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Acoustic multi-ports with application to duct acoustics
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7898-8643
2010 (English)In: 17th International Congress on Sound and Vibration 2010, ICSV 2010: Volume 5, 2010, 3930-3942 p.Conference paper (Refereed)
Abstract [en]

In this paper the development of multi-port models to describe linear acoustic problems in ducts with flow is presented. From an engineering point of view this field covers many important applications ranging from ventilation ducts in vehicles or buildings to intake/exhaust ducts on ICengines and power plants. Historically the use of multi-port models for ducts started in the 1920's, when the four-pole (2-port) filter models used by electrical engineers were applied to analyse transmission of low frequency 1D (plane) waves with application to automotive mufflers. An important step was then taken in 1971, when Cremer presented the idea that such "black box" models can be applied to describe aerodynamically generated sound in ducts. This implies that any fluid machine or unsteady flow process can be modelled as a "black box", with a "passive part" that describes how incident waves are scattered and an "active part" that describes the sound generation. The active part is normally assumed independent of the acoustic state, which makes the "black box" or acoustic multi-port model consistent with Lighthills acoustic analogy.

Place, publisher, year, edition, pages
2010. 3930-3942 p.
Keyword [en]
Acoustic analogy, Active parts, Black boxes, Duct acoustics, Electrical engineers, Filter model, Fluid machines, In-vehicle, Incident waves, Linear acoustic problems, Multi-port, Sound generation
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-86938ScopusID: 2-s2.0-84871417022ISBN: 978-161782255-1OAI: diva2:501193
17th International Congress on Sound and Vibration 2010, ICSV 2010; Cairo; Egypt; 18 July 2010 through 22 July 2010

QC 20120423. Distinguished Keynote paper.

Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2014-08-14Bibliographically approved

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Åbom, Mats
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Marcus Wallenberg Laboratory MWLLinné Flow Center, FLOW
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