@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} } @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} } @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} } @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{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} } @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} } @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{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} } @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{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{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} } @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} } @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{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{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{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{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} } @misc{GeyerKampsSarradjetal., author = {Geyer, Thomas and Kamps, Laura and Sarradj, Ennes and Br{\"u}cker, Christoph}, title = {Passive Control of the Vortex Shedding Noise of a Cylinder at Low Reynolds Numbers Using Flexible Flaps}, series = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3015)}, journal = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3015)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-504-3}, language = {en} } @misc{MoreauGeyerDoolanetal., author = {Moreau, Danielle J. and Geyer, Thomas and Doolan, Con and Sarradj, Ennes}, title = {Camber Effects on the Tonal Noise and Flow Characteristics of a Wall-mounted Finite Airfoil}, series = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3172)}, journal = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3172)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-504-3}, language = {en} } @misc{KampsBrueckerGeyeretal., author = {Kamps, Laura and Br{\"u}cker, Christoph and Geyer, Thomas and Sarradj, Ennes}, title = {Airfoil Self Noise Reduction at Low Reynolds Numbers Using a Passive Flexible Trailing Edge}, series = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3496)}, journal = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3496)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-504-3}, language = {en} } @misc{SarradjHeroldSijtsmaetal., author = {Sarradj, Ennes and Herold, Gert and Sijtsma, Pieter and Merino-Martinez, Roberto and Geyer, Thomas and Bahr, Christopher and Porteous, Ric and Moreau, Danielle J. and Doolan, Con}, title = {A Microphone Array Method Benchmarking Exercise using Synthesized Input Data}, series = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3719)}, journal = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-3719)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-504-3}, language = {en} } @misc{HeroldGeyerSarradj, author = {Herold, Gert and Geyer, Thomas and Sarradj, Ennes}, title = {Comparison of Inverse Deconvolution Algorithms for High-resolution Aeroacoustic Source Characterization}, series = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-4177)}, journal = {23rd AIAA/CEAS Aeroacoustics Conference 2017, Denver, USA, 5 June - 9 June 2017, (AIAA 2017-4177)}, publisher = {AIAA}, address = {Reston, Va}, isbn = {978-1-62410-504-3}, 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{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} } @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{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} } @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} } @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} } @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{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{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} } @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{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} } @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} } @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{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} } @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{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{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} } @misc{GeyerLuciusSchroedteretal., author = {Geyer, Thomas and Lucius, Andreas and Schr{\"o}dter, Marcus and Schneider, Marc and Sarradj, Ennes}, title = {Reduction of Turbulence Interaction Noise Through Airfoils With Perforated Leading Edges}, series = {Acta Acustica united with Acustica}, volume = {105}, journal = {Acta Acustica united with Acustica}, number = {1}, issn = {1610-1928}, doi = {10.3813/AAA.919292}, pages = {109 -- 122}, language = {en} } @misc{GeyerKampsSarradjetal., author = {Geyer, Thomas and Kamps, Laura and Sarradj, Ennes and Br{\"u}cker, Christoph}, title = {Vortex Shedding and Modal Behavior of a Circular Cylinder Equipped with Flexible Flaps}, series = {Acta Acustica united with Acustica}, volume = {105}, journal = {Acta Acustica united with Acustica}, number = {1}, issn = {1610-1928}, doi = {10.3813/aaa.919301}, pages = {210 -- 219}, language = {en} } @misc{SharmaSarradj, author = {Sharma, Sparsh and Sarradj, Ennes}, title = {Two-dimensional isotropic turbulent inflow conditions for vortex particle method}, series = {Physical Review Fluids}, volume = {4}, journal = {Physical Review Fluids}, number = {2}, issn = {2469-990X}, doi = {10.1103/PhysRevFluids.4.022701}, pages = {11}, language = {en} } @misc{HenkeNoackGeyeretal., author = {Henke, Anna-Sophia and Noack, Martin and Geyer, Thomas and Heinrich, Christoph Rocky and Beirow, Bernd and Sarradj, Ennes and K{\"u}hhorn, Arnold}, title = {Calculation of the Modal Behavior of Structured Sheet Metal}, series = {International Journal of Lightweight Materials and Manufacture}, journal = {International Journal of Lightweight Materials and Manufacture}, issn = {2588-8404}, doi = {10.1016/j.ijlmm.2019.01.004}, pages = {13}, language = {en} } @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} } @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{GeyerSarradj, author = {Geyer, Thomas and Sarradj, Ennes}, title = {Self Noise Reduction and Aerodynamics of Airfoils With Porous Trailing Edges}, series = {Acoustics}, volume = {1}, journal = {Acoustics}, number = {2}, issn = {2624-599X}, doi = {10.3390/acoustics1020022}, pages = {393 -- 409}, 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} } @incollection{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 = {Fluid-Structure-Sound Interactions and Control Proceedings of the 4th Symposium on Fluid-Structure-Sound Interactions and Control}, booktitle = {Fluid-Structure-Sound Interactions and Control Proceedings of the 4th Symposium on Fluid-Structure-Sound Interactions and Control}, editor = {Zhou, Yu and Kimura, Motoaki and Peng, Guoyi and Lucey, A. D. and Huang, Lixi}, publisher = {Springer}, address = {Singapore}, isbn = {978-981-10-7541-4}, doi = {10.1007/978-981-10-7542-1_51}, pages = {337 -- 342}, language = {en} } @misc{GeyerWasalaSarradj, author = {Geyer, Thomas and Wasala, Sahan and Sarradj, Ennes}, title = {Experimental Study of Airfoil Leading Edge Combs for Turbulence Interaction Noise Reduction}, series = {Acoustics}, volume = {2}, journal = {Acoustics}, number = {2}, issn = {2624-599X}, doi = {10.3390/acoustics2020014}, pages = {207 -- 223}, language = {en} } @misc{SharmaSarradjSchmidt, author = {Sharma, Sparsh and Sarradj, Ennes and Schmidt, Heiko}, title = {Stochastic modelling of leading-edge noise in time-domain using vortex particles}, series = {Journal of Sound and Vibration}, volume = {Vol. 488}, journal = {Journal of Sound and Vibration}, issn = {0022-460X}, doi = {10.1016/j.jsv.2020.115656}, pages = {30}, language = {en} } @misc{AytonColbrookGeyeretal., author = {Ayton, Lorna and Colbrook, Matthew and Geyer, Thomas and Chaitanya, Paruchuri and Sarradj, Ennes}, title = {Reducing aerofoil-turbulence interaction noise through chordwise-varying porosity}, series = {Journal of Fluid Mechanics}, volume = {906}, journal = {Journal of Fluid Mechanics}, issn = {1469-7645}, doi = {10.1017/jfm.2020.746}, pages = {A1 -- A28}, 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{SchneehagenGeyerSarradjetal., author = {Schneehagen, Erik W. and Geyer, Thomas and Sarradj, Ennes and Moreau, Danielle J.}, title = {Aeroacoustic noise reduction by application of end plates on wall‑mounted finite airfoils}, series = {Experiments in Fluids}, volume = {62}, journal = {Experiments in Fluids}, number = {5}, issn = {0723-4864}, doi = {10.1007/s00348-021-03204-9}, 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} } @misc{AytonColbrookGeyeretal., author = {Ayton, Lorna and Colbrook, Matthew and Geyer, Thomas and Chaitanya, Paruchuri and Sarradj, Ennes}, title = {Modelling chordwise-varying porosity to reduce aerofoil-turbulence interaction noise}, series = {27th AIAA/CEAS Aeroacoustics Conference 2021, Virtual Event, August 2 - 6 2021}, journal = {27th AIAA/CEAS Aeroacoustics Conference 2021, Virtual Event, August 2 - 6 2021}, doi = {10.2514/6.2021-2190}, language = {en} } @misc{SharmaGeyerSarradjetal., author = {Sharma, Sparsh and Geyer, Thomas and Sarradj, Ennes and Schmidt, Heiko}, title = {Experimental validation of a lower-order model for leading-edge noise based on vortex method}, series = {27th AIAA/CEAS Aeroacoustics Conference 2021, Virtual Event, August 2 - 6 2021}, journal = {27th AIAA/CEAS Aeroacoustics Conference 2021, Virtual Event, August 2 - 6 2021}, doi = {10.2514/6.2021-2250}, language = {en} } @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} } @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} } @misc{SchneehagenGeyerSarradj, author = {Schneehagen, Erik W. and Geyer, Thomas and Sarradj, Ennes}, title = {Influence of end plate placement on the reduction of airfoil tip vortex formation noise}, series = {Acta Acustica}, volume = {6}, journal = {Acta Acustica}, issn = {2681-4617}, doi = {10.1051/aacus/2022053}, pages = {1 -- 14}, 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} } @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} }