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Broadband Shock-cell Noise Signature Identification Using a Wavelet-based Method

Gefen, Lior and Pérez Arroyo, Carlos and Camussi, Roberto and Puigt, Guillaume and Airiau, Christophe Broadband Shock-cell Noise Signature Identification Using a Wavelet-based Method. (2016) In: 22nd AIAA/CEAS Aeroacoustics Conference, 30 May 2016 - 1 June 2016 (Lyon, France).

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Official URL: http://dx.doi.org/10.2514/6.2016-2732

Abstract

Civil and military aircraft manufacturers need to respond to increasingly more restrictive standards about noise emission. In order to fulfil those requirements the mechanisms underlying the noise production need to be understood. The supersonic jets at the exit of aircraft engines are known to contain several sources of noise, namely: screech (military air-crafts), Broadband Shock–cell Associated Noise (BBSAN) and large–scale structures. The current work is focused on the study of BBSAN by means of a wavelet–based technique. The technique was applied to a pressure nearfield line array for the sake of extracting the signatures’ related to noise production mechanisms. Each ’signature’ characterized by its shape and time–scale. The signature found up to approximatively x/D = 6D has a ’wave–packet’ like shape. The same shape is obtained at farfield locations for forward angles. The Sound Pressure Level (SPL) was computed using the nearfield signatures and it is in good agreement with the SPL computed using the pressure signals. The ’wave–packet’ like shape ’signature’ is associated to BBSAN as it has the same characteristics: same SPL and forward angles directivity.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Institut national des sciences de l'Univers - INSU (FRANCE)
Other partners > Università degli Studi Roma Tre (ITALY)
Laboratory name:
Funders:
Marie Curie Initial Training Networks (ITN) FP7-PEOPLE-2012-ITN
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Deposited On:25 Mar 2019 11:10

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