@inproceedings{KlaukeKuehhornLiangetal., author = {Klauke, Thomas and K{\"u}hhorn, Arnold and Liang, Luo and Kober, Markus and Sieghart, D. and F{\"u}hrer, M. and Viehweger, Bernd and Fritzsche, Christoph and Sarradj, Ennes}, title = {Entwicklung eines 3-Blatt-CFK-Verstellpropellers f{\"u}r Ultraleichtflugzeuge}, abstract = {Deutscher Luft- und Raumfahrkongress 2010, 31.08. - 02.09.2010, Hamburg}, language = {de} } @inproceedings{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Zur Minderung des Umstr{\"o}mungsger{\"a}usches bei Profilen aus por{\"o}sem Material}, language = {de} } @inproceedings{GieslerSarradj, author = {Giesler, Jens and Sarradj, Ennes}, title = {Vorderkantenschall - Modelle und Versuch}, series = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, booktitle = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, language = {de} } @inproceedings{GieslerSarradj, author = {Giesler, Jens and Sarradj, Ennes}, title = {Experimentelle Analyse der aeroakustischen Schallentstehung an Zylinder-Profil-Anordnungen}, language = {de} } @inproceedings{GieslerSarradj, author = {Giesler, Jens and Sarradj, Ennes}, title = {Broadband noise investigation on rod-airfoil-configurations}, language = {en} } @inproceedings{GieslerSarradj, author = {Giesler, Jens and Sarradj, Ennes}, title = {Modifikation am aeroakustischen Windkanal der BTU Cottbus}, language = {de} } @inproceedings{HobrachtSarradjGeyer, author = {Hobracht, Marcus and Sarradj, Ennes and Geyer, Thomas}, title = {Auslegung eines Turbulenzgitters f{\"u}r die Untersuchung des Vorderkantenschalls an einem Tragfl{\"u}gelprofil}, series = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, booktitle = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, language = {de} } @misc{SarradjFritzscheGeyeretal., author = {Sarradj, Ennes and Fritzsche, Christoph and Geyer, Thomas and Giesler, Jens}, title = {Acoustic and aerodynamic design and characterization of a small-scale aeroacoustic wind tunnel}, language = {en} } @misc{Sarradj, author = {Sarradj, Ennes}, title = {A fast signal subspace approach for the determination of absolute levels from phased microphone array measurements}, series = {Journal of Sound and Vibration}, volume = {329}, journal = {Journal of Sound and Vibration}, number = {9}, issn = {0022-460x}, pages = {1553 -- 1569}, language = {en} } @misc{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Porous Airfoils: Noise Reduction and Boundary Layer Effects}, language = {en} } @misc{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Measurement of the noise generation at the trailing edge of porous airfoils}, series = {Experiments in Fluids}, volume = {48}, journal = {Experiments in Fluids}, number = {2}, issn = {0723-4864}, pages = {291 -- 308}, language = {en} } @inproceedings{FritzscheSarradjGeyer, author = {Fritzsche, Christoph and Sarradj, Ennes and Geyer, Thomas}, title = {Akustische Polaren}, language = {de} } @inproceedings{FritzscheSarradjGeyer, author = {Fritzsche, Christoph and Sarradj, Ennes and Geyer, Thomas}, title = {Silent owl flight: setup for flyover noise measurements}, language = {en} } @inproceedings{FritzscheSarradjGeyeretal., author = {Fritzsche, Christoph and Sarradj, Ennes and Geyer, Thomas and Giesler, Jens}, title = {Hinterkantenger{\"a}usch an einem aerodynamischen Profil}, language = {de} } @inproceedings{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Der leise Flug der Eulen}, series = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, booktitle = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-02-7}, language = {de} } @inproceedings{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Schallentstehung und turbulente Grenzschicht an der Hinterkante por{\"o}ser Profile}, language = {de} } @inproceedings{GeyerSarradjFritzsche, author = {Geyer, Thomas and Sarradj, Ennes and Fritzsche, Christoph}, title = {Silent owl flight: experiments in the