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Reduction of Low-Frequency Sound Transmission Using an Array of 3D-Printed Resonant Structures

Algermissen, Stephan und Monner, Hans Peter (2018) Reduction of Low-Frequency Sound Transmission Using an Array of 3D-Printed Resonant Structures. In: ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2018. ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS), 2018-09-10 - 2018-09-12, San Antonio, TX, USA. doi: 10.1115/SMASIS2018-7985.

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Kurzfassung

The reduction of low-frequency noise transmission through thin-walled structures is a topic of research for many years now. Due to large wavelengths and the mass law, passive solutions usually gain low performance in the frequency range below 500 Hz. Active systems promised to fill the gap and to achieve significant reductions of transmitted sound. Nevertheless, experiments showed the outstanding performance of such specialized systems, but also demonstrated the computational and hardware effort of such solutions. The upcoming additive manufacturing technology enabled new multi-material designs of complex structures. Based on this technology, acoustic metamaterials emerged in the laboratories and in literature. Arrays of miniaturized locally resonant structures are able to change the noise transmission of thin walled structures beyond the limits of the given mass law in certain frequency bands. For future aircraft contra-rotating open rotor (CROR) engines are a promising technology to reduce their CO2 footprint. Since the contribution of CROR engines to the cabin noise is higher than for jet engines, new strategies for the reduction of noise transmissions for frequency bands below 200 Hz are necessary. For the tonal noise of the CROR engines, acoustic metamaterials seem to be an appropriate solution. In this paper a 110x110x1 mm^3 thin-walled sample plate is presented. It is covered with a 5x5 array of multi-material resonant structures, which are printed as mass on a beam. The rubber-like beam material combines a low Young's modulus with a high material damping, leading to a low eigenfrequency of the resonators. The design of the resonators using simulations and experimental data is shown. To explore the potential of the design, an acoustic test box is manufactured. Starting with all resonators unblocked the emitted sound intensity of the plate is measured. Sequential blocking of selected resonators proves the concept. Additional laser scanning vibrometer measurements give insights into the vibration behavior of single resonators.

elib-URL des Eintrags:https://elib.dlr.de/121713/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Reduction of Low-Frequency Sound Transmission Using an Array of 3D-Printed Resonant Structures
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Algermissen, StephanStephan.Algermissen (at) dlr.dehttps://orcid.org/0000-0002-0507-8195NICHT SPEZIFIZIERT
Monner, Hans PeterHans.Monner (at) dlr.dehttps://orcid.org/0000-0002-5897-2422NICHT SPEZIFIZIERT
Datum:12 September 2018
Erschienen in:ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.1115/SMASIS2018-7985
Status:veröffentlicht
Stichwörter:smart structures, acoustic metamaterial, 3d printing
Veranstaltungstitel:ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS)
Veranstaltungsort:San Antonio, TX, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:10 September 2018
Veranstaltungsende:12 September 2018
Veranstalter :ASME
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):L - keine Zuordnung
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Adaptronik
Hinterlegt von: Algermissen, Dr.-Ing. Stephan
Hinterlegt am:24 Sep 2018 07:53
Letzte Änderung:24 Apr 2024 20:25

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