@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} } @misc{MoreauGeyerDoolanetal., author = {Moreau, Danielle J. and Geyer, Thomas and Doolan, Con and Sarradj, Ennes}, title = {Surface curvature effects on the tonal noise of a wall-mounted finite airfoil}, series = {The Journal of the Acoustical Society of America}, volume = {143}, journal = {The Journal of the Acoustical Society of America}, number = {6}, issn = {1520-8524}, doi = {10.1121/1.5040981}, pages = {3460 -- 3473}, abstract = {This paper is concerned with the influence of camber on the noise of a wall-mounted finite airfoil with natural boundary layer transition. Tonal noise measurements taken in an aeroacoustic wind tunnel are presented for airfoils with aspect ratio of 2, NACAxx12 profile and camber between 0 and 6\% at 40\% chord. The results show camber is an important parameter that determines the operating conditions for which acoustic tone generation occurs and the number and intensity of the tones produced. Airfoils with 0\%-2\% camber have an acoustic signature that is dominated by a high amplitude primary tone, whereas the spectra of airfoils with higher camber of 4\%-6\% feature a more pronounced side tone structure. Tonal noise production does not collapse with lift coefficient, demonstrating that the local flow conditions influence the noise source. Tonal noise production is explained in terms of changes to mean flow topology, namely the location of flow separation, which is linked to tonal noise generation. Scaling of airfoil tonal noise is found to vary with angle of attack and pressure gradient. Empirical scaling laws for the primary tone frequency dependence on velocity are also derived for the cambered airfoils.}, language = {en} } @inproceedings{KislerMaterneGeyeretal., author = {Kisler, Roman and Materne, Daniel and Geyer, Thomas and Sarradj, Ennes}, title = {Modularer Versuchsstand zur Charakterisierung von Plattenschalld{\"a}mpfern}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {441 -- 444}, language = {de} } @misc{CaldichourySouliSarradjetal., author = {{\c{C}}aldichoury, I{\~n}aki and Souli, Mhamed and Sarradj, Ennes and Geyer, Thomas and Del Pin, Facundo}, title = {Numerical investigation of flow around hairy flaps cylinder using FSI Capabilities}, series = {The International journal of multiphysics}, volume = {12}, journal = {The International journal of multiphysics}, number = {2}, issn = {2048-3961}, pages = {189 -- 208}, language = {en} } @misc{SharmaGeyerSarradjetal., author = {Sharma, Sparsh and Geyer, Thomas and Sarradj, Ennes and Schmidt, Heiko}, title = {Numerical investigation of noise generation by rod-airfoil configuration using DES (SU2) and the FW-H analogy}, series = {25th AIAA/CEAS Aeroacoustics Conference 2019, Delft, The Netherlands, 20 - 24 May 2019, (AIAA 2019-2400)}, journal = {25th AIAA/CEAS Aeroacoustics Conference 2019, Delft, The Netherlands, 20 - 24 May 2019, (AIAA 2019-2400)}, doi = {10.2514/6.2019-2400}, pages = {1 -- 17}, language = {en} } @misc{SharmaKleinSchmidtetal., author = {Sharma, Sparsh and Klein, Marten and Schmidt, Heiko and Sarradj, Ennes}, title = {On a lower-order framework for jet noise prediction based on one-dimensional turbulence}, series = {arXiv}, journal = {arXiv}, pages = {1 -- 4}, abstract = {Noise prediction requires the resolution of relevant acoustic sources on all scales of a turbulent flow. High-resolution direct numerical and large-eddy simulation would be ideal but both are usually too costly despite developments in high performance computing. Lower-order modeling approaches are therefore of general interest. A crucial but standing problem for accurate predictive modeling is the estimation of missing noise from the modeled scales. In this paper we address this problem by presenting a novel lower-order framework that couples the one-dimensional turbulence model to the Ffowcs-Williams and Hawkings approach for prediction of the far-field noise of a subsonic turbulent round jet.