aeroacoustic wind tunnel}, language = {en} } @inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {Aeroacoustic source characterisation using subspace and deconvolution techniques}, series = {Noise and vibration: emerging methods, Oxford, UK, 5 - 8 April 2009, proceedings of NOVEM 2009}, booktitle = {Noise and vibration: emerging methods, Oxford, UK, 5 - 8 April 2009, proceedings of NOVEM 2009}, publisher = {ISVR}, address = {Southampton}, isbn = {978-0-85432-900-7}, language = {en} } @inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {Mikrofonarrayverfahren f{\"u}r kompakte aeroakustische Quellen}, language = {de} } @inproceedings{SarradjFritzsche, author = {Sarradj, Ennes and Fritzsche, Christoph}, title = {Integrierte aerodynamische und akustische Auslegung eines Propellers f{\"u}r Ultraleichtflugzeuge}, series = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, booktitle = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, language = {de} } @inproceedings{SchulzGieslerSarradj, author = {Schulz, Falko and Giesler, Jens and Sarradj, Ennes}, title = {Experimentelle Untersuchungen zur Schallabstrahlung komplexer Filtergeometrien}, series = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, booktitle = {Fortschritte der Akustik, DAGA 2011, 37. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2011 in D{\"u}sseldorf}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, language = {de} } @misc{SarradjFritzscheGeyer, author = {Sarradj, Ennes and Fritzsche, Christoph and Geyer, Thomas}, title = {Silent Owl Flight: Bird Flyover Noise Measurements}, language = {en} } @inproceedings{SarradjGeyerGiesler, author = {Sarradj, Ennes and Geyer, Thomas and Giesler, Jens}, title = {Ein Messverfahren f{\"u}r Vorderkantenschall}, series = {Fortschritte der Akustik, DAGA 2012, 38. Deutsche Jahrestagung f{\"u}r Akustik, 19. - 22. M{\"a}rz 2012 in Darmstadt}, booktitle = {Fortschritte der Akustik, DAGA 2012, 38. Deutsche Jahrestagung f{\"u}r Akustik, 19. - 22. M{\"a}rz 2012 in Darmstadt}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-04-1}, pages = {745 -- 746}, language = {de} } @misc{GeyerSarradjGiesler, author = {Geyer, Thomas and Sarradj, Ennes and Giesler, Jens}, title = {Application of a Beamforming Technique to the Measurement of Airfoil Leading Edge Noise}, series = {Advances in Acoustics and Vibration}, journal = {Advances in Acoustics and Vibration}, issn = {1687-6261}, pages = {16}, language = {de} } @misc{Sarradj, author = {Sarradj, Ennes}, title = {Three-Dimensional Acoustic Source Mapping with Different Beamforming Steering Vector Formulations}, series = {Advances in Acoustics and Vibration}, journal = {Advances in Acoustics and Vibration}, issn = {1687-6261}, pages = {12}, language = {de} } @inproceedings{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Hinterkantenschallmodell f{\"u}r por{\"o}se Tragfl{\"u}gel}, series = {Fortschritte der Akustik, DAGA 2012, 38. Deutsche Jahrestagung f{\"u}r Akustik, 19. - 22. M{\"a}rz 2012 in Darmstadt}, booktitle = {Fortschritte der Akustik, DAGA 2012, 38. Deutsche Jahrestagung f{\"u}r Akustik, 19. - 22. M{\"a}rz 2012 in Darmstadt}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, isbn = {978-3-939296-04-1}, pages = {2}, language = {de} } @inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {Three-Dimensional Acoustic Source Mapping}, series = {Proceedings, Fourth Berlin Beamforming Conference, 22. \& 23. February 2012}, booktitle = {Proceedings, Fourth Berlin Beamforming Conference, 22. \& 23. February 2012}, address = {Berlin}, isbn = {978-3-942709-04-0}, pages = {9}, language = {en} } @inproceedings{SarradjGeyerBricketal., author = {Sarradj, Ennes and Geyer, Thomas and Brick, Haike and Kirchner, Karl-Richard and Kohrs, Torsten}, title = {Application of Beamforming and Deconvolution Techniques to Aeroacoustic Sources at Highspeed Trains}, series = {Proceedings of NOVEM 2012, Noise and Vibration: