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Development of micro-perforated acoustic elements for vehicle applications
Ørsted, DTU, Acoustic Technology, Technical University of Denmark.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2005 (English)In: 12th International Congress on Sound and Vibration 2005: ICSV 2005, 2005, 2343-2350 p.Conference paper (Refereed)
Abstract [en]

There is a growing interest in the automotive industry on micro-perforated acoustic elements for reducing noise radiation from engine systems. The traditional means of acoustic attenuation through porous materials has some serious drawbacks (poor efficiency at low frequencies, low capability to withstand flow and thermal conditions commonly encountered in engine systems). Novel elements consisting of holes/slits of sizes of about 10-1 mm are currently investigated. An indicator of paramount importance when designing such elements is the acoustic flow impedance (pressure drop across the sample/acoustic particle velocity). A detailed description of the impedance of these elements is necessary for evaluating the efficiency of reflection of acoustic waves. This is required for reducing the propagation of noise further downstream. A concise fundamental theoretical investigation for optimal design is not possible due to highly complex geometries attributed to micro-perforated patterns. Moreover, mean flow, thermal and non-linear effects come into play for vehicle applications. This paper describes preliminary results from a project investigating the above effects.

Place, publisher, year, edition, pages
2005. 2343-2350 p.
, 12th International Congress on Sound and Vibration 2005, Vol. 3
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-148565ScopusID: 2-s2.0-84881569168ISBN: 978-162748149-6OAI: diva2:736976
12th International Congress on Sound and Vibration 2005, ICSV 2005; Lisbon, Portugal, 11-14 July, 2005

QC 20140811

Available from: 2014-08-11 Created: 2014-08-08 Last updated: 2014-08-11Bibliographically approved

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Ducret, FabriceÅbom, Mats
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