}, language = {en} } @misc{GeyerWindischFritzscheetal., author = {Geyer, Thomas and Windisch, Thomas and Fritzsche, Christoph and Sarradj, Ennes}, title = {Dataset on permeability of wings from owls and non-silently flying birds}, series = {Data in Brief}, volume = {52}, journal = {Data in Brief}, issn = {2352-3409}, doi = {10.1016/j.dib.2023.109825}, language = {en} } @misc{GeyerWindischFritzscheetal., author = {Geyer, Thomas and Windisch, Thomas and Fritzsche, Christoph and Sarradj, Ennes}, title = {Dataset on airflow resistance of wings from owls and non-silently flying birds}, doi = {10.17632/ndcndtstcf.1}, language = {en} } @inproceedings{SharmaGeyerSarradj, author = {Sharma, Sparsh and Geyer, Thomas and Sarradj, Ennes}, title = {Time Domain Boundary Element Method for the Leading-Edge Noise subjected to Linear Vorticity}, series = {INTER-NOISE 2018, the 47th International Congress and Exposition on Noise Control Engineering, Chicago, Illinois, USA}, booktitle = {INTER-NOISE 2018, the 47th International Congress and Exposition on Noise Control Engineering, Chicago, Illinois, USA}, pages = {10}, language = {en} } @inproceedings{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Noise reduction and aerodynamics of airfoils with porous trailing edges}, series = {INTER-NOISE 2018, the 47th International Congress and Exposition on Noise Control Engineering, Chicago, Illinois, USA}, booktitle = {INTER-NOISE 2018, the 47th International Congress and Exposition on Noise Control Engineering, Chicago, Illinois, USA}, pages = {10}, language = {en} } @inproceedings{SharmaSarradj, author = {Sharma, Sparsh and Sarradj, Ennes}, title = {Fluctuating inflow conditions for time-domain boundary element method for airfoil-turbulence interaction noise}, series = {Proceedings of the 15th International Symposium on Unsteady Aerodynamics, Aeroacoustics \& Aeroelasticity of Turbomachines ISUAAAT15, 24-27 September 2018, University of Oxford, UK}, booktitle = {Proceedings of the 15th International Symposium on Unsteady Aerodynamics, Aeroacoustics \& Aeroelasticity of Turbomachines ISUAAAT15, 24-27 September 2018, University of Oxford, UK}, publisher = {ISUAAAT Scientific Committee}, pages = {8}, language = {en} } @inproceedings{SharmaSarradjSchmidt, author = {Sharma, Sparsh and Sarradj, Ennes and Schmidt, Heiko}, title = {Low-Fidelity Stochastic Approach for Airfoil-Turbulence Interaction Noise}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {1184 -- 1187}, language = {en} } @inproceedings{SarradjHeroldGeyer, author = {Sarradj, Ennes and Herold, Gert and Geyer, Thomas}, title = {Vergleich verschiedener Mikrofonarray-Verfahren anhand synthetischer Daten}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {1391 -- 1394}, language = {de} } @inproceedings{HenkeNoackSarradj, author = {Henke, Anna-Sophia and Noack, Martin and Sarradj, Ennes}, title = {Untersuchung des Modalverhaltens strukturierter Bleche}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {469 -- 472}, language = {de} } @inproceedings{SchneehagenSarradjGeyer, author = {Schneehagen, Erik W. and Sarradj, Ennes and Geyer, Thomas}, title = {Numerische Simulation des Str{\"o}mungsger{\"a}usches eines wandb{\"u}ndigen Zylinders}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {1001 -- 1004}, language = {de} } @inproceedings{GeyerMoreauSarradjetal., author = {Geyer, Thomas and Moreau, Danielle J. and Sarradj, Ennes and Doolan, Con}, title = {Zur Schallentstehung an dreidimensionalen wandgebundenen Tragfl{\"u}gelprofilen}, series = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, booktitle = {Fortschritte der Akustik - DAGA 2018, 44. Jahrestagung f{\"u}r Akustik, 19.