navier Stokes equations
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-202171ScopusID: 2-s2.0-84994654224OAI: oai:DiVA.org:kth-202171DiVA: diva2:1079261
Conference
45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016, 21 August 2016 through 24 August 2016
Note

QC 20170308

Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-03-08Bibliographically approved

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Scopushttp://www.internoise2016.org/

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
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Output format
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  • asciidoc
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