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Full Scale: Flight Test Characterization of Aircraft Fuselage Surface Pressure Fluctuations

Haxter, Stefan and Spehr, Carsten (2017) Full Scale: Flight Test Characterization of Aircraft Fuselage Surface Pressure Fluctuations. Internoise 2017, 27.-30. Aug. 2017, Hong Kong, China.

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In flight testing there are a Jot of noise sources present and each of them possibly contributes to cabin noise. One major source is the jet engine with its narrow band fan noise and its broadband jet noise. The other major source contributing to ca bin noise are pressure fluctuations from turbulent boundary layer. On the surface of the fuselage pressure fluctuations from both sources are present simultaneously and they cannot be separated using a single microphone. In order to distinguish between the major pressure fluctuations present, the different propagation speeds between acoustic and hydrodynamic pressure fluctuations have to be evaluated using an array of transducers mounted on the surface. In the investigation presented, representative measurements from a flight test will be shown where both, the acoustic and the hydrodynamic pressure fluctuations are present. The different propagation mechanisms will be identified by means of speed and by means of characteristic appearance. An attempt to separate the pressure power provided by each of the two separate propagation mechanisms will be made. With the use of such tools, the identification and qualification of different possible sources responsible for surface excitation is possible. This information can be used for prediction of cabin noise using simplified structural models. The use of the tools is not limited to aircraft use, but has been successfully implemented on various types of transportation, such as trains and cars.

Item URL in elib:https://elib.dlr.de/118604/
Document Type:Conference or Workshop Item (Speech)
Additional Information:T3.2; Paper 157; P6167-6178; USB-Stick
Title:Full Scale: Flight Test Characterization of Aircraft Fuselage Surface Pressure Fluctuations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Flight test, Wavenumber Analysis
Event Title:Internoise 2017
Event Location:Hong Kong, China
Event Type:international Conference
Event Dates:27.-30. Aug. 2017
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 - Simulation and Validation (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Bachmann, Barbara
Deposited On:31 Jan 2018 11:38
Last Modified:16 Feb 2018 10:55

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