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75 results on '"Siller, Henri"'

20. ANALYSIS OF THE JET NOISE EMITTED BY AN AIRCRAFT DURING TAKE-OFF

Author

Siller, Henri, Schumacher, Timo, and Hage, Wolfram

Subjects
Source localisation, Triebwerksakustik, acoustic beamforming, aircraft noise, jet noise
Abstract

Microphone array measurements with the DLR research aircraft ATRA flying in different configurations are presented with a focus on the analysis of sources in the engine jets. The free jets exiting the engine nozzles are large distributed source regions with locally and temporally fluctuating source distributions that evolve in the downstream direction. The source maps from the array data calculated with a deconvolution method for moving sources are divided into integration regions for the different noise sources of the engine and the free jet downstream. Frequency spectra of the integrated noise powers from the source regions of the engine inlets, the nozzles, and the jets for fly-overs in three different configurations with high engine speeds are presented and compared.

Published
2020

21. Common numerical methods & common experimental means for the demonstrators of the large passenger aircraft platforms

Author

Krüger, Wolf R., Boden, Fritz, Kirmse, Tania, Lemarechal, Jonathan, Schröder, Andreas, Barth, Hans Peter, Oertwig, Sebastian, Siller, Henri, Delfs, Jan Werner, Moreau, Antoine, Schäfer, Dominik, Stürmer, Arne, and Norambuena, Marco

Subjects
Hochgeschwindigkeitskonfigurationen, GO, deformation measurements, Triebwerksakustik, aeroacoustic calculations and measurements, ComputerApplications_COMPUTERSINOTHERSYSTEMS, crossflow instability, Aeroelastische Simulation, TSP, vibroacoustics, aeroelastic stability, active excitation control, Technische Akustik, numerical simulation methods, IPCT, Clean Sky, Lastanalyse und Entwurf, Experimentelle Verfahren, GO, Strukturdynamik und Systemidentifikation, parametric modelling, propulsion, Transportflugzeuge, Shake-the-Box
Abstract

The integration of advanced propulsion systems into the aircraft, and the assessment of their benefits related to e.g. fuel burn, noise emission and potential further measures, is one of the major activities of the Large Passenger Aircraft (LPA) Platform 1 of the Clean Sky 2 initiative. In order to optimize and assess the potential of advanced propulsion integration, it is necessary to establish suitable design, evaluation, and measurement tools. The so-called Cross-Demonstrator-Capabilities (XDC-) activities have been set up to develop and demonstrate powerful numerical and experimental methods for aerodynamic, aeroacoustics and aeroelastic simulation and measurement tasks, supporting the dedicated demonstrators of LPA. The paper will give an overview of the XDC activities and some examples of the developments related to this demonstrator.

Published
2020

23. A review of acoustic imaging methods using phased microphone arrays

Author

Merino-Martínez, Roberto, Sijtsma, Pieter, Snellen, Mirjam, Ahlefeldt, Thomas, Antoni, Jerome, Bahr, Christopher J., Blacodon, Daniel, Ernst, Daniel, Finez, Arthur, Funke, Stefan, Geyer, THomas F., Haxter, Stefan, Herold, Gert, Huang, Xun, Humphreys, WIllam M., Leclére, Quentin, Malgoezar, Anwar, Michel, Ulf, Padois, Thomas, Picard, Christophe, Sarradj, Ennes, Siller, Henri, Simons, Dick G., and Spehr, Carsten

Subjects
Phased microphone arrays, Acoustic imaging, Beamforming, Deconvolution, Aeroacoustic measurements
Published
2019
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31. Correlation analysis between the jet exhaust velocity field and microphone-array acoustic measurements for a turbo-fan engine

Author

Bassetti, Alessandro, Berkefeld, Tobias, Schröder, Andreas, Siller, Henri, and Wrede, Björn

Subjects
PIV, Acoustic Analogy, Jet Noise, Triebwerksakustik, Microphone Array, Experimentelle Verfahren, Causality Correlation
Abstract

Simultaneous flow and acoustic measurements have been acquired for an aircraft, during ground operation. Measurements of velocity field data with stereoscopic particle image velocimetry (SPIV) on the engine-exhaust jet are correlated with the acoustic-pressure signals of a 120 microphone linear array. The turbulent velocity and the applied-stress components of the Lighthill- and Lilley-analogy source terms in the SPIV region are correlated with the microphone array. Convection effects on the propagating sound waves are neglected in the present study. The self-noise term in the Lighthill quadrupole, shows a hot spot for the correlation in the by-pass to ambient shear layer. This high correlation region is clearly visible in one of the analysed test points only, while in general a poor statistical convergence seems to affect the test-source correlation.

Published
2016

36. JExTRA – Jet Noise Experiments at AT-TRA

Author

Nussbaumer, Max and Siller, Henri A.

Subjects
Jet-Noise, Triebwerksakustik
Abstract

This report by Max Nussbaumer is the result of his summer internship from 1. July 2015 to 11. September 2015 at DLR engine acoustics in Berlin. Under the supervision of Henri Siller, he performed acoustic measurements with a microphone array in the JExTRA jet facility. The jet facility was provided by Robert Meyer, the anechoic set-up of the microphone array has been conceived and constructed by Alessandro Bassetti with the support of Wolfram Hage and Larisa Hritsevskyy, who together with Stefan Funke supported the experiments. Stefan Funke also consulted Max Nussbaumer during the data reduction. Karsten Liesner supported the operation of the jet facility and adapted the control software.

Published
2015

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