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Performance of active feedforward control systems in non-ideal, synthesized diffuse sound fields

Misol, Malte and Bloch, Christian and Monner, Hans Peter and Sinapius, Michael (2014) Performance of active feedforward control systems in non-ideal, synthesized diffuse sound fields. Journal of the Acoustical Society of America, 135 (4), pp. 1887-1897. Acoustical Society of America. DOI: 10.1121/1.4865578 ISSN 0001-4966

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Official URL: http://scitation.aip.org/content/asa/journal/jasa/135/4/10.1121/1.4865578

Abstract

The acoustic performance of passive or active panel structures is usually tested in sound transmission loss facilities. A reverberant sending room, equipped with one or a number of independent sound sources, is used to generate a diffuse sound field excitation which acts as a disturbance source on the structure under investigation. The spatial correlation and coherence of such a synthesized non-ideal diffuse-sound-field excitation, however, might deviate significantly from the ideal case. This has consequences for the operation of an active feedforward control system which heavily relies on the acquisition of coherent disturbance source information. This work, therefore, evaluates the spatial correlation and coherence of ideal and non-ideal diffuse sound fields and considers the implications on the performance of a feedforward control system. The system under consideration is an aircraft-typical double panel system, equipped with an active sidewall panel (lining), which is realized in a transmission loss facility. Experimental results for different numbers of sound sources in the reverberation room are compared to simulation results of a comparable generic double panel system excited by an ideal diffuse sound field. It is shown that the number of statistically independent noise sources acting on the primary structure of the double panel system depends not only on the type of diffuse sound field but also on the sample lengths of the processed signals. The experimental results show that the number of reference sensors required for a defined control performance exhibits an inverse relationship to control filter length.

Item URL in elib:https://elib.dlr.de/89851/
Document Type:Article
Additional Information:Copyright (2014) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in The Journal of the Acoustical Society of America, Vol. 135, No. 4 and may be found at (http://scitation.aip.org/content/asa/journal/jasa/135/4/10.1121/1.4865578)
Title:Performance of active feedforward control systems in non-ideal, synthesized diffuse sound fields
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Misol, MalteInstitut für Faserverbundleichtbau und AdaptronikUNSPECIFIED
Bloch, ChristianUNSPECIFIEDUNSPECIFIED
Monner, Hans PeterInstitut für Faserverbundleichtbau und AdaptronikUNSPECIFIED
Sinapius, MichaelInstitut für Faseverbundleichtbau und AdaptronikUNSPECIFIED
Date:April 2014
Journal or Publication Title:Journal of the Acoustical Society of America
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:135
DOI :10.1121/1.4865578
Page Range:pp. 1887-1897
Publisher:Acoustical Society of America
ISSN:0001-4966
Status:Published
Keywords:Active feedforward control, diffuse sound field, double panel, spatial coherence, experiment
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: Stanitzek, Silke
Deposited On:21 Jul 2014 08:24
Last Modified:02 Nov 2019 22:50

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