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Experimental Synthesis of Sound Pressure Fields for Active Structural Acoustic Control Testing

Algermissen, Stephan and Meyer, S. and Appel, C. and Monner, Hans Peter (2014) Experimental Synthesis of Sound Pressure Fields for Active Structural Acoustic Control Testing. Journal of Intelligent Material Systems and Structures. SAGE Publications. doi: 10.1177/1045389X13493361. ISSN 1045-389X.

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For next generation aircraft, contra rotating open rotor propulsion systems are currently discussed. Their economic advantages are in conflict with their high noise emission, which concentrates in distinct frequency bands. To bring contra rotating open rotor engines into operation at commercial aircraft and to maintain the passenger comfort level, active systems for noise reduction are consi-dered. In this article, a contra rotating open rotor noise simulator for the future testing of active systems is presented. The simulator consists of a 14 x 8 loudspeaker array, which is placed close to a test fuselage. Driving each loudspeaker by a particular signal, complex sound pressure fields can be synthesized on the fuselage. The algorithm presented here calculates loudspeaker signals to synthesize the target sound pressure spectra on the fuselage. These target spectra were derived from numerical contra rotating open rotor engine simulations, coupled with a Ffowcs Williams–Hawkings solver to propagate the calculated sound pressure field toward virtual surface micropho-ne positions on the test fuselage. Requirement for such synthesis is the knowledge of the transfer paths from all loudspeakers to all surface microphones. In experiments, these paths are measured, and the loudspeaker signals are synthesized by the algorithm. Finally, measurements with the loudspeaker array and a microphone array are shown which prove the concept

Item URL in elib:https://elib.dlr.de/89018/
Document Type:Article
Title:Experimental Synthesis of Sound Pressure Fields for Active Structural Acoustic Control Testing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:Journal of Intelligent Material Systems and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1177/1045389X13493361
Publisher:SAGE Publications
Keywords:sound field reconstruction; open rotor; noise
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Böhringer-Thelen, Isolde
Deposited On:05 May 2014 08:18
Last Modified:10 Jan 2019 15:48

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