The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions

Bravo Maria, Teresa and Maury, Cédric (2010). 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.

Description

Title: The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions
Author/s:
  • Bravo Maria, Teresa
  • Maury, Cédric
Item Type: Presentation at Congress or Conference (Article)
Event Title: 20th International Congress on Acoustics, ICA 2010
Event Dates: 23/08/2010 - 27/08/2010
Event Location: Sidney, Australia
Title of Book: Proceedings of 20th International Congress on Acoustics, ICA 2010
Date: 2010
ISBN: 978-0-646-54052-8
Subjects:
Faculty: E.T.S. Arquitectura (UPM)
Department: Física e Instalaciones Aplicadas a la Edificación, al Medio Ambiente y al Urbanismo [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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 loudspeakers.

More information

Item ID: 7930
DC Identifier: http://oa.upm.es/7930/
OAI Identifier: oai:oa.upm.es:7930
Official URL: http://www.acoustics.asn.au/conference_proceedings/ICA2010/
Deposited by: Memoria Investigacion
Deposited on: 15 Jul 2011 10:45
Last Modified: 20 Apr 2016 16:52
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