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Transmission loss adaption of sandwich panels with honeycomb core variation

Radestock, Martin and Haase, Thomas and Monner, Hans Peter (2018) Transmission loss adaption of sandwich panels with honeycomb core variation. In: 47th International Congress and Exposition on Noise Control Engineering 2018, INTER-NOISE 2018. Institute of Noise Control Engineering of the United States of America. 47th International Congress and Exposition of Noise Control Engineering (Internoise 2018), 26.-29. Aug. 2018, Chicago, USA. ISBN 978-1-7325986-0-7

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Official URL: http://inceusa.org

Abstract

Nowadays the primary and interior structures of modern transport aircrafts are of high stiffness and low weight. One example is the utilization of honeycomb sandwich panels which are used in cabin linings or nacelles. From an acoustic point of view such panels are disadvantageous because of the hollow core and the high stiffness to weight ratio. The core influences the sandwich stiffness at a minor level, but a core design change can affect the acoustic behavior more significant. Thus, within this paper a design tool will be presented which calculates a honeycomb core with a variable geometry and constant mass. This way it is ensured that the determined transmission loss variations are only due to the different honeycomb geometries. After the geometrical design the tool calculates the transmission loss via a harmonic finite element analysis. The results of the core variation clearly show an influence on the sound transmission. The eigenmodes of an exemplary sandwich shifted over 400 Hz with the core variation. Also, the amplitude of the transmission loss changes at these higher frequencies. For experimental investigations these honeycomb core geometries are realized by additive manufacturing. The honeycombs consist of plastic and the selected face sheets of glass fiber.

Item URL in elib:https://elib.dlr.de/121657/
Document Type:Conference or Workshop Item (Speech)
Title:Transmission loss adaption of sandwich panels with honeycomb core variation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Radestock, MartinInstitut für Faserverbundleichtbau und Adaptronik - Adaptronikhttps://orcid.org/0000-0002-9918-3315
Haase, ThomasThomas.Haase (at) dlr.dehttps://orcid.org/0000-0002-9553-9628
Monner, Hans PeterInstitut für Faserverbundleichtbau und Adaptronik - Adaptronikhttps://orcid.org/0000-0002-5897-2422
Date:2018
Journal or Publication Title:47th International Congress and Exposition on Noise Control Engineering 2018, INTER-NOISE 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Herrin, DavidInstitute of Noise Control Engineering of the United States of America
Cuschieri, JosephInstitute of Noise Control Engineering of the United States of America
Ebbitt, GordonInstitute of Noise Control Engineering of the United States of America
Publisher:Institute of Noise Control Engineering of the United States of America
ISBN:978-1-7325986-0-7
Status:Published
Keywords:Schalldämmmaß, Sandwichstruktur, Wabenkern, Diffusfeldanregung
Event Title:47th International Congress and Exposition of Noise Control Engineering (Internoise 2018)
Event Location:Chicago, USA
Event Type:international Conference
Event Dates:26.-29. Aug. 2018
Organizer:Institute of Noise Control Engineering of the United States of America
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: Radestock, Martin
Deposited On:17 Sep 2018 07:36
Last Modified:29 Aug 2019 03:00

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