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The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions
Bravo Maria, Teresa and Maury, Cédric
The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions.
In: "20th International Congress on Acoustics, ICA 2010", 23/08/2010 - 27/08/2010, Sidney, Australia. ISBN 978-0-646-54052-8.
||The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions
Bravo Maria, Teresa
Presentation at Congress or Conference
||20th International Congress on Acoustics, ICA 2010
||23/08/2010 - 27/08/2010
|Title of Book:
||Proceedings of 20th International Congress on Acoustics, ICA 2010
||E.T.S. Arquitectura (UPM)
||Física e Instalaciones Aplicadas a la Edificación, al Medio Ambiente y al Urbanismo [hasta 2014]
|Creative Commons Licenses:
||Recognition - No derivative works - Non commercial
One important topic in the aeronautic and aerospace industries is the reproduction of random pressure field, with prescribed spatial correlation characteristics, in laboratory conditions. In particular, the random-wall pressure fluctuations induced by a Turbulent Boundary Layer (TBL) excitation are a major concern for cabin noise problem, as this
excitation has been identified as the dominant contribution in cruise conditions. As in-flight measurements require
costly and time-consuming measurement campaigns, the laboratory reproduction has attracted considerable attention
in recent years. Some work has already been carried out for the laboratory simulation of the excitation pressure field
for several random fields. It has been found that TBL reproduction is very demanding in terms of number of loudspeakers per correlation length, and it should require a dense and non-uniform arrangement of acoustic sources due to
the different spanwise and streamwise correlation lengths involved. The present study addresses the problem of directly simulating the vibroacoustic response of an aircraft skin panel using a near-field array of suitably driven loudspeakers. It is compared with the use of an array of shakers and piezoelectric actuators. It is shown how the
wavenumber filtering capabilities of the panel reduces the number of sources required, thus dramatically enlarging
the frequency range over which the TBL vibro-acoustic response is reproduced with accuracy. Direct reconstruction
of the TBL-induced panel response is found to be feasible over the hydrodynamic coincidence frequency range using
a limited number of actuators driven by optimal signals. It is shown that piezoelectric actuators, which have more
practical implementation than shakers, provide a more effective reproduction of the TBL response than near-field
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