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Wednesday, July 10 • 17:30 - 17:50
FULL-SCALE CABIN NOISE FROM TURBULENT BOUNDARY LAYER EXCITATION, PART 2: VIBRO-ACOUSTIC MODELLING AND TRANSMISSION

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This paper is part of a two-fold study focused on the study of the cabin noise of a commercial jet conducted within the frame of the Canoble project of the EU's CleansSky2 program. The turbulent boundary layer developing on the fuselage is characterized by the wall pressure fluctuations that cre-ate an excitation that is transmitted and radiated inside the cabin, thereby contributing to a significant part of the noise during cruise. Many studies have looked into the properties and structures of wall pressure fluctuations beneath a turbulent boundary layer, nevertheless there is still a lack of knowledge of some of their components and of the effect of pressure gradients, even more on real geometries. This paper is focused on the implementation and validation of a numerical method to calculate structural vibrations and noise based on aerodynamic data from CFD simulations and from experimental data. The modelling strategy is first described. It involves a coupling between a hybrid structural/acoustic FEM model and a cross and auto power wall pressure spectra source generator. The source model includes heterogeneous boundary layer profiles and is fitted with experimental data conducted in a channel flow in the anechoic wind tunnel of Ecole Centrale de Lyon that served as a validation case. An application of the method with vibration and acoustics experimental data is per-formed at full-scale on a mockup of the fore part of a Dassault Aviation private jet in an industrial-size wind tunnel going up to Mach 0.2 and 10 kHz.

Moderators
ST

Stephan Tewes

Interior Noise Integration & Vibration, Airbus Operations GmbH

Authors

Wednesday July 10, 2019 17:30 - 17:50 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., SS04 Aircr cabin noise & vibr cntrl