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Feedforward control of sound transmission through a fuselage structure with active trim panels

Misol, Malte and Haase, Thomas and Algermissen, Stephan and Hesse, Christian (2012) Feedforward control of sound transmission through a fuselage structure with active trim panels. Internoise, 19. - 22. Aug. 2012, New York City, USA.

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The application of feedback control for the active reduction of stochastic broadband disturbances is widely recognized as superior to feedforward control. However, if the spatial and temporal correlation of sensor signals is high and the control-system configuration is causal, a significant disturbance rejection can be achieved by the application of feedforward control. The reason for this is its ability to reduce both resonant and forced structural vibration. In case of one-dimensional problems, e.g. sound-propagating ducts, the coherence and causality requirements can generally be met and the application of broadband feedforward control is state-of-the-art of science and technology. Yet for higher dimensional problems it can become difficult or even impossible to achieve these requirements. In this research work the attempt was made to exploit the double-wall construction of a typical aircraft fuselage to set up a causal feedforward control system for an active trim panel with improved low-frequency sound transmission loss (< 500 Hz). Different configurations of an active trim panel with structural actuators and sensors have been simulated and experimentally realized in a sound transmission loss facility. Experimental results prove the ability of the investigated smart trim panels to considerably reduce structural vibration and sound power in third-octave bands.

Item URL in elib:https://elib.dlr.de/78308/
Document Type:Conference or Workshop Item (Speech)
Title:Feedforward control of sound transmission through a fuselage structure with active trim panels
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hesse, Christianinstitut für faserverbundleichtbau und adaptronik - adaptronikUNSPECIFIEDUNSPECIFIED
Date:August 2012
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:ASAC, feedforward control, transmissions loss, broadband noise, double-wall
Event Title:Internoise
Event Location:New York City, USA
Event Type:international Conference
Event Dates:19. - 22. Aug. 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:V SH - Verbesserung der Sicherheit im Verkehr (old)
DLR - Research area:Transport
DLR - Program:V SH - Verbesserung der Sicherheit im Verkehr
DLR - Research theme (Project):V - Aktive Vibrations- und Lärmreduzierung an Fahrzeugen (old), L - Quiet Air Traffic (old), W - no assignment (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Böhringer-Thelen, Isolde
Deposited On:07 Nov 2012 12:05
Last Modified:16 May 2017 13:40

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