Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Thomas Ahlefeldt"'
Publikováno v:
Micromachines, Vol 12, Iss 8, p 961 (2021)
Preparing and pre-testing experimental setups for flight tests is a lengthy but necessary task. One part of this preparation is comparing newly available measurement technology with proven setups. In our case, we wanted to compare acoustic Micro-Elec
Externí odkaz:
https://doaj.org/article/0b8d05c376ad484ebd96c85dc9d3c93b
Autor:
Thomas Ahlefeldt, Alessandro Di Marco, Lorenzo Burghignoli, Francesco Centracchio, Stephan Adden, Arne Henning, Massimiliano Di Giulio, Roberto Camussi
Publikováno v:
CEAS Aeronautical Journal. 11:849-872
The aeroacoustics of laminar wings and the noise abatement provided by flap-tip fences are studied experimentally on a scaled model installed in the closed test section of a subsonic wind tunnel. The activity has been developed under an international
Autor:
Thomas Ahlefeldt
Publikováno v:
AIAA Journal. 55:36-48
This paper presents an experimental investigation of small-scale model airframe noise at various Reynolds numbers up to the real-flight case. The study consists of data acquired with a microphone array in the European Transonic Windtunnel (ETW). The
Publikováno v:
Scopus-Elsevier
Aircraft cabin noise measurements in flight are used to identify the noise sources and entry points of acoustic energy into the cabin and to quantify the respective noise levels. The aim of an ongoing project of the partners GfaI and DLR is to develo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::2d960744164fe54cb49305187e720db8
https://elib.dlr.de/127997/
https://elib.dlr.de/127997/
Autor:
Thomas Ahlefeldt, Carsten Spehr
Aeroacoustic measurements in wind tunnels are a common tool in the determination of sound sources on scaled models. Measurements are performed worldwide in comparable wind tunnels. It is however not known to what degree a similar measurement in diffe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d35e37b4597e019f0b61a5bacebe00fc
https://doi.org/10.1007/s13272-019-00386-1
https://doi.org/10.1007/s13272-019-00386-1
Autor:
Daniel Ernst, A. Pereira, A.M.N. Malgoezar, D. Blacodon, Thomas Padois, A. Finez, Pieter Sijtsma, Gert Herold, Stefan Haxter, Dick G. Simons, Xun Huang, Carsten Spehr, Henri Siller, Thomas Ahlefeldt, Ulf Michel, Christophe Picard, Quentin Leclere, Christopher J. Bahr, Mirjam Snellen, Jérôme Antoni, Ennes Sarradj, Roberto Merino-Martínez, Thomas F. Geyer, William M. Humphreys, S. Funke
Publikováno v:
CEAS Aeronautical Journal, 10(1)
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 s
Autor:
Thomas Ahlefeldt, Roberto Camussi, Arne Henning, Jürg Müller, Lorenzo Burghignoli, Alessandro Di Marco, Francesco Centracchio
The airframe noise of a 1:2 scaled aircraft model is investigated through a series of experiments in the hard walled closed test section of a large non-anechoic wind tunnel. A surface mounted phased microphone array is used to acquire the wall pressu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e67871c4c3017368e9e9954ee16a502
https://elib.dlr.de/126997/
https://elib.dlr.de/126997/
Publikováno v:
Experimental Thermal and Fluid Science. 112:109915
Fast response Pressure-Sensitive Paint (iPSP) developed at the German Aerospace Center (DLR) in Gottingen is evaluated for measurements of acoustic pressure distributions. A test facility is constructed, which allows to measure these acoustic pressur
Aeroacoustic measurements in wind tunnels are a common tool in the determination of sound sources on scaled models. Most of the algorithms used are based on the assumption that the unknown aeroacoustic sources radiate sound waves omnidirectionally, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b5f6f375e65584aec896dd823f443fd
https://elib.dlr.de/119063/
https://elib.dlr.de/119063/
Autor:
Daniel Ernst, Thomas Ahlefeldt, Christophe Picard, Con J. Doolan, Antonio Pereira, Carsten Spehr, Christopher J. Bahr, Danielle J. Moreau, Ric Porteous, Quentin Leclere, William M. Humphreys, Jeoffrey Fischer
Publikováno v:
AIAA
AIAA, Jun 2017, Denver, United States. ⟨10.2514/6.2015-2206⟩
Scopus-Elsevier
AIAA, Jun 2017, Denver, United States. ⟨10.2514/6.2015-2206⟩
Scopus-Elsevier
International audience; In this work, various microphone phased array data processing techniques are applied to two existing datasets from aeroacoustic wind tunnel tests. The first of these is from a large closed-wall facility, DLR's Kryo-Kanal Köln
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbb1d7fdabf48b4615d83a23e478395b
https://hal.archives-ouvertes.fr/hal-01595856
https://hal.archives-ouvertes.fr/hal-01595856