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Full-scale experiments on the reduction of propeller-induced aircraft interior noise with active trim panels

Misol, Malte (2020) Full-scale experiments on the reduction of propeller-induced aircraft interior noise with active trim panels. Applied Acoustics, 159, p. 107086. Elsevier. DOI: 10.1016/j.apacoust.2019.107086 ISSN 0003-682X

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Official URL: http://dx.doi.org/10.1016/j.apacoust.2019.107086

Abstract

Results are presented of full-scale experiments on the active reduction of rotor-induced passenger cabin noise in a Dornier Do728 aircraft. Two active sidewall panels (smart linings) are used to reduce the sound pressure in a control region in front of the linings. The fuselage pressure distribution associated with the first five harmonics of a generic counter-rotating open rotor (CROR) engine is emulated with a loudspeaker array. Each smart lining is equipped with two inertial force actuators. It uses up to eight error microphones and implements an adaptive feedforward controller. The two smart linings are driven in parallel. A maximum SPL reduction of 11.3 dB is achieved in the controlled area. The mean SPL reduction over 18 microphones is 6.8 dB. At the most critical second frequency, a mean SPL reduction of 9.3 dB is achieved by the two smart linings working in parallel. It is observed that the SPLs near the lining (at the window seat positions) are significantly higher than the SPLs near the aisle. This leads to the conclusion that the major part of the sound energy is transmitted through the linings, which is seen as an argument for the suitability of the smart lining concept.

Item URL in elib:https://elib.dlr.de/129910/
Document Type:Article
Title:Full-scale experiments on the reduction of propeller-induced aircraft interior noise with active trim panels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Misol, MalteMalte.Misol (at) dlr.dehttps://orcid.org/0000-0001-8056-1569
Date:2020
Journal or Publication Title:Applied Acoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:159
DOI :10.1016/j.apacoust.2019.107086
Page Range:p. 107086
Publisher:Elsevier
ISSN:0003-682X
Status:Published
Keywords:aircraft, rotor noise, propeller noise, interior noise, active control, lining
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 - Systems and Cabin
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Misol, Dr. Malte
Deposited On:02 Nov 2019 22:48
Last Modified:02 Nov 2019 22:48

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