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Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects

Dannemann, Martin and Kucher, Michael and Kunze, Eckhart and Modler, Nils and Knobloch, Karsten and Enghardt, Lars and Sarradj, Ennes and Höschler, Klaus (2018) Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects. Applied Sciences, 8 (10), p. 1923. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/app8101923 ISSN 2076-3417

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Official URL: https://www.mdpi.com/2076-3417/8/10/1923

Abstract

In aero engines, noise absorption is realised by acoustic liners, e.g., Helmholtz resonator (HR) liners, which often absorb sound only in a narrow frequency range. Due to developments of new engine generations, an improvement of overall acoustic damping performance and in particular more broadband noise absorption is required. In this paper, a new approach to increase the bandwidth of noise absorption for HR liners is presented. By replacing rigid cell walls in the liner’s honeycomb core structure by flexible polymer films, additional acoustic energy is dissipated. A manufacturing technology for square honeycomb cores with partially flexible walls is described. Samples with different flexible wall materials were fabricated and tested. The acoustic measurements show more broadband sound absorption compared to a reference liner with rigid walls due to acoustic-structural interaction. Manufacturing-related parameters are found to have a strong influence on the resulting vibration behaviour of the polymer films, and therefore on the acoustic performance. For future use, detailed investigations to ensure the liner segments compliance with technical, environmental, and life-cycle requirements are needed. However, the results of this study show the potential of this novel liner concept for noise reduction in future aero-engines.

Item URL in elib:https://elib.dlr.de/122996/
Document Type:Article
Additional Information:The financial support of the work in the framework of the LuFo V-2 project LaKS (noise absorbing composite structures) by the Federal Ministry for Economic Affairs and Energy (contract number 20E1502A) based on a decision of the German Bundestag is gratefully acknowledged.
Title:Experimental Study of Advanced Helmholtz Resonator Liners with Increased Acoustic Performance by Utilising Material Damping Effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dannemann, MartinILK, TU DresdenUNSPECIFIED
Kucher, MichaelILK, TU DresdenUNSPECIFIED
Kunze, EckhartILK, TU DresdenUNSPECIFIED
Modler, NilsILK, TU DresdenUNSPECIFIED
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Enghardt, Larslars.enghardt (at) dlr.deUNSPECIFIED
Sarradj, EnnesTU BerlinUNSPECIFIED
Höschler, KlausBTU Cottbus-SenftenbergUNSPECIFIED
Date:15 October 2018
Journal or Publication Title:Applied Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:8
DOI :10.3390/app8101923
Page Range:p. 1923
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2076-3417
Status:Published
Keywords:novel liners, aero-acoustics, aero-engines, acoustic damping
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: Knobloch, Dr. Karsten
Deposited On:12 Nov 2018 09:15
Last Modified:14 Dec 2019 04:24

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