Emerging Methods, Sorrento, Italien, 01.04. - 04.04.2012}, booktitle = {Proceedings of NOVEM 2012, Noise and Vibration: Emerging Methods, Sorrento, Italien, 01.04. - 04.04.2012}, pages = {11}, language = {en} } @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} } @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{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} } @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{GeyerPoppeSarradj, author = {Geyer, Thomas and Poppe, Willi and Sarradj, Ennes}, title = {Measurement of flow noise generation and pressure loss of nets and screens}, series = {Applied Acoustics}, volume = {134}, journal = {Applied Acoustics}, issn = {0003-682X}, doi = {10.1016/j.apacoust.2018.01.008}, pages = {69 -- 74}, language = {en} } @inproceedings{JekoschSarradjHeroldetal., author = {Jekosch, Simon and Sarradj, Ennes and Herold, Gert and Geyer, Thomas}, title = {Comparison of different solvers for general inverse beamforming algorithms for highresolution aeroacoustic source characterization}, series = {7th Berlin Beamforming Conference, BeBeC}, booktitle = {7th Berlin Beamforming Conference, BeBeC}, pages = {10}, 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{ZengerHeroldBeckeretal., author = {Zenger, Florian and Herold, Gert and Becker, Stefan and Sarradj, Ennes}, title = {Sound source localization on an axial fan at different operating points}, series = {Experiments in Fluids}, volume = {57}, journal = {Experiments in Fluids}, issn = {0723-4864}, doi = {10.1007/s00348-016-2223-8}, pages = {136}, language = {en} } @misc{KampsGeyerSarradjetal., author = {Kamps, Laura and Geyer, Thomas and Sarradj, Ennes and Br{\"u}cker, Christoph}, title = {Vortex shedding noise of a cylinder with hairy flaps}, series = {Journal of Sound and Vibration}, volume = {388}, journal = {Journal of Sound and Vibration}, issn = {0022-460X}, doi = {10.1016/j.jsv.2016.10.039}, pages = {69 -- 84}, language = {en} } @misc{SarradjHerold, author = {Sarradj, Ennes and Herold, Gert}, title = {A Python framework for microphone array data processing}, series = {Applied Acoustics}, volume = {116}, journal = {Applied Acoustics}, issn = {0003-682X}, doi = {10.1016/j.apacoust.2016.09.015}, pages = {50 -- 58}, language = {en} } @misc{HeroldGeyerMarkusetal., author = {Herold, Gert and Geyer, Thomas and Markus, Philipp and Sarradj, Ennes}, title = {Simultaneous Sound Power Measurement of Engine Components}, series = {SAE International Journal of Passenger Cars - Mechanical Systems}, volume = {9}, journal = {SAE International Journal of Passenger Cars - Mechanical Systems}, number = {3}, issn = {1946-3995}, doi = {10.4271/2016-01-1774}, pages = {974 -- 979}, language = {en} } @misc{GeyerClausHalletal., author = {Geyer, Thomas and Claus, Vanessa and Hall, Philipp and Sarradj, Ennes}, title = {Silent Owl Flight: The Effect of the Leading Edge Comb}, series = {International Journal of Aeroacoustics}, volume = {16}, journal = {International Journal of Aeroacoustics}, number = {3}, issn = {2048-4003}, pages = {115 -- 134}, language = {en} } @misc{GeyerSchulzThuermeretal., author = {Geyer, Thomas and Schulz, Adrian and Th{\"u}rmer, Konrad and Sarradj, Ennes and Stapel, Jennifer}, title = {Schallemission wasserwirtschaftlicher Anlagen}, series = {L{\"a}rmbek{\"a}mpfung}, journal = {L{\"a}rmbek{\"a}mpfung}, number = {3}, issn = {1436-4999}, pages = {99 -- 103}, language = {de} } @inproceedings{MoreauGeyerDoolanetal., author = {Moreau, Danielle J. and Geyer, Thomas and Doolan, Con and Sarradj, Ennes}, title = {Influence of Camber on Wall-Mounted Finite Airfoil Tonal Noise Generation}, series = {4th Symposium on Fluid-Structure-Sound Interactions and Control, Tokio, 2017}, booktitle = {4th Symposium on Fluid-Structure-Sound Interactions and Control, Tokio, 2017}, publisher = {Springer}, address = {Singapore}, isbn = {978-981-10-7542-1}, pages = {337 -- 342}, language = {en} } @misc{HoeltgenBreussHeroldetal., author = {Hoeltgen, Laurent and Breuß, Michael and Herold, Gert and Sarradj, Ennes}, title = {Sparse ℓ1 regularisation of matrix valued models for acoustic source characterisation}, series = {Optimization and Engineering}, volume = {19}, journal = {Optimization and Engineering}, number = {1}, issn = {1389-4420}, doi = {10.1007/s11081-017-9357-2}, pages = {39 -- 70}, abstract = {We present a strategy for the recovery of a sparse solution of a common problem in acoustic engineering, which is the reconstruction of sound source levels and locations applying microphone array measurements. The considered task bears similarities to the basis pursuit formalism but also relies on additional model assumptions that are challenging from a mathematical point of view. Our approach reformulates the original task as a convex optimisation model. The sought solution shall be a matrix with a certain desired structure. We enforce this structure through additional constraints. By combining popular splitting algorithms and matrix differential theory in a novel framework we obtain a numerically efficient strategy. Besides a thorough theoretical consideration we also provide an experimental setup that certifies the usability of our strategy. Finally, we also address practical issues, such as the handling of inaccuracies in the measurement and corruption of the given data. We provide a post processing step that is capable of yielding an almost perfect solution in such circumstances.}, language = {en} } @misc{HenkeSarradjLanghof, author = {Henke, Anna-Sophia and Sarradj, Ennes and Langhof, Carsten}, title = {Driving-point mobility and sound insulation of structured sheet metal}, series = {Applied Acoustics}, volume = {136}, journal = {Applied Acoustics}, issn = {0003-682X}, pages = {113 -- 122}, language = {en} } @misc{GeyerMoreauGiesleretal., author = {Geyer, Thomas and Moreau, Danielle J. and Giesler, Jens and Hall, Philipp and Sarradj, Ennes and Doolan, Con}, title = {Measurement of the noise generated by wall-mounted airfoils of different thickness}, series = {24th AIAA/CEAS Aeroacoustics Conference 2018, Atlanta, USA, 25 June - 29 June 2018, (AIAA 2018-3796)}, journal = {24th AIAA/CEAS Aeroacoustics Conference 2018, Atlanta, USA, 25 June - 29 June 2018, (AIAA 2018-3796)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-560-9}, language = {en} } @misc{GeyerSharmaSarradj, author = {Geyer, Thomas and Sharma, Sparsh and Sarradj, Ennes}, title = {Detached Eddy Simulation of the Flow Noise Generation of Cylinders with Porous Cover}, series = {24th AIAA/CEAS Aeroacoustics Conference 2018, Atlanta, USA, 25 June - 29 June 2018, (AIAA 2018-3472)}, journal = {24th AIAA/CEAS Aeroacoustics Conference 2018, Atlanta, USA, 25 June - 29 June 2018, (AIAA 2018-3472)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-560-9}, language = {en} } @misc{KislerSarradj, author = {Kisler, Roman and Sarradj, Ennes}, title = {Plate Silencers for Broadband Low Frequency Sound Attenuation}, series = {Acta Acustica united with Acustica}, volume = {104}, journal = {Acta Acustica united with Acustica}, number = {3}, issn = {1610-1928}, pages = {521 -- 527}, abstract = {An efficiency improvement for the implementation of a semi-analytical model of plate silencers in ducts is presented in this work. It is shown that a high approximation quality can be maintained even if the computation effort is reduced significantly. Thus, preliminary designs of plate silencers for specific purposes can be conducted with little effort. In addition, the accelerated implementation is utilized to perform an extensive parameter variation in order to find a best case configuration of silen properties and corresponding design rules. The results of these studies show that a tuning of plate and geometry parameters allow for substantial increases in a silencer's attenuation performance.}, language = {en} }