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Coupled structural-acoustic analytical models for the prediction of turbulent boundary-layer-induced noise in aircraft cabins

Significant interior noise and vibrations in aircraft cabins are generated by the
turbulent flow over the fuselage. The turbulent boundary layer (TBL) excitation is
the most important noise source for jet powered aircraft during cruise flight. Reduced
levels of interior noise are desirable both for comfort and health reasons. However,
to efficiently design noise control systems, and to design new and optimized structures
that are more efficient in the noise reduction, a clearer understanding of the
sound radiation and transmission mechanisms is crucial. This task is far from being
straightforward, mainly due to the complexity of the system consisted by the aircraft
fuselage, and all the sound transmission mechanisms involved in a such complex environment.
The present work aims to give a contribution for the understanding of
these mechanisms. For that, a coupled aero-vibro-acoustic analytical model for the
prediction of the TBL-induced noise and vibration in aircraft is developed. Closed
form analytical expressions are obtained to predict the structural vibration levels,
noise radiated from the structure and interior sound pressure levels. / Graduate

Identiferoai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/6834
Date24 November 2015
CreatorsRocha, Joana Luiz Torres da
ContributorsSuleman, Afzal, Lau, Fernando
Source SetsUniversity of Victoria
LanguageEnglish, English
Detected LanguageEnglish
TypeThesis
RightsAvailable to the World Wide Web

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