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Finite Element Method and Dynamical Energy Analysis in Vibroacoustics - A Comparative Study

Zettel, Sebastian Florens and Winter, Rene and Norambuena, Marco and Böswald, Marc and Richter, Martin and Tanner, Gregor (2021) Finite Element Method and Dynamical Energy Analysis in Vibroacoustics - A Comparative Study. In: 50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021, pp. 1-11. InterNoise 2021, 1.-5. Aug. 2021, Washington D.C. (virtuell). ISBN 978-173259865-2.

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Future aircraft concepts utilizing innovative lightweight structures and novel propulsion concepts are a necessity for long term sustainable air travel. While the development is mainly driven by lightweight design and fuel-efficient propulsion, these concepts may pose new challenges for the vibroacoustic analysis of cabin structures and the associated noise impact on passengers. Finite Element (FE) models derived from aircraft pre-design data are not optimized for use in acoustic analyses, i.e. the mesh typically is too coarse to provide meaningful results. At the same time, setting up Statistical Energy Analysis models for this specific purpose is adding another time-consuming step. An alternative possibly exists in the Dynamical Energy Analysis (DEA). This method allows to calculate the acoustic behavior of thin-walled structures in higher frequency ranges simply using existing FE meshes. In this paper an experimental lightweight aluminum structure and its respective FE model is investigated for a frequency range up to 5000 Hz. A comparison in terms of vibrational energy between DEA, FEM and measurement results is presented. Finally, a lower-bound frequency range is identified in which DEA and FEM correlate and thus allow a substitution for further simulations at higher frequencies. To ensure the transferability of the results to structures of other dimensions and materials, frequency scale factors based on analytical equations are derived.

Item URL in elib:https://elib.dlr.de/144699/
Document Type:Conference or Workshop Item (Speech)
Title:Finite Element Method and Dynamical Energy Analysis in Vibroacoustics - A Comparative Study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zettel, Sebastian FlorensSebastian.Zettel (at) dlr.deUNSPECIFIED
Winter, ReneRene.Winter (at) dlr.deUNSPECIFIED
Norambuena, MarcoMarco.Norambuena (at) dlr.deUNSPECIFIED
Böswald, MarcMarc.Boeswald (at) dlr.deUNSPECIFIED
Richter, MartinMartin.Richter (at) nottingham.ac.ukUNSPECIFIED
Tanner, GregorGregor.Tanner (at) nottingham.ac.ukUNSPECIFIED
Date:August 2021
Journal or Publication Title:50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-11
Keywords:Vibroacoustics, FEM, Dynamical Energy Analysis, Energy Correlation Criterion, Numerical, Experimental
Event Title:InterNoise 2021
Event Location:Washington D.C. (virtuell)
Event Type:international Conference
Event Dates:1.-5. Aug. 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Structural Dynamics and System Identification
Deposited By: Zettel, Sebastian Florens
Deposited On:01 Nov 2021 15:53
Last Modified:15 Mar 2022 14:46

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