@inproceedings{GeyerSarradjHobracht, author = {Geyer, Thomas and Sarradj, Ennes and Hobracht, Marcus}, title = {Schallentstehung durch anisotrope Zustr{\"o}mturbulenz}, series = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, booktitle = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-06-5}, pages = {858 -- 859}, language = {de} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Preliminary Benchmarking of Microphone Array Methods}, series = {Proceedings, Berlin Beamforming Conference, 2014}, booktitle = {Proceedings, Berlin Beamforming Conference, 2014}, publisher = {Gesellschaft zur F{\"o}rderung angewandter Informatik}, isbn = {978-3-942709-12-5}, language = {en} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Vergleich von Mikrofonarrayverfahren zur Schallquellencharakterisierung}, series = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, booktitle = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-06-5}, pages = {624 -- 625}, language = {de} } @misc{SarradjGeyer, author = {Sarradj, Ennes and Geyer, Thomas}, title = {Symbolic regression modeling of noise generation at porous airfoils}, series = {Journal of Sound and Vibration}, volume = {333}, journal = {Journal of Sound and Vibration}, number = {14}, issn = {0022-460X}, pages = {3189 -- 3202}, language = {en} } @misc{SarradjGeyerJobuschetal., author = {Sarradj, Ennes and Geyer, Thomas and Jobusch, Christoph and Kießling, Sebastian and Neefe, Alexander}, title = {Noise Characteristics of a Micro Gas Turbine for Use in a Serial Hybrid Concept}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2014-01-2066}, issn = {0148-7191}, doi = {10.4271/2014-01-2066}, language = {en} } @inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {Schnelle Laufzeitberechnung f{\"u}r die Schallausbreitung in inhomogenen Str{\"o}mungen}, series = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, booktitle = {DAGA 2014, 40. Jahrestagung f{\"u}r Akustik, "Fortschritte der Akustik" 10. - 13. M{\"a}rz 2014 Oldenburg}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-06-5}, pages = {848 -- 849}, language = {de} } @inproceedings{SarradjGeyerHerold, author = {Sarradj, Ennes and Geyer, Thomas and Herold, Gert}, title = {Dreidimensionale Quellcharakterisierung mit fortschrittlichen Mikrofonarrayverfahren f{\"u}r die Anwendung in der Maschinenakustik}, series = {Maschinenakustik 2014, Wettbewerbsvorteil durch ger{\"a}uscharme Produkte sichern, Karlsruhe, 12.-13.11.2014}, booktitle = {Maschinenakustik 2014, Wettbewerbsvorteil durch ger{\"a}uscharme Produkte sichern, Karlsruhe, 12.-13.11.2014}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-18-092229-4}, pages = {171 -- 184}, language = {de} } @inproceedings{LanghofSarradj, author = {Langhof, Carsten and Sarradj, Ennes}, title = {Sound Insulation of Structured Double Walls}, series = {Fortschritte der Akustik - AIA-DAGA, 2013}, booktitle = {Fortschritte der Akustik - AIA-DAGA, 2013}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, pages = {1252 -- 1255}, language = {en} } @misc{SarradjGeyer, author = {Sarradj, Ennes and Geyer, Thomas}, title = {Airfoil Noise Analysis using Symbolic Regression}, series = {19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference), AIAA paper 2013-2012, 2013}, journal = {19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference), AIAA paper 2013-2012, 2013}, publisher = {AIAA}, doi = {10.2514/6.2013-2012}, language = {en} } @inproceedings{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Measuring the Noise Generation in Owl Flight}, series = {Book of abstracts, Internoise 2014 Conference, 43rd International Congress on Noise Control Engineering, Melbourne, 16 - 19 November 2014}, booktitle = {Book of abstracts, Internoise 2014 Conference, 43rd International Congress on Noise Control Engineering, Melbourne, 16 - 19 November 2014}, language = {en} } @misc{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Silent Owl Flight: Comparative Acoustic Wind Tunnel Measurements on Prepared Wings}, series = {Acta Acustica united with Acustica}, volume = {99}, journal = {Acta Acustica united with Acustica}, number = {1}, issn = {1861-9959}, pages = {139 -- 153}, language = {en} } @inproceedings{GeyerSarradjNowigk, author = {Geyer, Thomas and Sarradj, Ennes and Nowigk, Joseph}, title = {Design and Construction of a Test Stand for Noise Measurements on Model Propellers}, series = {Fortschritte der Akustik - AIA-DAGA 2013}, booktitle = {Fortschritte der Akustik - AIA-DAGA 2013}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, pages = {1888 -- 1891}, language = {en} } @inproceedings{HeroldSarradjGeyer, author = {Herold, Gert and Sarradj, Ennes and Geyer, Thomas}, title = {Covariance Matrix Fitting for Aeroacoustic Application}, series = {Fortschritte der Akustik - AIA-DAGA 2013}, booktitle = {Fortschritte der Akustik - AIA-DAGA 2013}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, pages = {1926 -- 1928}, language = {en} } @misc{BallesterosSarradjFernandezBerlangaetal., author = {Ballesteros, Jos{\´e} Antonio and Sarradj, Ennes and Fernandez Berlanga, Marcos David and Geyer, Thomas and Ballesteros, Maria Jes{\´u}s}, title = {Noise Source Identification with Beamforming in the Pass-by of a Car}, series = {Applied Acoustics}, journal = {Applied Acoustics}, number = {vol. 93}, issn = {0003-682X}, pages = {106 -- 119}, language = {en} } @misc{GeyerSarradjHerold, author = {Geyer, Thomas and Sarradj, Ennes and Herold, Gert}, title = {Flow Noise Generation of Cylinders with Soft Porous Cover}, series = {21st AIAA/CEAS Aeroacoustics Conference 2015, Dallas, Texas, USA, 22 - 26 June 2015, held at the AIAA Aviation Forum 2015, vol. 5, (AIAA 2015-3147)}, journal = {21st AIAA/CEAS Aeroacoustics Conference 2015, Dallas, Texas, USA, 22 - 26 June 2015, held at the AIAA Aviation Forum 2015, vol. 5, (AIAA 2015-3147)}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-5108-0820-1}, pages = {3695 -- 3711}, language = {en} } @inproceedings{GeyerSarradjRexetal., author = {Geyer, Thomas and Sarradj, Ennes and Rex, Christoph and Kießling, Sebastian and Neefe, Alexander}, title = {Messung der Schallcharakteristik einer Mikrogasturbine}, 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} } @inproceedings{HenkeSarradj, author = {Henke, Anna-Sophia and Sarradj, Ennes}, title = {K{\"o}rperschallverhalten strukturierter Bleche}, 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} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Microphone Array Method for the Characterization of Rotating Sound Sources in Axial Fans}, series = {Fan 2015, International Conference on Fan Noise, Technology and Numerical Methods, Lyon 2015}, booktitle = {Fan 2015, International Conference on Fan Noise, Technology and Numerical Methods, Lyon 2015}, publisher = {Institution of Mechanical Engineers}, address = {London}, isbn = {978-0-9572374-3-8}, language = {en} } @misc{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {An Approach to Estimate the Reliability of Microphone Array Methods}, series = {21st AIAA/CEAS Aeroacoustics Conference 2015, Dallas, Texas, USA, 22 - 26 June 2015, held at the AIAA Aviation Forum 2015, vol. 4, (AIAA 2015-2977)}, journal = {21st AIAA/CEAS Aeroacoustics Conference 2015, Dallas, Texas, USA, 22 - 26 June 2015, held at the AIAA Aviation Forum 2015, vol. 4, (AIAA 2015-2977)}, publisher = {Curran}, address = {Red Hook, NY}, isbn = {978-1-5108-0820-1}, pages = {2688 -- 2697}, language = {en} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Mikrofonarrayverfahren zur Messung der abgestrahlten Schallleistung von Motorkomponenten}, 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} } @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} }