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Examination of the vibroacoustic behavior of a grid-stiffened panel with applied passive constrained layer damping

Titze, Maik and Misol, Malte and Monner, Hans Peter (2019) Examination of the vibroacoustic behavior of a grid-stiffened panel with applied passive constrained layer damping. Journal of Sound and Vibration, 453, pp. 174-187. Elsevier. DOI: 10.1016/j.jsv.2019.03.021 ISSN 0022-460X

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Abstract

This paper provides a contribution to the understanding of both the vibroacoustical behavior and the influence of passive constrained layer damping (PCLD) applications on the Sound radiation of a grid-stiffened panel. A test specimen is manufactured and an experimental setup with a synthetic turbulent boundary layer excitation is eveloped. In addition, a numerical model is created and updated with the results of an experimental modal analysis. Further, the acoustic effect of PCLD applied to the ribs and to the skin fields of the grid panel is assessed by measurement of the radiated sound power. It is shown that the ribs are suitable for an efficient application of PCLD. Generally, additional damping of the grid panel is achieved with PCLD for frequencies above 300 Hz. By partially covering the ribs with PCLD, a reduction of the radiated sound power of up to 2 dB in third-octave bands is achieved. In case of a total coverage of the grid panel, a reduction of up to 4 dB in third-octave bands is attained.

Item URL in elib:https://elib.dlr.de/127259/
Document Type:Article
Additional Information:Financial support has been provided by the German Research Foundation (DFG) in the framework of the SFB 880: Fundamentals of High Lift for Future Civil Aircraft.
Title:Examination of the vibroacoustic behavior of a grid-stiffened panel with applied passive constrained layer damping
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Titze, MaikMaik.Titze (at) dlr.dehttps://orcid.org/0000-0001-5223-1538
Misol, MalteMalte.Misol (at) dlr.dehttps://orcid.org/0000-0001-8056-1569
Monner, Hans PeterHans.Monner (at) dlr.dehttps://orcid.org/0000-0002-5897-2422
Date:1 April 2019
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:453
DOI :10.1016/j.jsv.2019.03.021
Page Range:pp. 174-187
Publisher:Elsevier
ISSN:0022-460X
Status:Published
Keywords:Grid Panel, Constrained layer damping (CLD), Turbulent boundary layer (TBL), Passive damping, Isogrid, Lattice fuselage structure
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 - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Titze, Maik
Deposited On:29 Apr 2019 08:55
Last Modified:01 Aug 2019 12:03

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