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Communication Dans Un Congrès Année : 2012

Reproduction of random acoustic pressure fields on plane surfaces using wave field synthesis and planar holography

Olivier Robin
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Alain Berry
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Stéphane Moreau
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Rokhiya Dia
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Résumé

Vibroacoustic testing of many panel structures such as building partitions, automotive windscreens or fuselage panels, is often performed in coupled reverberant – anechoic rooms under Diffuse Acoustic Field (DAF) assumption. However, an ideal and repeatable DAF is difficult to reach in practice, especially at low frequencies. Moreover, this measurement does not reflect the actual transmission loss of structural parts of a moving vehicle, subjected to complex wall pressure fluctuations linked to Turbulent Boundary Layer (TBL) excitation developing on its external surface. Measurements under this excitation can be performed using wind tunnels or in-vehicle testing, but such measurements are time consuming, costly and show discrepancies. Two sound field reproduction strategies, Wave Field Synthesis and Planar Holography, are proposed here to perform robust laboratory reproduction of DAF and TBL random pressure fields in 2-D (i.e. sound pressure distribution on a plane surface), which are defined using their cross-spectral densities. Numerical simulations of reproduction frameworks are performed for acoustic monopoles as reproduction sources, distributed on a plane facing a virtual panel to be tested. Synthesis results are then analyzed in both spatial and wavenumber domains. We finally present indications to size a practical application, identify some technical constraints and suggest solutions to overcome them.
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Dates et versions

hal-00810714 , version 1 (23-04-2012)

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  • HAL Id : hal-00810714 , version 1

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Olivier Robin, Alain Berry, Stéphane Moreau, Rokhiya Dia. Reproduction of random acoustic pressure fields on plane surfaces using wave field synthesis and planar holography. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810714⟩

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