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Measurement, simulation and synthesis of turbulent-boundary-layer-induced vibrations of panel structures

Misol, Malte and Algermissen, Stephan and Hu, Nan and Monner, Hans Peter (2016) Measurement, simulation and synthesis of turbulent-boundary-layer-induced vibrations of panel structures. In: Proceedings of the 23rd International Congress on Sound and Vibration. International Institute of Acoustics and Vibration (IIAV). 23rd International Congress on Sound and Vibration, 10.-14.07.2016, Athen, Griechenland. ISBN 978-960-99226-2-3 ISSN 2329-3675

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Abstract

The characterization of the vibro-acoustic behavior of structures excited by a turbulent boundary layer (TBL) is an expensive task and thus raises the demand for less expensive alternative solu-tions. This contribution focuses on the synthesis of TBL-typical structural vibration by means of a loudspeaker array placed in front of a panel structure. The derived method can be applied to any flat or curved panel structure (e. g. an aircraft fuselage section). The work is subdivided into three main parts. Firstly, experiments in an aero-acoustic wind tunnel are performed to capture the characteristics of the TBL excitation and the induced vibrations of a rectangular aluminum plate. Secondly, a finite element model of the plate and a statistical excitation model are derived and validated with measurement data. Despite the use of simple simulation models, a high agreement between measurement and simulation is achieved. It is concluded that realistic values for the vibrations of panel structures can be derived. In the third part of this work, the aluminum plate is mounted in the test opening of a transmission loss facility. A loudspeaker array located in the reverberant sending room of the facility is placed in front of the panel and the frequency response functions (FRFs) from the loudspeaker array to the structural vibration of the plate are derived. The structural vibration is measured with a scanning laser Doppler vibrometer placed in the semi-anechoic receiving room of the facility. The filtering of the simulated target values through the inverse FRFs yields the required control signals for the loudspeaker array. Twelve loudspeakers, corresponding to 60 loudspeakers per square meter, are used to synthesize the TBL-induced structural vibration up to 500 Hz. The synthesized structural vibration is consistent with the target values obtained from simulation.

Item URL in elib:https://elib.dlr.de/105844/
Document Type:Conference or Workshop Item (Speech)
Title:Measurement, simulation and synthesis of turbulent-boundary-layer-induced vibrations of panel structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Misol, MalteMalte.Misol (at) dlr.dehttps://orcid.org/0000-0001-8056-1569
Algermissen, StephanStephan.Algermissen (at) dlr.deUNSPECIFIED
Hu, NanNan.Hu (at) dlr.deUNSPECIFIED
Monner, Hans PeterHans.Monner (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Proceedings of the 23rd International Congress on Sound and Vibration
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Vogiatzis, KonstantinosUniversity of Thessaly
Kouroussis, GeorgesUniversite de Mons
Crocker, MalcolmIIAV
Pawelczyk, MarekSilesian University of Technology
Publisher:International Institute of Acoustics and Vibration (IIAV)
ISSN:2329-3675
ISBN:978-960-99226-2-3
Status:Published
Keywords:turbulent boundary layer (TBL), synthesis, loudspeaker, vibration, measurement, simulation
Event Title:23rd International Congress on Sound and Vibration
Event Location:Athen, Griechenland
Event Type:international Conference
Event Dates:10.-14.07.2016
Organizer:IIAV
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, L - Structures and Materials, L - Systems and Cabin, V - NGC Fahrzeugstruktur (old), R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Misol, Dr. Malte
Deposited On:29 Aug 2016 10:22
Last Modified:31 Jul 2019 20:03

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