-22. M{\"a}rz 2018 in M{\"u}nchen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik}, address = {Berlin}, pages = {1587 -- 1590}, language = {de} } @misc{SchneehagenGeyerSarradj, author = {Schneehagen, Erik W. and Geyer, Thomas and Sarradj, Ennes}, title = {Reduzierung des Eigenger{\"a}uschs von Tragfl{\"u}geln durch Seitenplatten}, series = {Fortschritte der Akustik - DAGA, 48. Jahrestagung f{\"u}r Akustik}, journal = {Fortschritte der Akustik - DAGA, 48. Jahrestagung f{\"u}r Akustik}, language = {de} } @inproceedings{KislerSarradj, author = {Kisler, Roman and Sarradj, Ennes}, title = {Modellierung der Schalld{\"a}mpfung mehrschichtiger Plattenresonatoren in Str{\"o}mungskan{\"a}len}, series = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, booktitle = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (DEGA)}, address = {Berlin}, isbn = {978-3-939296-12-6}, pages = {1545 -- 1548}, language = {de} } @inproceedings{HallHeroldGeyeretal., author = {Hall, Philipp and Herold, Gert and Geyer, Thomas and Sarradj, Ennes}, title = {Vergleich verschiedener Methoden zur Schallleistungsbestimmung von Maschinenkomponenten}, series = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, booktitle = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (DEGA)}, address = {Berlin}, isbn = {978-3-939296-12-6}, pages = {564 -- 567}, language = {de} } @inproceedings{SchulzGeyerThuermeretal., author = {Schulz, Adrian and Geyer, Thomas and Th{\"u}rmer, Konrad and Sarradj, Ennes and Stapel, Jennifer}, title = {Beachtung der Schallemission wasserwirtschaftlicher Anlagen im urbanen Raum}, series = {Bemessung im Wasserbau, Klimaanpassung, Unersuchungen, Regeln, Planung, Ausf{\"u}hrung, 40. Dresdner Wasserbaukolloquium 2017, 09.-10. M{\"a}rz 2017}, booktitle = {Bemessung im Wasserbau, Klimaanpassung, Unersuchungen, Regeln, Planung, Ausf{\"u}hrung, 40. Dresdner Wasserbaukolloquium 2017, 09.-10. M{\"a}rz 2017}, publisher = {Selbstverlag der Technischen Universit{\"a}t Dresden}, address = {Dresden}, isbn = {978-3-86780-509-4}, pages = {201 -- 210}, language = {de} } @inproceedings{SharmaSarradjSchmidt, author = {Sharma, Sparsh and Sarradj, Ennes and Schmidt, Heiko}, title = {Unsteady Lift due to the Interaction of Incidence Turbulence with an Airfoil}, series = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, booktitle = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (DEGA)}, address = {Berlin}, isbn = {978-3-939296-12-6}, pages = {1489 -- 1490}, language = {en} } @inproceedings{GeyerSarradjWinkler, author = {Geyer, Thomas and Sarradj, Ennes and Winkler, Peggy}, title = {Messungen an einem Modell-Propellerpr{\"u}fstand}, series = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, booktitle = {Fortschritte der Akustik, 43. Deutsche Jahrestagung f{\"u}r Akus tik, 6.-9. M{\"a}rz 2017 in Kiel}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V. (DEGA)}, address = {Berlin}, isbn = {978-3-939296-12-6}, pages = {983 -- 986}, language = {de} } @inproceedings{GeyerSarradjHobracht, author = {Geyer, Thomas and Sarradj, Ennes and Hobracht, Marcus}, title = {Noise generated by a leading edge in anisotropic turbulence}, series = {45th International Congress and Exposition on Noise Control Engineering (Internoise 2016), Hamburg, Germany, 21-24 August 2016, vol. 8}, booktitle = {45th International Congress and Exposition on Noise Control Engineering (Internoise 2016), Hamburg, Germany, 21-24 August 2016, vol. 8}, editor = {Kropp, Wolfgang and Estorff, Otto von and Schulte-Fortkamp, Brigitte}, publisher = {Curran Associates}, address = {Red Hook, NY}, isbn = {978-1-5108-2988-6}, pages = {6067 -- 6078}, language = {en} } @inproceedings{SchulzeSarradjGeyer, author = {Schulze, Thomas and Sarradj, Ennes and Geyer, Thomas}, title = {Windger{\"a}uschreduktion am Ohr}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {de} } @inproceedings{SarradjMeiselbach, author = {Sarradj, Ennes and Meiselbach, Falko T.