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Fuselage Excitation During Cruise Flight Conditions: Measurement and Prediction of Pressure Point Spectra

Klabes, Alexander and Appel, Christina and Herr, Michaela and Bouhaj, Mohamed (2015) Fuselage Excitation During Cruise Flight Conditions: Measurement and Prediction of Pressure Point Spectra. AIAA Aviation, 21st AIAA/CEAS Aeroacoustics Conference, 22-26 June 2015, Dallas, Texas, USA.

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Abstract

In the last �fifty years many semi-empirical models to predict surface pressure fluctuations beneath turbulent boundary layers (TBL) have been developed for a large variety of test conditions. Nowadays, the relevance of the TBL as a source of cabin interior noise is steadily increasing, due to quieter aircraft engines. The possibility of predicting surface pressure auto-spectra with the various publicly available semi-empirical models at several positions on the fuselage of DLR's Advanced Technology Research Aircraft (ATRA) is investigated. A large validation database was used, involving in-flight measurements at different flight levels (FL) and Mach numbers, applying two different sensor types. Predictions were performed based on semi-empirically estimated TBL parameters (partly included in the different models) and, additionally, based on TBL properties that were extracted from CFD simulations. This procedure served to identify different sources of error in the prediction. Overall, it is shown that today's models provide a large (> 10 dB) scatter among the predicted spectra. Even the most suitable approaches are not generally applicable to all relevant positions at the fuselage. Particularly in regions with strong pressure gradients and high turbulence kinetic energy measured auto-spectra cannot be reproduced with su�fficient accuracy. This indicates the need for more universally applicable CFD- and CAA-based surface pressure prediction methods.

Item URL in elib:https://elib.dlr.de/97218/
Document Type:Conference or Workshop Item (Speech)
Title:Fuselage Excitation During Cruise Flight Conditions: Measurement and Prediction of Pressure Point Spectra
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klabes, Alexanderalexander.klabes (at) dlr.deUNSPECIFIED
Appel, Christinachristina.appel (at) dlr.deUNSPECIFIED
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Bouhaj, Mohamedmohamed.bouhaj (at) airbus.comUNSPECIFIED
Date:22 June 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:TBL, Fuselage excitation, flight test, ATRA, Airbus, auto-spectra
Event Title:AIAA Aviation, 21st AIAA/CEAS Aeroacoustics Conference
Event Location:Dallas, Texas, USA
Event Type:international Conference
Event Dates:22-26 June 2015
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin, L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Klabes, Alexander
Deposited On:20 Jul 2015 16:10
Last Modified:31 Jul 2019 19:54

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