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Frequency and temperature dependent viscoelastic vibration damping capability of a novel local CLD treatment

Gröhlich, Martin and Böswald, Marc and Winter, Rene (2019) Frequency and temperature dependent viscoelastic vibration damping capability of a novel local CLD treatment. International Institute of Noise Control Engineering (I-INCE). INTER-NOISE 2019, 16.-19. Jun. 2019, Madrid, Spanien. ISBN 978-84-87985-31-7 ISSN 0105-175x

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As lightweight and stiffened structures, aircraft are prone to vibration. Constrained Layer Damping (CLD) treatment is a popular method to increase the vibration damping of such structures. Constrained by a top and bottom layer, the viscoelastic core layer is forced under shear strain and causes a dissipation of vibrational energy. However, the damping behaviour of viscoelastic materials is highly dependent on frequency and temperature, and has to be considered during the design process. In this paper, the influence of frequency and temperature on the damping behaviour of bromobutyl rubber is presented. The material is modelled by a generalized Maxwell model, which can be implemented in finite element (FE) calculations for damping layout. Additionally, a novel setup for local CLD treatment is introduced, causing higher shear strain in the core layer. The damping results are compared to those of different damping treatments. Finally, the impact of bromobutyl rubber on the damping capability of the local CLD treatment is examined for various excitation frequencies and temperature levels.

Item URL in elib:https://elib.dlr.de/128000/
Document Type:Conference or Workshop Item (Speech)
Title:Frequency and temperature dependent viscoelastic vibration damping capability of a novel local CLD treatment
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gröhlich, MartinMartin.Groehlich (at) dlr.deUNSPECIFIED
Böswald, MarcMarc.Boeswald (at) dlr.deUNSPECIFIED
Winter, ReneRene.Winter (at) dlr.deUNSPECIFIED
Date:June 2019
Refereed publication:Yes
Gold Open Access:No
In ISI Web of Science:No
Publisher:International Institute of Noise Control Engineering (I-INCE)
Keywords:viscoelasticity, vibration damping, damping layout
Event Title:INTER-NOISE 2019
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:16.-19. Jun. 2019
Organizer:SEA - The Spanish Acoustical Society / I-INCE - International Institute of Noise Control Engineering I-INCE
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: Gröhlich, Martin
Deposited On:09 Jul 2019 09:11
Last Modified:09 Jul 2019 09:11

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