Open Access
CLEAN based on spatial source coherence
Aiaa Paper
- 01 Jan 2007
84
About: The article was published on 01 Jan 2007. and is currently open access. The article focuses on the topics: Coherence (statistics).
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Citations
Porous airfoils: noise reduction and boundary layer effects
Thomas F. Geyer,Ennes Sarradj,Christoph Fritzsche +2 more
- 01 Jul 2010
TL;DR: In this paper, the boundary layer properties of porous airfoils and the noise generated at the trailing edge were analyzed using a planar 56-channel microphone array and the boundary layers were measured using constant temperature anemometry.
104
Using phased array beamforming to identify broadband noise sources in a turbofan engine
TL;DR: The application of phased array beamforming techniques was applied to acoustic data measured by two circular microphone arrays that were mounted in the intake and in the bypass of a Rolls-Royce fan rig for a better understanding of the source mechanisms of fan broadband noise.
76
Application of a Beamforming Technique to the Measurement of Airfoil Leading Edge Noise
TL;DR: In this article, the authors used a microphone array and beamforming algorithms for the measurement and analysis of noise generated by the interaction of a turbulent flow with the leading edge of an airfoil.
A Microphone Array Method Benchmarking Exercise using Synthesized Input Data
Ennes Sarradj,Gert Herold,Pieter Sijtsma,R. Merino Martinez,A.M.N. Malgoezar,Mirjam Snellen,Thomas F. Geyer,Christopher J. Bahr,Ric Porteous,Danielle J. Moreau,Con J. Doolan +10 more
- 05 Jun 2017
Abstract: Citation (APA) Sarradj, E., Herold, G., Sijtsma, P., Merino Martinez, R., Malgoezar, A., Snellen, M., Geyer, T. F., Bahr, C. J., Porteous, R., Moreau, D. J., & Doolan, C. J. (2017). A Microphone Array Method Benchmarking Exercise using Synthesized Input Data. In 23rd AIAA/CEAS Aeroacoustics Conference: 5-9 June 2017, Denver, Colorado [AIAA 2017-3719] American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2017-3719
Deconvolution of Sources in Aeroacoustic Images from Phased Microphone Arrays Using Linear Programming
Robert P. Dougherty,Rakesh C. Ramachandran,Ganesh Raman +2 more
- 01 Dec 2013
TL;DR: A new deconvolution strategy for aeroacoustic beamforming based on linear programming (LP) is introduced and results of an aeroACoustic test show that it produces virtually the same results as DAMAS in much less time.
52
References
A deconvolution approach for the mapping of acoustic sources (DAMAS) determined from phased microphone arrays
TL;DR: DecDeconvolution Approach for the Mapping of Acoustic Sources (DAMAS) as mentioned in this paper removes beamforming characteristics from output presentations, and a unique linear system of equations accounts for reciprocal influence at different locations over the array survey region.
833
Determination of absolute levels from phased array measurements using spatial source coherence
Stefan Oerlemans,Pieter Sijtsma +1 more
- 17 Jun 2002
TL;DR: In this article, an array processing technique is presented which determines the coherence level between different sources in the scan plane, which is used to identify mirror sources in a closed wind tunnel, in order to estimate the spanwise coherence length.
90
Sidelobe suppression for phased array aeroacoustic measurements
Robert P. Dougherty,Robert W. Stoker +1 more
- 02 Jun 1998
TL;DR: In this paper, robust adaptive beamforming, cross spectral matrix element weighting, and CLEAN algorithm are applied to four array designs using simulated wind tunnel data, including a cross, an array of four crosses, a filled square, and a spiral array.
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