}, title = {Berechnung von Schalld{\"a}mpfern mit Platten- oder Membran-Auskleidung}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {de} } @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} } @inproceedings{Sarradj, author = {Sarradj, Ennes}, title = {A Generic Approach to Synthesize Optimal Array Microphone Arrangements}, 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 = {12}, language = {en} } @inproceedings{HeroldSarradj, author = {Herold, Gert and Sarradj, Ennes}, title = {Acoular - Open-Source-Software zur Anwendung von Mikrofonarrayverfahren}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {de} } @inproceedings{BrueckerKampsGeyeretal., author = {Br{\"u}cker, Christoph and Kamps, Laura and Geyer, Thomas and Sarradj, Ennes}, title = {Wake-Vortex Sound Attenuation using Attached Hairy Flaps}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {en} } @inproceedings{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Experimentelle Untersuchung der Minderung von Str{\"o}mungsschall durch por{\"o}se Zylinderummantelungen}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {de} } @inproceedings{HenkeSarradj, author = {Henke, Anna-Sophia and Sarradj, Ennes}, title = {Punktimpedanzen strukturierter Doppelbleche}, series = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, booktitle = {Fortschritte der Akustik, DAGA 2016, Aachen, 14.-17. M{\"a}rz 2016, 42. Jahrestagung f{\"u}r Akustik}, publisher = {DAGA}, address = {Berlin}, isbn = {978-3-939296-10-2}, language = {de} } @misc{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Aerodynamische Schallentstehung durchstr{\"o}mter Netze}, series = {Fortschritte der Akustik - DAGA, 48. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2022}, journal = {Fortschritte der Akustik - DAGA, 48. Jahrestagung f{\"u}r Akustik, 21. - 24. M{\"a}rz 2022}, pages = {109}, 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{GeyerFritzscheSarradjetal., author = {Geyer, Thomas and Fritzsche, Christoph and Sarradj, Ennes and Wagner, Hermann}, title = {Der leise Flug der Eule}, series = {Akustik Journal}, volume = {2021}, journal = {Akustik Journal}, number = {2}, pages = {9 -- 17}, 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} } @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} } @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{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{AntoshkivKruegerSarradjetal., author = {Antoshkiv, Oleksiy and Kr{\"u}ger, Falko and Sarradj, Ennes and Berg, Heinz Peter}, title = {Acoustical Diagnostic of Spray-Airflow Interaction in a Modern Aero Engine Combustor Chamber}, series = {Deutscher Luft- und Raumfahrtkongress 2009, Bd. Manuskripte}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2009, Bd. Manuskripte}, publisher = {DGLR}, address = {Bonn}, isbn = {978-3-932182-64-8}, 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} } @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{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{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} } @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} } @misc{HenkeTepeSarradj, author = {Henke, Anna-Sophia and Tepe, Ali and Sarradj, Ennes}, title = {Untersuchung des Abstrahlverhaltens strukturierter Bleche}, series = {Fortschritte der Akustik - DAGA 2019, 45. Jahrestagung f{\"u}r Akustik, 18.-21. M{\"a}rz 2019 in Rostock}, journal = {Fortschritte der Akustik - DAGA 2019, 45. Jahrestagung f{\"u}r Akustik, 18.-21. M{\"a}rz 2019 in Rostock}, abstract = {Stahlbleche sind auf Grund ihrer einfachen Fertigung und vielf{\"a}ltigen Anwendungsm{\"o}glichkeiten unentbehrlich in Bereichen wie dem Maschinen- und Fahrzeugbau oder der Architektur. Durch das Einbringen von Strukturen kann die Steifigkeit von Stahlplatten erh{\"o}ht werden. So kann bei einem geringeren Materialeinsatz gleichbleibenden statischen Anspr{\"u}chen gen{\"u}gt werden. Eine derartige Umformung f{\"u}hrt jedoch auch zu einem ver{\"a}nderten akustischen Verhalten von strukturierten Blechen gegen{\"u}ber glatten Blechen. Im Rahmen einer Studie an der BTU Cottbus-Senftenberg zum akustischen Verhalten hexagonal wabenstrukturierter Stahlbleche wurde das Abstrahlverhalten dieser Bleche untersucht. Dazu wurden im Fensterpr{\"u}fstand der TU Berlin experimentell die abgestrahlte Schallleistung sowie die Schwingschnelle von mit einem Shaker angeregten Blechen ermittelt. Aus den so gewonnenen Daten wurde das Abstrahlmaß berechnet. Der Beitrag zeigt das Verfahren und veranschaulicht die Ergebnisse vergleichend f{\"u}r glatte und hexagonal strukturierte Bleche. Dabei wird im Besonderen auf den Einfluss der Strukturierung auf das Abstrahlmaß der Stahlbleche eingegangen.