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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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Abstract

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
Authors:
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
Date:2017
Journal or Publication Title:24th International Congress on Sound and Vibration (ICSV24)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
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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