Memorias de investigación
Ponencias en congresos:
The reproduction of the response of an aircraft panel to turbulent boundary layer excitation in laboratory conditions
Año:2010
Áreas de investigación
  • Construccion
Datos
Descripción
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.
Internacional
Si
Nombre congreso
20th International Congress on Acoustics, ICA 2010
Tipo de participación
960
Lugar del congreso
Sidney, Australia
Revisores
Si
ISBN o ISSN
978-0-646-54052-8
DOI
Fecha inicio congreso
23/08/2010
Fecha fin congreso
27/08/2010
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Título de las actas
Proceedings of 20th International Congress on Acoustics, ICA 2010
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Acústica Arquitectónica