Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Jet noise modelling for shielding calculations using RANS solution source localisation and WEM propagation
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland.ORCID-id: 0000-0003-0176-5358
Trinity College Dublin, Department of Mechanical and Manufacturing Engineering, Ireland.
2006 (engelsk)Inngår i: 22nd International Conference on Noise and Vibration Engineering, ISMA, Leuven University Press, 2006, s. 667-676Konferansepaper, Publicerat paper (Annet vitenskapelig)
Abstract [en]

In this paper, a method to determine the jet noise source input for shielding calculations is described. The method involves three steps - localisation, propagation and simplification. Firstly, for the frequency of interest, a small localised source region is determined, using Goldstein-Rosenbaum's acoustic model, with a numerical RANS solution providing local flow properties. A number of distinct incoherent noise sources may be located in this region, using the turbulence length scales. In the second step, each source is propagated out through the jet flow using the wave expansion method (WEM) to solve the Helmholtz equation, with local Mach values acquired from the RANS solution. The third step is to define a Kirchhoff surface outside the jet flow, from which the sound may be propagated further by simply using the Helmholtz-Kirchhoff integral, which can account for any mean flow present. Although the method is quite crude, it is relatively robust as it is a shielding factor or ratio, rather than an absolute value, which is of interest in design evaluation. Preliminary results, presented in this paper, provide encouragement that this new three-step jet noise source modelling method can be used to provide a source input for use in airframe shielding calculations, that is equivalent - in terms of source frequency, distribution and directivity - to the noise produced by a jet flow.

sted, utgiver, år, opplag, sider
Leuven University Press, 2006. s. 667-676
Emneord [en]
Acoustic noise measurement, Navier Stokes equations, Shielding, Design evaluation, Incoherent noise, Modelling method, Shielding calculation, Shielding factor, Source frequency, Source localisation, Wave expansion methods
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-159532ISI: 000246669501007Scopus ID: 2-s2.0-84897088514ISBN: 978-90-73802-83-4 (tryckt)OAI: oai:DiVA.org:kth-159532DiVA, id: diva2:785478
Konferanse
International Conference on Noise and Vibration Engineering 2006, ISMA 2006, Heverlee, Belgium, 18 September 2006 through 20 September 2006
Merknad

QC 20150706

Tilgjengelig fra: 2015-02-03 Laget: 2015-02-03 Sist oppdatert: 2016-08-22bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Scopus

Personposter BETA

O'Reilly, Ciarán J.

Søk i DiVA

Av forfatter/redaktør
O'Reilly, Ciarán J.

Søk utenfor DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 123 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf