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Classification of the mid-frequency range based on spatial Fourier decomposition of operational deflection shapes

Biedermann, Jörn and Winter, René and Norambuena Gonzalez, Marco and Böswald, Marc (2017) Classification of the mid-frequency range based on spatial Fourier decomposition of operational deflection shapes. In: 24th International Congress on Sound and Vibration (ICSV24). 24th International Congress on Sound and Vibration (ICSV24), 23.-27. Jul. 2017, London, Großbritannien.

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Aircraft structures are characterized by their lightweight design. As such, they are prone to vi- brations. On numerical side there are several tools suitable for the response analysis of dynamic structures. Each numerical tool is more adequate for different frequency ranges. The Finite El- ement Method, for example, is the state-of-the-art numerical tool for the low-frequency range where modal density is still low and methods based on the modal approach are still appropriate. For the high-frequency range, the Statistical Energy Analysis is more adequate. This method anal- yses the energy transmission between substructures and requires high modal density of the sub- structures. The intermediate section between low- and high-frequency is called the mid-frequency range and is characterized by strong interaction of vibrations and acoustics. The mid-frequency range typically suffers from a lack of tools available. Improvement of tools for the mid-frequency range is highly important e.g. for predicting the acoustic comfort inside an aircraft cabin, where interaction between vibrations and acoustics can be observed. However, as a prerequisite it is nec- essary to determine the beginning and the end of the mid-frequency range. This paper addresses a new method to be applied in acoustic comfort analysis of aircraft fuselage. It utilizes dynamic response measurements conducted on an aircraft fuselage, i.e. a stiffened cylindrical shell which exhibits global and local dynamic behaviour in the mid-frequency range. Existing criteria for the determination of the mid-frequency range are reviewed, but fail in this specific application. Therefore, a new method for the classification of the mid-frequency range for a stiffened cylindri- cal shell test-structure is proposed in this paper. It is based on wavenumber spectra obtained from spatial Fourier decomposition applied to operational deflection shapes extracted from experimen- tal dynamic responses. Analysing the response characteristics of the different components of the aircraft fuselage a classification of frequency ranges is possible.

Item URL in elib:https://elib.dlr.de/113827/
Document Type:Conference or Workshop Item (Speech)
Title:Classification of the mid-frequency range based on spatial Fourier decomposition of operational deflection shapes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Biedermann, Jörnjoern.biedermann (at) dlr.deUNSPECIFIED
Winter, Renérene.winter (at) dlr.deUNSPECIFIED
Norambuena Gonzalez, Marcomarco.norambuena (at) dlr.deUNSPECIFIED
Böswald, Marcmarc.boeswald (at) dlr.deUNSPECIFIED
Journal or Publication Title:24th International Congress on Sound and Vibration (ICSV24)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:vibration analysis of the dynamic behaviour of lightweight aircraft structures, wavenumber analysis , mid-frequency range, high spatial resolution measurements
Event Title:24th International Congress on Sound and Vibration (ICSV24)
Event Location:London, Großbritannien
Event Type:international Conference
Event Dates:23.-27. Jul. 2017
Organizer:The International Institute of Acoustics and Vibration (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 - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Grischke, Birgid
Deposited On:25 Sep 2017 09:01
Last Modified:09 Feb 2018 11:33

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