@inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {Optimal Planar Microphone Array Arrangements}, series = {Fortschritte der Akustik, DAGA 2015, N{\"u}rnberg, 41. Jahrestagung f{\"u}r Akustik, 16. - 19. M{\"a}rz 2015}, booktitle = {Fortschritte der Akustik, DAGA 2015, N{\"u}rnberg, 41. Jahrestagung f{\"u}r Akustik, 16. - 19. M{\"a}rz 2015}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, address = {Berlin}, isbn = {978-3-939296-08-9}, language = {de} } @misc{GeyerSarradjRexetal., author = {Geyer, Thomas and Sarradj, Ennes and Rex, Christoph and Kießling, Sebastian and Neefe, Alexander}, title = {Schallemission einer Mikrogasturbine}, series = {L{\"a}rmbek{\"a}mpfung}, journal = {L{\"a}rmbek{\"a}mpfung}, number = {6}, issn = {1436-4999}, pages = {268 -- 272}, language = {de} } @inproceedings{GusevaHoffmannUngeretal., author = {Guseva, Anastasia and Hoffmann, Maik and Unger, Alexander and Zulk, Silvia and El Amien, Mohamed Balla and Sarradj, Ennes and Kupnik, Mario}, title = {Ultrasonic transducer characterization in air based on an indirect acoustic radiation pressure measurement}, series = {IEEE International Ultrasonics Symposium (IUS), 21-24 October 2015, Taipei, Taiwan}, booktitle = {IEEE International Ultrasonics Symposium (IUS), 21-24 October 2015, Taipei, Taiwan}, publisher = {IEEE}, doi = {10.1109/ULTSYM.2015.0333}, pages = {1 -- 4}, language = {en} } @inproceedings{HaaseDierlHenkeetal., author = {Haase, Florian Vincent and Dierl, Adrian and Henke, Anna and Woll, Ralf and Sarradj, Ennes}, title = {Development of an experiment for impedance measurement of structured sandwich sheet metals by using a full factorial multi-stage approach}, series = {Proceedings, 19th QMOD-ICQSS Conference International Conference on Quality and Service Sciences, Rom (Italy)}, booktitle = {Proceedings, 19th QMOD-ICQSS Conference International Conference on Quality and Service Sciences, Rom (Italy)}, editor = {Dahlgaard-Park, Su Mi and Dahlgaard, Jens J{\"o}rn}, publisher = {Lund University Library Press}, address = {Lund}, isbn = {978-91-7623-086-2}, pages = {448 -- 462}, language = {en} } @misc{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Circular Cylinders with Soft Porous Cover for Flow Noise Reduction}, series = {Experiments in Fluids}, volume = {57}, journal = {Experiments in Fluids}, number = {3}, issn = {0723-4864}, doi = {10.1007/s00348-016-2119-7}, pages = {30}, abstract = {The use of porous materials is one of several approaches to passively control or minimize the generation of flow noise. In order to investigate the possible reduction of noise from struts and other protruding parts (for example components of the landing gear or pantographs), acoustic measurements were taken in a small aeroacoustic wind tunnel on a set of circular cylinders with a soft porous cover. The aim of this study was to identify those materials that result in the best noise reduction, which refers to both tonal noise and broadband noise. The porous covers were characterized by their air flow resistivity, a parameter describing the permeability of an open-porous material. The results show that materials with low air flow resistivities lead to a noticeable flow noise reduction. Thereby, the main effect of the porous cylinder covers is that the spectral peak of the aeolian tone due to vortex shedding appears much narrower, but is not suppressed completely. Based on the measurement results, a basic model for the estimation of the total peak level of the aeolian tone was derived. In addition to the minimization of the vortex shedding noise, a reduction of broadband noise can be observed, especially at higher Reynolds numbers. The noise reduction increases with decreasing air flow resistivity of the porous covers, which means that materials that are highly permeable to air result in the best noise reduction.}, language = {en} } @misc{GeyerWasalaCateretal., author = {Geyer, Thomas and Wasala, Sahan and Cater, John and Norris, Stuart and Sarradj, Ennes}, title = {Experimental Investigation of Leading Edge Hook Structures for Wind Turbine Noise Reduction : AIAA paper 2016-2954}, series = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, Vol. 5}, journal = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, Vol. 5}, publisher = {Curran Associates}, address = {Red Hook, NY}, isbn = {978-1-5108-2672-4}, pages = {3853 -- 3865}, language = {en} } @misc{GeyerClausSarradjetal., author = {Geyer, Thomas and Claus, Vanessa and Sarradj, Ennes and Markus, Philipp}, title = {Silent Owl Flight: The Effect of the Leading Edge Comb on the Gliding Flight Noise : AIAA paper 2016-3017}, series = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, vol. 7}, journal = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, vol. 7}, publisher = {Curran Associates}, address = {Red Hook, NY}, isbn = {978-1-5108-2672-4}, pages = {4885 -- 4896}, language = {en} } @misc{HeroldZengerSarradj, author = {Herold, Gert and Zenger, Florian and Sarradj, Ennes}, title = {Analyzing Noise Components on Skewed Fans with a Virtual Rotating Microphone Array : AIAA paper 2016-2761}, series = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016}, journal = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016}, publisher = {Curran Associates}, address = {Red Hook, NY}, isbn = {978-1-5108-2672-4}, language = {en} } @misc{Sarradj, author = {Sarradj, Ennes}, title = {A Fast Ray Casting Method for Sound Refraction at Shear Layers : AIAA paper 2016-2762}, series = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, vol. 2}, journal = {22nd AIAA/CEAS Aeroacoustics Conference 2016, Lyon, France, 30 May-1 June 2016, vol. 2}, publisher = {Curran Associates}, address = {Red Hook, NY}, isbn = {978-1-5108-2672-4}, pages = {981 -- 990}, language = {en} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Frequency Domain Deconvolution for Rotating Sources on an Axial Fan}, series = {BeBeC, 6th Berlin Beamforming Conference, February 29 - March 1, 2016, proceedings}, booktitle = {BeBeC, 6th Berlin Beamforming Conference, February 29 - March 1, 2016, proceedings}, publisher = {Berlin}, address = {Gesellschaft zur F{\"o}rderung angewandter Informatik}, pages = {8}, language = {en} }