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Energy based correlation criteria in the mid-frequency range

Biedermann, Jörn and Winter, René and Wandel, Martin and Böswald, Marc (2017) Energy based correlation criteria in the mid-frequency range. Journal of Sound and Vibration, 400, pp. 457-480. Elsevier. DOI: 10.1016/j.jsv.2017.04.024 ISSN 0022-460X

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Abstract

Aircraft structures are characterized by their lightweight design. As such, they are prone to vibrations. Numerical models based on the Finite Element Method often show significant deviations when the mid-frequency range is considered, where strong interaction be- tween vibrations and acoustics is present. Model validation based on experimental modal data is often not possible due to the high modal density that aircraft fuselage structures exhibit in this frequency range. Classical correlation criteria like the Modal Assurance Criterion require mode shapes and can therefore not be applied. Other correlation criteria using frequency response data, such as the Frequency Domain Assurance Criterion, are highly sensitive to even small structural modifications and fail to indicated the correlation between test and analysis data in the mid-frequency range. Nevertheless, validated nu- merical models for the mid- to high-frequency ranges are a prerequisite for acoustic comfort predictions of aircraft cabin. This paper presents a new method for the correlation of response data from test and analysis in the mid-frequency range to support model validation in the mid-frequency range and to enable the usage of finite element models in this frequency range. The method is validated on a stiffened cylindrical shell structure, which represents a scale-model of an aircraft fuselage. The correlation criterion presented here is inspired by Statistical Energy Analysis and is based on kinetic energies integrated over frequency bands and spatially integrated over surface areas of the structure. The objective is to indicate frequency bands where the finite element model needs to be adjusted to better match with experimental observations and to locate the areas where these adjustments should be applied.

Item URL in elib:https://elib.dlr.de/113571/
Document Type:Article
Title:Energy based correlation criteria in the mid-frequency range
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Biedermann, Jörnjoern.biedermann (at) dlr.deUNSPECIFIED
Winter, Renérene.winter (at) dlr.deUNSPECIFIED
Wandel, Martinmartin.wandel (at) airbus.comUNSPECIFIED
Böswald, Marcmarc.boeswald (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:400
DOI :10.1016/j.jsv.2017.04.024
Page Range:pp. 457-480
Publisher:Elsevier
ISSN:0022-460X
Status:Published
Keywords:structural dynamics, vibroacoustics, numerical & experimental model correlation, kinetic energy distribution, mid-, high-frequency range, high spatial resolution measurements, model validation, model updating
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 08:56
Last Modified:25 Sep 2017 08:56

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