Lafronza, L., McAlpine, A., Keane, A.J. and Astley, R.J.
Computer-aided liner optimization for broadband noise
At 10th AIAA/CEAS Aeroacoustics Conference.
10 - 12 May 2004.
In this article the attenuation of brodband noise in an accoustically-lined circular-section dut is investigated. The aim is to predict how an axially segmented liner influences the attenuation of braodband noise in an aero-engine intake. The sound field is modelled using a multi-modal representation, assuming an ensemble of uncorrelated modes over a wide range of frequencies. An optimization procedure based on a Response Surface Model is used to investigate the optimum uniform and axially-segmented acoustic liner that maximizes the attenuation of braodband noise. An approximate calculation of the Perceived Noise level (PNL) is used for the objective function. In this arcticle the benefit of using an axially segmented liner instead of a uniform liner to attenuate broadband noise is demonstrated.
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