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Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft

Haase, Thomas and Unruh, Oliver and Algermissen, Stephan and Pohl, Martin (2016) Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft. Journal of Sound and Vibration. Elsevier. DOI: 10.1016/j.jsv.2016.04.038i ISSN 0022-460X (In Press)

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Official URL: http://dx.doi.org/10.1016/j.jsv.2016.04.038

Abstract

The fuel consumption of future civil aircraft needs to be reduced because of the CO2 restrictions declared by the European Union. A consequent lightweight design and a new engine concept called counter-rotating open rotor are seen as key technologies in the attempt to reach this ambitious goals. Bearing in mind that counter-rotating open rotor engines emit very high sound pressures at low frequencies and that lightweight structures have a poor transmission loss in the lower frequency range, these key technologies raise new questions in regard to acoustic passenger comfort. One of the promising solutions for the reduction of sound pressure levels inside the aircraft cabin are active sound and vibration systems. So far, active concepts have rarely been investigated for a counter-rotating open rotor pressure excitation on complex airframe structures. Hence, the state of the art is augmented by the preliminary study presented in this paper. The study shows how an active vibration control system can influence the sound transmission of counter-rotating open rotor noise through a complex airframe structure into the cabin. Furthermore, open questions on the way towards the realisation of an active control system are addressed. In this phase, an active feedforward control system is investigated in a fully equipped Dornier 728 experimental prototype aircraft. In particular, the sound transmission through the airframe, the coupling of classical actuators (inertial and piezoelectric patch actuators) into the structure and the performance of the active vibration control system with different error sensors are investigated. It can be shown that the active control system achieves a reduction up to 5 dB at several counter-rotating open rotor frequencies but also that a better performance could be achieved through further optimisations.

Item URL in elib:https://elib.dlr.de/104324/
Document Type:Article
Additional Information:The attached document is the official pre-print submitted to the Journal of Sound and Vibration. The orignal publihed Version can be found at: http://dx.doi.org/10.1016/j.jsv.2016.04.038 All Copyrights of the acticle belongs to Elsevier ltd.
Title:Active control of counter-rotating open rotor interior noise in a Dornier 728 experimental aircraft
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haase, ThomasThomas.Haase (at) dlr.dehttps://orcid.org/0000-0002-9553-9628
Unruh, OliverOliver.Unruh (at) dlr.deUNSPECIFIED
Algermissen, StephanStephan.Algermissen (at) dlr.deUNSPECIFIED
Pohl, MartinMartin.Pohl (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jsv.2016.04.038i
Editors:
EditorsEmail
UNSPECIFIEDElsevier
Publisher:Elsevier
ISSN:0022-460X
Status:In Press
Keywords:CROR; Feedforward control; Active vibration control; Airframe structures
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 - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Haase, Thomas
Deposited On:30 May 2016 05:56
Last Modified:31 Jul 2019 20:01

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