{"id":553,"date":"2026-09-26T02:10:22","date_gmt":"2026-09-26T01:10:22","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T23:00:00","slug":"phd-inverse-modal-identification-of-free-field-radiated-noise-from-unducted-rotor-stator-stages-from-laboratory-arrays-to-open-fan-flight-tests-centrale-innovation-4cca6","status":"publish","type":"job_listing","link":"https:\/\/africantalents.online\/blog\/poste\/phd-inverse-modal-identification-of-free-field-radiated-noise-from-unducted-rotor-stator-stages-from-laboratory-arrays-to-open-fan-flight-tests-centrale-innovation-4cca6\/","title":{"rendered":"PhD – Inverse modal identification of free-field radiated noise from unducted rotor-stator stages: from laboratory arrays to Open Fan flight tests"},"content":{"rendered":"

Context:<\/span><\/strong><\/p>\n

This postdoctoral position is part of the European project TAKE-OFF (Clean Aviation programme), which is preparing the full-scale flight demonstration of Safran Aircraft Engines\u2019 RISE Open Fan engine on the Airbus A380 flying testbed, with the aim of reducing fuel consumption by 30 % and entering service around 2035. Without a nacelle, the engine noise sources radiate directly into free field. LMFA (\u00c9cole Centrale de Lyon), in collaboration with LVA (INSA Lyon), is in charge of analysing the near-field pressure data acquired in flight by microphones installed on the fuselage, in order to reconstruct the engine noise sources.<\/p>\n

Objective:<\/span><\/strong><\/p>\n

To extend the modal analysis methods developed at LMFA for ducted engines [1] to unducted fans. For the first time, modal analysis will be applied to microphones located in an unconfined medium and to modes radiating under free-field conditions, and design criteria specific to this configuration will be established (spatial sampling, resolution, array-to-rotor distance relative to the array size).<\/p>\n

Description:<\/span><\/strong><\/p>\n

Task 1 \u2013 Model and inverse problem. <\/strong>Build a set of eigenfunctions describing the radiation of an unducted rotor-stator stage (spinning modes weighted by Bessel functions [2], spherical harmonics, etc.) and embed it in a Bayesian inverse approach [1] to estimate the modal amplitudes of tonal and broadband components. Flow and fuselage effects may be accounted for through CAA computations.<\/p>\n

Task 2 \u2013 Validation on the MAMBO database. <\/strong>The developments will be tested on an unducted propeller + stator configuration recently studied at LMFA (MAMBO project), instrumented with three arrays: a half-cylindrical array, a planar array on the side (representative of fuselage instrumentation) and a motorised arc array measuring directivity, which will serve as an independent reference. This study will assess the robustness of the method and define array design criteria.<\/p>\n

Task 3 \u2013 Application to flight tests. <\/strong>The methodology will be applied to the near-field pressure data acquired on the fuselage during the TAKE-OFF flight test campaigns, in order to identify the modal content of the noise radiated by the Open Fan engine and to infer information on its generation mechanisms.<\/p>\n

\n

Starting date : 01\/01\/2027<\/p>\n

<\/p>\n

Profile and application:<\/span><\/strong><\/p>\n

PhD in acoustics, aeroacoustics or signal processing; skills in array methods, inverse problems and\/or modal analysis; scientific programming (Python\/Matlab).<\/p>\n

References:<\/span><\/strong><\/p>\n

[1] Pereira, A. & Jacob, M.C., 2022, Modal analysis of in-duct fan broadband noise via an iterative Bayesian inverse approach, J. Sound Vib.<\/em>, doi:10.1016\/j.jsv.2021.116633.<\/p>\n

[2] Roger, M. & Kucukcoskun, K., 2019, Near-and-far field modeling of advanced tail-rotor noise using source-mode expansions, J. Sound Vib.<\/em>, 453, 328-354.<\/p>\n

\n

LMFA contacts:<\/span><\/strong> Antonio Pereira, Marc Jacob<\/p>\n

LVA contact: <\/span><\/strong>Quentin Lecl\u00e8re (LVA, INSA Lyon)<\/p>\n

Funding: <\/span><\/strong>European project TAKE-OFF (Technology and Knowledge for European Open Fan Flight)<\/p>\n

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