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Experimental transmission loss investigation of sandwich panels with different honeycomb core geometries

Radestock, Martin and Haase, Thomas and Monner, Hans Peter (2019) Experimental transmission loss investigation of sandwich panels with different honeycomb core geometries. In: 48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019. Internoise 2019, 16.-19. Jun. 2019, Madrid, Spanien.

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Abstract

Political Requirements like CO2 reduction lead to highly sophisticated design in aerospace engineering. Nowadays, structural components are multi-material composites, which combine a low mass with a high stiffness. The disadvantage is often an increased sound transmission due to these properties. Geometry variation of a honeycomb core in a sandwich panel is a promising approach to influence the transmission This paper presents experimental results of the transmission loss (TL) measurements for sandwich panels with different honeycomb cores of identical mass. A diffuse sound field from a reverberation room excites the sandwich panel and in the neighboring anechoic room the intensity is measured. This setup allows a narrow band TL measurement. Previous simulation studies show a shift of the Eigenfrequency dips in the TL up to 1000 Hz. This shift is not observed in the experiments probably due to the inherent damping. Nevertheless, the experiment shows a coincidental dip for a core with large cell diameter in the regarded frequency range, which depends on the core geometry. Also, the TL of this large cell core is higher compared to the other sandwiches for the frequency above the coincidental dip. This may allow preventing transmission in critical frequency bands for future aircrafts structures.

Item URL in elib:https://elib.dlr.de/128043/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental transmission loss investigation of sandwich panels with different honeycomb core geometries
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Radestock, MartinInstitut für Faserverbundleichtbau und Adaptronik - Adaptronikhttps://orcid.org/0000-0002-9918-3315
Haase, ThomasInstitut für Faserverbundleichtbau und Adaptronik - Adaptronikhttps://orcid.org/0000-0002-9553-9628
Monner, Hans PeterInstitut für Faserverbundleichtbau und Adaptronik - Adaptronikhttps://orcid.org/0000-0002-5897-2422
Date:2019
Journal or Publication Title:48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019
Refereed publication:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Honeycomb Core, Transmission Loss, Sandwich Structure
Event Title:Internoise 2019
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:16.-19. Jun. 2019
Organizer:Sociedad Espanola De Acustica
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:01 Jul 2019 08:51
Last Modified:01 Jul 2019 08:51

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