}, 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} } @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{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} } @misc{MerinoMartinezSijtsmaSnellenetal., author = {Merino-Martinez, Roberto and Sijtsma, Pieter and Snellen, Mirjam and Ahlefeldt, Thomas and Antoni, Jerome and Bahr, Christopher and Blacodon, Daniel and Ernst, Daniel and Finez, Arthur and Funke, Stefan and Geyer, Thomas and Haxter, Stefan and Herold, Gert and Huang, Xun and Humphreys, William and Lecl{\`e}re, Quentin and Malgoezar, Anwar and Michel, Ulf and Padois, Thomas and Pereira, Antonio and Picard, Christophe and Sarradj, Ennes and Siller, Henri and Simons, Dick and Spehr, Carsten}, title = {A review of acoustic imaging methods using phased microphone arrays}, series = {CEAS Aeronautical Journal}, volume = {10}, journal = {CEAS Aeronautical Journal}, number = {1}, issn = {1869-5582}, doi = {10.1007/s13272-019-00383-4}, pages = {197 -- 230}, abstract = {Phased microphone arrays have become a well-established tool for performing aeroacoustic measurements in wind tunnels (both open-jet and closed-section), flying aircraft, and engine test beds. This paper provides a review of the most well-known and state-of-the-art acoustic imaging methods and recommendations on when to use them. Several exemplary results showing the performance of most methods in aeroacoustic applications are included. This manuscript provides a general introduction to aeroacoustic measurements for non-experienced microphone-array users as well as a broad overview for general aeroacoustic experts.}, language = {en} } @misc{NeubauerGensslerRadmannetal., author = {Neubauer, Moritz and Genßler, Julia and Radmann, Vincent and Kohlenberg, Fleming and Pohl, Michael and B{\"o}hme, Kurt and Knobloch, Karsten and Sarradj, Ennes and H{\"o}schler, Klaus and Modler, Niels and Enghardt, Lars}, title = {Experimental and Numerical Investigation of Novel Acoustic Liners and Their Design for Aero-Engine Applications}, series = {Aerospace}, volume = {10}, journal = {Aerospace}, number = {1}, issn = {2226-4310}, doi = {10.3390/aerospace10010005}, abstract = {This paper presents a combined experimental and numerical investigation on a novel liner concept for enhanced low-frequency and broadband acoustic attenuation. In particular, two different realizations, derived from conventional Helmholtz resonators (HR) and plate resonators (PR) are investigated, which both deploy flexible materials with material inherent damping. In this context, a comprehensive experimental investigation was carried out focusing the identification and evaluation of various geometric parameters and material properties on the acoustics dissipation and related properties of various materials in a simplified setup of a single Helmholtz resonator with flexible walls (FHR concept). Furthermore, a parameter study based on analytical models was performed for both liner concepts, taking into account material as well as geometric parameters and their effects on transmission loss. In addition, design concepts that enable cylindrical or otherwise curved liner structures and the corresponding manufacturing technologies are presented, while considering essential structural features such as drainage. With respect to the potential application in jet engines, a structural-mechanical analysis considering the relevant load cases to compare and discuss the mechanical performance of a classical HR and the FHR concept liner is presented. Finally, both concepts are evaluated and possible challenges and potentials for further implementation are described.}, language = {en} }