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In-flight validation of aero-vibro-acoustical excitation models

Haxter, Stefan and Spehr, Carsten (2018) In-flight validation of aero-vibro-acoustical excitation models. 4th JSME RC277, 13.-14. Dez. 2018, Sendai, Japan.

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Official URL: https://www.jsme.or.jp/english/

Abstract

Coherence lengths of the turbulent boundary layer pressure fluctuations were measured in flight on the A320 "ATRA" test carrier. A 3-window array was used in order to characterize the pressure fluctuations. The problem of an unknown flow direction was approached by utilizing the two-dimensional sensor distribution and a 2D fitting method rather than a 1D fitting method. Using the analysis, both, lateral coherence length, longitudinal coherence length, and local flow angle were measured. The coherence lengths were compared to model predictions and the importance of taking the flow angle into account was confirmed. The turbulent boundary layer pressure fluctuations in the aft section and in the front section were transformed in the wavenumber domain. Effects of the point spread function were removed using DAMAS2.1. The resulting source maps were wavenumber filtered and the separated spectra of hydrodynamic and acoustic surface pressure fluctuations were determined for the front- and the aft section.

Item URL in elib:https://elib.dlr.de/126591/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Nur Vortrag
Title:In-flight validation of aero-vibro-acoustical excitation models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haxter, StefanStefan.Haxter (at) dlr.deUNSPECIFIED
Spehr, Carstencarsten.spehr (at) dlr.deUNSPECIFIED
Date:December 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Flight Test, Coherence length, Acoustic, Cabin noise, Separation of Spectra
Event Title:4th JSME RC277
Event Location:Sendai, Japan
Event Type:international Conference
Event Dates:13.-14. Dez. 2018
Organizer:The Japan Society of Mechanical Engineers
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
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
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:04 Mar 2019 03:01
Last Modified:04 Mar 2019 03:01

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