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A hybrid frequency-based/mode component synthesis model for cabin noise prediction with arbitrary damping distribution

Hesse, Christian and Biedermann, Jörn (2021) A hybrid frequency-based/mode component synthesis model for cabin noise prediction with arbitrary damping distribution. 27th International Congress on Sound and Vibration, 11.-16. Jul. 2021, Prag, Tschechien.

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Abstract

The design of low-frequency noise control measures in aircraft cabins requires reliable and efficient calculation methods for interior noise. While computers are getting increasingly powerful, the iterative nature of the aircraft design calls for the ability to predict dynamic response of a huge amount of designs in a wide frequency range in a short time. Due to limited numerical resources, a lot of studies concentrate on the component mode synthesis. Uncoupled modes of the structural and acoustic part are calculated and coupled on the fluid-structural interface. This component mode synthesis is shown to produce accurate results for the interior pressure calculation. However, most studies are limited to the use of rigid-walled acoustic modes or the incorporation of a classic damping model. The acoustic damping distribution in an aircraft cabin is highly arbitrary and therefore the modes can become complex-valued. This paper aims at the introduction of a hybrid computation model, where the structural part is frequency-based and the acoustic cavity incorporates a subset of complex-valued modes. The hybrid computation model facilitates the calculation of many structural designs while leaving the acoustic eigenvectors unaltered. It is shown, that due to the frequency-based nature, the structural part converges with very few acoustic modes and the modal projection of the acoustic part leads to a significant reduction in computation time with only a slight accuracy loss in the considered frequency range.

Item URL in elib:https://elib.dlr.de/143399/
Document Type:Conference or Workshop Item (Speech)
Title:A hybrid frequency-based/mode component synthesis model for cabin noise prediction with arbitrary damping distribution
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hesse, ChristianChristian.Hesse (at) dlr.dehttps://orcid.org/0000-0002-9456-5277
Biedermann, Jörnjoern.biedermann (at) dlr.deUNSPECIFIED
Date:July 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:aircraft cabin acoustics, fluid-structure interaction
Event Title:27th International Congress on Sound and Vibration
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:11.-16. Jul. 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - MRO and Cabin
Location: Hamburg
Institutes and Institutions:Institute of System Architectures in Aeronautics > Cabin and Payload Systems
Deposited By: Hesse, Dr. Christian
Deposited On:27 Sep 2021 12:56
Last Modified:27 Sep 2021 12:56

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